# CLAUDE.md

This file provides guidance for AI-assisted development 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

# Security & Quality
npm run security:check  # Check for credential leaks
npm run test:build      # Test if build succeeds

# Database Migrations
npm run migrate         # Run pending migrations
npm run migrate:clear   # Clear migration history

# Pre-commit Hook
./scripts/pre-commit.sh # Runs security, build, and test checks
```

## 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

### API Structure
- `/api` - Node.js Express server (runs on EC2)
  - `/server.js` - Main server file
  - `/routes` - API endpoints for filaments, colors, auth
  - Database: PostgreSQL on AWS RDS

### 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

### 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)
}
```

## 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')

### API Server (EC2)
- Manual deployment via `scripts/deploy-api.sh`
- Server: `3.71.161.51`
- Domain: `api.filamenteka.rs`

### Database (RDS PostgreSQL)
- Host: `filamenteka.ci7fsdlbzmag.eu-central-1.rds.amazonaws.com`
- Migrations in `/database/migrations/`
- Schema in `/database/schema.sql`

## Important Patterns

### API Communication
- All API calls use axios interceptors for auth (`src/services/api.ts`)
- Auth token stored in localStorage
- Automatic redirect on 401/403 in admin routes

### Color Management
- Colors defined in `src/data/bambuLabColors.ts` and `bambuLabColorsComplete.ts`
- Automatic row coloring based on filament color
- Special handling for gradient filaments

### State Management
- React hooks for local state
- No global state management library
- Data fetching in components with useEffect

### Testing
- Jest + React Testing Library
- Tests in `__tests__/` directory
- Coverage goal: >80%

## Environment Variables

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

# API Server
DATABASE_URL=postgresql://...
JWT_SECRET=...
NODE_ENV=production
```

## Security Considerations

- Admin routes protected by JWT authentication
- Password hashing with bcrypt
- SQL injection prevention via parameterized queries
- Credential leak detection in pre-commit hooks
- CORS configured for production domains only

## Database Operations

When modifying the database:
1. Create migration file in `/database/migrations/`
2. Test locally first
3. Run migration on production via scripts
4. Update corresponding TypeScript types

## Terraform Infrastructure

Infrastructure as Code in `/terraform/`:
- VPC and networking setup
- EC2 instance for API
- RDS PostgreSQL database
- Application Load Balancer
- ECR for Docker images
- Cloudflare DNS integration