use std::{
    collections::HashMap,
    error::Error,
    fmt, fs,
    path::{Path, PathBuf},
    sync::{Arc, Mutex},
};

use platform_auth::{
    SmsAuthProvider, SmsProviderError, SmsSendCodeRequest, SmsVerifyCodeRequest, hash_password,
    verify_password,
};
use serde::{Deserialize, Serialize};
use shared_kernel::{
    build_prefixed_uuid_id, format_rfc3339 as format_shared_rfc3339, new_uuid_simple_string,
    normalize_optional_string, normalize_required_string, parse_rfc3339,
};
use time::{Duration, OffsetDateTime};
use tracing::{info, warn};

const PASSWORD_MIN_LENGTH: usize = 6;
const PASSWORD_MAX_LENGTH: usize = 128;
const SMS_CODE_LENGTH: usize = 6;
const SMS_CODE_TTL_MINUTES: i64 = 5;
const SMS_CODE_COOLDOWN_SECONDS: u64 = 60;
const SMS_CODE_MAX_FAILED_ATTEMPTS: u32 = 5;

#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
pub enum AuthLoginMethod {
    Password,
    Phone,
    Wechat,
}

#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
pub enum AuthBindingStatus {
    Active,
    PendingBindPhone,
}

#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
pub struct AuthUser {
    pub id: String,
    pub public_user_code: String,
    pub username: String,
    pub display_name: String,
    pub phone_number_masked: Option<String>,
    pub login_method: AuthLoginMethod,
    pub binding_status: AuthBindingStatus,
    pub wechat_bound: bool,
    pub token_version: u64,
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub struct AuthMeResult {
    pub user: AuthUser,
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub struct PublicUserSearchResult {
    pub user: AuthUser,
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub struct PasswordEntryInput {
    pub phone_number: String,
    pub password: String,
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub struct PasswordEntryResult {
    pub user: AuthUser,
    pub created: bool,
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub struct ChangePasswordInput {
    pub user_id: String,
    pub current_password: Option<String>,
    pub new_password: String,
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub struct ChangePasswordResult {
    pub user: AuthUser,
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub struct ResetPasswordInput {
    pub phone_number: String,
    pub verify_code: String,
    pub new_password: String,
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub struct ResetPasswordResult {
    pub user: AuthUser,
    pub provider: String,
    pub provider_out_id: Option<String>,
    pub phone_number_masked: String,
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub enum PhoneAuthScene {
    Login,
    BindPhone,
    ChangePhone,
    ResetPassword,
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub struct PhoneNumberSnapshot {
    pub e164: String,
    pub masked_national_number: String,
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub struct SendPhoneCodeInput {
    pub phone_number: String,
    pub scene: PhoneAuthScene,
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub struct SendPhoneCodeResult {
    pub cooldown_seconds: u64,
    pub expires_in_seconds: u64,
    pub provider_request_id: Option<String>,
    pub provider_out_id: Option<String>,
    pub provider: String,
    pub scene: String,
    pub phone_number_masked: String,
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub struct PhoneLoginInput {
    pub phone_number: String,
    pub verify_code: String,
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub struct PhoneLoginResult {
    pub user: AuthUser,
    pub created: bool,
    pub provider: String,
    pub provider_out_id: Option<String>,
    pub phone_number_masked: String,
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub struct WechatIdentityProfile {
    pub provider_uid: String,
    pub provider_union_id: Option<String>,
    pub display_name: Option<String>,
    pub avatar_url: Option<String>,
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub struct ResolveWechatLoginInput {
    pub profile: WechatIdentityProfile,
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub struct ResolveWechatLoginResult {
    pub user: AuthUser,
    pub created: bool,
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub enum WechatAuthScene {
    Desktop,
    WechatInApp,
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub struct CreateWechatAuthStateInput {
    pub redirect_path: String,
    pub scene: WechatAuthScene,
    pub request_user_agent: Option<String>,
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub struct WechatAuthStateRecord {
    pub wechat_state_id: String,
    pub state_token: String,
    pub redirect_path: String,
    pub scene: WechatAuthScene,
    pub request_user_agent: Option<String>,
    pub expires_at: String,
    pub consumed_at: Option<String>,
    pub created_at: String,
    pub updated_at: String,
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub struct CreateWechatAuthStateResult {
    pub state: WechatAuthStateRecord,
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub struct ConsumeWechatAuthStateResult {
    pub state: WechatAuthStateRecord,
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub struct BindWechatPhoneInput {
    pub user_id: String,
    pub phone_number: String,
    pub verify_code: String,
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub struct BindWechatPhoneResult {
    pub user: AuthUser,
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub struct CreateRefreshSessionInput {
    pub user_id: String,
    pub refresh_token_hash: String,
    pub issued_by_provider: AuthLoginMethod,
    pub client_info: RefreshSessionClientInfo,
}

#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
pub struct RefreshSessionClientInfo {
    pub client_type: String,
    pub client_runtime: String,
    pub client_platform: String,
    pub client_instance_id: Option<String>,
    pub device_fingerprint: Option<String>,
    pub device_display_name: String,
    pub mini_program_app_id: Option<String>,
    pub mini_program_env: Option<String>,
    pub user_agent: Option<String>,
    pub ip: Option<String>,
}

#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
pub struct RefreshSessionRecord {
    pub session_id: String,
    pub user_id: String,
    pub refresh_token_hash: String,
    pub issued_by_provider: AuthLoginMethod,
    pub client_info: RefreshSessionClientInfo,
    pub expires_at: String,
    pub revoked_at: Option<String>,
    pub created_at: String,
    pub updated_at: String,
    pub last_seen_at: String,
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub struct CreateRefreshSessionResult {
    pub session: RefreshSessionRecord,
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub struct RotateRefreshSessionInput {
    pub refresh_token_hash: String,
    pub next_refresh_token_hash: String,
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub struct RotateRefreshSessionResult {
    pub session: RefreshSessionRecord,
    pub user: AuthUser,
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub struct ListActiveRefreshSessionsResult {
    pub sessions: Vec<RefreshSessionRecord>,
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub struct LogoutCurrentSessionInput {
    pub user_id: String,
    pub refresh_token_hash: Option<String>,
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub struct LogoutCurrentSessionResult {
    pub user: AuthUser,
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub struct LogoutAllSessionsInput {
    pub user_id: String,
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub struct LogoutAllSessionsResult {
    pub user: AuthUser,
}

#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
pub struct AuthStoreSnapshotRecord {
    pub snapshot_json: Option<String>,
    pub updated_at_micros: Option<i64>,
}

#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
pub struct AuthStoreSnapshotUpsertInput {
    pub snapshot_json: String,
    pub updated_at_micros: i64,
}

#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
pub struct AuthStoreSnapshotProcedureResult {
    pub ok: bool,
    pub record: Option<AuthStoreSnapshotRecord>,
    pub error_message: Option<String>,
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub enum PasswordEntryError {
    InvalidPhoneNumber,
    InvalidPasswordLength,
    InvalidPublicUserCode,
    InvalidCredentials,
    UserNotFound,
    Store(String),
    PasswordHash(String),
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub enum PhoneAuthError {
    InvalidPhoneNumber,
    InvalidVerifyCode,
    VerifyCodeNotFound,
    VerifyCodeExpired,
    SendCoolingDown { retry_after_seconds: u64 },
    VerifyAttemptsExceeded,
    UserNotFound,
    UserStateMismatch,
    Store(String),
    PasswordHash(String),
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub enum WechatAuthError {
    MissingProfile,
    StateNotFound,
    StateExpired,
    StateConsumed,
    UserNotFound,
    MissingWechatIdentity,
    Store(String),
    PasswordHash(String),
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub enum RefreshSessionError {
    MissingToken,
    SessionNotFound,
    SessionExpired,
    UserNotFound,
    Store(String),
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub enum LogoutError {
    UserNotFound,
    Store(String),
}

#[derive(Clone, Debug)]
pub struct InMemoryAuthStore {
    inner: Arc<Mutex<InMemoryAuthStoreState>>,
    persistence_path: Option<Arc<PathBuf>>,
}

#[derive(Debug)]
struct InMemoryAuthStoreState {
    next_user_id: u64,
    users_by_username: HashMap<String, StoredPasswordUser>,
    phone_to_user_id: HashMap<String, String>,
    sessions_by_id: HashMap<String, StoredRefreshSession>,
    session_id_by_refresh_token_hash: HashMap<String, String>,
    phone_codes_by_key: HashMap<String, StoredPhoneCode>,
    wechat_states_by_token: HashMap<String, StoredWechatAuthState>,
    wechat_identity_by_provider_uid: HashMap<String, StoredWechatIdentity>,
    user_id_by_provider_union_id: HashMap<String, String>,
}

#[derive(Debug, Serialize, Deserialize)]
struct PersistentAuthStoreSnapshot {
    next_user_id: u64,
    users_by_username: HashMap<String, StoredPasswordUser>,
    phone_to_user_id: HashMap<String, String>,
    sessions_by_id: HashMap<String, StoredRefreshSession>,
    session_id_by_refresh_token_hash: HashMap<String, String>,
    wechat_identity_by_provider_uid: HashMap<String, StoredWechatIdentity>,
    user_id_by_provider_union_id: HashMap<String, String>,
}

#[derive(Clone, Debug, Serialize, Deserialize)]
struct StoredPasswordUser {
    user: AuthUser,
    password_hash: String,
    #[serde(default)]
    password_login_enabled: bool,
    phone_number: Option<String>,
}

#[derive(Clone, Debug, Serialize, Deserialize)]
struct StoredRefreshSession {
    session: RefreshSessionRecord,
}

#[derive(Clone, Debug)]
struct StoredPhoneCode {
    phone_number: String,
    scene: PhoneAuthScene,
    expires_at: String,
    last_sent_at: String,
    failed_attempts: u32,
    provider_out_id: Option<String>,
}

#[derive(Clone, Debug)]
struct StoredWechatAuthState {
    state: WechatAuthStateRecord,
}

#[derive(Clone, Debug, Serialize, Deserialize)]
struct StoredWechatIdentity {
    user_id: String,
    provider_uid: String,
    provider_union_id: Option<String>,
    display_name: Option<String>,
    avatar_url: Option<String>,
}

#[derive(Clone, Debug)]
pub struct PasswordEntryService {
    store: InMemoryAuthStore,
}

#[derive(Clone, Debug)]
pub struct RefreshSessionService {
    store: InMemoryAuthStore,
    refresh_session_ttl_days: u32,
}

#[derive(Clone, Debug)]
pub struct AuthUserService {
    store: InMemoryAuthStore,
}

#[derive(Clone, Debug)]
pub struct PhoneAuthService {
    store: InMemoryAuthStore,
    sms_provider: SmsAuthProvider,
}

#[derive(Clone, Debug)]
pub struct WechatAuthStateService {
    store: InMemoryAuthStore,
    state_ttl_minutes: u32,
}

#[derive(Clone, Debug)]
pub struct WechatAuthService {
    store: InMemoryAuthStore,
}

impl PasswordEntryService {
    pub fn new(store: InMemoryAuthStore) -> Self {
        Self { store }
    }

    pub async fn execute(
        &self,
        input: PasswordEntryInput,
    ) -> Result<PasswordEntryResult, PasswordEntryError> {
        validate_password(&input.password)?;
        let normalized_phone = normalize_mainland_china_phone_number(&input.phone_number)
            .map_err(|_| PasswordEntryError::InvalidPhoneNumber)?;
        let Some(existing_user) = self
            .store
            .find_by_phone_number_for_password(&normalized_phone.e164)?
        else {
            return Err(PasswordEntryError::InvalidCredentials);
        };

        verify_stored_password_user(existing_user, &input.password).await
    }

    pub fn get_user_by_id(
        &self,
        user_id: &str,
    ) -> Result<Option<AuthMeResult>, PasswordEntryError> {
        self.store
            .find_by_user_id(user_id)
            .map(|maybe_user| maybe_user.map(|stored| AuthMeResult { user: stored.user }))
    }

    pub fn get_user_by_public_user_code(
        &self,
        public_user_code: &str,
    ) -> Result<Option<PublicUserSearchResult>, PasswordEntryError> {
        let normalized_public_user_code = normalize_public_user_code(public_user_code)?;
        self.store
            .find_by_public_user_code(&normalized_public_user_code)
            .map(|maybe_user| maybe_user.map(|stored| PublicUserSearchResult { user: stored.user }))
    }

    pub async fn change_password(
        &self,
        input: ChangePasswordInput,
    ) -> Result<ChangePasswordResult, PasswordEntryError> {
        validate_password(&input.new_password)?;
        let stored_user = self
            .store
            .find_by_user_id(&input.user_id)?
            .ok_or(PasswordEntryError::UserNotFound)?;

        if stored_user.password_login_enabled {
            let current_password = input
                .current_password
                .as_deref()
                .map(str::trim)
                .filter(|value| !value.is_empty())
                .ok_or(PasswordEntryError::InvalidCredentials)?;
            let is_valid = verify_password(&stored_user.password_hash, current_password)
                .await
                .map_err(|error| PasswordEntryError::PasswordHash(error.to_string()))?;
            if !is_valid {
                return Err(PasswordEntryError::InvalidCredentials);
            }
        }

        let password_hash = hash_password(&input.new_password)
            .await
            .map_err(|error| PasswordEntryError::PasswordHash(error.to_string()))?;
        let user = self
            .store
            .set_user_password_hash(&input.user_id, password_hash)?
            .ok_or(PasswordEntryError::UserNotFound)?;

