# CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

## Project Overview

Filamenteka is a 3D printing filament inventory management system for tracking Bambu Lab filaments. It consists of:
- **Frontend**: Next.js app with React, TypeScript, and Tailwind CSS (static export)
- **Backend**: Node.js API server with PostgreSQL database
- **Infrastructure**: AWS (Amplify for frontend, EC2 for API, RDS for database)

## Critical Rules

- NEVER mention ANY author in commits. No author tags or attribution
- NEVER mention AI/assistant names anywhere
- Keep commit messages clean and professional with NO attribution
- Build for AMD64 Linux when deploying (development is on ARM macOS)
- Always run security checks before commits

## Common Commands

```bash
# Development
npm run dev              # Start Next.js development server (port 3000)
npm run build            # Build static export to /out directory
npm run lint             # Run ESLint
npm test                 # Run Jest tests
npm run test:watch       # Run Jest in watch mode

# Security & Quality
npm run security:check   # Check for credential leaks (scripts/security/security-check.js)
npm run test:build       # Test if build succeeds without creating files
./scripts/pre-commit.sh  # Runs security, build, and test checks (triggered by husky)

# Database Migrations
npm run migrate          # Run pending migrations locally
npm run migrate:clear    # Clear migration history (development only)
scripts/update-db-via-aws.sh  # Run migrations on production RDS via EC2

# Deployment
scripts/deploy-api-update.sh  # Deploy API to EC2 via AWS SSM (recommended)
scripts/deploy-frontend.sh    # Manual frontend deployment helper
```

## Architecture

### Frontend Structure (Next.js App Router)
- `/app` - Next.js 13+ app directory structure
  - `/page.tsx` - Public filament inventory table
  - `/upadaj` - Admin panel (password protected)
    - `/page.tsx` - Admin login
    - `/dashboard/page.tsx` - Filament CRUD operations
    - `/colors/page.tsx` - Color management
    - `/requests/page.tsx` - Customer color requests
- `/src` - Source files
  - `/components` - React components
  - `/services/api.ts` - Axios instance with auth interceptors
  - `/data` - Color definitions (bambuLabColors.ts, bambuLabColorsComplete.ts)
  - `/types` - TypeScript type definitions

### API Structure
- `/api` - Node.js Express server (runs on EC2, port 80)
  - `/server.js` - Main Express server with all routes inline
  - Database: PostgreSQL on AWS RDS
  - Endpoints: `/api/login`, `/api/filaments`, `/api/colors`, `/api/sale/bulk`, `/api/color-requests`

### Key Components
- `FilamentTableV2` - Main inventory display with sorting/filtering
- `SaleManager` - Bulk sale management interface
- `ColorCell` - Smart color rendering with gradient support
- `EnhancedFilters` - Advanced filtering system
- `ColorRequestForm` - Customer color request form
- `ColorRequestModal` - Modal for color requests

### Data Models

#### Filament Schema (PostgreSQL)
```sql
filaments: {
  id: UUID,
  tip: VARCHAR(50),        # Material type (PLA, PETG, ABS)
  finish: VARCHAR(50),     # Finish type (Basic, Matte, Silk)
  boja: VARCHAR(100),      # Color name
  refill: INTEGER,         # Refill spool count
  spulna: INTEGER,         # Regular spool count
  kolicina: INTEGER,       # Total quantity (refill + spulna)
  cena: VARCHAR(50),       # Price
  sale_active: BOOLEAN,    # Sale status
  sale_percentage: INTEGER,# Sale discount
  sale_end_date: TIMESTAMP # Sale expiry
}
```

#### Color Schema
```sql
colors: {
  id: UUID,
  name: VARCHAR(100),      # Color name (must match filament.boja)
  hex: VARCHAR(7),         # Hex color code
  cena_refill: INTEGER,    # Refill price (default: 3499)
  cena_spulna: INTEGER     # Regular price (default: 3999)
}
```

#### Color Requests Schema
```sql
color_requests: {
  id: UUID,
  color_name: VARCHAR(255), # Requested color name
  message: TEXT,            # Customer message
  contact_name: VARCHAR(255), # Customer name (required)
  contact_phone: VARCHAR(50), # Customer phone (required)
  status: VARCHAR(20),      # Status: pending, reviewed, fulfilled
  created_at: TIMESTAMP
}
```

## Deployment

### Frontend (AWS Amplify)
- Automatic deployment on push to main branch
- Build output: Static files in `/out` directory
- Config: `amplify.yml`, `next.config.js` (output: 'export')
- Security check runs during build (amplify.yml preBuild phase)

### API Server (EC2)
- Deployment via `scripts/deploy-api-update.sh` (uses AWS SSM to push updates)
- Instance ID: `i-03956ecf32292d7d9`
- Server IP: `3.71.161.51`
- Domain: `api.filamenteka.rs`
- Service: `node-api` (systemd)
- Deploy script pulls from GitHub main branch and restarts service
- IMPORTANT: When deploying API, remember to build for AMD64 Linux (not ARM macOS)

### Database (RDS PostgreSQL)
- Host: `filamenteka.ci7fsdlbzmag.eu-central-1.rds.amazonaws.com`
- User: `filamenteka_admin`
- Database: `filamenteka`
- Migrations in `/database/migrations/`
- Schema in `/database/schema.sql`
- Use `scripts/update-db-via-aws.sh` for running migrations on production

