All files / src/modules/savings/services goals.service.ts

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import { Injectable, Logger } from '@nestjs/common';
import { InjectModel } from '@nestjs/mongoose';
import { Model } from 'mongoose';
import { UserSavings, UserSavingsDocument } from '../../../database/schemas/user-savings.schema';
 
export interface SavingsGoal {
  id: string;
  userId: string;
  targetAmount: number;
  currentAmount: number;
  period: 'weekly' | 'monthly' | 'quarterly' | 'yearly' | 'custom';
  deadline: Date;
  description?: string;
  category?: string;
  status: 'active' | 'completed' | 'paused' | 'cancelled';
  progress: number; // percentage
  milestones: Array<{
    amount: number;
    achieved: boolean;
    achievedAt?: Date;
    reward?: string;
  }>;
  createdAt: Date;
  updatedAt: Date;
}
 
@Injectable()
export class GoalsService {
  private readonly logger = new Logger(GoalsService.name);
 
  constructor(
    @InjectModel(UserSavings.name) private userSavingsModel: Model<UserSavingsDocument>,
  ) {}
 
  async createGoal(goalData: Omit<SavingsGoal, 'id' | 'currentAmount' | 'progress' | 'status' | 'milestones' | 'createdAt' | 'updatedAt'>): Promise<SavingsGoal> {
    try {
      const goal: SavingsGoal = {
        ...goalData,
        id: `goal_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`,
        currentAmount: 0,
        progress: 0,
        status: 'active',
        milestones: this.generateMilestones(goalData.targetAmount),
        createdAt: new Date(),
        updatedAt: new Date(),
      };
 
      // Add goal to user savings
      const userSavings = await this.userSavingsModel.findOne({ userId: goalData.userId });
      Iif (userSavings) {
        userSavings.goals.push({
          targetAmount: goal.targetAmount,
          period: goal.period === 'weekly' || goal.period === 'quarterly' || goal.period === 'custom' ? 'monthly' : goal.period,
          progress: goal.progress,
          deadline: goal.deadline,
          achieved: false,
          reward: goal.description || '',
        });
        await userSavings.save();
      }
 
      this.logger.log(`Created savings goal for user ${goalData.userId}: ${goal.targetAmount} AED`);
      return goal;
    } catch (error) {
      this.logger.error('Error creating savings goal', error);
      throw error;
    }
  }
 
  async updateGoalProgress(userId: string, savingsAmount: number): Promise<void> {
    try {
      const userSavings = await this.userSavingsModel.findOne({ userId });
      Iif (!userSavings) return;
 
      // Update progress for all active goals
      for (const goal of userSavings.goals) {
        Iif (!goal.achieved && goal.deadline > new Date()) {
          // Calculate progress based on period
          let relevantSavings = 0;
          switch (goal.period) {
            case 'monthly':
              relevantSavings = userSavings.monthlySaved;
              break;
            case 'yearly':
              relevantSavings = userSavings.yearToDateSaved;
              break;
            default:
              relevantSavings = userSavings.totalSaved;
          }
 
          goal.progress = Math.min((relevantSavings / goal.targetAmount) * 100, 100);
          
          // Check if goal is achieved
          Iif (goal.progress >= 100 && !goal.achieved) {
            goal.achieved = true;
            this.logger.log(`Goal achieved for user ${userId}: ${goal.targetAmount} AED`);
            
            // Award achievement points
            userSavings.achievements.push({
              type: 'goal_achieved',
              title: 'Goal Crusher',
              description: `Achieved savings goal of ${goal.targetAmount} AED`,
              earnedAt: new Date(),
              points: Math.floor(goal.targetAmount / 10), // 1 point per 10 AED
              badge: 'goal-crusher',
            });
          }
        }
      }
 
      await userSavings.save();
    } catch (error) {
      this.logger.error(`Error updating goal progress for user ${userId}`, error);
    }
  }
 
  private generateMilestones(targetAmount: number): SavingsGoal['milestones'] {
    const milestones = [];
    const milestonePercentages = [25, 50, 75, 100];
 
    for (const percentage of milestonePercentages) {
      milestones.push({
        amount: (targetAmount * percentage) / 100,
        achieved: false,
        reward: this.getMilestoneReward(percentage),
      });
    }
 
    return milestones;
  }
 
  private getMilestoneReward(percentage: number): string {
    switch (percentage) {
      case 25:
        return '25 bonus points';
      case 50:
        return '50 bonus points + Bronze badge';
      case 75:
        return '75 bonus points + Silver badge';
      case 100:
        return '100 bonus points + Gold badge + Special discount';
      default:
        return 'Bonus points';
    }
  }
}