        Ok(ChangePasswordResult { user })
    }
}

impl RefreshSessionService {
    pub fn new(store: InMemoryAuthStore, refresh_session_ttl_days: u32) -> Self {
        Self {
            store,
            refresh_session_ttl_days,
        }
    }

    pub fn create_session(
        &self,
        input: CreateRefreshSessionInput,
        now: OffsetDateTime,
    ) -> Result<CreateRefreshSessionResult, RefreshSessionError> {
        self.store
            .find_by_user_id(&input.user_id)
            .map_err(map_password_store_error)?
            .ok_or(RefreshSessionError::UserNotFound)?;

        let session_id = build_prefixed_uuid_id("usess_");
        let expires_at = now
            .checked_add(Duration::days(i64::from(self.refresh_session_ttl_days)))
            .ok_or_else(|| {
                RefreshSessionError::Store("refresh session 过期时间计算溢出".to_string())
            })?;
        let now_iso = format_rfc3339_with_context(now, "refresh session 时间")?;
        let expires_at_iso = format_rfc3339_with_context(expires_at, "refresh session 过期时间")?;
        let session = RefreshSessionRecord {
            session_id,
            user_id: input.user_id,
            refresh_token_hash: input.refresh_token_hash,
            issued_by_provider: input.issued_by_provider,
            client_info: input.client_info,
            expires_at: expires_at_iso,
            revoked_at: None,
            created_at: now_iso.clone(),
            updated_at: now_iso.clone(),
            last_seen_at: now_iso,
        };

        self.store.insert_session(session.clone())?;

        Ok(CreateRefreshSessionResult { session })
    }

    pub fn rotate_session(
        &self,
        input: RotateRefreshSessionInput,
        now: OffsetDateTime,
    ) -> Result<RotateRefreshSessionResult, RefreshSessionError> {
        let Some(refresh_token_hash) = normalize_required_string(&input.refresh_token_hash) else {
            return Err(RefreshSessionError::MissingToken);
        };

        let session = self
            .store
            .find_session_by_refresh_token_hash(&refresh_token_hash)?
            .ok_or(RefreshSessionError::SessionNotFound)?;

        if session.session.revoked_at.is_some() {
            return Err(RefreshSessionError::SessionNotFound);
        }

        let expires_at =
            parse_rfc3339_with_context(&session.session.expires_at, "refresh session 过期时间")?;
        if expires_at <= now {
            return Err(RefreshSessionError::SessionExpired);
        }

        let user = self
            .store
            .find_by_user_id(&session.session.user_id)
            .map_err(map_password_store_error)?
            .ok_or(RefreshSessionError::UserNotFound)?;

        let next_expires_at = now
            .checked_add(Duration::days(i64::from(self.refresh_session_ttl_days)))
            .ok_or_else(|| {
                RefreshSessionError::Store("refresh session 过期时间计算溢出".to_string())
            })?;
        let now_iso = format_rfc3339_with_context(now, "refresh session 时间")?;
        let next_expires_at_iso =
            format_rfc3339_with_context(next_expires_at, "refresh session 过期时间")?;

        let updated_session = self.store.rotate_session(
            &session.session.session_id,
            &session.session.refresh_token_hash,
            input.next_refresh_token_hash,
            next_expires_at_iso,
            now_iso.clone(),
            now_iso,
        )?;

        Ok(RotateRefreshSessionResult {
            session: updated_session.session,
            user: user.user,
        })
    }

    pub fn list_active_sessions_by_user(
        &self,
        user_id: &str,
        now: OffsetDateTime,
    ) -> Result<ListActiveRefreshSessionsResult, RefreshSessionError> {
        self.store
            .find_by_user_id(user_id)
            .map_err(map_password_store_error)?
            .ok_or(RefreshSessionError::UserNotFound)?;

        let sessions = self.store.list_active_sessions_by_user(user_id, now)?;
        Ok(ListActiveRefreshSessionsResult { sessions })
    }
}

impl PhoneAuthService {
    pub fn new(store: InMemoryAuthStore, sms_provider: SmsAuthProvider) -> Self {
        Self {
            store,
            sms_provider,
        }
    }

    pub async fn send_code(
        &self,
        input: SendPhoneCodeInput,
        now: OffsetDateTime,
    ) -> Result<SendPhoneCodeResult, PhoneAuthError> {
        let scene = input.scene.clone();
        let normalized_phone = normalize_mainland_china_phone_number(&input.phone_number)?;
        let national_phone_number = build_national_phone_number(&normalized_phone.e164)?;
        info!(
            scene = scene.as_str(),
            provider = self.sms_provider.kind().as_str(),
            phone_e164_masked = mask_phone_number(&normalized_phone.e164).as_str(),
            phone_national_masked = normalized_phone.masked_national_number.as_str(),
            "手机号验证码发送准备调用 provider"
        );
        self.store
            .ensure_phone_code_not_cooling_down(&normalized_phone.e164, &scene, now)?;
        let expires_at = now
            .checked_add(Duration::minutes(SMS_CODE_TTL_MINUTES))
            .ok_or_else(|| PhoneAuthError::Store("短信验证码过期时间计算溢出".to_string()))?;
        let expires_at = format_rfc3339(expires_at).map_err(|message| {
            PhoneAuthError::Store(format!("短信验证码过期时间格式化失败：{message}"))
        })?;

        let provider_result = self
            .sms_provider
            .send_code(SmsSendCodeRequest {
                national_phone_number,
                scene: input.scene.as_str().to_string(),
            })
            .await
            .map_err(map_sms_provider_error_to_phone_error)?;
        info!(
            scene = scene.as_str(),
            provider = self.sms_provider.kind().as_str(),
            phone_e164_masked = mask_phone_number(&normalized_phone.e164).as_str(),
            phone_national_masked = normalized_phone.masked_national_number.as_str(),
            cooldown_seconds = provider_result.cooldown_seconds,
            expires_in_seconds = provider_result.expires_in_seconds,
            provider_request_id = provider_result
                .provider_request_id
                .as_deref()
                .unwrap_or("unknown"),
            provider_out_id = provider_result
                .provider_out_id
                .as_deref()
                .unwrap_or("unknown"),
            "手机号验证码 provider 调用成功，准备写入本地快照"
        );

        self.store.upsert_phone_code(
            StoredPhoneCode {
                phone_number: normalized_phone.e164.clone(),
                scene,
                expires_at,
                last_sent_at: format_rfc3339(now).map_err(|message| {
                    PhoneAuthError::Store(format!("短信验证码发送时间格式化失败：{message}"))
                })?,
                failed_attempts: 0,
                provider_out_id: provider_result.provider_out_id.clone(),
            },
            now,
        )?;

        Ok(SendPhoneCodeResult {
            cooldown_seconds: provider_result.cooldown_seconds,
            expires_in_seconds: provider_result.expires_in_seconds,
            provider_request_id: provider_result.provider_request_id,
            provider_out_id: provider_result.provider_out_id,
            provider: self.sms_provider.kind().as_str().to_string(),
            scene: input.scene.as_str().to_string(),
            phone_number_masked: normalized_phone.masked_national_number,
        })
    }

    pub async fn login(
        &self,
        input: PhoneLoginInput,
        now: OffsetDateTime,
    ) -> Result<PhoneLoginResult, PhoneAuthError> {
        let normalized_phone = normalize_mainland_china_phone_number(&input.phone_number)?;
        verify_sms_code_format(&input.verify_code)?;
        let provider_out_id = self.store.assert_phone_code_active(
            &normalized_phone.e164,
            &PhoneAuthScene::Login,
            now,
        )?;
        match self
            .sms_provider
            .verify_code(SmsVerifyCodeRequest {
                national_phone_number: build_national_phone_number(&normalized_phone.e164)?,
                verify_code: input.verify_code.trim().to_string(),
                provider_out_id: provider_out_id.clone(),
            })
            .await
        {
            Ok(()) => self
                .store
                .consume_phone_code_success(&normalized_phone.e164, &PhoneAuthScene::Login)?,
            Err(SmsProviderError::InvalidVerifyCode) => self
                .store
                .consume_phone_code_failure(&normalized_phone.e164, &PhoneAuthScene::Login)?,
            Err(other) => return Err(map_sms_provider_error_to_phone_error(other)),
        }

        if let Some(user) = self
            .store
            .find_by_phone_number(&normalized_phone.e164)?
            .map(|stored| stored.user)
        {
            return Ok(PhoneLoginResult {
                user: AuthUser {
                    login_method: AuthLoginMethod::Phone,
                    ..user
                },
                created: false,
                provider: self.sms_provider.kind().as_str().to_string(),
                provider_out_id,
                phone_number_masked: normalized_phone.masked_national_number,
            });
        }

        let password_hash = hash_password(&build_random_password_seed())
            .await
            .map_err(|error| PhoneAuthError::PasswordHash(error.to_string()))?;
        let created_user = self.store.create_phone_user(
            normalized_phone.clone(),
            normalized_phone.masked_national_number.clone(),
            password_hash,
        )?;

        Ok(PhoneLoginResult {
            user: created_user,
            created: true,
            provider: self.sms_provider.kind().as_str().to_string(),
            provider_out_id,
            phone_number_masked: normalized_phone.masked_national_number,
        })
    }

    pub async fn reset_password(
        &self,
        input: ResetPasswordInput,
        now: OffsetDateTime,
    ) -> Result<ResetPasswordResult, PhoneAuthError> {
        let normalized_phone = normalize_mainland_china_phone_number(&input.phone_number)?;
        verify_sms_code_format(&input.verify_code)?;
        validate_password(&input.new_password).map_err(map_password_error_to_phone_error)?;
        let provider_out_id = self.store.assert_phone_code_active(
            &normalized_phone.e164,
            &PhoneAuthScene::ResetPassword,
            now,
        )?;
        match self
            .sms_provider
            .verify_code(SmsVerifyCodeRequest {
                national_phone_number: build_national_phone_number(&normalized_phone.e164)?,
                verify_code: input.verify_code.trim().to_string(),
                provider_out_id: provider_out_id.clone(),
            })
            .await
        {
            Ok(()) => self.store.consume_phone_code_success(
                &normalized_phone.e164,
                &PhoneAuthScene::ResetPassword,
            )?,
            Err(SmsProviderError::InvalidVerifyCode) => self.store.consume_phone_code_failure(
                &normalized_phone.e164,
                &PhoneAuthScene::ResetPassword,
            )?,
            Err(other) => return Err(map_sms_provider_error_to_phone_error(other)),
        }

        self.store
            .find_by_phone_number(&normalized_phone.e164)?
            .ok_or(PhoneAuthError::UserNotFound)?;
        let password_hash = hash_password(&input.new_password)
            .await
            .map_err(|error| PhoneAuthError::PasswordHash(error.to_string()))?;
        let user = self
            .store
            .set_user_password_by_phone_number(&normalized_phone.e164, password_hash)?;

