import { inject, Injectable } from '@angular/core';
import { CoachAvailability, CoachDetailData, CoachPage, LearningReportDetail, LearningReportPage, LegacySyncRunResult, LegacySyncStatus, MediaUploadTicket, MemberImportPreview, MemberImportResult, MemberListSort, MemberPage, OperationsDashboardData, OperationsPage, OperationsUserDetail, PayRate, PayrollDetail, PayrollExportData, PayrollOverview, PayrollSummary, ScheduleCalendarData, ScheduleTrendData, ScheduleTrendPeriod, SpecialTrainingPage, StoreDetailData, StorePage, TeachingStandardsData, VocabularyImportPreview, VocabularyTree, VocabularyWord } from './admin.models';
import { CloudFunctionsService } from './cloud-functions.service';
import { AdminSessionService } from './admin-session.service';

export type OperationsListKind = 'relations' | 'course-bindings' | 'appointments' | 'lessons' | 'learning-records' | 'finance' | 'money-logs';

@Injectable({ providedIn: 'root' })
export class OperationsService {
  private readonly functions = inject(CloudFunctionsService);
  private readonly sessions = inject(AdminSessionService);
  readonly dataChanges$ = this.functions.dataChanges$;
  private dashboardCache: { token: string; data: OperationsDashboardData; savedAt: number } | null = null;
  private dashboardInFlight: { token: string; promise: Promise<OperationsDashboardData> } | null = null;
  private dashboardRevision = 0;

  constructor() {
    this.dataChanges$?.subscribe(() => { this.dashboardRevision++; this.dashboardCache = null; this.dashboardInFlight = null; });
  }

  dashboardSnapshot(): { data: OperationsDashboardData; ageMs: number } | null {
    const cached = this.dashboardCache;
    const token = this.sessions.session()?.sessionToken;
    const today = new Date().toLocaleDateString('sv-SE', { timeZone: 'Asia/Shanghai' });
    return cached && token && cached.token === token && cached.data.date === today
      ? { data: cached.data, ageMs: Date.now() - cached.savedAt }
      : null;
  }

  dashboard(): Promise<OperationsDashboardData> {
    const token = this.sessions.session()?.sessionToken || '';
    if (this.dashboardInFlight?.token === token) return this.dashboardInFlight.promise;
    const revision = this.dashboardRevision;
    const promise = this.functions.operations<OperationsDashboardData>('ops/dashboard/summary').then((data) => {
      if (token && this.sessions.session()?.sessionToken === token && revision === this.dashboardRevision) {
        this.dashboardCache = { token, data, savedAt: Date.now() };
      }
      return data;
    }).finally(() => { if (this.dashboardInFlight?.promise === promise) this.dashboardInFlight = null; });
    this.dashboardInFlight = { token, promise };
    return promise;
  }

  syncStatus(probe = true): Promise<LegacySyncStatus> {
    return this.functions.operations<LegacySyncStatus>('ops/sync/status', { probe });
  }

  runSync(dataset: string, full = false): Promise<LegacySyncRunResult> {
    return this.functions.operations<LegacySyncRunResult>('ops/sync/run', { dataset, full, pageSize: 500, maxPages: 5 });
  }

  retrySyncFailures(dataset = ''): Promise<LegacySyncRunResult> {
    return this.functions.operations<LegacySyncRunResult>('ops/sync/retry', { dataset });
  }

  scheduleTrend(period: ScheduleTrendPeriod): Promise<ScheduleTrendData> {
    return this.functions.operations<ScheduleTrendData>('ops/dashboard/schedule-trend', { period });
  }

  request<T>(operation: string, params: Record<string, unknown> = {}): Promise<T> {
    return this.functions.operations<T>(operation, params);
  }

  users(page: number, pageSize: number, search: string, filters: Record<string, unknown> = {}, sort: MemberListSort = { field: 'registeredAt', direction: 'desc' }, refresh = false): Promise<MemberPage> {
    return this.functions.operations<MemberPage>('ops/users/list', { page, pageSize, search, filters, sort, refresh });
  }

  userDetail(objectId: string): Promise<OperationsUserDetail> {
    return this.functions.operations<OperationsUserDetail>('ops/users/detail', { objectId });
  }

  memberRows(operation: 'ops/users/notes' | 'ops/users/audit', objectId: string): Promise<{ items: Record<string, unknown>[]; refreshedAt: string }> {
    return this.functions.operations<{ items: Record<string, unknown>[]; refreshedAt: string }>(operation, { objectId });
  }

  exportMembers(search: string, filters: Record<string, unknown>, sort: MemberListSort): Promise<{ fileName: string; items: Record<string, unknown>[] }> {
    return this.functions.operations<{ fileName: string; items: Record<string, unknown>[] }>('ops/users/export', { search, filters, sort });
  }