## Important Patterns

### API Communication
- All API calls organized in service modules (`src/services/api.ts`)
- Services: `authService`, `colorService`, `filamentService`, `colorRequestService`
- Axios instance with interceptors for automatic auth token injection
- Auth token stored in localStorage with 24h expiry
- Automatic redirect on 401/403 in admin routes (via response interceptor)
- Cache busting on filament fetches with timestamp query param

### Color Management
- Frontend color mappings in `src/data/bambuLabColors.ts` and `bambuLabColorsComplete.ts`
- Database color definitions in `colors` table with pricing (cena_refill, cena_spulna)
- ColorMapping interface supports both solid colors (hex string) and gradients (hex array)
- Automatic row coloring via ColorCell component based on filament.boja
- Special handling for gradient filaments (e.g., Cotton Candy Cloud)
- Foreign key constraint: filaments.boja → colors.name (ON UPDATE CASCADE)

### State Management
- React hooks for local component state
- No global state management library
- Data fetching in components with useEffect
- Service layer handles all API interactions

### Testing
- Jest + React Testing Library
- Tests in `__tests__/` directory
- Config: `jest.config.js`, `jest.setup.js`
- Coverage goal: >80%
- Run with `npm test` or `npm run test:watch`
- Tests include: component tests, API integration tests, data consistency checks

## Environment Variables

```bash
# Frontend (.env.local)
NEXT_PUBLIC_API_URL=https://api.filamenteka.rs/api

# API Server (.env in /api directory)
DATABASE_URL=postgresql://filamenteka_admin:PASSWORD@filamenteka.ci7fsdlbzmag.eu-central-1.rds.amazonaws.com:5432/filamenteka
JWT_SECRET=...
ADMIN_PASSWORD=...
NODE_ENV=production
PORT=80
```

## Security Considerations

- **Authentication**: JWT tokens with 24h expiry (hardcoded admin user for now)
- **Password**: Stored in environment variable ADMIN_PASSWORD (bcrypt ready for multi-user)
- **SQL Injection**: Prevented via parameterized queries in all database operations
- **Credential Leak Detection**: Pre-commit hook runs `scripts/security/security-check.js`
- **CORS**: Currently allows all origins (origin: true) - consider hardening for production
- **Auth Interceptors**: Automatic 401/403 handling with redirect to login
- **Pre-commit Checks**: Husky runs `scripts/pre-commit.sh` which executes:
  1. Author mention check (blocks commits with attribution)
  2. Security check (credential leaks)
  3. Build test (ensures code compiles)
  4. Unit tests (Jest with --passWithNoTests)

## Development Workflows

### Adding New Colors
1. Add color to database via admin panel (`/upadaj/colors`) OR via migration
2. Update frontend color mappings in `src/data/bambuLabColors.ts`:
   ```typescript
   'Color Name': { hex: '#HEXCODE' }  // Solid color
   'Gradient Name': { hex: ['#HEX1', '#HEX2'], isGradient: true }  // Gradient
   ```
3. Color names must match exactly between database and filament.boja

### Database Migrations
When modifying the database:
1. Create migration file in `/database/migrations/` with sequential numbering (e.g., `019_add_new_feature.sql`)
2. Test locally first with `npm run migrate`
3. Run migration on production:
   - Use `scripts/update-db-via-aws.sh` for remote execution via EC2
   - Or SSH to EC2 and run migration directly
4. Update corresponding TypeScript types in `/src/types/`

Important database constraints:
- `filaments.boja` has foreign key to `colors.name` (ON UPDATE CASCADE)
- `filaments.kolicina` has check constraint: `kolicina = refill + spulna`
- Always update `colors` table first before adding filaments with new colors

### API Deployment Workflow
1. Make changes to `/api/server.js`
2. Commit and push to main branch
3. Run `./scripts/deploy-api-update.sh` (uses AWS SSM to pull from GitHub and restart)
4. Verify deployment: `curl https://api.filamenteka.rs/` should return `{"status":"ok"}`

### Frontend Deployment Workflow
1. Make changes to app/components/pages
2. Test locally: `npm run dev`
3. Run pre-commit checks: `./scripts/pre-commit.sh`
4. Commit and push to main branch
5. AWS Amplify automatically builds and deploys (monitors main branch)

## Infrastructure

### Terraform (IaC)
Infrastructure as Code in `/terraform/`:
- **VPC**: `vpc.tf` - Network setup with subnets and routing
- **EC2**: `ec2-api.tf` - API server instance (i-03956ecf32292d7d9)
- **RDS**: `rds.tf` - PostgreSQL database
- **ALB**: `alb.tf` - Application Load Balancer
- **ECR**: `ecr.tf` - Docker image registry
- **CloudFront**: `cloudfront-frontend.tf` - Frontend CDN distribution
- **Cloudflare**: `cloudflare-api.tf` - DNS integration for api.filamenteka.rs
- **Configuration**: `variables.tf`, `outputs.tf`, `main.tf`

### Current Stack
- **Frontend**: AWS CloudFront + S3 (static Next.js export)
- **API**: EC2 instance running Node.js/Express with systemd service
- **Database**: AWS RDS PostgreSQL (eu-central-1)
- **DNS**: Cloudflare for api.filamenteka.rs
- **Deployment**: AWS Amplify for frontend, SSM for API updates