import type {
  AdminDebugHttpRequest,
  AdminDebugHttpResponse,
  AdminDisableProfileRedeemCodeRequest,
  AdminDisableProfileTaskConfigRequest,
  AdminDatabaseTableListResponse,
  AdminDatabaseTableRowsQuery,
  AdminDatabaseTableRowsResponse,
  AdminLoginResponse,
  AdminMeResponse,
  AdminOverviewResponse,
  AdminTrackingEventListQuery,
  AdminTrackingEventListResponse,
  AdminUpsertProfileInviteCodeRequest,
  AdminUpsertProfileRedeemCodeRequest,
  AdminUpsertProfileTaskConfigRequest,
  ApiErrorEnvelope,
  ApiMeta,
  ApiSuccessEnvelope,
  ProfileInviteCodeAdminListResponse,
  ProfileInviteCodeAdminResponse,
  ProfileRedeemCodeAdminListResponse,
  ProfileRedeemCodeAdminResponse,
  ProfileTaskConfigAdminListResponse,
  ProfileTaskConfigAdminResponse,
} from './adminApiTypes';

const API_RESPONSE_ENVELOPE_HEADER = 'x-genarrative-response-envelope';
const ADMIN_API_BASE_URL = normalizeBaseUrl(
  import.meta.env.VITE_ADMIN_API_BASE_URL ?? '',
);

interface AdminRequestOptions {
  method?: string;
  token?: string;
  body?: unknown;
  headers?: Record<string, string>;
  signal?: AbortSignal;
}

export class AdminApiError extends Error {
  status: number;
  code: string;
  details: Record<string, unknown> | null;
  meta: ApiMeta | null;
  responseText: string;

  constructor(params: {
    message: string;
    status: number;
    code?: string;
    details?: Record<string, unknown> | null;
    meta?: ApiMeta | null;
    responseText?: string;
  }) {
    super(params.message);
    this.name = 'AdminApiError';
    this.status = params.status;
    this.code = params.code ?? 'ADMIN_API_ERROR';
    this.details = params.details ?? null;
    this.meta = params.meta ?? null;
    this.responseText = params.responseText ?? '';
  }
}

export function isAdminApiError(error: unknown): error is AdminApiError {
  return error instanceof AdminApiError;
}

export function formatAdminApiError(error: unknown) {
  if (isAdminApiError(error)) {
    return error.message;
  }

  if (error instanceof Error && error.message.trim()) {
    return error.message;
  }

  return '请求失败';
}

export async function request<T>(
  path: string,
  options: AdminRequestOptions = {},
): Promise<T> {
  const method = options.method ?? 'GET';
  const headers: Record<string, string> = {
    Accept: 'application/json',
    [API_RESPONSE_ENVELOPE_HEADER]: 'v1',
    ...(options.headers ?? {}),
  };

  const token = options.token?.trim();
  if (token) {
    headers.Authorization = `Bearer ${token}`;
  }

  const init: RequestInit = {
    method,
    headers,
    signal: options.signal,
  };

  if (typeof options.body !== 'undefined') {
    headers['Content-Type'] = 'application/json';
    init.body = JSON.stringify(options.body);
  }

  const response = await fetch(buildRequestUrl(path), init);
  const responseText = await response.text();
  const payload = parseJsonResponse(responseText);

  if (!response.ok) {
    throw buildAdminApiError(response, payload, responseText);
  }

  return unwrapSuccessPayload<T>(payload);
}

export function loginAdmin(username: string, password: string) {
  return request<AdminLoginResponse>('/admin/api/login', {
    method: 'POST',
    body: {username, password},
  });
}

export function getAdminMe(token: string) {
  return request<AdminMeResponse>('/admin/api/me', {token});
}

export function getAdminOverview(token: string) {
  return request<AdminOverviewResponse>('/admin/api/overview', {token});
}

export function getAdminDatabaseTables(token: string) {
  return request<AdminDatabaseTableListResponse>('/admin/api/database/tables', {
    token,
  });
}

export function getAdminDatabaseTableRows(
  token: string,
  tableName: string,
  query: AdminDatabaseTableRowsQuery = {},
) {
  return request<AdminDatabaseTableRowsResponse>(
    `/admin/api/database/tables/${encodeURIComponent(tableName)}/rows${buildDatabaseTableRowsQuery(query)}`,
    {token},
  );
}

export function debugAdminHttp(token: string, payload: AdminDebugHttpRequest) {
  return request<AdminDebugHttpResponse>('/admin/api/debug/http', {
    method: 'POST',
    token,
    body: payload,
  });
}

export function listAdminTrackingEvents(
  token: string,
  query: AdminTrackingEventListQuery = {},
) {
  return request<AdminTrackingEventListResponse>(
    `/admin/api/tracking/events${buildQueryString(query)}`,
    {token},
  );
}

export function listProfileRedeemCodes(token: string) {
  return request<ProfileRedeemCodeAdminListResponse>(
    '/admin/api/profile/redeem-codes',
    {token},
  );
}