  previewMemberImport(fileName: string, rows: Record<string, unknown>[], reason: string, idempotencyKey: string): Promise<MemberImportPreview> {
    return this.functions.operations<MemberImportPreview>('ops/users/import-preview', { reason, idempotencyKey, payload: { fileName, rows } });
  }

  commitMemberImport(batchId: string, fileName: string, rows: Record<string, unknown>[], reason: string, idempotencyKey: string): Promise<MemberImportResult> {
    return this.functions.operations<MemberImportResult>('ops/users/import-commit', { targetId: batchId, reason, idempotencyKey, payload: { batchId, fileName, rows } });
  }

  coaches(page: number, pageSize: number, search = '', filters: Record<string, unknown> = {}, refresh = false): Promise<CoachPage> {
    return this.functions.operations<CoachPage>('ops/coaches/list', { page, pageSize, search, filters, refresh });
  }

  async stores(page: number, pageSize: number, search = '', filters: Record<string, unknown> = {}): Promise<StorePage> {
    const result = await this.functions.operations<StorePage>('ops/stores/list', { page, pageSize, search, filters });
    let countFailed = false;
    // Older gateways lack this field. Use the existing member query's total, not its page length.
    const items = await Promise.all(result.items.map(async (store) => {
      if (store.activeStudyingMemberCount != null) return store;
      try {
        if (!(store.userId > 0)) throw new Error('门店编号缺失');
        const members = await this.users(1, 1, '', { parentUserId: store.userId, learningStatus: 'studying', status: 'active' });
        if (!Number.isInteger(members.total) || members.total < 0) throw new Error('人数统计无效');
        return { ...store, activeStudyingMemberCount: members.total };
      } catch {
        countFailed = true;
        return store;
      }
    }));
    return { ...result, items, activeStudyingMemberCountError: countFailed ? '部分门店的在学正常学员人数加载失败，请点击刷新重试。' : '' };
  }

  storeDetail(objectId: string, month: string, refresh = false): Promise<StoreDetailData> {
    return this.functions.operations<StoreDetailData>('ops/stores/detail', { objectId, month, refresh });
  }

  coachDetail(objectId: string, month = '', refresh = false): Promise<CoachDetailData> {
    return this.functions.operations<CoachDetailData>('ops/coaches/detail', { objectId, month, refresh });
  }

  learningReports(page: number, pageSize: number, search = '', filters: Record<string, unknown> = {}, refresh = false): Promise<LearningReportPage> {
    return this.functions.operations<LearningReportPage>('ops/learning-reports/list', { page, pageSize, search, filters, sort: { field: 'studyDate', direction: 'desc' }, refresh });
  }

  learningReportDetail(targetId: string): Promise<LearningReportDetail> {
    return this.functions.operations<LearningReportDetail>('ops/learning-reports/detail', { targetId });
  }

  learningReportExport(targetId: string): Promise<LearningReportDetail> {
    return this.functions.operations<LearningReportDetail>('ops/learning-reports/export', { targetId });
  }

  schedule(dateFrom: string, dateTo: string, coachId = 0): Promise<ScheduleCalendarData> {
    return this.functions.operations<ScheduleCalendarData>('ops/schedule/calendar', { dateFrom, dateTo, filters: { coachId } });
  }

  availability(coachId: number): Promise<OperationsPage<CoachAvailability>> {
    return this.functions.operations<OperationsPage<CoachAvailability>>('ops/coach-availability/list', { page: 1, pageSize: 100, filters: { coachId } });
  }

  payRates(): Promise<OperationsPage<PayRate>> {
    return this.functions.operations<OperationsPage<PayRate>>('ops/pay-rates/list', { page: 1, pageSize: 100 });
  }

  teachingStandards(): Promise<TeachingStandardsData> {
    return this.functions.operations<TeachingStandardsData>('ops/teaching-rules/list');
  }

  reviewRewards(filters: import('./admin.models').ReviewRewardFilters, page = 1, status = '', pageSize = 20): Promise<import('./admin.models').ReviewRewardPage> {
    return this.functions.operations('ops/payroll/review-rewards', { ...filters, page, pageSize, status });
  }

  confirmLegacyReviewRewards(rewardIds: string[], reason: string): Promise<{ confirmed: number; alreadyConfirmed: number }> {
    return this.mutate('ops/payroll/review-rewards/confirm', '', reason, { rewardIds });
  }

  payrolls(page = 1, pageSize = 20, month = ''): Promise<OperationsPage<PayrollSummary>> {
    return this.functions.operations<OperationsPage<PayrollSummary>>('ops/payroll/list', { page, pageSize, month });
  }