        Ok(ResetPasswordResult {
            user,
            provider: self.sms_provider.kind().as_str().to_string(),
            provider_out_id,
            phone_number_masked: normalized_phone.masked_national_number,
        })
    }

    pub async fn bind_wechat_phone(
        &self,
        input: BindWechatPhoneInput,
        now: OffsetDateTime,
    ) -> Result<BindWechatPhoneResult, PhoneAuthError> {
        let normalized_phone = normalize_mainland_china_phone_number(&input.phone_number)?;
        verify_sms_code_format(&input.verify_code)?;
        let provider_out_id = self.store.assert_phone_code_active(
            &normalized_phone.e164,
            &PhoneAuthScene::BindPhone,
            now,
        )?;
        match self
            .sms_provider
            .verify_code(SmsVerifyCodeRequest {
                national_phone_number: build_national_phone_number(&normalized_phone.e164)?,
                verify_code: input.verify_code.trim().to_string(),
                provider_out_id,
            })
            .await
        {
            Ok(()) => self
                .store
                .consume_phone_code_success(&normalized_phone.e164, &PhoneAuthScene::BindPhone)?,
            Err(SmsProviderError::InvalidVerifyCode) => self
                .store
                .consume_phone_code_failure(&normalized_phone.e164, &PhoneAuthScene::BindPhone)?,
            Err(other) => return Err(map_sms_provider_error_to_phone_error(other)),
        }

        let current_user = self
            .store
            .find_by_user_id(&input.user_id)
            .map_err(map_password_error_to_phone_error)?
            .ok_or(PhoneAuthError::UserNotFound)?;
        if current_user.user.binding_status != AuthBindingStatus::PendingBindPhone {
            return Err(PhoneAuthError::UserStateMismatch);
        }
        if !current_user.user.wechat_bound {
            return Err(PhoneAuthError::UserStateMismatch);
        }

        let merged_user = self
            .store
            .bind_wechat_phone_to_user(&input.user_id, normalized_phone)?;

        Ok(BindWechatPhoneResult { user: merged_user })
    }
}

impl WechatAuthStateService {
    pub fn new(store: InMemoryAuthStore, state_ttl_minutes: u32) -> Self {
        Self {
            store,
            state_ttl_minutes,
        }
    }

    pub fn create_state(
        &self,
        input: CreateWechatAuthStateInput,
        now: OffsetDateTime,
    ) -> Result<CreateWechatAuthStateResult, WechatAuthError> {
        let created_at = format_rfc3339(now).map_err(|message| {
            WechatAuthError::Store(format!("微信 state 时间格式化失败：{message}"))
        })?;
        let expires_at = now
            .checked_add(Duration::minutes(i64::from(self.state_ttl_minutes)))
            .ok_or_else(|| WechatAuthError::Store("微信 state 过期时间计算溢出".to_string()))?;
        let expires_at = format_rfc3339(expires_at).map_err(|message| {
            WechatAuthError::Store(format!("微信 state 过期时间格式化失败：{message}"))
        })?;
        let state = WechatAuthStateRecord {
            wechat_state_id: build_prefixed_uuid_id("wxstate_"),
            state_token: create_wechat_state_token(),
            redirect_path: normalize_required_string(&input.redirect_path).unwrap_or_default(),
            scene: input.scene,
            request_user_agent: normalize_optional_string(input.request_user_agent),
            expires_at,
            consumed_at: None,
            created_at: created_at.clone(),
            updated_at: created_at,
        };
        self.store.insert_wechat_state(state.clone())?;
        Ok(CreateWechatAuthStateResult { state })
    }

    pub fn consume_state(
        &self,
        state_token: &str,
        now: OffsetDateTime,
    ) -> Result<ConsumeWechatAuthStateResult, WechatAuthError> {
        let consumed = self.store.consume_wechat_state(state_token, now)?;
        Ok(ConsumeWechatAuthStateResult {
            state: consumed.state,
        })
    }
}

impl WechatAuthService {
    pub fn new(store: InMemoryAuthStore) -> Self {
        Self { store }
    }

    pub async fn resolve_login(
        &self,
        input: ResolveWechatLoginInput,
    ) -> Result<ResolveWechatLoginResult, WechatAuthError> {
        if input.profile.provider_uid.trim().is_empty()
            && input
                .profile
                .provider_union_id
                .as_ref()
                .is_none_or(|value| value.trim().is_empty())
        {
            return Err(WechatAuthError::MissingProfile);
        }

        if let Some(user) = self.store.find_by_wechat_identity(
            input.profile.provider_uid.trim(),
            input.profile.provider_union_id.as_deref(),
        )? {
            let refreshed_user = self
                .store
                .refresh_wechat_identity_profile(&user.id, input.profile)?;
            return Ok(ResolveWechatLoginResult {
                user: refreshed_user,
                created: false,
            });
        }

        let password_hash = hash_password(&build_random_password_seed())
            .await
            .map_err(|error| WechatAuthError::PasswordHash(error.to_string()))?;
        let created_user = self
            .store
            .create_pending_wechat_user(input.profile, password_hash)?;
        Ok(ResolveWechatLoginResult {
            user: created_user,
            created: true,
        })
    }
}

impl AuthUserService {
    pub fn new(store: InMemoryAuthStore) -> Self {
        Self { store }
    }

    pub fn get_user_by_id(&self, user_id: &str) -> Result<Option<AuthUser>, LogoutError> {
        self.store
            .find_by_user_id(user_id)
            .map(|maybe_user| maybe_user.map(|stored| stored.user))
            .map_err(map_password_error_to_logout_error)
    }

    pub fn get_user_by_public_user_code(
        &self,
        public_user_code: &str,
    ) -> Result<Option<AuthUser>, LogoutError> {
        let normalized_public_user_code = normalize_public_user_code(public_user_code)
            .map_err(map_password_error_to_logout_error)?;
        self.store
            .find_by_public_user_code(&normalized_public_user_code)
            .map(|maybe_user| maybe_user.map(|stored| stored.user))
            .map_err(map_password_error_to_logout_error)
    }

    pub fn logout_current_session(
        &self,
        input: LogoutCurrentSessionInput,
        now: OffsetDateTime,
    ) -> Result<LogoutCurrentSessionResult, LogoutError> {
        if let Some(refresh_token_hash) = input
            .refresh_token_hash
            .as_ref()
            .map(|value| value.trim())
            .filter(|value| !value.is_empty())
        {
            self.store
                .revoke_session_by_refresh_token_hash(refresh_token_hash, now)
                .map_err(map_refresh_error_to_logout_error)?;
        }

        let user = self
            .store
            .increment_user_token_version(&input.user_id)
            .map_err(map_password_error_to_logout_error)?
            .ok_or(LogoutError::UserNotFound)?;

        Ok(LogoutCurrentSessionResult { user })
    }

    // 全端登出需要先吊销该用户全部 refresh session，再统一提升 token_version，
    // 让所有旧 access token 在下一次鉴权时立即失效。
    pub fn logout_all_sessions(
        &self,
        input: LogoutAllSessionsInput,
        now: OffsetDateTime,
    ) -> Result<LogoutAllSessionsResult, LogoutError> {
        self.store
            .revoke_all_sessions_by_user_id(&input.user_id, now)
            .map_err(map_refresh_error_to_logout_error)?;

        let user = self
            .store
            .increment_user_token_version(&input.user_id)
            .map_err(map_password_error_to_logout_error)?
            .ok_or(LogoutError::UserNotFound)?;

        Ok(LogoutAllSessionsResult { user })
    }
}

impl Default for InMemoryAuthStore {
    fn default() -> Self {
        Self {
            inner: Arc::new(Mutex::new(InMemoryAuthStoreState::default())),
            persistence_path: None,
        }
    }
}

impl Default for InMemoryAuthStoreState {
    fn default() -> Self {
        Self {
            next_user_id: 1,
            users_by_username: HashMap::new(),
            phone_to_user_id: HashMap::new(),
            sessions_by_id: HashMap::new(),
            session_id_by_refresh_token_hash: HashMap::new(),
            phone_codes_by_key: HashMap::new(),
            wechat_states_by_token: HashMap::new(),
            wechat_identity_by_provider_uid: HashMap::new(),
            user_id_by_provider_union_id: HashMap::new(),
        }
    }
}

impl InMemoryAuthStoreState {
    fn from_persistent_snapshot(snapshot: PersistentAuthStoreSnapshot) -> Self {
        Self {
            next_user_id: snapshot.next_user_id,
            users_by_username: snapshot.users_by_username,
            phone_to_user_id: snapshot.phone_to_user_id,
            sessions_by_id: snapshot.sessions_by_id,
            session_id_by_refresh_token_hash: snapshot.session_id_by_refresh_token_hash,
            phone_codes_by_key: HashMap::new(),
            wechat_states_by_token: HashMap::new(),
            wechat_identity_by_provider_uid: snapshot.wechat_identity_by_provider_uid,
            user_id_by_provider_union_id: snapshot.user_id_by_provider_union_id,
        }
    }

    fn to_persistent_snapshot(&self) -> PersistentAuthStoreSnapshot {
        PersistentAuthStoreSnapshot {
            next_user_id: self.next_user_id,
            users_by_username: self.users_by_username.clone(),
            phone_to_user_id: self.phone_to_user_id.clone(),
            sessions_by_id: self.sessions_by_id.clone(),
            session_id_by_refresh_token_hash: self.session_id_by_refresh_token_hash.clone(),
            wechat_identity_by_provider_uid: self.wechat_identity_by_provider_uid.clone(),
            user_id_by_provider_union_id: self.user_id_by_provider_union_id.clone(),
        }
    }
}

fn build_temp_persistence_path(path: &Path) -> PathBuf {
    let file_name = path
        .file_name()
        .and_then(|value| value.to_str())
        .unwrap_or("auth-store.json");
    path.with_file_name(format!("{file_name}.tmp"))
}

impl InMemoryAuthStore {
    pub fn from_snapshot_json(snapshot_json: &str) -> Result<Self, String> {
        let snapshot = serde_json::from_str::<PersistentAuthStoreSnapshot>(snapshot_json)
            .map_err(|error| format!("解析认证快照失败：{error}"))?;
        Ok(Self {
            inner: Arc::new(Mutex::new(
                InMemoryAuthStoreState::from_persistent_snapshot(snapshot),
            )),
            persistence_path: None,
        })
    }

    pub fn from_persistence_path(path: impl Into<PathBuf>) -> Result<Self, String> {
        let path = path.into();
        let state = if path.is_file() {
            let raw_text =
                fs::read_to_string(&path).map_err(|error| format!("读取认证快照失败：{error}"))?;
            let snapshot = serde_json::from_str::<PersistentAuthStoreSnapshot>(&raw_text)
                .map_err(|error| format!("解析认证快照失败：{error}"))?;
            InMemoryAuthStoreState::from_persistent_snapshot(snapshot)
        } else {
            InMemoryAuthStoreState::default()
        };

        Ok(Self {
            inner: Arc::new(Mutex::new(state)),
            persistence_path: Some(Arc::new(path)),
        })
    }

    pub fn export_snapshot_json(&self) -> Result<String, String> {
        let state = self
            .inner
            .lock()
            .map_err(|_| "认证仓储锁已中毒".to_string())?;
        let snapshot = state.to_persistent_snapshot();
        serde_json::to_string_pretty(&snapshot)
            .map_err(|error| format!("序列化认证快照失败：{error}"))
    }

    fn persist_state(&self, state: &InMemoryAuthStoreState) -> Result<(), String> {
        let Some(path) = self.persistence_path.as_deref() else {
            return Ok(());
        };

        if let Some(parent_dir) = path.parent() {
            fs::create_dir_all(parent_dir).map_err(|error| {
                format!(
                    "创建认证快照目录失败：{}，路径：{}",
                    error,
                    parent_dir.display()
                )
            })?;
        }

        let snapshot = state.to_persistent_snapshot();
        let raw_text = serde_json::to_string_pretty(&snapshot)
            .map_err(|error| format!("序列化认证快照失败：{error}"))?;
        let temp_path = build_temp_persistence_path(path);
        fs::write(&temp_path, raw_text)
            .map_err(|error| format!("写入认证快照临时文件失败：{error}"))?;
        fs::rename(&temp_path, path).map_err(|error| {
            let _ = fs::remove_file(&temp_path);
            format!("替换认证快照文件失败：{error}")
        })
    }

    fn persist_password_state(
        &self,
        state: &InMemoryAuthStoreState,
    ) -> Result<(), PasswordEntryError> {
        self.persist_state(state).map_err(PasswordEntryError::Store)
    }

    fn persist_phone_state(&self, state: &InMemoryAuthStoreState) -> Result<(), PhoneAuthError> {
        self.persist_state(state).map_err(PhoneAuthError::Store)
    }

    fn persist_wechat_state(&self, state: &InMemoryAuthStoreState) -> Result<(), WechatAuthError> {
        self.persist_state(state).map_err(WechatAuthError::Store)
    }

    fn persist_refresh_state(
        &self,
        state: &InMemoryAuthStoreState,
    ) -> Result<(), RefreshSessionError> {
        self.persist_state(state)
            .map_err(RefreshSessionError::Store)
    }

    fn find_by_user_id(
        &self,
        user_id: &str,
    ) -> Result<Option<StoredPasswordUser>, PasswordEntryError> {
        let state = self
            .inner
            .lock()
            .map_err(|_| PasswordEntryError::Store("用户仓储锁已中毒".to_string()))?;