export function upsertProfileRedeemCode(
  token: string,
  payload: AdminUpsertProfileRedeemCodeRequest,
) {
  return request<ProfileRedeemCodeAdminResponse>(
    '/admin/api/profile/redeem-codes',
    {
      method: 'POST',
      token,
      body: payload,
    },
  );
}

export function listProfileInviteCodes(token: string) {
  return request<ProfileInviteCodeAdminListResponse>(
    '/admin/api/profile/invite-codes',
    {token},
  );
}

export function upsertProfileInviteCode(
  token: string,
  payload: AdminUpsertProfileInviteCodeRequest,
) {
  return request<ProfileInviteCodeAdminResponse>(
    '/admin/api/profile/invite-codes',
    {
      method: 'POST',
      token,
      body: payload,
    },
  );
}

export function disableProfileRedeemCode(
  token: string,
  payload: AdminDisableProfileRedeemCodeRequest,
) {
  return request<ProfileRedeemCodeAdminResponse>(
    '/admin/api/profile/redeem-codes/disable',
    {
      method: 'POST',
      token,
      body: payload,
    },
  );
}

export function listProfileTaskConfigs(token: string) {
  return request<ProfileTaskConfigAdminListResponse>(
    '/admin/api/profile/tasks',
    {token},
  );
}

export function upsertProfileTaskConfig(
  token: string,
  payload: AdminUpsertProfileTaskConfigRequest,
) {
  return request<ProfileTaskConfigAdminResponse>('/admin/api/profile/tasks', {
    method: 'POST',
    token,
    body: payload,
  });
}

export function disableProfileTaskConfig(
  token: string,
  payload: AdminDisableProfileTaskConfigRequest,
) {
  return request<ProfileTaskConfigAdminResponse>(
    '/admin/api/profile/tasks/disable',
    {
      method: 'POST',
      token,
      body: payload,
    },
  );
}

function normalizeBaseUrl(value: string) {
  return value.trim().replace(/\/+$/, '');
}

function buildRequestUrl(path: string) {
  const normalizedPath = path.startsWith('/') ? path : `/${path}`;
  return `${ADMIN_API_BASE_URL}${normalizedPath}`;
}

function buildQueryString(query: AdminTrackingEventListQuery) {
  const params = new URLSearchParams();
  appendQueryParam(params, 'eventKey', query.eventKey);
  appendQueryParam(params, 'userId', query.userId);
  appendQueryParam(params, 'scopeKind', query.scopeKind);
  appendQueryParam(params, 'scopeId', query.scopeId);
  if (typeof query.limit === 'number' && Number.isFinite(query.limit)) {
    params.set('limit', String(query.limit));
  }
  const queryString = params.toString();
  return queryString ? `?${queryString}` : '';
}

function buildDatabaseTableRowsQuery(query: AdminDatabaseTableRowsQuery) {
  const params = new URLSearchParams();
  appendQueryParam(params, 'search', query.search);
  appendQueryParam(params, 'filters', query.filters);
  if (typeof query.limit === 'number' && Number.isFinite(query.limit)) {
    params.set('limit', String(query.limit));
  }
  const queryString = params.toString();
  return queryString ? `?${queryString}` : '';
}

function appendQueryParam(
  params: URLSearchParams,
  key: string,
  value: string | null | undefined,
) {
  const trimmed = value?.trim();
  if (trimmed) {
    params.set(key, trimmed);
  }
}

function parseJsonResponse(responseText: string): unknown {
  if (!responseText.trim()) {
    return null;
  }

  try {
    return JSON.parse(responseText) as unknown;
  } catch {
    return null;
  }
}

function unwrapSuccessPayload<T>(payload: unknown): T {
  if (isRecord(payload) && 'data' in payload) {
    return (payload as ApiSuccessEnvelope<T>).data as T;
  }

  return payload as T;
}

function buildAdminApiError(
  response: Response,
  payload: unknown,
  responseText: string,
) {
  const envelope = isRecord(payload) ? (payload as ApiErrorEnvelope) : null;
  const errorPayload = envelope?.error;
  const details = isRecord(errorPayload?.details)
    ? errorPayload.details
    : null;
  const detailsMessage =
    typeof details?.message === 'string' ? details.message.trim() : '';
  const payloadMessage =
    typeof errorPayload?.message === 'string' ? errorPayload.message.trim() : '';
  const topLevelMessage =
    typeof envelope?.message === 'string' ? envelope.message.trim() : '';
  const message =
    detailsMessage ||
    payloadMessage ||
    topLevelMessage ||
    response.statusText ||
    `HTTP ${response.status}`;

  return new AdminApiError({
    message,
    status: response.status,
    code: errorPayload?.code,
    details,
    meta: envelope?.meta ?? null,
    responseText,
  });
}

function isRecord(value: unknown): value is Record<string, unknown> {
  return typeof value === 'object' && value !== null && !Array.isArray(value);
}