/**
 * Notification API Service
 * Fetches notifications from /api/v1/notifications/ endpoints
 */

import { fetchAPI } from './api';

// ============================================================================
// TYPES
// ============================================================================

// Notification types - match backend NotificationType choices
export type NotificationTypeAPI = 
  // AI Operations
  | 'ai_cluster_complete'
  | 'ai_cluster_failed'
  | 'ai_ideas_complete'
  | 'ai_ideas_failed'
  | 'ai_content_complete'
  | 'ai_content_failed'
  | 'ai_images_complete'
  | 'ai_images_failed'
  | 'ai_prompts_complete'
  | 'ai_prompts_failed'
  // Workflow
  | 'content_ready_review'
  | 'content_published'
  | 'content_publish_failed'
  // WordPress Sync
  | 'wordpress_sync_success'
  | 'wordpress_sync_failed'
  // Credits/Billing
  | 'credits_low'
  | 'credits_depleted'
  // Setup
  | 'site_setup_complete'
  | 'keywords_imported'
  // System
  | 'system_info'
  // Legacy/fallback
  | 'ai_task'
  | 'system'
  | 'credit'
  | 'billing'
  | 'integration'
  | 'content'
  | 'info';

export type NotificationSeverityAPI = 'info' | 'success' | 'warning' | 'error';

export interface NotificationAPI {
  id: number;
  notification_type: NotificationTypeAPI;
  severity: NotificationSeverityAPI;
  title: string;
  message: string;
  is_read: boolean;
  created_at: string;
  read_at: string | null;
  action_label: string | null;
  action_url: string | null;
  metadata: Record<string, unknown> | null;
  related_object_type: string | null;
  related_object_id: number | null;
}

export interface NotificationListResponse {
  count: number;
  next: string | null;
  previous: string | null;
  results: NotificationAPI[];
}

export interface UnreadCountResponse {
  unread_count: number;
}

// ============================================================================
// API FUNCTIONS
// ============================================================================

/**
 * Fetch notifications list
 */
export async function fetchNotifications(params?: {
  page?: number;
  page_size?: number;
  is_read?: boolean;
  notification_type?: NotificationTypeAPI;
}): Promise<NotificationListResponse> {
  const searchParams = new URLSearchParams();
  if (params?.page) searchParams.set('page', params.page.toString());
  if (params?.page_size) searchParams.set('page_size', params.page_size.toString());
  if (params?.is_read !== undefined) searchParams.set('is_read', params.is_read.toString());
  if (params?.notification_type) searchParams.set('notification_type', params.notification_type);
  
  const queryString = searchParams.toString();
  const url = `/v1/notifications/${queryString ? `?${queryString}` : ''}`;
  
  return fetchAPI(url);
}

/**
 * Get unread notification count
 */
export async function fetchUnreadCount(): Promise<UnreadCountResponse> {
  return fetchAPI('/v1/notifications/unread-count/');
}

/**
 * Mark a single notification as read
 */
export async function markNotificationRead(id: number): Promise<NotificationAPI> {
  return fetchAPI(`/v1/notifications/${id}/read/`, {
    method: 'POST',
  });
}

/**
 * Mark all notifications as read
 */
export async function markAllNotificationsRead(): Promise<{ message: string; count: number }> {
  return fetchAPI('/v1/notifications/read-all/', {
    method: 'POST',
  });
}

/**
 * Delete a notification
 */
export async function deleteNotification(id: number): Promise<void> {
  await fetchAPI(`/v1/notifications/${id}/`, {
    method: 'DELETE',
  });
}

/**
 * Delete multiple notifications
 */
export async function deleteNotifications(ids: number[]): Promise<void> {
  await Promise.all(ids.map(id => deleteNotification(id)));
}