import type {
  AuthAuditLogEntry,
  AuthAuditLogsResponse,
  AuthCaptchaChallenge,
  AuthEntryResponse,
  AuthLiftRiskBlockResponse,
  AuthLoginMethod,
  AuthLoginOptionsResponse,
  AuthLogoutAllResponse,
  AuthMeResponse,
  AuthPasswordChangeResponse,
  AuthPasswordResetResponse,
  AuthPhoneChangeResponse,
  AuthPhoneLoginResponse,
  AuthPhoneSendCodeResponse,
  AuthRevokeSessionResponse,
  AuthRiskBlocksResponse,
  AuthRiskBlockSummary,
  AuthSessionsResponse,
  AuthSessionSummary,
  AuthUser,
  AuthWechatBindPhoneResponse,
  AuthWechatStartResponse,
  LogoutResponse,
  PublicUserSearchResponse,
} from '../../packages/shared/src/contracts/auth';
import {
  ApiClientError,
  type ApiRequestOptions,
  clearStoredAccessToken,
  emitAuthStateChange,
  requestJson,
  setStoredAccessToken,
} from './apiClient';

export type { AuthUser } from '../../packages/shared/src/contracts/auth';
export type { AuthLoginMethod } from '../../packages/shared/src/contracts/auth';

export type AuthSessionSnapshot = {
  user: import('../../packages/shared/src/contracts/auth').AuthUser | null;
  availableLoginMethods: AuthLoginMethod[];
};
export type { AuthSessionSummary };
export type { AuthCaptchaChallenge };
export type { AuthAuditLogEntry };
export type { AuthRiskBlockSummary };

export type ConsumedAuthCallback = {
  provider: 'wechat' | 'unknown';
  bindingStatus: string | null;
  error: string | null;
};

// 登录前公开认证入口不能误带旧 token，也不能先触发 refresh 探测，
// 否则无会话用户点击“获取验证码”时会先打出一条无意义的 /auth/refresh 401。
const PUBLIC_AUTH_REQUEST_OPTIONS = {
  skipAuth: true,
  skipRefresh: true,
} satisfies ApiRequestOptions;

const LAST_LOGIN_PHONE_STORAGE_KEY = 'genarrative:last-login-phone';

export function normalizePhoneInput(phoneInput: string) {
  return phoneInput.replace(/[^\d+]/gu, '').trim();
}

export function getStoredLastLoginPhone() {
  if (typeof window === 'undefined') {
    return '';
  }

  return window.localStorage.getItem(LAST_LOGIN_PHONE_STORAGE_KEY) ?? '';
}

export function setStoredLastLoginPhone(phone: string) {
  if (typeof window === 'undefined') {
    return;
  }

  const normalizedPhone = normalizePhoneInput(phone);
  if (!normalizedPhone) {
    return;
  }

  window.localStorage.setItem(LAST_LOGIN_PHONE_STORAGE_KEY, normalizedPhone);
}

export function getCaptchaChallengeFromError(
  error: unknown,
): AuthCaptchaChallenge | null {
  if (
    error instanceof ApiClientError &&
    error.code === 'CAPTCHA_REQUIRED' &&
    error.details &&
    typeof error.details === 'object' &&
    'captchaChallenge' in error.details
  ) {
    const challenge = (error.details as { captchaChallenge?: unknown })
      .captchaChallenge;
    if (
      challenge &&
      typeof challenge === 'object' &&
      'challengeId' in challenge &&
      'promptText' in challenge &&
      'imageDataUrl' in challenge &&
      'expiresInSeconds' in challenge
    ) {
      return challenge as AuthCaptchaChallenge;
    }
  }

  return null;
}

export function clearAuthSession() {
  clearStoredAccessToken({ emit: false });
  emitAuthStateChange();
}

export async function sendPhoneLoginCode(
  phone: string,
  scene: 'login' | 'bind_phone' | 'change_phone' | 'reset_password' = 'login',
  captcha?: {
    challengeId?: string;
    answer?: string;
  },
) {
  const response = await requestJson<AuthPhoneSendCodeResponse>(
    '/api/auth/phone/send-code',
    {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        phone: normalizePhoneInput(phone),
        scene,
        captchaChallengeId: captcha?.challengeId?.trim() || undefined,
        captchaAnswer: captcha?.answer?.trim() || undefined,
      }),
    },
    '发送验证码失败',
    PUBLIC_AUTH_REQUEST_OPTIONS,
  );

  return response;
}

export async function loginWithPhoneCode(phone: string, code: string) {
  const response = await requestJson<AuthPhoneLoginResponse>(
    '/api/auth/phone/login',
    {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        phone: normalizePhoneInput(phone),
        code: code.trim(),
      }),
    },
    '登录失败',
    PUBLIC_AUTH_REQUEST_OPTIONS,
  );

  setStoredAccessToken(response.token, { emit: false });
  return response.user;
}

export async function bindWechatPhone(phone: string, code: string) {
  const response = await requestJson<AuthWechatBindPhoneResponse>(
    '/api/auth/wechat/bind-phone',
    {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        phone: normalizePhoneInput(phone),
        code: code.trim(),
      }),
    },
    '绑定手机号失败',
  );

  setStoredAccessToken(response.token, { emit: false });
  return response.user;
}

export async function changePhoneNumber(phone: string, code: string) {
  const response = await requestJson<AuthPhoneChangeResponse>(
    '/api/auth/phone/change',
    {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        phone: normalizePhoneInput(phone),
        code: code.trim(),
      }),
    },
    '更换手机号失败',
  );

  return response.user;
}

export async function startWechatLogin() {
  const response = await requestJson<AuthWechatStartResponse>(
    `/api/auth/wechat/start?redirectPath=${encodeURIComponent(window.location.pathname)}`,
    {
      method: 'GET',
    },
    '微信登录暂不可用',
    PUBLIC_AUTH_REQUEST_OPTIONS,
  );

