import { Notification, NotificationCount } from '@/lib/types/notification';
import { NotificationAdapter } from './notification-adapter.interface';
import { getServerSession } from 'next-auth';
import { authOptions } from "@/app/api/auth/options";

// Leantime notification type from their API
interface LeantimeNotification {
  id: number;
  userId: number;
  username: string;
  message: string;
  type: string;
  moduleId: number;
  url: string;
  read: number; // 0 for unread, 1 for read
  date: string; // ISO format date
}

export class LeantimeAdapter implements NotificationAdapter {
  readonly sourceName = 'leantime';
  private apiUrl: string;
  private apiToken: string;

  constructor() {
    this.apiUrl = process.env.LEANTIME_API_URL || '';
    this.apiToken = process.env.LEANTIME_TOKEN || '';
    
    console.log('[LEANTIME_ADAPTER] Initialized with API URL and token');
  }

  async getNotifications(userId: string, page = 1, limit = 20): Promise<Notification[]> {
    console.log(`[LEANTIME_ADAPTER] getNotifications called for userId: ${userId}, page: ${page}, limit: ${limit}`);
    
    try {
      // Get the user's email directly from the session
      const email = await this.getUserEmail();
      console.log(`[LEANTIME_ADAPTER] Retrieved email from session:`, email || 'null');
      
      if (!email) {
        console.error('[LEANTIME_ADAPTER] Could not get user email from session');
        return [];
      }
      
      const leantimeUserId = await this.getLeantimeUserId(email);
      console.log(`[LEANTIME_ADAPTER] Retrieved Leantime userId for email ${email}:`, leantimeUserId || 'null');
      
      if (!leantimeUserId) {
        console.error('[LEANTIME_ADAPTER] User not found in Leantime:', email);
        return [];
      }
      
      // Calculate pagination limits
      const limitStart = (page - 1) * limit;
      const limitEnd = limit;
      
      // Make request to Leantime API using the correct jsonrpc method
      console.log('[LEANTIME_ADAPTER] Sending request to get all notifications');
      const jsonRpcBody = {
        jsonrpc: '2.0',
        method: 'leantime.rpc.Notifications.Notifications.getAllNotifications',
        params: {
          userId: leantimeUserId,
          showNewOnly: 0, // Get all notifications, not just unread
          limitStart: limitStart,
          limitEnd: limitEnd,
          filterOptions: [] // No additional filters
        },
        id: 1
      };
      console.log('[LEANTIME_ADAPTER] Request body:', JSON.stringify(jsonRpcBody));
      
      const response = await fetch(`${this.apiUrl}/api/jsonrpc`, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'X-API-Key': this.apiToken
        },
        body: JSON.stringify(jsonRpcBody)
      });

      console.log('[LEANTIME_ADAPTER] Response status:', response.status);
      
      if (!response.ok) {
        const errorText = await response.text();
        console.error('[LEANTIME_ADAPTER] Failed to fetch Leantime notifications:', {
          status: response.status,
          body: errorText.substring(0, 200) + (errorText.length > 200 ? '...' : '')
        });
        return [];
      }

      const responseText = await response.text();
      console.log('[LEANTIME_ADAPTER] Raw response (truncated):', responseText.substring(0, 200) + (responseText.length > 200 ? '...' : ''));
      
      const data = JSON.parse(responseText);
      console.log('[LEANTIME_ADAPTER] Parsed response data:', {
        hasResult: !!data.result,
        resultIsArray: Array.isArray(data.result),
        resultLength: Array.isArray(data.result) ? data.result.length : 'n/a',
        error: data.error
      });
      
      if (!data.result || !Array.isArray(data.result)) {
        if (data.error) {
          console.error(`[LEANTIME_ADAPTER] API error: ${data.error.message || JSON.stringify(data.error)}`);
        } else {
          console.error('[LEANTIME_ADAPTER] Invalid response format from Leantime notifications API');
        }
        return [];
      }

      const notifications = this.transformNotifications(data.result, userId);
      console.log('[LEANTIME_ADAPTER] Transformed notifications count:', notifications.length);
      return notifications;
    } catch (error) {
      console.error('[LEANTIME_ADAPTER] Error fetching Leantime notifications:', error);
      return [];
    }
  }

  async getNotificationCount(userId: string): Promise<NotificationCount> {
    console.log(`[LEANTIME_ADAPTER] getNotificationCount called for userId: ${userId}`);
    
    try {
      // Get all notifications and count them
      const notifications = await this.getNotifications(userId, 1, 100); // Get up to 100 for counting
      
      // Count total and unread
      const totalCount = notifications.length;
      const unreadCount = notifications.filter(n => !n.isRead).length;
      
      console.log('[LEANTIME_ADAPTER] Notification counts:', {
        total: totalCount,
        unread: unreadCount
      });
      
      return {
        total: totalCount,
        unread: unreadCount,
        sources: {
          leantime: {
            total: totalCount,
            unread: unreadCount
          }
        }
      };
    } catch (error) {
      console.error('[LEANTIME_ADAPTER] Error fetching notification count:', error);
      return {
        total: 0,
        unread: 0,
        sources: {
          leantime: {
            total: 0,
            unread: 0
          }
        }
      };
    }
  }

  async markAsRead(userId: string, notificationId: string): Promise<boolean> {
    console.log(`[LEANTIME_ADAPTER] markAsRead called for ${notificationId}`);
    
    try {
      // Extract the source ID from our compound ID
      const sourceId = notificationId.replace(`${this.sourceName}-`, '');
      
