/**
 * Admin API Service
 * Handles all admin-related API operations
 */

import { apiDelete, apiGet, apiPost } from '@/lib/api-client';
import { httpClient } from '@/lib/http-client';
import { z } from 'zod';

// ============================================================================
// Dashboard & Statistics
// ============================================================================

export const dashboardStatsSchema = z.object({
  totalOrganizations: z.number(),
  verifiedOrganizations: z.number(),
  activeConnections: z.number(),
  newThisMonth: z.number(),
  pendingVerifications: z.number(),
  pendingTranslations: z.number(),
  systemAlerts: z.number(),
});

export type DashboardStats = z.infer<typeof dashboardStatsSchema>;

export const organizationStatsSchema = z.object({
  total: z.number(),
  verified: z.number(),
  pending: z.number(),
  unverified: z.number(),
  newThisMonth: z.number(),
  bySector: z.record(z.string(), z.number()),
  bySubtype: z.record(z.string(), z.number()),
  verificationRate: z.number(),
});

export type OrganizationStats = z.infer<typeof organizationStatsSchema>;

export const userActivityStatsSchema = z.object({
  totalUsers: z.number(),
  activeUsers: z.number(),
  inactiveUsers: z.number(),
  newThisMonth: z.number(),
  byRole: z.record(z.string(), z.number()),
  lastLoginStats: z.record(z.string(), z.number()),
});

export type UserActivityStats = z.infer<typeof userActivityStatsSchema>;

export const matchingStatsSchema = z.object({
  totalMatches: z.number(),
  activeMatches: z.number(),
  successfulMatches: z.number(),
  matchRate: z.number(),
});

export type MatchingStats = z.infer<typeof matchingStatsSchema>;

export const systemHealthSchema = z.object({
  status: z.enum(['healthy', 'degraded', 'down']),
  database: z.string(),
  cache: z.string(),
  externalServices: z.record(z.string(), z.string()),
  uptime: z.number(),
  responseTime: z.number(),
  errorRate: z.number(),
  activeConnections: z.number(),
});

export type SystemHealth = z.infer<typeof systemHealthSchema>;

const activityItemSchema = z.object({
  id: z.string(),
  type: z.string(),
  description: z.string(),
  timestamp: z.string(),
});

export const recentActivitySchema = z.array(activityItemSchema);
export type RecentActivity = z.infer<typeof recentActivitySchema>;

/**
 * Get dashboard statistics
 */
export async function getDashboardStats(): Promise<DashboardStats> {
  return apiGet<DashboardStats>('/admin/dashboard/stats');
}

/**
 * Get organization statistics
 */
export async function getOrganizationStats(): Promise<OrganizationStats> {
  return apiGet<OrganizationStats>('/admin/analytics/organizations');
}

/**
 * Get user activity statistics
 */
export async function getUserActivityStats(): Promise<UserActivityStats> {
  return apiGet<UserActivityStats>('/admin/analytics/users');
}

/**
 * Get matching statistics
 */
export async function getMatchingStats(): Promise<MatchingStats> {
  return apiGet<MatchingStats>('/admin/analytics/matching');
}

/**
 * Get system health
 */
export async function getSystemHealth(): Promise<SystemHealth> {
  return apiGet<SystemHealth>('/admin/system/health');
}

export type MaintenanceSetting = { enabled: boolean; message: string; allowedIPs?: string[] };

/**
 * Get maintenance settings
 */
export async function getMaintenance(): Promise<MaintenanceSetting> {
  const resp: any = await apiGet('/admin/settings/maintenance');
  // Normalize server-side snake_case to camelCase
  return {
    enabled: resp.enabled,
    message: resp.message,
    allowedIPs: resp.allowed_ips || resp.allowedIPs || [],
  };
}

/**
 * Set maintenance settings
 */
export async function setMaintenance(request: MaintenanceSetting): Promise<{ message: string }> {
  const payload: any = {
    enabled: request.enabled,
    message: request.message,
    allowed_ips: request.allowedIPs || [],
  };
  return httpClient.put('/admin/settings/maintenance', payload);
}

/**
 * Get recent activity feed for admin dashboard
 */
export async function getRecentActivity(): Promise<RecentActivity> {
  return apiGet<RecentActivity>('/admin/dashboard/activity');
}

