[BACKEND] - Add user profile and account management endpoints

[iyanumajekodunmi756]

Issue Reference

Fixes #445 - [BACKEND] - No user profile or account management endpoints

Summary

This PR implements user profile and account management endpoints to address issue #445. The User model exists in src/models/user.rs but was never exposed via HTTP. This implementation provides the necessary endpoints for clients to fetch profiles, update usernames, change avatars, and view their own account details.

Implementation Comparison

Required Endpoints (from #445)

• GET /api/users/{id} — public profile
• GET /api/users/me — authenticated user's own profile
• PUT /api/users/me — update profile (username, avatar)
• GET /api/users/{id}/stats — win/loss record, Elo history

Implementation Details

New Files Created:

1. src/service/user_service.rs (199 lines)

   • UserService with methods for user profile management
   • Database queries for user operations
   • Support for partial profile updates
   • User stats aggregation with win/loss records and Elo history

2. src/http/users.rs (125 lines)

   • HTTP handlers for user endpoints
   • Request/response DTOs
   • Authentication middleware integration
   • Unit tests for request validation

Modified Files:

1. src/service/mod.rs - Added user_service module export
2. src/http/mod.rs - Added users module
3. src/main.rs - Registered user routes under /api/users scope

API Endpoints Implemented

GET /api/users/{id} - Public User Profile

• Returns public profile information for any user
• Excludes sensitive data (email, phone)
• Includes: id, username, display_name, avatar_url, is_verified, created_at, skill_score, fair_play_score

GET /api/users/me - Current User Profile

• Returns full user profile for authenticated user
• Requires JWT authentication via middleware
• Returns all user fields including sensitive data

PUT /api/users/me - Update Profile

• Updates authenticated user's profile
• Supports partial updates (only provided fields are updated)
• Accepts: username, avatar_url, display_name, bio
• Returns updated user object
• Enhancement: Added display_name and bio beyond the basic username/avatar requirement

GET /api/users/{id}/stats - User Statistics

• Returns comprehensive user statistics
• Includes: current_rating, peak_rating, games_played, wins, losses, draws
• Calculates win_rate percentage
• Includes win_streak and loss_streak
• Returns recent Elo history (last 50 matches)
• Defaults to starting rating (1000) if no matches played

Code Quality

• Follows existing codebase patterns and conventions
• Proper error handling with ApiError
• Authentication middleware integration for protected endpoints
• Database queries using sqlx with parameter binding
• Unit tests included for request validation
• Consistent JSON response format with success and data fields

Testing Considerations

The implementation includes basic unit tests for request validation. Additional testing should include:

• Integration tests with actual database
• Authentication/authorization testing
• Edge cases (non-existent users, invalid UUIDs)
• Performance testing for stats endpoint

Breaking Changes

None - this adds new functionality without modifying existing endpoints

Migration Notes

No database migrations required - uses existing tables (users, user_elo, elo_history)

Generated with Devin (https://cli.devin.ai/docs)

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