      // Get user email and ID
      const email = await this.getUserEmail();
      if (!email) {
        console.error('[LEANTIME_ADAPTER] Could not get user email from session');
        return false;
      }
      
      const leantimeUserId = await this.getLeantimeUserId(email);
      if (!leantimeUserId) {
        console.error('[LEANTIME_ADAPTER] User not found in Leantime:', email);
        return false;
      }
      
      // Make request to Leantime API to mark notification as read
      const jsonRpcBody = {
        jsonrpc: '2.0',
        method: 'leantime.rpc.Notifications.Notifications.markNotificationAsRead',
        params: {
          userId: leantimeUserId,
          notificationId: parseInt(sourceId)
        },
        id: 1
      };
      
      const response = await fetch(`${this.apiUrl}/api/jsonrpc`, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'X-API-Key': this.apiToken
        },
        body: JSON.stringify(jsonRpcBody)
      });
      
      if (!response.ok) {
        console.error(`[LEANTIME_ADAPTER] Failed to mark notification as read: ${response.status}`);
        return false;
      }
      
      const data = await response.json();
      return data.result === true || data.result === "true" || !!data.result;
    } catch (error) {
      console.error('[LEANTIME_ADAPTER] Error marking notification as read:', error);
      return false;
    }
  }

  async markAllAsRead(userId: string): Promise<boolean> {
    console.log(`[LEANTIME_ADAPTER] markAllAsRead called for ${userId}`);
    
    try {
      // Get user email and ID
      const email = await this.getUserEmail();
      if (!email) {
        console.error('[LEANTIME_ADAPTER] Could not get user email from session');
        return false;
      }
      
      const leantimeUserId = await this.getLeantimeUserId(email);
      if (!leantimeUserId) {
        console.error('[LEANTIME_ADAPTER] User not found in Leantime:', email);
        return false;
      }
      
      // Make request to Leantime API to mark all notifications as read
      const jsonRpcBody = {
        jsonrpc: '2.0',
        method: 'leantime.rpc.Notifications.Notifications.markAllNotificationsAsRead',
        params: {
          userId: leantimeUserId
        },
        id: 1
      };
      
      const response = await fetch(`${this.apiUrl}/api/jsonrpc`, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'X-API-Key': this.apiToken
        },
        body: JSON.stringify(jsonRpcBody)
      });
      
      if (!response.ok) {
        console.error(`[LEANTIME_ADAPTER] Failed to mark all notifications as read: ${response.status}`);
        return false;
      }
      
      const data = await response.json();
      return data.result === true || data.result === "true" || !!data.result;
    } catch (error) {
      console.error('[LEANTIME_ADAPTER] Error marking all notifications as read:', error);
      return false;
    }
  }

  async isConfigured(): Promise<boolean> {
    return !!(this.apiUrl && this.apiToken);
  }

  private transformNotifications(data: any[], userId: string): Notification[] {
    if (!Array.isArray(data)) {
      return [];
    }

    return data.map(notification => {
      // Determine properties from notification object
      // Adjust these based on actual structure of Leantime notifications
      const id = notification.id || notification._id || notification.notificationId;
      const message = notification.message || notification.text || notification.content || '';
      const type = notification.type || 'notification';
      const read = notification.read || notification.isRead || 0;
      const date = notification.date || notification.datetime || notification.createdDate || new Date().toISOString();
      const url = notification.url || notification.link || '';
      
      return {
        id: `${this.sourceName}-${id}`,
        source: this.sourceName as 'leantime',
        sourceId: id.toString(),
        type: type,
        title: type, // Use type as title if no specific title field
        message: message,
        link: url.startsWith('http') ? url : `${this.apiUrl}${url.startsWith('/') ? '' : '/'}${url}`,
        isRead: read === 1 || read === true,
        timestamp: new Date(date),
        priority: 'normal',
        user: {
          id: userId,
          name: notification.username || notification.userName || ''
        },
        metadata: {
          // Include any other useful fields from notification
          moduleId: notification.moduleId || notification.module || '',
          projectId: notification.projectId || '',
        }
      };
    });
  }

  // Helper function to get user's email directly from the session
  private async getUserEmail(): Promise<string | null> {
    try {
      const session = await getServerSession(authOptions);
      if (!session || !session.user?.email) {
        return null;
      }
      
      return session.user.email;
    } catch (error) {
      console.error('[LEANTIME_ADAPTER] Error getting user email from session:', error);
      return null;
    }
  }

  // Helper function to get Leantime user ID by email
  private async getLeantimeUserId(email: string): Promise<number | null> {
    try {
      if (!this.apiToken) {
        return null;
      }

      const response = await fetch(`${this.apiUrl}/api/jsonrpc`, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'X-API-Key': this.apiToken
        },
        body: JSON.stringify({
          jsonrpc: '2.0',
          method: 'leantime.rpc.users.getAll',
          id: 1
        }),
      });

      if (!response.ok) {
        return null;
      }

      const data = await response.json();
      
      if (!data.result || !Array.isArray(data.result)) {
        return null;
      }

      const users = data.result;
      
      // Find user with matching email (check in both username and email fields)
      const user = users.find((u: any) => 
        u.username === email || 
        u.email === email || 
        (typeof u.username === 'string' && u.username.toLowerCase() === email.toLowerCase())
      );
      
      if (user) {
        return user.id;
      }
      
      return null;
    } catch (error) {
      console.error('[LEANTIME_ADAPTER] Error getting Leantime user ID:', error);
      return null;
    }
  }
}