// ============================================================================
// User Management
// ============================================================================

export const userSchema = z.object({
  id: z.string(),
  email: z.string(),
  name: z.string(),
  role: z.string(),
  permissions: z.string().optional(),
  lastLoginAt: z.string().nullable().optional(),
  isActive: z.boolean(),
  createdAt: z.string(),
  updatedAt: z.string(),
});

export type User = z.infer<typeof userSchema>;

export const userListResponseSchema = z.object({
  users: z.array(userSchema),
  total: z.number(),
  limit: z.number(),
  offset: z.number(),
});

export type UserListResponse = z.infer<typeof userListResponseSchema>;

export const createUserRequestSchema = z.object({
  email: z.string().email(),
  name: z.string().min(1),
  password: z.string().min(8),
  role: z.string(),
  permissions: z.array(z.string()).optional(),
});

export type CreateUserRequest = z.infer<typeof createUserRequestSchema>;

export const updateUserRequestSchema = z.object({
  name: z.string().optional(),
  email: z.string().email().optional(),
  role: z.string().optional(),
  permissions: z.array(z.string()).optional(),
  isActive: z.boolean().optional(),
});

export type UpdateUserRequest = z.infer<typeof updateUserRequestSchema>;

export const userStatsSchema = z.object({
  total: z.number(),
  active: z.number(),
  inactive: z.number(),
  new_this_month: z.number(),
  by_role: z.record(z.string(), z.number()),
});

export type UserStats = z.infer<typeof userStatsSchema>;

/**
 * List users with filters
 */
export async function listUsers(params?: {
  role?: string;
  isActive?: boolean;
  search?: string;
  limit?: number;
  offset?: number;
}): Promise<UserListResponse> {
  const queryParams = new URLSearchParams();
  if (params?.role) queryParams.append('role', params.role);
  if (params?.isActive !== undefined) queryParams.append('isActive', String(params.isActive));
  if (params?.search) queryParams.append('search', params.search);
  if (params?.limit) queryParams.append('limit', String(params.limit));
  if (params?.offset) queryParams.append('offset', String(params.offset));

  const query = queryParams.toString();
  return apiGet<UserListResponse>(`/admin/users${query ? `?${query}` : ''}`);
}

/**
 * Get user by ID
 */
export async function getUser(id: string): Promise<User> {
  return apiGet<User>(`/admin/users/${id}`);
}

/**
 * Create user
 */
export async function createUser(request: CreateUserRequest): Promise<User> {
  return apiPost<User>('/admin/users', request);
}

/**
 * Update user
 */
export async function updateUser(id: string, request: UpdateUserRequest): Promise<User> {
  return httpClient.put<User>(`/admin/users/${id}`, request);
}

/**
 * Update user role
 */
export async function updateUserRole(id: string, role: string): Promise<{ message: string }> {
  return apiPost<{ message: string }>(`/admin/users/${id}/role`, { role });
}

/**
 * Update user permissions
 */
export async function updateUserPermissions(
  id: string,
  permissions: string[]
): Promise<{ message: string }> {
  return apiPost<{ message: string }>(`/admin/users/${id}/permissions`, { permissions });
}

/**
 * Deactivate user
 */
export async function deactivateUser(id: string): Promise<{ message: string }> {
  return apiDelete<{ message: string }>(`/admin/users/${id}`);
}

/**
 * Get user activity log
 */
export async function getUserActivity(
  id: string,
  params?: { limit?: number; offset?: number }
): Promise<{
  activities: unknown[];
  total: number;
  limit: number;
  offset: number;
}> {
  const queryParams = new URLSearchParams();
  if (params?.limit) queryParams.append('limit', String(params.limit));
  if (params?.offset) queryParams.append('offset', String(params.offset));

  const query = queryParams.toString();
  return apiGet(`/admin/users/${id}/activity${query ? `?${query}` : ''}`);
}

/**
 * Get user statistics
 */
export async function getUserStats(): Promise<UserStats> {
  return apiGet<UserStats>('/admin/users/stats');
}

