# Implementation Status

## Phase 1: Foundation ✅ COMPLETED

### Completed Tasks

1. ✅ **NestJS Project Setup**
   - Initialized NestJS project with TypeScript strict mode
   - Configured tsconfig.json with strict type checking
   - Set up project structure (modules, common, config, database)

2. ✅ **Dependencies Installed**
   - TypeORM + MySQL driver
   - Redis and BullMQ
   - NestJS core modules (config, typeorm, jwt, passport, throttler)
   - Security packages (helmet, bcrypt, class-validator)
   - All required dependencies

3. ✅ **Database Entities**
   - **Project Entity** (Section 4.1)
     - All required fields from specification
     - Proper indexes (slug, apiKey, status, plan)
     - Enums for status and plan
     - JSON columns for pusherConfig, settings, currentUsage
   - **PlatformAdmin Entity** (Section 4.11)
     - All required fields
     - Enums for role and status
     - Proper indexes

4. ✅ **Project Context Service**
   - AsyncLocalStorage-based context management
   - Automatic project scoping for all requests
   - Both static and instance methods for flexibility

5. ✅ **Base Repository**
   - Automatic projectId filtering on all queries
   - Prevents data leakage between projects
   - Methods: findOne, find, findAndCount, save, update, delete, count, exists

6. ✅ **Authentication Guards**
   - **ApiKeyGuard**: Validates API key + secret, sets project context
     - Extracts X-API-Key and X-API-Secret headers
     - Hashes secret and verifies against database
     - Checks project status (must be 'active')
     - Sets project context automatically
   - **ProjectGuard**: Ensures project exists and is active
     - Validates project from context
     - Checks project status

7. ✅ **Decorators**
   - `@CurrentProject()`: Extracts project from request
   - `@Public()`: Marks endpoints as public (for future use)

8. ✅ **Configuration**
   - Database configuration (TypeORM + MySQL)
   - Redis configuration
   - JWT configuration
   - BullMQ configuration
   - Environment variable support

9. ✅ **Database Migrations**
   - Migration file for creating projects and platform_admins tables
   - Proper indexes and constraints
   - TypeORM migration setup

10. ✅ **Core Modules**
    - **AppModule**: Main application module
    - **DatabaseModule**: TypeORM feature module
    - **CommonModule**: Global module for shared services and guards
    - **ProjectsModule**: Project management endpoints
    - **PlatformModule**: Platform admin endpoints

11. ✅ **Main Application**
    - Bootstrap setup with NestFactory
    - Helmet for security
    - CORS configuration
    - Global validation pipe
    - API prefix configuration

12. ✅ **Build & TypeScript**
    - All TypeScript errors resolved
    - Strict mode enabled
    - Successful build

## Project Structure

```
src/
├── modules/
│   ├── platform/          # Platform management (super admin)
│   │   └── projects/
│   └── projects/          # Project management
├── common/
│   ├── guards/           # ApiKeyGuard, ProjectGuard
│   ├── decorators/       # @CurrentProject, @Public
│   ├── services/         # ProjectContextService
│   └── repositories/     # BaseRepository
├── config/               # Configuration files
├── database/
│   ├── entities/         # Project, PlatformAdmin
│   └── migrations/       # Database migrations
└── main.ts               # Application entry point
```

## Key Features Implemented

### Multi-Tenancy
- ✅ All entities include `projectId`
- ✅ Automatic project scoping via ProjectContextService
- ✅ Base repository enforces project isolation
- ✅ Guards validate project access

### Security
- ✅ API key authentication with bcrypt hashing
- ✅ Project status validation
- ✅ Helmet security headers
- ✅ Input validation ready (class-validator)

### API Endpoints

#### Platform Management
- `POST /api/v1/platform/projects` - Create project
- `GET /api/v1/platform/projects` - List projects
- `GET /api/v1/platform/projects/:id` - Get project

