import logger from '@utils/logger';

export type ActivityEntry = {
  requestId: string;
  type: 'created' | 'assignment' | 'approval' | 'rejection' | 'status_change' | 'comment' | 'reminder' | 'document_added' | 'sla_warning';
  user?: { userId: string; name?: string; email?: string };
  timestamp: string;
  action: string;
  details: string;
  metadata?: any;
};

class ActivityService {
  private byRequest: Map<string, ActivityEntry[]> = new Map();

  async log(entry: ActivityEntry) {
    const list = this.byRequest.get(entry.requestId) || [];
    list.push(entry);
    this.byRequest.set(entry.requestId, list);
    
    // Persist to database
    try {
      const { Activity } = require('@models/Activity');
      const userName = entry.user?.name || entry.user?.email || null;
      
      const activityData = {
        requestId: entry.requestId,
        userId: entry.user?.userId || null,
        userName: userName,
        activityType: entry.type,
        activityDescription: entry.details,
        activityCategory: null,
        severity: null,
        metadata: entry.metadata || null,
        isSystemEvent: !entry.user,
        ipAddress: null,
        userAgent: null,
      };
      
      logger.info(`[Activity] Creating activity:`, { 
        requestId: entry.requestId, 
        userName, 
        userId: entry.user?.userId,
        type: entry.type 
      });
      
      await Activity.create(activityData);
      
      logger.info(`[Activity] Successfully logged activity for request ${entry.requestId} by user: ${userName}`);
    } catch (error) {
      logger.error('[Activity] Failed to persist activity:', error);
    }
  }

  get(requestId: string): ActivityEntry[] {
    return this.byRequest.get(requestId) || [];
  }
}

export const activityService = new ActivityService();