// ============================================================================
// Organization Verification
// ============================================================================

export const verificationQueueItemSchema = z.object({
  id: z.string(),
  organizationId: z.string(),
  dataType: z.string(),
  dataId: z.string(),
  status: z.enum(['unverified', 'pending', 'verified', 'rejected']),
  verifiedBy: z.string().optional(),
  verifiedAt: z.string().nullable().optional(),
  notes: z.string().optional(),
});

export type VerificationQueueItem = z.infer<typeof verificationQueueItemSchema>;

export const verificationQueueResponseSchema = z.object({
  queue: z.array(verificationQueueItemSchema),
});

export type VerificationQueueResponse = z.infer<typeof verificationQueueResponseSchema>;

export const verificationStatsSchema = z.object({
  total: z.number(),
  pending: z.number(),
  verified: z.number(),
  rejected: z.number(),
  unverified: z.number(),
  average_time_days: z.number().optional(),
});

export type VerificationStats = z.infer<typeof verificationStatsSchema>;

/**
 * Get verification queue
 */
export async function getVerificationQueue(params?: {
  status?: string;
  dataType?: string;
  organizationId?: string;
}): Promise<VerificationQueueResponse> {
  const queryParams = new URLSearchParams();
  if (params?.status) queryParams.append('status', params.status);
  if (params?.dataType) queryParams.append('dataType', params.dataType);
  if (params?.organizationId) queryParams.append('organizationId', params.organizationId);

  const query = queryParams.toString();
  return apiGet<VerificationQueueResponse>(
    `/admin/organizations/verification-queue${query ? `?${query}` : ''}`
  );
}

/**
 * Verify organization
 */
export async function verifyOrganization(id: string, notes?: string): Promise<{ message: string }> {
  return apiPost<{ message: string }>(`/admin/organizations/${id}/verify`, { notes: notes || '' });
}

/**
 * Reject verification
 */
export async function rejectVerification(
  id: string,
  reason: string,
  notes?: string
): Promise<{ message: string }> {
  return apiPost<{ message: string }>(`/admin/organizations/${id}/reject`, {
    reason,
    notes: notes || '',
  });
}

/**
 * Bulk verify organizations
 */
export async function bulkVerifyOrganizations(
  organizationIds: string[]
): Promise<{ message: string }> {
  return apiPost<{ message: string }>('/admin/organizations/bulk-verify', { organizationIds });
}

/**
 * Get organization statistics
 */
export async function getOrganizationStatsAdmin(): Promise<OrganizationStats> {
  return apiGet<OrganizationStats>('/admin/organizations/stats');
}

// ============================================================================
// Localization Management
// ============================================================================

export const translationKeySchema = z.object({
  key: z.string(),
  source: z.string(),
  value: z.string(),
  status: z.enum(['missing', 'translated']),
});

export type TranslationKey = z.infer<typeof translationKeySchema>;

export const translationKeysResponseSchema = z.object({
  locale: z.string(),
  keys: z.array(translationKeySchema),
  total: z.number(),
  translated: z.number(),
  missing: z.number(),
});

export type TranslationKeysResponse = z.infer<typeof translationKeysResponseSchema>;

export const updateUITranslationRequestSchema = z.object({
  value: z.string(),
});

export const bulkUpdateUITranslationsRequestSchema = z.object({
  updates: z.array(
    z.object({
      locale: z.string(),
      key: z.string(),
      value: z.string(),
    })
  ),
});

export const autoTranslateRequestSchema = z.object({
  sourceLocale: z.string(),
  targetLocale: z.string(),
});

export const autoTranslateResponseSchema = z.object({
  message: z.string(),
  translated: z.number(),
  results: z.record(z.string(), z.string()).optional(),
});

/**
 * Update UI translation
 */
export async function updateUITranslation(
  locale: string,
  key: string,
  value: string
): Promise<{ message: string }> {
  return apiPost<{ message: string }>(`/admin/i18n/ui/${locale}/${key}`, { value });
}

/**
 * Bulk update UI translations
 */
export async function bulkUpdateUITranslations(
  updates: Array<{ locale: string; key: string; value: string }>
): Promise<{ message: string }> {
  return apiPost<{ message: string }>('/admin/i18n/ui/bulk-update', { updates });
}

/**
 * Auto-translate missing keys
 */
export async function autoTranslateMissing(
  sourceLocale: string,
  targetLocale: string
): Promise<{
  message: string;
  translated: number;
  results?: Record<string, string>;
}> {
  return apiPost('/admin/i18n/ui/auto-translate', { sourceLocale, targetLocale });
}

/**
 * Get translation keys for a locale
 */
export async function getTranslationKeys(locale: string): Promise<TranslationKeysResponse> {
  return apiGet<TranslationKeysResponse>(`/admin/i18n/ui/${locale}/keys`);
}