        Ok(state
            .users_by_username
            .values()
            .find(|stored_user| stored_user.user.id == user_id)
            .cloned())
    }

    fn find_by_public_user_code(
        &self,
        public_user_code: &str,
    ) -> Result<Option<StoredPasswordUser>, PasswordEntryError> {
        let state = self
            .inner
            .lock()
            .map_err(|_| PasswordEntryError::Store("用户仓储锁已中毒".to_string()))?;

        Ok(state
            .users_by_username
            .values()
            .find(|stored_user| stored_user.user.public_user_code == public_user_code)
            .cloned())
    }

    fn find_by_phone_number(
        &self,
        phone_number: &str,
    ) -> Result<Option<StoredPasswordUser>, PhoneAuthError> {
        let state = self
            .inner
            .lock()
            .map_err(|_| PhoneAuthError::Store("用户仓储锁已中毒".to_string()))?;
        let Some(user_id) = state.phone_to_user_id.get(phone_number) else {
            return Ok(None);
        };
        Ok(state
            .users_by_username
            .values()
            .find(|stored_user| stored_user.user.id == *user_id)
            .cloned())
    }

    fn find_by_phone_number_for_password(
        &self,
        phone_number: &str,
    ) -> Result<Option<StoredPasswordUser>, PasswordEntryError> {
        let state = self
            .inner
            .lock()
            .map_err(|_| PasswordEntryError::Store("用户仓储锁已中毒".to_string()))?;
        let Some(user_id) = state.phone_to_user_id.get(phone_number) else {
            return Ok(None);
        };
        Ok(state
            .users_by_username
            .values()
            .find(|stored_user| stored_user.user.id == *user_id)
            .cloned())
    }

    fn create_phone_user(
        &self,
        phone_number: PhoneNumberSnapshot,
        display_name: String,
        password_hash: String,
    ) -> Result<AuthUser, PhoneAuthError> {
        let mut state = self
            .inner
            .lock()
            .map_err(|_| PhoneAuthError::Store("用户仓储锁已中毒".to_string()))?;
        if state.phone_to_user_id.contains_key(&phone_number.e164) {
            return Err(PhoneAuthError::Store(
                "手机号已存在，无法重复创建账号".to_string(),
            ));
        }

        let sequence = state.next_user_id;
        let user_id = format!("user_{sequence:08}");
        let public_user_code = build_public_user_code(sequence);
        state.next_user_id += 1;
        let username = build_system_username("phone", state.next_user_id);
        let user = AuthUser {
            id: user_id.clone(),
            public_user_code,
            username: username.clone(),
            display_name,
            phone_number_masked: Some(phone_number.masked_national_number.clone()),
            login_method: AuthLoginMethod::Phone,
            binding_status: AuthBindingStatus::Active,
            wechat_bound: false,
            token_version: 1,
        };
        state
            .phone_to_user_id
            .insert(phone_number.e164.clone(), user_id);
        state.users_by_username.insert(
            username,
            StoredPasswordUser {
                user: user.clone(),
                password_hash,
                password_login_enabled: false,
                phone_number: Some(phone_number.e164),
            },
        );
        self.persist_phone_state(&state)?;

        Ok(user)
    }

    fn create_pending_wechat_user(
        &self,
        profile: WechatIdentityProfile,
        password_hash: String,
    ) -> Result<AuthUser, WechatAuthError> {
        let mut state = self
            .inner
            .lock()
            .map_err(|_| WechatAuthError::Store("用户仓储锁已中毒".to_string()))?;

        let sequence = state.next_user_id;
        let user_id = format!("user_{sequence:08}");
        let public_user_code = build_public_user_code(sequence);
        state.next_user_id += 1;
        let username = build_system_username("wechat", state.next_user_id);
        let display_name = profile
            .display_name
            .as_deref()
            .map(str::trim)
            .filter(|value| !value.is_empty())
            .unwrap_or("微信旅人")
            .to_string();
        let user = AuthUser {
            id: user_id.clone(),
            public_user_code,
            username: username.clone(),
            display_name,
            phone_number_masked: None,
            login_method: AuthLoginMethod::Wechat,
            binding_status: AuthBindingStatus::PendingBindPhone,
            wechat_bound: true,
            token_version: 1,
        };
        state.users_by_username.insert(
            username,
            StoredPasswordUser {
                user: user.clone(),
                password_hash,
                password_login_enabled: false,
                phone_number: None,
            },
        );
        let identity = StoredWechatIdentity {
            user_id: user_id.clone(),
            provider_uid: normalize_required_string(&profile.provider_uid).unwrap_or_default(),
            provider_union_id: normalize_optional_string(profile.provider_union_id),
            display_name: normalize_optional_string(profile.display_name),
            avatar_url: normalize_optional_string(profile.avatar_url),
        };
        if let Some(provider_union_id) = identity.provider_union_id.clone() {
            state
                .user_id_by_provider_union_id
                .insert(provider_union_id, user_id.clone());
        }
        state
            .wechat_identity_by_provider_uid
            .insert(identity.provider_uid.clone(), identity);
        self.persist_wechat_state(&state)?;

        Ok(user)
    }

    fn find_by_wechat_identity(
        &self,
        provider_uid: &str,
        provider_union_id: Option<&str>,
    ) -> Result<Option<AuthUser>, WechatAuthError> {
        let state = self
            .inner
            .lock()
            .map_err(|_| WechatAuthError::Store("用户仓储锁已中毒".to_string()))?;

        if let Some(provider_union_id) = provider_union_id
            .map(str::trim)
            .filter(|value| !value.is_empty())
            && let Some(user_id) = state.user_id_by_provider_union_id.get(provider_union_id)
            && let Some(stored) = state
                .users_by_username
                .values()
                .find(|stored_user| stored_user.user.id == *user_id)
        {
            return Ok(Some(stored.user.clone()));
        }

        let Some(identity) = state
            .wechat_identity_by_provider_uid
            .get(provider_uid.trim())
        else {
            return Ok(None);
        };
        Ok(state
            .users_by_username
            .values()
            .find(|stored_user| stored_user.user.id == identity.user_id)
            .map(|stored| stored.user.clone()))
    }

    fn refresh_wechat_identity_profile(
        &self,
        user_id: &str,
        profile: WechatIdentityProfile,
    ) -> Result<AuthUser, WechatAuthError> {
        let mut state = self
            .inner
            .lock()
            .map_err(|_| WechatAuthError::Store("用户仓储锁已中毒".to_string()))?;

        let next_display_name = normalize_optional_string(profile.display_name);
        let next_avatar_url = normalize_optional_string(profile.avatar_url);
        let next_provider_union_id = normalize_optional_string(profile.provider_union_id);
        let next_provider_uid =
            normalize_required_string(&profile.provider_uid).unwrap_or_default();
        {
            let identity = state
                .wechat_identity_by_provider_uid
                .remove(profile.provider_uid.trim())
                .or_else(|| {
                    state
                        .wechat_identity_by_provider_uid
                        .values()
                        .find(|identity| identity.user_id == user_id)
                        .cloned()
                })
                .ok_or(WechatAuthError::MissingWechatIdentity)?;
            let mut identity = identity;
            // 微信同一 unionid 在不同应用或不同阶段可能回传新的 openid，这里要把最新 provider_uid 回写，
            // 否则下一次只能按 unionid 命中，随后刷新资料时会因为旧 openid 不存在而丢失 identity。
            identity.provider_uid = next_provider_uid.clone();
            identity.display_name = next_display_name.clone();
            identity.avatar_url = next_avatar_url;
            identity.provider_union_id = next_provider_union_id.clone();
            state
                .wechat_identity_by_provider_uid
                .insert(next_provider_uid.clone(), identity);
        }
        if let Some(provider_union_id) = next_provider_union_id {
            state
                .user_id_by_provider_union_id
                .insert(provider_union_id, user_id.to_string());
        }

        let next_user = {
            let stored_user = state
                .users_by_username
                .values_mut()
                .find(|stored_user| stored_user.user.id == user_id)
                .ok_or(WechatAuthError::UserNotFound)?;
            if let Some(display_name) = next_display_name
                .as_deref()
                .map(str::trim)
                .filter(|value| !value.is_empty())
                && stored_user.user.binding_status == AuthBindingStatus::PendingBindPhone
            {
                stored_user.user.display_name = display_name.to_string();
            }
            stored_user.user.clone()
        };
        self.persist_wechat_state(&state)?;

        Ok(next_user)
    }

    fn insert_session(&self, session: RefreshSessionRecord) -> Result<(), RefreshSessionError> {
        let mut state = self
            .inner
            .lock()
            .map_err(|_| RefreshSessionError::Store("会话仓储锁已中毒".to_string()))?;

        if state
            .session_id_by_refresh_token_hash
            .contains_key(&session.refresh_token_hash)
        {
            return Err(RefreshSessionError::Store(
                "refresh token hash 已存在，无法重复创建会话".to_string(),
            ));
        }

        state.session_id_by_refresh_token_hash.insert(
            session.refresh_token_hash.clone(),
            session.session_id.clone(),
        );
        state
            .sessions_by_id
            .insert(session.session_id.clone(), StoredRefreshSession { session });
        self.persist_refresh_state(&state)?;

        Ok(())
    }

    fn upsert_phone_code(
        &self,
        code: StoredPhoneCode,
        _now: OffsetDateTime,
    ) -> Result<(), PhoneAuthError> {
        let mut state = self
            .inner
            .lock()
            .map_err(|_| PhoneAuthError::Store("短信验证码仓储锁已中毒".to_string()))?;
        // 手机号和业务场景共同决定同一份验证码快照，重复发送时直接覆盖旧值。
        let key = build_phone_code_key(&code.phone_number, &code.scene);
        state.phone_codes_by_key.insert(key, code);
        Ok(())
    }

    fn ensure_phone_code_not_cooling_down(
        &self,
        phone_number: &str,
        scene: &PhoneAuthScene,
        now: OffsetDateTime,
    ) -> Result<(), PhoneAuthError> {
        let state = self
            .inner
            .lock()
            .map_err(|_| PhoneAuthError::Store("短信验证码仓储锁已中毒".to_string()))?;
        let key = build_phone_code_key(phone_number, scene);
        let Some(stored) = state.phone_codes_by_key.get(&key).cloned() else {
            return Ok(());
        };
        drop(state);

        let expires_at = parse_phone_code_time(&stored.expires_at, "过期时间")?;
        if expires_at <= now {
            return Ok(());
        }
        let last_sent_at = parse_phone_code_time(&stored.last_sent_at, "发送时间")?;
        let cooling_until = last_sent_at
            .checked_add(Duration::seconds(SMS_CODE_COOLDOWN_SECONDS as i64))
            .ok_or_else(|| PhoneAuthError::Store("短信验证码冷却时间计算溢出".to_string()))?;
        if cooling_until <= now {
            return Ok(());
        }
        let retry_after_seconds = seconds_until(now, cooling_until);
        warn!(
            scene = scene.as_str(),
            phone_masked = mask_phone_number(phone_number).as_str(),
            retry_after_seconds,
            "手机号验证码发送命中本地冷却限制"
        );
        Err(PhoneAuthError::SendCoolingDown {
            retry_after_seconds,
        })
    }

    fn assert_phone_code_active(
        &self,
        phone_number: &str,
        scene: &PhoneAuthScene,
        now: OffsetDateTime,
    ) -> Result<Option<String>, PhoneAuthError> {
        let mut state = self
            .inner
            .lock()
            .map_err(|_| PhoneAuthError::Store("短信验证码仓储锁已中毒".to_string()))?;
        let key = build_phone_code_key(phone_number, scene);
        let stored = state
            .phone_codes_by_key
            .get(&key)
            .cloned()
            .ok_or(PhoneAuthError::VerifyCodeNotFound)?;
        let expires_at = OffsetDateTime::parse(
            &stored.expires_at,
            &time::format_description::well_known::Rfc3339,
        )
        .map_err(|error| PhoneAuthError::Store(format!("短信验证码过期时间解析失败：{error}")))?;
        if expires_at <= now {
            state.phone_codes_by_key.remove(&key);
            return Err(PhoneAuthError::VerifyCodeExpired);
        }
        Ok(stored.provider_out_id)
    }