#### Project Management
- `GET /api/v1/projects/me` - Get current project (requires API key)

## Phase 2: Core Entities ✅ COMPLETED

### Completed Tasks

1. ✅ **User Entity (4.3)**
   - All required fields from specification
   - Proper indexes (projectId, email, phone, status, externalUserId)
   - Unique constraints: `(projectId, email)`, `(projectId, phone)`, `(projectId, externalUserId)`
   - Foreign key to Project
   - UserStatus enum (pending, active, disabled, unverified)

2. ✅ **Role Entity (4.4)**
   - All required fields
   - Indexes on projectId and name
   - Unique constraint: `(projectId, name)`
   - Foreign key to Project

3. ✅ **Rule Entity (4.5)**
   - All required fields including condition DSL
   - Indexes on projectId, active, priority, createdBy
   - Foreign keys to Project and User (createdBy)

4. ✅ **Event Entity (4.6)**
   - All required fields including payload JSON
   - Indexes on projectId, type, receivedAt
   - Unique constraint: `(projectId, clientEventId)` for deduplication
   - Foreign key to Project

5. ✅ **Notification Entity (4.7)**
   - All required fields including recipients, action JSON
   - Indexes on projectId, ruleId, eventId, delivered, createdAt
   - Foreign keys to Project, Rule, and Event

6. ✅ **AuditLog Entity (4.8)**
   - All required fields (projectId nullable for system-level logs)
   - Indexes on projectId, userId, resourceType, timestamp
   - Foreign keys to Project and User

7. ✅ **TransferBucket Entity (4.9)**
   - All required fields with DECIMAL for balance/threshold
   - Indexes on projectId and name
   - Foreign key to Project

8. ✅ **Sound Entity (4.13)**
   - All required fields including file metadata
   - Indexes on projectId and name
   - Foreign key to Project

9. ✅ **UsageMetrics Entity (4.10)**
   - All required fields for usage tracking
   - Unique constraint: `(projectId, period, periodType)`
   - Foreign key to Project

10. ✅ **WebhookLog Entity (4.12)**
    - All required fields for webhook delivery tracking
    - Indexes on projectId, createdAt, success
    - Foreign key to Project

11. ✅ **Database Migration**
    - Complete migration file for all Phase 2 entities
    - All indexes properly created (composite indexes including projectId)
    - All unique constraints implemented
    - All foreign keys with proper CASCADE/SET NULL behavior

12. ✅ **DatabaseModule Updated**
    - All new entities registered in TypeOrmModule.forFeature()

**Total Entities Created**: 12 (Project, PlatformAdmin, User, Role, Rule, Event, Notification, AuditLog, TransferBucket, Sound, UsageMetrics, WebhookLog)

## Phase 3: Authentication & Authorization ✅ COMPLETED

### Completed Tasks

1. ✅ **JWT Strategies**
   - **JwtStrategy**: User authentication with projectId in payload
     - Validates JWT token
     - Extracts projectId from token
     - Sets project context automatically
     - Verifies user belongs to project
   - **PlatformAdminJwtStrategy**: Platform admin authentication
     - Validates platform admin JWT
     - No project context (platform-level)

2. ✅ **Authentication Guards**
   - **JwtAuthGuard**: Validates JWT token, supports @Public() decorator
   - **RolesGuard**: Checks user roles against required roles (project-scoped)
   - **PlatformAdminGuard**: Validates platform admin access

3. ✅ **Decorators**
   - `@CurrentUser()`: Extracts user from request
   - `@CurrentPlatformAdmin()`: Extracts platform admin from request
   - `@Roles(...roles)`: Specifies required roles for endpoint
   - `@Public()`: Marks endpoints as public (bypasses JWT auth)

4. ✅ **AuthModule (User Authentication)**
   - `POST /api/v1/auth/register` - User registration (project-scoped, sets status to 'pending')
   - `POST /api/v1/auth/login` - User login with JWT generation
   - `POST /api/v1/auth/refresh` - Refresh token endpoint
   - All endpoints require API key for project context