  payrollPreview(month: string): Promise<PayrollDetail> {
    return this.functions.operations<PayrollDetail>('ops/payroll/preview', { month });
  }

  payrollOverview(month: string, storeId = 0, search = '', refresh = false): Promise<PayrollOverview> {
    return this.functions.operations<PayrollOverview>('ops/payroll/overview', { month, storeId, search, refresh });
  }

  payrollDetail(targetId: string): Promise<PayrollDetail> {
    return this.functions.operations<PayrollDetail>('ops/payroll/detail', { targetId });
  }

  payrollExport(month: string, targetId = '', storeId = 0, search = '', coachId = 0): Promise<PayrollExportData> {
    return this.functions.operations<PayrollExportData>('ops/payroll/export', { month, targetId, storeId, search, coachId });
  }

  vocabularyTree(): Promise<VocabularyTree> {
    return this.functions.operations<VocabularyTree>('ops/vocabulary/tree');
  }

  vocabulary(page: number, pageSize: number, search = '', filters: Record<string, unknown> = {}): Promise<OperationsPage<VocabularyWord>> {
    return this.functions.operations<OperationsPage<VocabularyWord>>('ops/vocabulary/list', { page, pageSize, search, filters });
  }

  specialTraining(page = 1, pageSize = 50, search = '', filters: Record<string, unknown> = {}, refresh = false): Promise<SpecialTrainingPage> {
    return this.functions.operations<SpecialTrainingPage>('ops/special-training/list', { page, pageSize, search, filters, refresh });
  }

  previewVocabularyImport(fileName: string, rows: Record<string, unknown>[], reason: string): Promise<VocabularyImportPreview> {
    return this.functions.operations<VocabularyImportPreview>('ops/vocabulary/import-preview', { reason, idempotencyKey: crypto.randomUUID(), payload: { fileName, rows } });
  }

  commitVocabularyImport(batchId: string, reason: string): Promise<Record<string, unknown>> {
    return this.functions.operations<Record<string, unknown>>('ops/vocabulary/import-commit', { targetId: batchId, reason, idempotencyKey: crypto.randomUUID() });
  }

  async uploadCover(file: File, reason: string, width: number, height: number): Promise<string> {
    const dataUrl = await new Promise<string>((resolve, reject) => {
      const reader = new FileReader();
      reader.onload = () => typeof reader.result === 'string' ? resolve(reader.result) : reject(new Error('无法读取封面文件'));
      reader.onerror = () => reject(new Error('无法读取封面文件'));
      reader.readAsDataURL(file);
    });
    const base64 = dataUrl.slice(dataUrl.indexOf(',') + 1);
    const result = await this.functions.operations<{ publicUrl: string }>('ops/media/upload-inline', {
      reason,
      idempotencyKey: crypto.randomUUID(),
      payload: { fileName: file.name, contentType: file.type, size: file.size, kind: 'image', base64, width, height },
    });
    return result.publicUrl;
  }

  async uploadMedia(file: File, kind: 'image' | 'audio' | 'video', reason: string): Promise<string> {
    const ticket = await this.functions.operations<MediaUploadTicket>('ops/media/presign', { reason, idempotencyKey: crypto.randomUUID(), payload: { fileName: file.name, contentType: file.type, size: file.size, kind } });
    const response = await fetch(ticket.uploadUrl, { method: ticket.method, headers: ticket.headers, body: file });
    if (!response.ok) throw new Error(`媒体上传失败（${response.status}）`);
    const completed = await this.functions.operations<{ publicUrl: string }>('ops/media/complete', { targetId: ticket.ticketId, reason, idempotencyKey: crypto.randomUUID() });
    return completed.publicUrl;
  }

  list(kind: OperationsListKind, page: number, pageSize: number, search: string, filters: Record<string, unknown> = {}): Promise<OperationsPage> {
    const operation = kind === 'relations' ? 'ops/relations/list'
      : kind === 'course-bindings' ? 'ops/course-bindings/list'
      : kind === 'appointments' ? 'ops/appointments/list'
      : kind === 'lessons' ? 'ops/lessons/list'
      : kind === 'learning-records' ? 'ops/learning-records/list'
      : kind === 'finance' ? 'ops/finance/list'
      : 'ops/money-logs/list';
    return this.functions.operations<OperationsPage>(operation, { page, pageSize, search, filters });
  }

  mutate<T>(operation: string, targetId: string, reason: string, payload: Record<string, unknown> = {}, expectedUpdatedAt = '', idempotencyKey = ''): Promise<T> {
    return this.functions.operations<T>(operation, { targetId, reason, payload, expectedUpdatedAt, idempotencyKey: idempotencyKey || crypto.randomUUID() });
  }
}