    fn consume_phone_code_success(
        &self,
        phone_number: &str,
        scene: &PhoneAuthScene,
    ) -> Result<(), PhoneAuthError> {
        let mut state = self
            .inner
            .lock()
            .map_err(|_| PhoneAuthError::Store("短信验证码仓储锁已中毒".to_string()))?;
        let key = build_phone_code_key(phone_number, scene);
        state.phone_codes_by_key.remove(&key);
        Ok(())
    }

    fn consume_phone_code_failure(
        &self,
        phone_number: &str,
        scene: &PhoneAuthScene,
    ) -> Result<(), PhoneAuthError> {
        let mut state = self
            .inner
            .lock()
            .map_err(|_| PhoneAuthError::Store("短信验证码仓储锁已中毒".to_string()))?;
        let key = build_phone_code_key(phone_number, scene);
        let Some(stored) = state.phone_codes_by_key.get(&key).cloned() else {
            return Err(PhoneAuthError::VerifyCodeNotFound);
        };
        let next_failed_attempts = stored.failed_attempts.saturating_add(1);
        if next_failed_attempts >= SMS_CODE_MAX_FAILED_ATTEMPTS {
            state.phone_codes_by_key.remove(&key);
            return Err(PhoneAuthError::VerifyAttemptsExceeded);
        }
        if let Some(current) = state.phone_codes_by_key.get_mut(&key) {
            current.failed_attempts = next_failed_attempts;
        }
        Err(PhoneAuthError::InvalidVerifyCode)
    }

    fn insert_wechat_state(
        &self,
        state_record: WechatAuthStateRecord,
    ) -> Result<(), WechatAuthError> {
        let mut state = self
            .inner
            .lock()
            .map_err(|_| WechatAuthError::Store("微信 state 仓储锁已中毒".to_string()))?;
        if state
            .wechat_states_by_token
            .contains_key(&state_record.state_token)
        {
            return Err(WechatAuthError::Store("微信 state 已存在".to_string()));
        }
        state.wechat_states_by_token.insert(
            state_record.state_token.clone(),
            StoredWechatAuthState {
                state: state_record,
            },
        );
        Ok(())
    }

    fn consume_wechat_state(
        &self,
        state_token: &str,
        now: OffsetDateTime,
    ) -> Result<StoredWechatAuthState, WechatAuthError> {
        let mut state = self
            .inner
            .lock()
            .map_err(|_| WechatAuthError::Store("微信 state 仓储锁已中毒".to_string()))?;
        let stored = state
            .wechat_states_by_token
            .get(state_token.trim())
            .cloned()
            .ok_or(WechatAuthError::StateNotFound)?;
        if stored.state.consumed_at.is_some() {
            return Err(WechatAuthError::StateConsumed);
        }
        let expires_at = OffsetDateTime::parse(
            &stored.state.expires_at,
            &time::format_description::well_known::Rfc3339,
        )
        .map_err(|error| WechatAuthError::Store(format!("微信 state 过期时间解析失败：{error}")))?;
        if expires_at <= now {
            return Err(WechatAuthError::StateExpired);
        }
        let now_iso = format_rfc3339(now).map_err(|message| {
            WechatAuthError::Store(format!("微信 state 时间格式化失败：{message}"))
        })?;
        let current = state
            .wechat_states_by_token
            .get_mut(state_token.trim())
            .ok_or(WechatAuthError::StateNotFound)?;
        current.state.consumed_at = Some(now_iso.clone());
        current.state.updated_at = now_iso;
        Ok(current.clone())
    }

    fn bind_wechat_phone_to_user(
        &self,
        pending_user_id: &str,
        phone_number: PhoneNumberSnapshot,
    ) -> Result<AuthUser, PhoneAuthError> {
        let mut state = self
            .inner
            .lock()
            .map_err(|_| PhoneAuthError::Store("用户仓储锁已中毒".to_string()))?;

        let existing_phone_user_id = state.phone_to_user_id.get(&phone_number.e164).cloned();
        if let Some(target_user_id) = existing_phone_user_id
            && target_user_id != pending_user_id
        {
            let pending_wechat_identity = state
                .wechat_identity_by_provider_uid
                .values()
                .find(|identity| identity.user_id == pending_user_id)
                .cloned()
                .ok_or(PhoneAuthError::UserStateMismatch)?;

            let pending_username = state
                .users_by_username
                .values()
                .find(|stored| stored.user.id == pending_user_id)
                .map(|stored| stored.user.username.clone())
                .ok_or(PhoneAuthError::UserNotFound)?;
            state.users_by_username.remove(&pending_username);

            state.wechat_identity_by_provider_uid.insert(
                pending_wechat_identity.provider_uid.clone(),
                StoredWechatIdentity {
                    user_id: target_user_id.clone(),
                    ..pending_wechat_identity.clone()
                },
            );
            if let Some(provider_union_id) = pending_wechat_identity.provider_union_id {
                state
                    .user_id_by_provider_union_id
                    .insert(provider_union_id, target_user_id.clone());
            }

            let target_user = state
                .users_by_username
                .values_mut()
                .find(|stored| stored.user.id == target_user_id)
                .ok_or(PhoneAuthError::UserNotFound)?;
            target_user.user.wechat_bound = true;
            let next_user = target_user.user.clone();
            self.persist_phone_state(&state)?;

            return Ok(next_user);
        }

        state
            .phone_to_user_id
            .insert(phone_number.e164.clone(), pending_user_id.to_string());

        let stored_user = state
            .users_by_username
            .values_mut()
            .find(|stored| stored.user.id == pending_user_id)
            .ok_or(PhoneAuthError::UserNotFound)?;
        stored_user.user.phone_number_masked = Some(phone_number.masked_national_number.clone());
        stored_user.user.binding_status = AuthBindingStatus::Active;
        stored_user.user.wechat_bound = true;
        stored_user.phone_number = Some(phone_number.e164);
        let next_user = stored_user.user.clone();
        self.persist_phone_state(&state)?;

        Ok(next_user)
    }

    fn find_session_by_refresh_token_hash(
        &self,
        refresh_token_hash: &str,
    ) -> Result<Option<StoredRefreshSession>, RefreshSessionError> {
        let state = self
            .inner
            .lock()
            .map_err(|_| RefreshSessionError::Store("会话仓储锁已中毒".to_string()))?;
        let Some(session_id) = state
            .session_id_by_refresh_token_hash
            .get(refresh_token_hash)
        else {
            return Ok(None);
        };

        Ok(state.sessions_by_id.get(session_id).cloned())
    }

    fn list_active_sessions_by_user(
        &self,
        user_id: &str,
        now: OffsetDateTime,
    ) -> Result<Vec<RefreshSessionRecord>, RefreshSessionError> {
        let state = self
            .inner
            .lock()
            .map_err(|_| RefreshSessionError::Store("会话仓储锁已中毒".to_string()))?;
        let now_unix = now.unix_timestamp();

        let mut sessions = state
            .sessions_by_id
            .values()
            .filter_map(|stored| {
                if stored.session.user_id != user_id {
                    return None;
                }
                if stored.session.revoked_at.is_some() {
                    return None;
                }
                let expires_at = OffsetDateTime::parse(
                    &stored.session.expires_at,
                    &time::format_description::well_known::Rfc3339,
                )
                .ok()?;
                if expires_at.unix_timestamp() <= now_unix {
                    return None;
                }

                Some(stored.session.clone())
            })
            .collect::<Vec<_>>();

        sessions.sort_by(|left, right| {
            right
                .last_seen_at
                .cmp(&left.last_seen_at)
                .then_with(|| right.created_at.cmp(&left.created_at))
        });

        Ok(sessions)
    }

    fn rotate_session(
        &self,
        session_id: &str,
        previous_refresh_token_hash: &str,
        next_refresh_token_hash: String,
        next_expires_at: String,
        updated_at: String,
        last_seen_at: String,
    ) -> Result<StoredRefreshSession, RefreshSessionError> {
        let mut state = self
            .inner
            .lock()
            .map_err(|_| RefreshSessionError::Store("会话仓储锁已中毒".to_string()))?;

        if state
            .session_id_by_refresh_token_hash
            .contains_key(&next_refresh_token_hash)
        {
            return Err(RefreshSessionError::Store(
                "新 refresh token hash 已存在，无法轮换".to_string(),
            ));
        }

        let current_refresh_token_hash = state
            .sessions_by_id
            .get(session_id)
            .ok_or(RefreshSessionError::SessionNotFound)?
            .session
            .refresh_token_hash
            .clone();
        if current_refresh_token_hash != previous_refresh_token_hash {
            return Err(RefreshSessionError::SessionNotFound);
        }

        state
            .session_id_by_refresh_token_hash
            .remove(previous_refresh_token_hash);
        let stored = state
            .sessions_by_id
            .get_mut(session_id)
            .ok_or(RefreshSessionError::SessionNotFound)?;
        stored.session.refresh_token_hash = next_refresh_token_hash.clone();
        stored.session.expires_at = next_expires_at;
        stored.session.updated_at = updated_at;
        stored.session.last_seen_at = last_seen_at;
        let updated_session = stored.clone();
        state.session_id_by_refresh_token_hash.insert(
            next_refresh_token_hash,
            updated_session.session.session_id.clone(),
        );
        self.persist_refresh_state(&state)?;

        Ok(updated_session)
    }

    fn revoke_session_by_refresh_token_hash(
        &self,
        refresh_token_hash: &str,
        now: OffsetDateTime,
    ) -> Result<(), RefreshSessionError> {
        let mut state = self
            .inner
            .lock()
            .map_err(|_| RefreshSessionError::Store("会话仓储锁已中毒".to_string()))?;
        let Some(session_id) = state
            .session_id_by_refresh_token_hash
            .get(refresh_token_hash)
            .cloned()
        else {
            return Ok(());
        };
        let Some(stored) = state.sessions_by_id.get_mut(&session_id) else {
            return Ok(());
        };
        if stored.session.revoked_at.is_some() {
            return Ok(());
        }
        let now_iso = now
            .format(&time::format_description::well_known::Rfc3339)
            .map_err(|error| {
                RefreshSessionError::Store(format!("会话吊销时间格式化失败：{error}"))
            })?;
        stored.session.revoked_at = Some(now_iso.clone());
        stored.session.updated_at = now_iso;
        self.persist_refresh_state(&state)?;

        Ok(())
    }

    fn revoke_all_sessions_by_user_id(
        &self,
        user_id: &str,
        now: OffsetDateTime,
    ) -> Result<(), RefreshSessionError> {
        let mut state = self
            .inner
            .lock()
            .map_err(|_| RefreshSessionError::Store("会话仓储锁已中毒".to_string()))?;
        let now_iso = now
            .format(&time::format_description::well_known::Rfc3339)
            .map_err(|error| {
                RefreshSessionError::Store(format!("会话吊销时间格式化失败：{error}"))
            })?;

        for stored in state.sessions_by_id.values_mut() {
            if stored.session.user_id != user_id {
                continue;
            }
            if stored.session.revoked_at.is_some() {
                continue;
            }

            stored.session.revoked_at = Some(now_iso.clone());
            stored.session.updated_at = now_iso.clone();
        }
        self.persist_refresh_state(&state)?;

        Ok(())
    }

    fn increment_user_token_version(
        &self,
        user_id: &str,
    ) -> Result<Option<AuthUser>, PasswordEntryError> {
        let mut state = self
            .inner
            .lock()
            .map_err(|_| PasswordEntryError::Store("用户仓储锁已中毒".to_string()))?;

        for stored_user in state.users_by_username.values_mut() {
            if stored_user.user.id != user_id {
                continue;
            }

            stored_user.user.token_version += 1;
            let next_user = stored_user.user.clone();
            self.persist_password_state(&state)?;
            return Ok(Some(next_user));
        }

        Ok(None)
    }

    fn set_user_password_hash(
        &self,
        user_id: &str,
        password_hash: String,
    ) -> Result<Option<AuthUser>, PasswordEntryError> {
        let mut state = self
            .inner
            .lock()
            .map_err(|_| PasswordEntryError::Store("用户仓储锁已中毒".to_string()))?;

        for stored_user in state.users_by_username.values_mut() {
            if stored_user.user.id != user_id {
                continue;
            }

            stored_user.password_hash = password_hash;
            stored_user.password_login_enabled = true;
            stored_user.user.token_version += 1;
            let next_user = stored_user.user.clone();
            self.persist_password_state(&state)?;
            return Ok(Some(next_user));
        }