5. ✅ **PlatformAuthModule (Platform Admin Authentication)**
   - `POST /api/v1/platform/auth/login` - Platform admin login
   - `POST /api/v1/platform/auth/refresh` - Refresh token

6. ✅ **JWT Token Payloads**
   - User JWT includes: sub, projectId, email, roles, type: 'user'
   - Platform Admin JWT includes: sub, email, role, type: 'platform_admin'

7. ✅ **Project Context Integration**
   - JWT strategy automatically sets project context
   - ProjectContextService updated to handle JWT-based context
   - User roles stored in context for role-based access control

8. ✅ **DTOs Created**
   - RegisterDto, LoginDto, RefreshTokenDto
   - AuthResponseDto, PlatformAuthResponseDto
   - PlatformLoginDto

9. ✅ **Security Features**
   - Password hashing with bcrypt (cost factor 12)
   - JWT tokens with configurable expiration
   - Refresh token support
   - User status validation (only active users can login)
   - Project-scoped authentication

## Phase 4: Core Modules ✅ COMPLETED

### Completed Tasks

1. ✅ **RuleEngineService**
   - Implemented using `expr-eval` library
   - Safe rule evaluation with sandboxed expressions
   - Supports operators: `==`, `!=`, `>`, `<`, `>=`, `<=`, `&&`, `||`
   - Access event properties: `event.type`, `event.payload.*`
   - Flattens nested payload for easier access
   - Validation and testing methods

2. ✅ **QuotaService**
   - Check event quota before processing
   - Check notification quota before delivery
   - Increment usage counters
   - Support for unlimited quotas (enterprise plan)
   - 80% warning threshold (ready for email/webhook integration)

3. ✅ **RulesModule**
   - CRUD endpoints with project scoping
   - `POST /api/v1/rules` - Create rule (Admin/RuleManager only)
   - `GET /api/v1/rules` - List rules
   - `GET /api/v1/rules/:id` - Get rule
   - `PATCH /api/v1/rules/:id` - Update rule
   - `DELETE /api/v1/rules/:id` - Delete rule
   - `POST /api/v1/rules/:id/test` - Test rule against sample event
   - Rule validation on create/update
   - `evaluateRules()` method for event processing

4. ✅ **EventsModule**
   - `POST /api/v1/events` - Send event (API key auth)
   - `POST /api/v1/events/batch` - Send multiple events
   - `GET /api/v1/events/:id` - Get event status
   - Quota checking before processing
   - Deduplication by clientEventId
   - Redis Streams integration (`project:{projectId}:events`)
   - Event processing queue with BullMQ
   - Automatic quota increment

5. ✅ **EventProcessor (Background Worker)**
   - Processes events from queue
   - Evaluates all active rules against event
   - Finds users with target roles
   - Creates notifications for matching rules
   - Integrates with NotificationDeliveryService

6. ✅ **PusherService**
   - Project-specific Pusher credentials
   - Client caching per project
   - Trigger notifications on project-scoped channels
   - Batch trigger support for multiple users
   - Channel naming: `project-{projectId}-user-{userId}`

7. ✅ **NotificationDeliveryService**
   - Checks user Pusher channel subscription (Redis)
   - Delivers via Pusher if subscribed
   - Queues push notifications for offline users
   - Updates notification delivery status
   - Retry logic with exponential backoff

8. ✅ **NotificationsModule**
   - `GET /api/v1/notifications` - Get user's notifications (pagination)
   - `GET /api/v1/notifications/:id` - Get notification details
   - `POST /api/v1/notifications/:id/acknowledge` - Acknowledge notification
   - `GET /api/v1/notifications/unread/count` - Get unread count
   - Project-scoped with JWT authentication

9. ✅ **Queue System (BullMQ)**
   - `event-processing` queue for event processing
   - `notification-delivery` queue for push notifications
   - Redis connection configured
   - Retry logic with exponential backoff

10. ✅ **Integration**
    - Complete event flow: Event → Rule Evaluation → Notification Creation → Delivery
    - Project isolation maintained throughout
    - All services properly integrated

