import type {
  CleaningSettlement,
  CleaningTask,
  PageResult,
  SettlementStatus,
  TaskStatus,
  TransferMode,
  WechatTransferPreflight
} from './types';

const API_BASE = (import.meta.env.VITE_ADMIN_API_BASE_URL || '/admin-api').replace(/\/$/, '');

export class ApiError extends Error {
  constructor(
    public readonly code: string,
    message = code,
    public readonly traceId = ''
  ) {
    super(message);
  }
}

export interface ApiSession {
  token: string;
}

async function request<T>(
  session: ApiSession,
  path: string,
  options: RequestInit = {}
): Promise<T> {
  if (!session.token.trim()) {
    throw new ApiError('AUTH_TOKEN_REQUIRED', '需要先填入后台访问令牌');
  }
  const headers = new Headers(options.headers);
  headers.set('authorization', `Bearer ${session.token.trim()}`);
  if (options.body && !headers.has('content-type')) {
    headers.set('content-type', 'application/json');
  }
  const response = await fetch(`${API_BASE}${path}`, { ...options, headers });
  const payload = await response.json().catch(() => ({}));
  if (!response.ok || payload.code !== 0) {
    throw new ApiError(
      String(payload.code || `HTTP_${response.status}`),
      String(payload.message || '请求失败'),
      String(payload.traceId || '')
    );
  }
  return payload.data as T;
}

export function listCleaningTasks(
  session: ApiSession,
  input: { page: number; pageSize: number; status?: TaskStatus }
) {
  const params = new URLSearchParams({
    page: String(input.page),
    pageSize: String(input.pageSize)
  });
  if (input.status) params.set('status', input.status);
  return request<PageResult<CleaningTask>>(session, `/cleaning/tasks?${params}`);
}

export function assignCleaningTask(
  session: ApiSession,
  taskId: string,
  input: { cleanerUserId: string; note?: string }
) {
  return request<CleaningTask>(session, `/cleaning/tasks/${encodeURIComponent(taskId)}/assign`, {
    method: 'POST',
    body: JSON.stringify(input)
  });
}

export function completeCleaningTask(session: ApiSession, taskId: string, note?: string) {
  return request<CleaningTask>(session, `/cleaning/tasks/${encodeURIComponent(taskId)}/complete`, {
    method: 'POST',
    body: JSON.stringify({ note })
  });
}

export function rejectCleaningTask(session: ApiSession, taskId: string, reason: string) {
  return request<CleaningTask>(session, `/cleaning/tasks/${encodeURIComponent(taskId)}/reject`, {
    method: 'POST',
    body: JSON.stringify({ reason })
  });
}

export function reclaimCleaningTimeouts(
  session: ApiSession,
  input: { olderThanMinutes: number; limit: number }
) {
  return request<{ reclaimed: number; taskIds: string[] }>(session, '/cleaning/reclaim-timeouts', {
    method: 'POST',
    body: JSON.stringify(input)
  });
}

export function listCleaningSettlements(
  session: ApiSession,
  input: { page: number; pageSize: number; status?: SettlementStatus }
) {
  const params = new URLSearchParams({
    page: String(input.page),
    pageSize: String(input.pageSize)
  });
  if (input.status) params.set('status', input.status);
  return request<PageResult<CleaningSettlement>>(session, `/cleaning/settlements?${params}`);
}

export function generateCleaningSettlement(
  session: ApiSession,
  input: { cleanerUserId: string; storeId?: string; note?: string }
) {
  return request<CleaningSettlement>(session, '/cleaning/settlements', {
    method: 'POST',
    body: JSON.stringify(input)
  });
}

export function confirmCleaningSettlement(session: ApiSession, settlementId: string, note?: string) {
  return request<CleaningSettlement>(
    session,
    `/cleaning/settlements/${encodeURIComponent(settlementId)}/confirm`,
    {
      method: 'POST',
      body: JSON.stringify({ note })
    }
  );
}

export function executeWechatTransfer(
  session: ApiSession,
  settlementId: string,
  input: { mode: TransferMode; note?: string }
) {
  return request<{ settlement: CleaningSettlement; transferState: string; idempotent: boolean }>(
    session,
    `/cleaning/settlements/${encodeURIComponent(settlementId)}/wechat-transfer`,
    {
      method: 'POST',
      body: JSON.stringify(input)
    }
  );
}

export function preflightWechatTransfer(session: ApiSession, settlementId: string) {
  return request<WechatTransferPreflight>(
    session,
    `/cleaning/settlements/${encodeURIComponent(settlementId)}/wechat-transfer/preflight`
  );
}

export function syncWechatTransfer(session: ApiSession, settlementId: string, note?: string) {
  return request<{ settlement: CleaningSettlement; transferState: string; idempotent: boolean }>(
    session,
    `/cleaning/settlements/${encodeURIComponent(settlementId)}/wechat-transfer/sync`,
    {
      method: 'POST',
      body: JSON.stringify({ note })
    }
  );
}

export function recordPayoutFailure(
  session: ApiSession,
  settlementId: string,
  input: { error: string; payoutChannel?: string; payoutReference?: string; note?: string }
) {
  return request<CleaningSettlement>(
    session,
    `/cleaning/settlements/${encodeURIComponent(settlementId)}/payout-failure`,
    {
      method: 'POST',
      body: JSON.stringify(input)
    }
  );
}