        Ok(None)
    }

    fn set_user_password_by_phone_number(
        &self,
        phone_number: &str,
        password_hash: String,
    ) -> Result<AuthUser, PhoneAuthError> {
        let mut state = self
            .inner
            .lock()
            .map_err(|_| PhoneAuthError::Store("用户仓储锁已中毒".to_string()))?;
        let user_id = state
            .phone_to_user_id
            .get(phone_number)
            .cloned()
            .ok_or(PhoneAuthError::UserNotFound)?;

        for stored_user in state.users_by_username.values_mut() {
            if stored_user.user.id != user_id {
                continue;
            }

            stored_user.password_hash = password_hash;
            stored_user.password_login_enabled = true;
            stored_user.user.token_version += 1;
            let next_user = stored_user.user.clone();
            self.persist_phone_state(&state)?;
            return Ok(next_user);
        }

        Err(PhoneAuthError::UserNotFound)
    }
}

impl AuthLoginMethod {
    pub fn as_str(&self) -> &'static str {
        match self {
            Self::Password => "password",
            Self::Phone => "phone",
            Self::Wechat => "wechat",
        }
    }
}

impl AuthBindingStatus {
    pub fn as_str(&self) -> &'static str {
        match self {
            Self::Active => "active",
            Self::PendingBindPhone => "pending_bind_phone",
        }
    }
}

impl fmt::Display for PasswordEntryError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Self::InvalidPhoneNumber => f.write_str("手机号格式不正确"),
            Self::InvalidPasswordLength => f.write_str("密码长度需要在 6 到 128 位之间"),
            Self::InvalidPublicUserCode => f.write_str("叙世号格式不正确"),
            Self::InvalidCredentials => f.write_str("手机号或密码错误"),
            Self::UserNotFound => f.write_str("用户不存在"),
            Self::Store(message) | Self::PasswordHash(message) => f.write_str(message),
        }
    }
}

impl Error for PasswordEntryError {}

impl fmt::Display for PhoneAuthError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Self::InvalidPhoneNumber => f.write_str("手机号格式不正确"),
            Self::InvalidVerifyCode => f.write_str("验证码错误"),
            Self::VerifyCodeNotFound => f.write_str("验证码不存在或已失效"),
            Self::VerifyCodeExpired => f.write_str("验证码已过期"),
            Self::SendCoolingDown { .. } => f.write_str("验证码发送过于频繁，请稍后再试"),
            Self::VerifyAttemptsExceeded => f.write_str("验证码错误次数过多，请重新获取验证码"),
            Self::UserNotFound => f.write_str("用户不存在"),
            Self::UserStateMismatch => f.write_str("当前账号状态不允许执行该操作"),
            Self::Store(message) | Self::PasswordHash(message) => f.write_str(message),
        }
    }
}

impl Error for PhoneAuthError {}

impl fmt::Display for WechatAuthError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Self::MissingProfile => f.write_str("缺少微信身份信息"),
            Self::StateNotFound => f.write_str("微信登录状态已失效，请重新发起登录"),
            Self::StateExpired => f.write_str("微信登录状态已过期，请重新发起登录"),
            Self::StateConsumed => f.write_str("微信登录状态已被消费，请重新发起登录"),
            Self::UserNotFound => f.write_str("用户不存在"),
            Self::MissingWechatIdentity => f.write_str("当前账号缺少微信身份"),
            Self::Store(message) | Self::PasswordHash(message) => f.write_str(message),
        }
    }
}

impl Error for WechatAuthError {}

impl fmt::Display for RefreshSessionError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Self::MissingToken => f.write_str("缺少刷新会话"),
            Self::SessionNotFound | Self::SessionExpired | Self::UserNotFound => {
                f.write_str("当前登录态已失效，请重新登录")
            }
            Self::Store(message) => f.write_str(message),
        }
    }
}

impl Error for RefreshSessionError {}

impl fmt::Display for LogoutError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Self::UserNotFound => f.write_str("当前登录态已失效，请重新登录"),
            Self::Store(message) => f.write_str(message),
        }
    }
}

impl Error for LogoutError {}

fn map_password_store_error(error: PasswordEntryError) -> RefreshSessionError {
    match error {
        PasswordEntryError::Store(message) => RefreshSessionError::Store(message),
        PasswordEntryError::InvalidPhoneNumber
        | PasswordEntryError::InvalidPasswordLength
        | PasswordEntryError::InvalidPublicUserCode
        | PasswordEntryError::InvalidCredentials
        | PasswordEntryError::UserNotFound
        | PasswordEntryError::PasswordHash(_) => {
            RefreshSessionError::Store("用户仓储读取失败".to_string())
        }
    }
}

fn map_password_error_to_phone_error(error: PasswordEntryError) -> PhoneAuthError {
    match error {
        PasswordEntryError::Store(message) => PhoneAuthError::Store(message),
        PasswordEntryError::PasswordHash(message) => PhoneAuthError::PasswordHash(message),
        PasswordEntryError::InvalidPhoneNumber
        | PasswordEntryError::InvalidPasswordLength
        | PasswordEntryError::InvalidPublicUserCode
        | PasswordEntryError::InvalidCredentials
        | PasswordEntryError::UserNotFound => PhoneAuthError::Store("用户仓储读取失败".to_string()),
    }
}

fn map_password_error_to_logout_error(error: PasswordEntryError) -> LogoutError {
    match error {
        PasswordEntryError::Store(message) => LogoutError::Store(message),
        PasswordEntryError::InvalidPhoneNumber
        | PasswordEntryError::InvalidPasswordLength
        | PasswordEntryError::InvalidPublicUserCode
        | PasswordEntryError::InvalidCredentials
        | PasswordEntryError::UserNotFound
        | PasswordEntryError::PasswordHash(_) => LogoutError::Store("用户仓储读取失败".to_string()),
    }
}

fn map_sms_provider_error_to_phone_error(error: SmsProviderError) -> PhoneAuthError {
    match error {
        SmsProviderError::InvalidVerifyCode => PhoneAuthError::InvalidVerifyCode,
        SmsProviderError::InvalidConfig(message) | SmsProviderError::Upstream(message) => {
            PhoneAuthError::Store(message)
        }
    }
}

fn map_refresh_error_to_logout_error(error: RefreshSessionError) -> LogoutError {
    match error {
        RefreshSessionError::Store(message) => LogoutError::Store(message),
        RefreshSessionError::MissingToken
        | RefreshSessionError::SessionNotFound
        | RefreshSessionError::SessionExpired
        | RefreshSessionError::UserNotFound => LogoutError::Store("会话吊销失败".to_string()),
    }
}

fn validate_password(password: &str) -> Result<(), PasswordEntryError> {
    let length = password.chars().count();
    if !(PASSWORD_MIN_LENGTH..=PASSWORD_MAX_LENGTH).contains(&length) {
        return Err(PasswordEntryError::InvalidPasswordLength);
    }

    Ok(())
}

async fn verify_stored_password_user(
    existing_user: StoredPasswordUser,
    password: &str,
) -> Result<PasswordEntryResult, PasswordEntryError> {
    if !existing_user.password_login_enabled {
        return Err(PasswordEntryError::InvalidCredentials);
    }

    let is_valid = verify_password(&existing_user.password_hash, password)
        .await
        .map_err(|error| PasswordEntryError::PasswordHash(error.to_string()))?;
    if !is_valid {
        return Err(PasswordEntryError::InvalidCredentials);
    }

    Ok(PasswordEntryResult {
        user: AuthUser {
            login_method: AuthLoginMethod::Password,
            ..existing_user.user
        },
        created: false,
    })
}

fn verify_sms_code_format(verify_code: &str) -> Result<(), PhoneAuthError> {
    let verify_code = verify_code.trim();
    if verify_code.len() != SMS_CODE_LENGTH
        || !verify_code
            .chars()
            .all(|character| character.is_ascii_digit())
    {
        return Err(PhoneAuthError::InvalidVerifyCode);
    }

    Ok(())
}

fn normalize_mainland_china_phone_number(
    raw_phone_number: &str,
) -> Result<PhoneNumberSnapshot, PhoneAuthError> {
    let digits = raw_phone_number
        .trim()
        .chars()
        .filter(|character| character.is_ascii_digit())
        .collect::<String>();
    if digits.len() != 11 || !digits.starts_with('1') {
        return Err(PhoneAuthError::InvalidPhoneNumber);
    }

    Ok(PhoneNumberSnapshot {
        e164: format!("+86{digits}"),
        masked_national_number: mask_phone_number(&digits),
    })
}

fn mask_phone_number(phone_number: &str) -> String {
    format!("{}****{}", &phone_number[..3], &phone_number[7..11])
}

fn build_national_phone_number(e164_phone_number: &str) -> Result<String, PhoneAuthError> {
    let digits = e164_phone_number.trim().trim_start_matches('+');
    if let Some(national) = digits.strip_prefix("86")
        && national.len() == 11
    {
        return Ok(national.to_string());
    }
    Err(PhoneAuthError::InvalidPhoneNumber)
}

fn build_random_password_seed() -> String {
    format!(
        "seed_{}_{}",
        new_uuid_simple_string(),
        new_uuid_simple_string()
    )
}

fn build_system_username(prefix: &str, sequence: u64) -> String {
    format!("{prefix}_{sequence:08}")
}

// 公开叙世号是稳定的公开检索键，不替代内部 user_id，仅用于展示、分享与搜索。
fn build_public_user_code(sequence: u64) -> String {
    format!("SY-{sequence:08}")
}

pub fn normalize_public_user_code(input: &str) -> Result<String, PasswordEntryError> {
    let normalized = input
        .trim()
        .chars()
        .filter(|character| character.is_ascii_alphanumeric())
        .collect::<String>()
        .to_ascii_uppercase();
    let digits = normalized.strip_prefix("SY").unwrap_or(&normalized);

    if digits.is_empty()
        || digits.len() > 8
        || !digits.chars().all(|character| character.is_ascii_digit())
    {
        return Err(PasswordEntryError::InvalidPublicUserCode);
    }

    Ok(format!("SY-{digits:0>8}"))
}

fn format_rfc3339(value: OffsetDateTime) -> Result<String, String> {
    format_shared_rfc3339(value)
}

fn parse_phone_code_time(value: &str, field_label: &str) -> Result<OffsetDateTime, PhoneAuthError> {
    parse_rfc3339(value)
        .map_err(|error| PhoneAuthError::Store(format!("短信验证码{field_label}解析失败：{error}")))
}

fn seconds_until(now: OffsetDateTime, target: OffsetDateTime) -> u64 {
    let seconds = target.unix_timestamp().saturating_sub(now.unix_timestamp());
    u64::try_from(seconds.max(1)).unwrap_or(1)
}

fn build_phone_code_key(phone_number: &str, scene: &PhoneAuthScene) -> String {
    format!("{}:{}", phone_number.trim(), scene.as_str())
}

fn create_wechat_state_token() -> String {
    new_uuid_simple_string()
}

fn format_rfc3339_with_context(
    value: OffsetDateTime,
    field_label: &str,
) -> Result<String, RefreshSessionError> {
    format_shared_rfc3339(value)
        .map_err(|error| RefreshSessionError::Store(format!("{field_label}格式化失败：{error}")))
}

fn parse_rfc3339_with_context(
    value: &str,
    field_label: &str,
) -> Result<OffsetDateTime, RefreshSessionError> {
    parse_rfc3339(value)
        .map_err(|error| RefreshSessionError::Store(format!("{field_label}解析失败：{error}")))
}

impl PhoneAuthScene {
    pub fn as_str(&self) -> &'static str {
        match self {
            Self::Login => "login",
            Self::BindPhone => "bind_phone",
            Self::ChangePhone => "change_phone",
            Self::ResetPassword => "reset_password",
        }
    }
}

impl WechatAuthScene {
    pub fn as_str(&self) -> &'static str {
        match self {
            Self::Desktop => "desktop",
            Self::WechatInApp => "wechat_in_app",
        }
    }
}