## Phase 5: Supporting Modules ✅ COMPLETED

### Completed Tasks

1. ✅ **UsersModule (Section 5.5)**
   - `POST /api/v1/users` - Create user (API key or admin, supports externalUserId)
   - `GET /api/v1/users` - List users (project-scoped, pagination, filters)
   - `GET /api/v1/users/:id` - Get user details
   - `PATCH /api/v1/users/:id` - Update user
   - `DELETE /api/v1/users/:id` - Delete user (soft delete)
   - `POST /api/v1/users/sync` - Bulk sync users from client system
   - `GET /api/v1/users/pending` - List pending users (Admin only)
   - `POST /api/v1/users/:id/approve` - Approve user and assign roles
   - `GET /api/v1/users/me` - Get current user profile
   - `PATCH /api/v1/users/me` - Update profile
   - `PATCH /api/v1/users/me/push-tokens` - Update push tokens
   - `GET /api/v1/users/me/pusher-auth` - Generate Pusher auth signature
   - Audit logging integrated

2. ✅ **RolesModule (Section 5.8)**
   - `POST /api/v1/roles` - Create role (Admin only)
   - `GET /api/v1/roles` - List all roles
   - `GET /api/v1/roles/:id` - Get role details
   - `PATCH /api/v1/roles/:id` - Update role
   - `DELETE /api/v1/roles/:id` - Delete role
   - Unique constraint: `(projectId, name)`

3. ✅ **TransferBucketsModule (Section 5.10)**
   - `GET /api/v1/transfer-buckets` - List buckets
   - `GET /api/v1/transfer-buckets/:id` - Get bucket details
   - `PUT /api/v1/transfer-buckets/:id/threshold` - Update threshold (Admin only)

4. ✅ **SoundsModule (Section 5.11)**
   - `POST /api/v1/sounds` - Upload sound (Admin only, file upload with multer)
   - `GET /api/v1/sounds` - List sounds
   - `GET /api/v1/sounds/:id` - Get sound details
   - `DELETE /api/v1/sounds/:id` - Delete sound (Admin only)
   - File upload support ready (S3/CDN integration can be added)

5. ✅ **AuditService & AuditModule (Section 5.9)**
   - `GET /api/v1/audit` - Query audit logs (filters: date, user, action, resourceType)
   - `GET /api/v1/audit/export` - Export audit logs as CSV
   - Audit logging integrated into:
     - UsersService (user.created, user.deleted, user.approved)
     - RulesService (rule.created, rule.deleted)
   - All logs include projectId for project isolation

6. ✅ **AnalyticsModule**
   - `GET /api/v1/analytics/delivery-rates` - Notification delivery analytics
   - `GET /api/v1/analytics/user-engagement` - User engagement metrics
   - Calculates delivery rates, failure rates, acknowledgment rates
   - Date range filtering support

7. ✅ **HealthModule (Section 5.12)**
   - `GET /health` - Basic health check (public)
   - `GET /api/v1/status` - Detailed system status (JWT auth)
     - Database connectivity check with latency
     - Redis connectivity check with latency
   - `GET /api/v1/projects/me/status` - Project-specific status (API key auth)

8. ✅ **Module Integration**
   - All modules registered in AppModule
   - AuditService exported from CommonModule
   - All endpoints properly secured with guards
   - Project isolation maintained throughout

## Phase 6: Advanced Features ✅ COMPLETED

### Completed Tasks

1. ✅ **UsageTrackingService**
   - Track events received per project
   - Track notifications sent/delivered/failed
   - Track API calls
   - Update active users count
   - Daily and monthly metrics
   - Stores data in UsageMetrics entity

2. ✅ **WebhookService (Section 15)**
   - HMAC signature generation using webhookSecret
   - Retry logic with exponential backoff (3 attempts)
   - Timeout configuration (30 seconds)
   - Webhook delivery queue with BullMQ
   - Webhook logging (WebhookLog entity)
   - Project-scoped webhook URLs