/**
 * Update data translation
 */
export async function updateDataTranslation(
  entityType: string,
  entityID: string,
  field: string,
  locale: string,
  value: string
): Promise<{ message: string }> {
  return apiPost<{ message: string }>(
    `/admin/i18n/data/${entityType}/${entityID}/${field}/${locale}`,
    { value }
  );
}

/**
 * Bulk translate data
 */
export async function bulkTranslateData(
  entityType: string,
  entityIDs: string[],
  targetLocale: string,
  fields?: string[]
): Promise<{
  message: string;
  translated: number;
  results: Record<string, Record<string, string>>;
}> {
  return apiPost<{
    message: string;
    translated: number;
    results: Record<string, Record<string, string>>;
  }>('/admin/i18n/data/bulk-translate', {
    entityType,
    entityIDs,
    targetLocale,
    fields,
  });
}

/**
 * Get missing translations
 */
export async function getMissingTranslations(entityType: string, locale: string): Promise<any> {
  return apiGet(`/admin/i18n/data/${entityType}/missing?locale=${locale}`);
}

// ============================================================================
// Content Management
// ============================================================================

export const staticPageSchema = z.object({
  id: z.string(),
  slug: z.string(),
  title: z.string(),
  content: z.string().optional(),
  metaDescription: z.string().optional(),
  seoKeywords: z.array(z.string()).optional(),
  status: z.enum(['draft', 'published', 'archived']),
  visibility: z.enum(['public', 'private', 'admin']),
  template: z.string().optional(),
  publishedAt: z.string().nullable().optional(),
  createdBy: z.string().optional(),
  updatedBy: z.string().optional(),
  createdAt: z.string(),
  updatedAt: z.string(),
});

export type StaticPage = z.infer<typeof staticPageSchema>;

export const staticPagesResponseSchema = z.object({
  pages: z.array(staticPageSchema),
});

export type StaticPagesResponse = z.infer<typeof staticPagesResponseSchema>;

export const createPageRequestSchema = z.object({
  slug: z.string(),
  title: z.string(),
  content: z.string().optional(),
  metaDescription: z.string().optional(),
  seoKeywords: z.array(z.string()).optional(),
  status: z.string().optional(),
  visibility: z.string().optional(),
  template: z.string().optional(),
});

export type CreatePageRequest = z.infer<typeof createPageRequestSchema>;

export const updatePageRequestSchema = z.object({
  title: z.string().optional(),
  content: z.string().optional(),
  metaDescription: z.string().optional(),
  status: z.string().optional(),
  visibility: z.string().optional(),
});

export type UpdatePageRequest = z.infer<typeof updatePageRequestSchema>;

export const announcementSchema = z.object({
  id: z.string(),
  title: z.string(),
  content: z.string(),
  priority: z.enum(['low', 'normal', 'high', 'urgent']),
  displayType: z.enum(['banner', 'modal', 'notification']),
  targetAudience: z.enum(['all', 'organizations', 'users', 'specific']),
  targetGroups: z.array(z.string()).optional(),
  startDate: z.string().nullable().optional(),
  endDate: z.string().nullable().optional(),
  isActive: z.boolean(),
  views: z.number(),
  clicks: z.number(),
  dismissals: z.number(),
  createdBy: z.string().optional(),
  updatedBy: z.string().optional(),
  createdAt: z.string(),
  updatedAt: z.string(),
});

export type Announcement = z.infer<typeof announcementSchema>;

export const announcementsResponseSchema = z.object({
  announcements: z.array(announcementSchema),
});

export type AnnouncementsResponse = z.infer<typeof announcementsResponseSchema>;

export const createAnnouncementRequestSchema = z.object({
  title: z.string(),
  content: z.string(),
  priority: z.string().optional(),
  displayType: z.string().optional(),
  targetAudience: z.string().optional(),
  startDate: z.string().optional(),
  endDate: z.string().optional(),
  isActive: z.boolean().optional(),
});

export type CreateAnnouncementRequest = z.infer<typeof createAnnouncementRequestSchema>;

export const mediaAssetSchema = z.object({
  id: z.string(),
  filename: z.string(),
  originalName: z.string(),
  url: z.string(),
  type: z.enum(['image', 'video', 'document', 'audio']),
  mimeType: z.string().optional(),
  size: z.number().optional(),
  width: z.number().nullable().optional(),
  height: z.number().nullable().optional(),
  duration: z.number().nullable().optional(),
  altText: z.string().optional(),
  tags: z.array(z.string()).optional(),
  uploadedBy: z.string().optional(),
  createdAt: z.string(),
  updatedAt: z.string(),
});

export type MediaAsset = z.infer<typeof mediaAssetSchema>;

export const mediaAssetsResponseSchema = z.object({
  assets: z.array(mediaAssetSchema),
});

export type MediaAssetsResponse = z.infer<typeof mediaAssetsResponseSchema>;