#[cfg(test)]
mod tests {
    use platform_auth::{
        DEFAULT_SMS_CASE_AUTH_POLICY, DEFAULT_SMS_CODE_LENGTH, DEFAULT_SMS_CODE_TYPE,
        DEFAULT_SMS_COUNTRY_CODE, DEFAULT_SMS_DUPLICATE_POLICY, DEFAULT_SMS_ENDPOINT,
        DEFAULT_SMS_INTERVAL_SECONDS, DEFAULT_SMS_MOCK_VERIFY_CODE, DEFAULT_SMS_TEMPLATE_PARAM_KEY,
        DEFAULT_SMS_VALID_TIME_SECONDS, SmsAuthConfig, SmsAuthProvider, SmsAuthProviderKind,
        hash_refresh_session_token,
    };

    use super::*;

    fn build_store() -> InMemoryAuthStore {
        InMemoryAuthStore::default()
    }

    fn build_password_service(store: InMemoryAuthStore) -> PasswordEntryService {
        PasswordEntryService::new(store)
    }

    fn build_phone_service(store: InMemoryAuthStore) -> PhoneAuthService {
        let sms_provider = SmsAuthProvider::new(
            SmsAuthConfig::new(
                SmsAuthProviderKind::Mock,
                DEFAULT_SMS_ENDPOINT.to_string(),
                None,
                None,
                String::new(),
                String::new(),
                DEFAULT_SMS_TEMPLATE_PARAM_KEY.to_string(),
                DEFAULT_SMS_COUNTRY_CODE.to_string(),
                None,
                DEFAULT_SMS_CODE_LENGTH,
                DEFAULT_SMS_CODE_TYPE,
                DEFAULT_SMS_VALID_TIME_SECONDS,
                DEFAULT_SMS_INTERVAL_SECONDS,
                DEFAULT_SMS_DUPLICATE_POLICY,
                DEFAULT_SMS_CASE_AUTH_POLICY,
                false,
                DEFAULT_SMS_MOCK_VERIFY_CODE.to_string(),
            )
            .expect("mock sms config should be valid"),
        )
        .expect("mock sms provider should be valid");
        PhoneAuthService::new(store, sms_provider)
    }

    fn build_refresh_service(store: InMemoryAuthStore) -> RefreshSessionService {
        RefreshSessionService::new(store, 30)
    }

    fn build_user_service(store: InMemoryAuthStore) -> AuthUserService {
        AuthUserService::new(store)
    }

    fn build_client_info() -> RefreshSessionClientInfo {
        RefreshSessionClientInfo {
            client_type: "web_browser".to_string(),
            client_runtime: "chrome".to_string(),
            client_platform: "windows".to_string(),
            client_instance_id: Some("client-instance-001".to_string()),
            device_fingerprint: Some("device-fingerprint-001".to_string()),
            device_display_name: "Windows / Chrome".to_string(),
            mini_program_app_id: None,
            mini_program_env: None,
            user_agent: Some("Mozilla/5.0".to_string()),
            ip: Some("203.0.113.10".to_string()),
        }
    }

    async fn create_phone_login_user(store: InMemoryAuthStore, phone_number: &str) -> AuthUser {
        let phone_service = build_phone_service(store);
        let now = OffsetDateTime::now_utc();
        phone_service
            .send_code(
                SendPhoneCodeInput {
                    phone_number: phone_number.to_string(),
                    scene: PhoneAuthScene::Login,
                },
                now,
            )
            .await
            .expect("phone code should send");
        phone_service
            .login(
                PhoneLoginInput {
                    phone_number: phone_number.to_string(),
                    verify_code: "123456".to_string(),
                },
                now + Duration::seconds(1),
            )
            .await
            .expect("phone login should create user")
            .user
    }

    #[tokio::test]
    async fn password_entry_rejects_unknown_user_without_registration() {
        let service = build_password_service(build_store());

        let error = service
            .execute(PasswordEntryInput {
                phone_number: "13800138000".to_string(),
                password: "secret123".to_string(),
            })
            .await
            .expect_err("password login must not create user");

        assert_eq!(error, PasswordEntryError::InvalidCredentials);
    }

    #[tokio::test]
    async fn phone_user_can_set_password_then_login() {
        let store = build_store();
        let user = create_phone_login_user(store.clone(), "13800138000").await;
        let service = build_password_service(store);

        service
            .change_password(ChangePasswordInput {
                user_id: user.id.clone(),
                current_password: None,
                new_password: "secret123".to_string(),
            })
            .await
            .expect("phone user should set first password");
        let result = service
            .execute(PasswordEntryInput {
                phone_number: "13800138000".to_string(),
                password: "secret123".to_string(),
            })
            .await
            .expect("password login should succeed after setting password");

        assert!(!result.created);
        assert_eq!(result.user.id, user.id);
        assert_eq!(result.user.login_method, AuthLoginMethod::Password);
    }

    #[tokio::test]
    async fn password_entry_rejects_wrong_password_after_set() {
        let store = build_store();
        let user = create_phone_login_user(store.clone(), "13800138001").await;
        let service = build_password_service(store);
        service
            .change_password(ChangePasswordInput {
                user_id: user.id.clone(),
                current_password: None,
                new_password: "secret123".to_string(),
            })
            .await
            .expect("password should set");

        let error = service
            .execute(PasswordEntryInput {
                phone_number: "13800138001".to_string(),
                password: "secret999".to_string(),
            })
            .await
            .expect_err("wrong password should fail");

        assert_eq!(error, PasswordEntryError::InvalidCredentials);
    }

    #[tokio::test]
    async fn reset_password_requires_existing_phone_user() {
        let store = build_store();
        let phone_service = build_phone_service(store.clone());
        let now = OffsetDateTime::now_utc();
        phone_service
            .send_code(
                SendPhoneCodeInput {
                    phone_number: "13800138002".to_string(),
                    scene: PhoneAuthScene::ResetPassword,
                },
                now,
            )
            .await
            .expect("reset code should send");

        let error = phone_service
            .reset_password(
                ResetPasswordInput {
                    phone_number: "13800138002".to_string(),
                    verify_code: "123456".to_string(),
                    new_password: "secret123".to_string(),
                },
                now + Duration::seconds(1),
            )
            .await
            .expect_err("unknown phone must not register by reset");

        assert_eq!(error, PhoneAuthError::UserNotFound);
    }

    #[tokio::test]
    async fn persistent_store_restores_user_and_refresh_session_after_restart() {
        let store_path = std::env::temp_dir().join(format!(
            "genarrative-auth-store-{}.json",
            new_uuid_simple_string()
        ));
        let _ = std::fs::remove_file(&store_path);

        let store = InMemoryAuthStore::from_persistence_path(store_path.clone())
            .expect("persistent store should initialize");
        let user = create_phone_login_user(store.clone(), "13800138003").await;
        let password_service = build_password_service(store.clone());
        let refresh_service = build_refresh_service(store.clone());
        password_service
            .change_password(ChangePasswordInput {
                user_id: user.id.clone(),
                current_password: None,
                new_password: "secret123".to_string(),
            })
            .await
            .expect("password should set before persistence check");
        refresh_service
            .create_session(
                CreateRefreshSessionInput {
                    user_id: user.id.clone(),
                    refresh_token_hash: hash_refresh_session_token("persist-token-01"),
                    issued_by_provider: AuthLoginMethod::Password,
                    client_info: build_client_info(),
                },
                OffsetDateTime::now_utc(),
            )
            .expect("refresh session should be persisted");
        drop(store);

        let restored_store = InMemoryAuthStore::from_persistence_path(store_path.clone())
            .expect("persistent store should restore");
        let restored_user = build_password_service(restored_store.clone())
            .get_user_by_id(&user.id)
            .expect("restored user query should succeed")
            .expect("restored user should exist")
            .user;
        assert_eq!(restored_user.username, user.username);

        let rotated = build_refresh_service(restored_store)
            .rotate_session(
                RotateRefreshSessionInput {
                    refresh_token_hash: hash_refresh_session_token("persist-token-01"),
                    next_refresh_token_hash: hash_refresh_session_token("persist-token-02"),
                },
                OffsetDateTime::now_utc(),
            )
            .expect("restored refresh session should rotate");
        assert_eq!(rotated.user.id, user.id);

        let _ = std::fs::remove_file(&store_path);
    }

    #[tokio::test]
    async fn password_entry_rejects_email_or_username_identifier() {
        let service = build_password_service(build_store());

        let error = service
            .execute(PasswordEntryInput {
                phone_number: "user@example.com".to_string(),
                password: "secret123".to_string(),
            })
            .await
            .expect_err("email should fail");

        assert_eq!(error, PasswordEntryError::InvalidPhoneNumber);
    }

    #[tokio::test]
    async fn phone_send_code_rejects_same_scene_during_cooldown() {
        let service = build_phone_service(build_store());
        let now = OffsetDateTime::now_utc();

        service
            .send_code(
                SendPhoneCodeInput {
                    phone_number: "13800138000".to_string(),
                    scene: PhoneAuthScene::Login,
                },
                now,
            )
            .await
            .expect("first phone code should send");

        let error = service
            .send_code(
                SendPhoneCodeInput {
                    phone_number: "13800138000".to_string(),
                    scene: PhoneAuthScene::Login,
                },
                now + Duration::seconds(10),
            )
            .await
            .expect_err("same scene send should be cooled down");

        match error {
            PhoneAuthError::SendCoolingDown {
                retry_after_seconds,
            } => assert!((1..=SMS_CODE_COOLDOWN_SECONDS).contains(&retry_after_seconds)),
            other => panic!("unexpected phone auth error: {other:?}"),
        }
    }

    #[tokio::test]
    async fn phone_send_code_keeps_different_scenes_isolated() {
        let service = build_phone_service(build_store());
        let now = OffsetDateTime::now_utc();

        service
            .send_code(
                SendPhoneCodeInput {
                    phone_number: "13800138000".to_string(),
                    scene: PhoneAuthScene::Login,
                },
                now,
            )
            .await
            .expect("login scene code should send");
        let bind_result = service.send_code(
            SendPhoneCodeInput {
                phone_number: "13800138000".to_string(),
                scene: PhoneAuthScene::BindPhone,
            },
            now + Duration::seconds(1),
        );

        assert!(bind_result.await.is_ok());
    }

    #[tokio::test]
    async fn phone_login_expires_code_after_too_many_wrong_attempts() {
        let service = build_phone_service(build_store());
        let now = OffsetDateTime::now_utc();

        service
            .send_code(
                SendPhoneCodeInput {
                    phone_number: "13800138000".to_string(),
                    scene: PhoneAuthScene::Login,
                },
                now,
            )
            .await
            .expect("phone code should send");

        for attempt in 1..SMS_CODE_MAX_FAILED_ATTEMPTS {
            let error = service
                .login(
                    PhoneLoginInput {
                        phone_number: "13800138000".to_string(),
                        verify_code: "000000".to_string(),
                    },
                    now + Duration::seconds(i64::from(attempt)),
                )
                .await
                .expect_err("wrong code should fail before limit");
            assert_eq!(error, PhoneAuthError::InvalidVerifyCode);
        }

        let exhausted_error = service
            .login(
                PhoneLoginInput {
                    phone_number: "13800138000".to_string(),
                    verify_code: "000000".to_string(),
                },
                now + Duration::seconds(i64::from(SMS_CODE_MAX_FAILED_ATTEMPTS)),
            )
            .await
            .expect_err("fifth wrong code should exhaust the snapshot");
        assert_eq!(exhausted_error, PhoneAuthError::VerifyAttemptsExceeded);

        let missing_error = service
            .login(
                PhoneLoginInput {
                    phone_number: "13800138000".to_string(),
                    verify_code: DEFAULT_SMS_MOCK_VERIFY_CODE.to_string(),
                },
                now + Duration::seconds(i64::from(SMS_CODE_MAX_FAILED_ATTEMPTS + 1)),
            )
            .await
            .expect_err("exhausted snapshot should be deleted");
        assert_eq!(missing_error, PhoneAuthError::VerifyCodeNotFound);

        service
            .send_code(
                SendPhoneCodeInput {
                    phone_number: "13800138000".to_string(),
                    scene: PhoneAuthScene::Login,
                },
                now + Duration::seconds(i64::from(SMS_CODE_MAX_FAILED_ATTEMPTS + 2)),
            )
            .await
            .expect("deleted snapshot should allow a new code");
        let login = service
            .login(
                PhoneLoginInput {
                    phone_number: "13800138000".to_string(),
                    verify_code: DEFAULT_SMS_MOCK_VERIFY_CODE.to_string(),
                },
                now + Duration::seconds(i64::from(SMS_CODE_MAX_FAILED_ATTEMPTS + 3)),
            )
            .await
            .expect("new code should login");

        assert!(login.created);
        assert_eq!(login.user.login_method, AuthLoginMethod::Phone);
    }