  window.location.assign(response.authorizationUrl);
}

export async function getAuthLoginOptions() {
  return requestJson<AuthLoginOptionsResponse>(
    '/api/auth/login-options',
    {
      method: 'GET',
    },
    '读取登录方式失败',
    PUBLIC_AUTH_REQUEST_OPTIONS,
  );
}

export async function authEntry(phone: string, password: string) {
  const response = await requestJson<AuthEntryResponse>(
    '/api/auth/entry',
    {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        phone: normalizePhoneInput(phone),
        password: password.trim(),
      }),
    },
    '登录失败',
    PUBLIC_AUTH_REQUEST_OPTIONS,
  );

  setStoredAccessToken(response.token, { emit: false });
  return response.user;
}

export async function changePassword(
  currentPassword: string,
  newPassword: string,
) {
  const response = await requestJson<AuthPasswordChangeResponse>(
    '/api/auth/password/change',
    {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        currentPassword: currentPassword.trim() || undefined,
        newPassword: newPassword.trim(),
      }),
    },
    '修改密码失败',
  );

  return response.user;
}

export async function resetPassword(
  phone: string,
  code: string,
  newPassword: string,
) {
  const response = await requestJson<AuthPasswordResetResponse>(
    '/api/auth/password/reset',
    {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        phone: normalizePhoneInput(phone),
        code: code.trim(),
        newPassword: newPassword.trim(),
      }),
    },
    '重置密码失败',
    PUBLIC_AUTH_REQUEST_OPTIONS,
  );

  setStoredAccessToken(response.token, { emit: false });
  return response.user;
}

export function consumeAuthCallbackResult(): ConsumedAuthCallback | null {
  if (typeof window === 'undefined') {
    return null;
  }

  const hash = window.location.hash.startsWith('#')
    ? window.location.hash.slice(1)
    : window.location.hash;
  if (!hash) {
    return null;
  }

  const params = new URLSearchParams(hash);
  const authToken = params.get('auth_token');
  const authError = params.get('auth_error');
  const providerValue = params.get('auth_provider');
  const bindingStatus = params.get('auth_binding_status');

  if (!authToken && !authError) {
    return null;
  }

  if (authToken) {
    setStoredAccessToken(authToken, { emit: false });
  }

  if (typeof window.history?.replaceState === 'function') {
    window.history.replaceState(
      null,
      '',
      `${window.location.pathname}${window.location.search}`,
    );
  }

  return {
    provider: providerValue === 'wechat' ? 'wechat' : 'unknown',
    bindingStatus,
    error: authError,
  };
}

export async function getCurrentAuthUser(): Promise<AuthSessionSnapshot> {
  const response = await requestJson<AuthMeResponse>(
    '/api/auth/me',
    {
      method: 'GET',
    },
    '读取当前用户失败',
    {
      // 会话恢复阶段允许 401 作为“未登录”信号，不应再广播一次全局鉴权事件。
      notifyAuthStateChange: false,
    },
  );

  return {
    user: response.user,
    availableLoginMethods: response.availableLoginMethods,
  };
}

export async function getPublicAuthUserByCode(code: string) {
  const response = await requestJson<PublicUserSearchResponse>(
    `/api/auth/public-users/by-code/${encodeURIComponent(code.trim())}`,
    {
      method: 'GET',
    },
    '读取用户信息失败',
    PUBLIC_AUTH_REQUEST_OPTIONS,
  );

  return response.user;
}

export async function getPublicAuthUserById(userId: string) {
  const response = await requestJson<PublicUserSearchResponse>(
    `/api/auth/public-users/by-id/${encodeURIComponent(userId.trim())}`,
    {
      method: 'GET',
    },
    '读取用户信息失败',
    PUBLIC_AUTH_REQUEST_OPTIONS,
  );

  return response.user;
}

export async function getAuthSessions() {
  const response = await requestJson<AuthSessionsResponse>(
    '/api/auth/sessions',
    {
      method: 'GET',
    },
    '读取登录设备失败',
  );

  return response.sessions;
}

export async function revokeAuthSession(sessionId: string) {
  await requestJson<AuthRevokeSessionResponse>(
    `/api/auth/sessions/${encodeURIComponent(sessionId)}/revoke`,
    {
      method: 'POST',
    },
    '移除登录设备失败',
  );
}

export async function getAuthAuditLogs() {
  const response = await requestJson<AuthAuditLogsResponse>(
    '/api/auth/audit-logs',
    {
      method: 'GET',
    },
    '读取账号操作记录失败',
  );

  return response.logs;
}

export async function getAuthRiskBlocks() {
  const response = await requestJson<AuthRiskBlocksResponse>(
    '/api/auth/risk-blocks',
    {
      method: 'GET',
    },
    '读取安全状态失败',
  );

  return response.blocks;
}

export async function liftAuthRiskBlock(scopeType: 'phone' | 'ip') {
  await requestJson<AuthLiftRiskBlockResponse>(
    `/api/auth/risk-blocks/${encodeURIComponent(scopeType)}/lift`,
    {
      method: 'POST',
    },
    '解除保护失败',
  );
}

export async function logoutAuthUser() {
  try {
    await requestJson<LogoutResponse>(
      '/api/auth/logout',
      {
        method: 'POST',
      },
      '退出登录失败',
    );
  } finally {
    clearAuthSession();
  }
}

export async function logoutAllAuthSessions() {
  try {
    await requestJson<AuthLogoutAllResponse>(
      '/api/auth/logout-all',
      {
        method: 'POST',
      },
      '退出全部设备失败',
    );
  } finally {
    clearAuthSession();
  }
}