Build Event-Driven Daily Streak System with Gamified Milestone Rewards

[LaGodxy]

🎯 Daily Streak System Implementation

📋 Overview

This PR implements a comprehensive daily streak system that rewards users for solving at least one puzzle per day. The system tracks consecutive days of participation, resets if a day is missed, and provides bonus XP or tokens for milestone streaks.

✨ Features Added

🏆 Core Streak Functionality

• Daily Streak Tracking: Tracks consecutive days of puzzle solving
• Automatic Reset: Resets streak when a day is skipped
• Milestone Rewards: Awards bonus XP and tokens at 3, 7, 14, 30, 60, 100-day streaks
• Longest Streak Tracking: Maintains record of user's longest streak

🎮 Event-Driven Integration

• Puzzle System Integration: Automatically updates streaks when puzzles are solved correctly
• IQ Assessment Integration: Updates streaks when IQ questions are answered correctly
• Loose Coupling: Uses NestJS event emitter for clean separation of concerns

📊 API Endpoints

• GET /streak - Get current user streak status
• GET /streak/leaderboard - Get streak leaderboard with pagination
• GET /streak/stats - Get admin statistics (total users, active users, average streak, top streak)

�� Leaderboard System

• Shows top streak holders
• Paginated results
• Sorted by current streak, then longest streak, then last active date

��️ Architecture

New Components

1. DailyStreak Entity (src/gamification/entities/daily-streak.entity.ts)

   • Database model for tracking user streaks
   • Tracks current streak, longest streak, and milestone progress

2. DailyStreakService (src/gamification/providers/daily-streak.service.ts)

   • Core business logic for streak management
   • Handles streak updates, milestone checking, and leaderboard queries

3. StreakController (src/gamification/controllers/streak.controller.ts)

   • REST API endpoints with Swagger documentation
   • Protected with JWT authentication

4. StreakListener (src/gamification/listeners/streak.listener.ts)

   • Event listener for puzzle and IQ question submissions
   • Automatically updates streaks when users solve puzzles correctly

5. Constants (src/gamification/constants/streak.constants.ts)

   • Configuration for milestones and rewards
   • Event names and system configuration

Database Changes

• New Table: daily_streaks with proper indexes for performance
• Migration: 20250601204323-CreateDailyStreaksTable.ts
• Foreign Key: Links to existing user table

�� Milestone System

Streak Days	XP Reward	Token Reward	Description
3	50	5	3-Day Streak
7	150	15	7-Day Streak
14	300	30	14-Day Streak
30	600	60	30-Day Streak
60	1200	120	60-Day Streak
100	2000	200	100-Day Streak

🔧 Technical Implementation

Event System

• Events Emitted:
  • puzzle.submitted: When a puzzle is submitted
  • iq.question.answered: When an IQ question is answered
  • streak.puzzle.solved: When a streak is updated
  • streak.milestone.reached: When a milestone is reached

Error Handling

• Streak updates don't break puzzle submission flow
• Graceful error handling in event listeners
• Comprehensive logging for debugging

Performance Optimizations

• Database indexes on user_id, streak_count, longest_streak, last_active_date
• Efficient leaderboard queries with pagination
• Idempotent streak updates (only once per day)

🧪 Testing

Unit Tests Added

• daily-streak.service.spec.ts - Core streak logic tests
• streak.listener.spec.ts - Event handling tests
• streak.controller.spec.ts - API endpoint tests
• puzzle.service.spec.ts - Puzzle integration tests

Test Coverage

• ✅ Streak creation for new users
• ✅ Streak increment for consecutive days
• ✅ Streak reset when day is skipped
• ✅ Milestone reward awarding
• ✅ Leaderboard functionality
• ✅ Error handling scenarios

�� Documentation

API Documentation

• Complete Swagger documentation for all endpoints
• Request/response examples
• Authentication requirements

README

• Comprehensive documentation in src/gamification/README.md
• Usage examples for frontend integration
• Configuration instructions
• Best practices

�� Integration Points

Existing Systems Enhanced

• Puzzle System: Now emits events for streak tracking
• IQ Assessment: Now emits events for streak tracking
• Gamification: Enhanced with milestone reward system
• User System: Integrated with existing user entities

Backward Compatibility

• ✅ No breaking changes to existing APIs
• ✅ Existing puzzle and IQ assessment functionality unchanged
• ✅ Optional feature - doesn't affect users who don't use streaks

�� Deployment Notes

Database Migration

# Run the new migration
npm run migration:run

Environment Variables

No additional environment variables required. Uses existing database and JWT configuration.

Dependencies

• Added @nestjs/event-emitter (already in package.json)
• No new external dependencies

�� Benefits

User Engagement

• Motivation: Daily streaks encourage regular puzzle solving
• Achievement: Milestone rewards provide sense of progress
• Competition: Leaderboard fosters healthy competition

Technical Benefits

• Scalable: Event-driven architecture supports future enhancements
• Maintainable: Clean separation of concerns
• Testable: Comprehensive test coverage
• Performance: Optimized database queries and indexes

🔮 Future Enhancements

• Streak multipliers for longer streaks
• Special challenges for maintaining streaks
• Push notifications for streak reminders
• Social features for sharing streak achievements
• More detailed analytics and insights

✅ Acceptance Criteria Met

• User's streak updates only once per day on first puzzle submission
• Streak resets properly when a day is skipped
• Milestone rewards are applied correctly
• API endpoints return correct streak data
• All logic is covered with tests
• Event-driven architecture implemented
• Swagger documentation and auth guards added

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Ready for Review 🚀

closes #76

[phertyameen]

This us superb. glad to have you as a contributor