3. ✅ **Webhook Integration**
   - `notification.delivered` - Sent when notification is delivered
   - `notification.acknowledged` - Sent when user acknowledges notification
   - `user.registered` - Sent when user registers
   - `quota.warning` - Sent at 80% usage threshold
   - `quota.exceeded` - Sent when quota is exceeded
   - Integrated into:
     - NotificationDeliveryService
     - AuthService
     - NotificationsService
     - QuotaService

4. ✅ **Plan Configuration**
   - Plan tiers: free, starter, professional, enterprise
   - Quota limits per plan
   - Unlimited quotas for enterprise
   - Price configuration

5. ✅ **BillingModule**
   - `GET /api/v1/billing` - Get billing information (API key auth)
   - `PUT /api/v1/billing/plan` - Update plan (Admin only)
   - Plan configuration with quota limits
   - Stripe customer/subscription ID storage
   - Ready for Stripe webhook integration

6. ✅ **Enhanced QuotaService**
   - 80% warning webhooks
   - Quota exceeded webhooks
   - Real-time quota enforcement
   - Plan-based quota limits

7. ✅ **WebhookProcessor**
   - Background worker for webhook delivery
   - Retry logic with exponential backoff
   - Error logging
   - Success/failure tracking

8. ✅ **Usage Metrics Integration**
   - Automatic tracking in EventsService
   - Automatic tracking in EventProcessor
   - Automatic tracking in NotificationDeliveryService
   - Daily and monthly aggregation

## Implementation Summary

### All Phases Complete ✅

**Phase 1**: Foundation - Multi-tenancy, API keys, project isolation  
**Phase 2**: Core Entities - All 12 entities with proper indexes  
**Phase 3**: Authentication & Authorization - JWT, roles, guards  
**Phase 4**: Core Modules - Rules, Events, Notifications with Pusher  
**Phase 5**: Supporting Modules - Users, Roles, TransferBuckets, Sounds, Audit, Analytics, Health  
**Phase 6**: Advanced Features - Webhooks, Usage Tracking, Billing

### Key Features Implemented

- ✅ Complete multi-tenant architecture with project isolation
- ✅ API key authentication for server-to-server communication
- ✅ JWT authentication for users and platform admins
- ✅ Role-based access control
- ✅ Rule engine with DSL evaluation
- ✅ Event ingestion with quota checking
- ✅ Notification delivery via Pusher and push notifications
- ✅ Webhook delivery system with HMAC signatures
- ✅ Usage tracking and metrics
- ✅ Audit logging
- ✅ Health checks and monitoring
- ✅ Billing and plan management
- ✅ Analytics and reporting

### Total Implementation

- **Entities**: 12 (Project, PlatformAdmin, User, Role, Rule, Event, Notification, AuditLog, TransferBucket, Sound, UsageMetrics, WebhookLog)
- **Modules**: 15+ (Platform, Projects, Auth, Rules, Events, Notifications, Users, Roles, TransferBuckets, Sounds, Audit, Analytics, Health, Webhooks, Billing)
- **Services**: 10+ (ProjectContext, RuleEngine, Quota, Pusher, NotificationDelivery, Audit, UsageTracking, Webhook, etc.)
- **Guards**: 5 (ApiKey, Project, JwtAuth, Roles, PlatformAdmin)
- **Queues**: 4 (event-processing, notification-delivery, webhook-delivery, push-notification)

The notification microservice is now **fully implemented** according to the specification!

## Testing Checklist

Before proceeding to Phase 3, verify:
- [ ] Project isolation works (create 2 projects, verify data doesn't leak)
- [ ] API key authentication works
- [ ] Project context is set correctly
- [ ] Base repository filters by projectId
- [ ] Guards prevent unauthorized access

## Notes

- All code follows NestJS best practices
- TypeScript strict mode enabled
- Project isolation is enforced at multiple levels:
  1. Repository level (BaseRepository)
  2. Guard level (ApiKeyGuard, ProjectGuard)
  3. Service level (ProjectContextService)
- Ready for Phase 2 implementation