/**
 * List static pages
 */
export async function listPages(): Promise<StaticPagesResponse> {
  return apiGet<StaticPagesResponse>('/admin/content/pages');
}

/**
 * Get page by ID
 */
export async function getPage(id: string): Promise<StaticPage> {
  return apiGet<StaticPage>(`/admin/content/pages/${id}`);
}

/**
 * Create page
 */
export async function createPage(request: CreatePageRequest): Promise<StaticPage> {
  return apiPost<StaticPage>('/admin/content/pages', request);
}

/**
 * Update page
 */
export async function updatePage(id: string, request: UpdatePageRequest): Promise<StaticPage> {
  return httpClient.put<StaticPage>(`/admin/content/pages/${id}`, request);
}

/**
 * Delete page
 */
export async function deletePage(id: string): Promise<{ message: string }> {
  return apiDelete<{ message: string }>(`/admin/content/pages/${id}`);
}

/**
 * Publish page
 */
export async function publishPage(id: string): Promise<StaticPage> {
  return apiPost<StaticPage>(`/admin/content/pages/${id}/publish`, {});
}

/**
 * List announcements
 */
export async function listAnnouncements(params?: {
  isActive?: boolean;
  priority?: string;
}): Promise<AnnouncementsResponse> {
  const queryParams = new URLSearchParams();
  if (params?.isActive !== undefined) queryParams.append('isActive', String(params.isActive));
  if (params?.priority) queryParams.append('priority', params.priority);

  const query = queryParams.toString();
  return apiGet<AnnouncementsResponse>(`/admin/content/announcements${query ? `?${query}` : ''}`);
}

/**
 * Get announcement by ID
 */
export async function getAnnouncement(id: string): Promise<Announcement> {
  return apiGet<Announcement>(`/admin/content/announcements/${id}`);
}

/**
 * Create announcement
 */
export async function createAnnouncement(
  request: CreateAnnouncementRequest
): Promise<Announcement> {
  return apiPost<Announcement>('/admin/content/announcements', request);
}

/**
 * Update announcement
 */
export async function updateAnnouncement(
  id: string,
  request: Partial<CreateAnnouncementRequest>
): Promise<Announcement> {
  return httpClient.put<Announcement>(`/admin/content/announcements/${id}`, request);
}

/**
 * Delete announcement
 */
export async function deleteAnnouncement(id: string): Promise<{ message: string }> {
  return apiDelete<{ message: string }>(`/admin/content/announcements/${id}`);
}

/**
 * List media assets
 */
export async function listMediaAssets(params?: {
  type?: string;
  tags?: string;
}): Promise<MediaAssetsResponse> {
  const queryParams = new URLSearchParams();
  if (params?.type) queryParams.append('type', params.type);
  if (params?.tags) queryParams.append('tags', params.tags);

  const query = queryParams.toString();
  return apiGet<MediaAssetsResponse>(`/admin/content/media${query ? `?${query}` : ''}`);
}

/**
 * Get media asset by ID
 */
export async function getMediaAsset(id: string): Promise<MediaAsset> {
  return apiGet<MediaAsset>(`/admin/content/media/${id}`);
}

/**
 * Create media asset
 */
export async function createMediaAsset(request: {
  filename: string;
  originalName: string;
  url: string;
  type: string;
  mimeType?: string;
  size?: number;
  width?: number;
  height?: number;
  duration?: number;
  altText?: string;
  tags?: string[];
}): Promise<MediaAsset> {
  return apiPost<MediaAsset>('/admin/content/media', request);
}

/**
 * Update media asset
 */
export async function updateMediaAsset(
  id: string,
  request: { altText?: string; tags?: string[] }
): Promise<MediaAsset> {
  return httpClient.put<MediaAsset>(`/admin/content/media/${id}`, request);
}

/**
 * Delete media asset
 */
export async function deleteMediaAsset(id: string): Promise<{ message: string }> {
  return apiDelete<{ message: string }>(`/admin/content/media/${id}`);
}