version: '3.9'

# ============================================================================
# PostgreSQL Admin Panel - Complete Stack
# ============================================================================
# Services:
#   - postgres: PostgreSQL 16 database
#   - pgadmin: Node.js application
# 
# Usage:
#   docker-compose up --build        # Build and start
#   docker-compose down              # Stop and remove
#   docker-compose logs -f           # View logs
#   docker-compose ps                # Status
# ============================================================================

services:
  # =========================================================================
  # PostgreSQL Database Service
  # =========================================================================
  postgres:
    image: postgres:16-alpine
    container_name: pg-admin-postgres
    restart: unless-stopped
    
    # Network Settings
    ports:
      - "5432:5432"
    networks:
      - pgadmin-network
    
    # Environment Configuration
    environment:
      # Database initialization
      POSTGRES_DB: ${DB_NAME:-postgres}
      POSTGRES_USER: ${DB_USER:-postgres}
      POSTGRES_PASSWORD: ${DB_PASSWORD:-postgres}
      
      # PostgreSQL configuration
      POSTGRES_INITDB_ARGS: >
        -c max_connections=200
        -c shared_buffers=256MB
        -c effective_cache_size=1GB
        -c log_statement=all
    
    # Volume Management
    volumes:
      # Persist database files
      - postgres_data:/var/lib/postgresql/data
    
    # Health Check
    healthcheck:
      test: ["CMD-SHELL", "pg_isready -U ${DB_USER:-postgres} -d ${DB_NAME:-postgres}"]
      interval: 10s
      timeout: 5s
      retries: 5
      start_period: 10s
  
  # =========================================================================
  # PostgreSQL Admin Panel Application
  # =========================================================================
  pgadmin:
    build:
      context: .
      dockerfile: Dockerfile
      # Build arguments
      args:
        NODE_ENV: production
    
    container_name: pg-admin-app
    restart: unless-stopped
    
    # Network Settings
    ports:
      - "3000:3000"
    networks:
      - pgadmin-network
    
    # Depends On
    depends_on:
      postgres:
        condition: service_healthy
    
    # Environment Configuration
    environment:
      # Application Settings
      NODE_ENV: ${NODE_ENV:-production}
      PORT: 3000
      
      # Database Connection
      DB_HOST: postgres
      DB_PORT: 5432
      DB_NAME: ${DB_NAME:-postgres}
      DB_USER: ${DB_USER:-postgres}
      DB_PASSWORD: ${DB_PASSWORD:-postgres}
      
      # Security
      SESSION_SECRET: ${SESSION_SECRET:-change-this-in-production-to-random-string}
    
    # Volume Management (development - can be removed in production)
    volumes:
      # Code synchronization
      - ./public:/app/public:ro
      - ./src:/app/src:ro
      # Node modules persistence
      - /app/node_modules
    
    # Resource Limits
    # Uncomment for production to limit resources
    # deploy:
    #   resources:
    #     limits:
    #       cpus: '1'
    #       memory: 512M
    #     reservations:
    #       cpus: '0.5'
    #       memory: 256M
    
    # Health Check
    healthcheck:
      test: ["CMD", "curl", "-f", "http://localhost:3000"]
      interval: 30s
      timeout: 10s
      retries: 3
      start_period: 40s
    
    # Logging Configuration
    logging:
      driver: "json-file"
      options:
        max-size: "10m"
        max-file: "3"

# ============================================================================
# Volumes Definition
# ============================================================================
volumes:
  postgres_data:
    driver: local
    driver_opts:
      type: none
      o: bind
      device: ${PWD}/postgres_data

# ============================================================================
# Networks Definition
# ============================================================================
networks:
  pgadmin-network:
    driver: bridge
    ipam:
      config:
        - subnet: 172.20.0.0/16