    #[tokio::test]
    async fn refresh_session_creation_and_rotation_keep_same_session_id() {
        let store = build_store();
        let user = create_phone_login_user(store.clone(), "13800138004").await;
        let refresh_service = build_refresh_service(store);
        let now = OffsetDateTime::now_utc();
        let first_token_hash = hash_refresh_session_token("refresh-token-01");
        let created = refresh_service
            .create_session(
                CreateRefreshSessionInput {
                    user_id: user.id.clone(),
                    refresh_token_hash: first_token_hash.clone(),
                    issued_by_provider: AuthLoginMethod::Password,
                    client_info: build_client_info(),
                },
                now,
            )
            .expect("session should create");

        let rotated = refresh_service
            .rotate_session(
                RotateRefreshSessionInput {
                    refresh_token_hash: first_token_hash,
                    next_refresh_token_hash: hash_refresh_session_token("refresh-token-02"),
                },
                now + Duration::minutes(10),
            )
            .expect("session should rotate");

        assert_eq!(rotated.user.id, user.id);
        assert_eq!(rotated.session.session_id, created.session.session_id);
        assert_ne!(
            rotated.session.refresh_token_hash,
            created.session.refresh_token_hash
        );
    }

    #[tokio::test]
    async fn refresh_session_rejects_unknown_token_hash() {
        let store = build_store();
        let refresh_service = build_refresh_service(store);

        let error = refresh_service
            .rotate_session(
                RotateRefreshSessionInput {
                    refresh_token_hash: hash_refresh_session_token("missing"),
                    next_refresh_token_hash: hash_refresh_session_token("next"),
                },
                OffsetDateTime::now_utc(),
            )
            .expect_err("unknown token should fail");

        assert_eq!(error, RefreshSessionError::SessionNotFound);
    }

    #[tokio::test]
    async fn logout_current_session_revokes_session_and_increments_token_version() {
        let store = build_store();
        let user = create_phone_login_user(store.clone(), "13800138005").await;
        let refresh_service = build_refresh_service(store.clone());
        let user_service = build_user_service(store);
        let refresh_token_hash = hash_refresh_session_token("logout-token");
        refresh_service
            .create_session(
                CreateRefreshSessionInput {
                    user_id: user.id.clone(),
                    refresh_token_hash: refresh_token_hash.clone(),
                    issued_by_provider: AuthLoginMethod::Password,
                    client_info: build_client_info(),
                },
                OffsetDateTime::now_utc(),
            )
            .expect("session should create");

        let result = user_service
            .logout_current_session(
                LogoutCurrentSessionInput {
                    user_id: user.id.clone(),
                    refresh_token_hash: Some(refresh_token_hash.clone()),
                },
                OffsetDateTime::now_utc(),
            )
            .expect("logout should succeed");

        assert_eq!(result.user.token_version, 2);

        let refresh_error = refresh_service
            .rotate_session(
                RotateRefreshSessionInput {
                    refresh_token_hash,
                    next_refresh_token_hash: hash_refresh_session_token("logout-token-next"),
                },
                OffsetDateTime::now_utc(),
            )
            .expect_err("revoked session should fail");
        assert_eq!(refresh_error, RefreshSessionError::SessionNotFound);
    }

    #[tokio::test]
    async fn logout_all_sessions_revokes_all_sessions_and_increments_token_version_once() {
        let store = build_store();
        let user = create_phone_login_user(store.clone(), "13800138006").await;
        let refresh_service = build_refresh_service(store.clone());
        let user_service = build_user_service(store);
        let first_refresh_token_hash = hash_refresh_session_token("logout-all-token-01");
        let second_refresh_token_hash = hash_refresh_session_token("logout-all-token-02");
        let now = OffsetDateTime::now_utc();

        refresh_service
            .create_session(
                CreateRefreshSessionInput {
                    user_id: user.id.clone(),
                    refresh_token_hash: first_refresh_token_hash.clone(),
                    issued_by_provider: AuthLoginMethod::Password,
                    client_info: build_client_info(),
                },
                now,
            )
            .expect("first session should create");
        refresh_service
            .create_session(
                CreateRefreshSessionInput {
                    user_id: user.id.clone(),
                    refresh_token_hash: second_refresh_token_hash.clone(),
                    issued_by_provider: AuthLoginMethod::Password,
                    client_info: RefreshSessionClientInfo {
                        client_runtime: "firefox".to_string(),
                        device_display_name: "Windows / Firefox".to_string(),
                        ..build_client_info()
                    },
                },
                now + Duration::seconds(1),
            )
            .expect("second session should create");

        let result = user_service
            .logout_all_sessions(
                LogoutAllSessionsInput {
                    user_id: user.id.clone(),
                },
                now + Duration::minutes(1),
            )
            .expect("logout all should succeed");

        assert_eq!(result.user.token_version, 2);
        assert_eq!(
            refresh_service
                .list_active_sessions_by_user(&user.id, now + Duration::minutes(2))
                .expect("sessions should list")
                .sessions
                .len(),
            0
        );

        let first_refresh_error = refresh_service
            .rotate_session(
                RotateRefreshSessionInput {
                    refresh_token_hash: first_refresh_token_hash,
                    next_refresh_token_hash: hash_refresh_session_token("logout-all-token-03"),
                },
                now + Duration::minutes(2),
            )
            .expect_err("first revoked session should fail");
        assert_eq!(first_refresh_error, RefreshSessionError::SessionNotFound);

        let second_refresh_error = refresh_service
            .rotate_session(
                RotateRefreshSessionInput {
                    refresh_token_hash: second_refresh_token_hash,
                    next_refresh_token_hash: hash_refresh_session_token("logout-all-token-04"),
                },
                now + Duration::minutes(2),
            )
            .expect_err("second revoked session should fail");
        assert_eq!(second_refresh_error, RefreshSessionError::SessionNotFound);
    }

    #[tokio::test]
    async fn list_active_sessions_by_user_filters_revoked_and_expired_sessions() {
        let store = build_store();
        let refresh_service = build_refresh_service(store.clone());
        let user = create_phone_login_user(store.clone(), "13800138007").await;
        let now = OffsetDateTime::now_utc();

        let active_session = refresh_service
            .create_session(
                CreateRefreshSessionInput {
                    user_id: user.id.clone(),
                    refresh_token_hash: hash_refresh_session_token("sessions-active"),
                    issued_by_provider: AuthLoginMethod::Password,
                    client_info: build_client_info(),
                },
                now,
            )
            .expect("active session should create");

        refresh_service
            .create_session(
                CreateRefreshSessionInput {
                    user_id: user.id.clone(),
                    refresh_token_hash: hash_refresh_session_token("sessions-revoked"),
                    issued_by_provider: AuthLoginMethod::Password,
                    client_info: RefreshSessionClientInfo {
                        client_runtime: "edge".to_string(),
                        device_display_name: "Windows / Edge".to_string(),
                        ..build_client_info()
                    },
                },
                now - Duration::minutes(5),
            )
            .expect("revoked session should create");
        store
            .revoke_session_by_refresh_token_hash(
                &hash_refresh_session_token("sessions-revoked"),
                now - Duration::minutes(1),
            )
            .expect("revoked session should revoke");

        refresh_service
            .create_session(
                CreateRefreshSessionInput {
                    user_id: user.id.clone(),
                    refresh_token_hash: hash_refresh_session_token("sessions-expired"),
                    issued_by_provider: AuthLoginMethod::Password,
                    client_info: RefreshSessionClientInfo {
                        client_runtime: "firefox".to_string(),
                        device_display_name: "Windows / Firefox".to_string(),
                        ..build_client_info()
                    },
                },
                now - Duration::days(40),
            )
            .expect("expired session should create");

        let listed = refresh_service
            .list_active_sessions_by_user(&user.id, now)
            .expect("sessions should list");

        assert_eq!(listed.sessions.len(), 1);
        assert_eq!(
            listed.sessions[0].session_id,
            active_session.session.session_id
        );
        assert_eq!(listed.sessions[0].client_info.client_runtime, "chrome");
        assert_eq!(
            listed.sessions[0].client_info.device_display_name,
            "Windows / Chrome"
        );
    }

    #[tokio::test]
    async fn wechat_login_hits_existing_user_by_union_id_before_openid() {
        let store = build_store();
        let phone_service = build_phone_service(store.clone());
        let wechat_service = WechatAuthService::new(store);
        let now = OffsetDateTime::now_utc();

        phone_service
            .send_code(
                SendPhoneCodeInput {
                    phone_number: "13800138000".to_string(),
                    scene: PhoneAuthScene::Login,
                },
                now,
            )
            .await
            .expect("phone code should send");
        let phone_user = phone_service
            .login(
                PhoneLoginInput {
                    phone_number: "13800138000".to_string(),
                    verify_code: "123456".to_string(),
                },
                now + Duration::seconds(1),
            )
            .await
            .expect("phone login should succeed")
            .user;

        let first_wechat = wechat_service
            .resolve_login(ResolveWechatLoginInput {
                profile: WechatIdentityProfile {
                    provider_uid: "wx-openid-first".to_string(),
                    provider_union_id: Some("wx-union-shared".to_string()),
                    display_name: Some("微信旅人甲".to_string()),
                    avatar_url: None,
                },
            })
            .await
            .expect("first wechat login should succeed");

        assert!(first_wechat.created);
        assert_eq!(
            first_wechat.user.binding_status,
            AuthBindingStatus::PendingBindPhone
        );

        let second_wechat = wechat_service
            .resolve_login(ResolveWechatLoginInput {
                profile: WechatIdentityProfile {
                    provider_uid: "wx-openid-second".to_string(),
                    provider_union_id: Some("wx-union-shared".to_string()),
                    display_name: Some("微信旅人乙".to_string()),
                    avatar_url: None,
                },
            })
            .await
            .expect("second wechat login should succeed");

        assert!(!second_wechat.created);
        assert_eq!(second_wechat.user.id, first_wechat.user.id);
        assert_ne!(second_wechat.user.id, phone_user.id);
        assert_eq!(second_wechat.user.login_method, AuthLoginMethod::Wechat);
    }

    #[tokio::test]
    async fn bind_wechat_phone_merges_pending_wechat_user_into_existing_phone_user() {
        let store = build_store();
        let phone_service = build_phone_service(store.clone());
        let wechat_service = WechatAuthService::new(store.clone());
        let now = OffsetDateTime::now_utc();

        phone_service
            .send_code(
                SendPhoneCodeInput {
                    phone_number: "13800138000".to_string(),
                    scene: PhoneAuthScene::Login,
                },
                now,
            )
            .await
            .expect("phone login code should send");
        let phone_user = phone_service
            .login(
                PhoneLoginInput {
                    phone_number: "13800138000".to_string(),
                    verify_code: "123456".to_string(),
                },
                now + Duration::seconds(1),
            )
            .await
            .expect("phone login should succeed")
            .user;

        let wechat_user = wechat_service
            .resolve_login(ResolveWechatLoginInput {
                profile: WechatIdentityProfile {
                    provider_uid: "wx-openid-bind".to_string(),
                    provider_union_id: Some("wx-union-bind".to_string()),
                    display_name: Some("待绑定微信用户".to_string()),
                    avatar_url: None,
                },
            })
            .await
            .expect("wechat login should succeed")
            .user;

        assert_eq!(
            wechat_user.binding_status,
            AuthBindingStatus::PendingBindPhone
        );
        assert_ne!(wechat_user.id, phone_user.id);

        phone_service
            .send_code(
                SendPhoneCodeInput {
                    phone_number: "13800138000".to_string(),
                    scene: PhoneAuthScene::BindPhone,
                },
                now + Duration::seconds(2),
            )
            .await
            .expect("bind phone code should send");
        let merged = phone_service
            .bind_wechat_phone(
                BindWechatPhoneInput {
                    user_id: wechat_user.id.clone(),
                    phone_number: "13800138000".to_string(),
                    verify_code: "123456".to_string(),
                },
                now + Duration::seconds(3),
            )
            .await
            .expect("bind phone should succeed");

        assert_eq!(merged.user.id, phone_user.id);
        assert_eq!(merged.user.binding_status, AuthBindingStatus::Active);
        assert!(merged.user.wechat_bound);

        let reused_wechat_user = wechat_service
            .resolve_login(ResolveWechatLoginInput {
                profile: WechatIdentityProfile {
                    provider_uid: "wx-openid-bind".to_string(),
                    provider_union_id: Some("wx-union-bind".to_string()),
                    display_name: Some("已归并微信用户".to_string()),
                    avatar_url: None,
                },
            })
            .await
            .expect("wechat login should reuse merged user");

        assert!(!reused_wechat_user.created);
        assert_eq!(reused_wechat_user.user.id, phone_user.id);
        assert!(reused_wechat_user.user.wechat_bound);
    }
}