#version: '3.8'

# ============================================================================
# Recticel Quality Application - Docker Compose Configuration
# Production-ready with mapped volumes for code, data, and backups
# ============================================================================

services:
  # ==========================================================================
  # MariaDB Database Service
  # ==========================================================================
  db:
    image: mariadb:11.3
    container_name: quality-app-db
    restart: unless-stopped
    
    environment:
      MYSQL_ROOT_PASSWORD: ${MYSQL_ROOT_PASSWORD}
      MYSQL_DATABASE: ${DB_NAME}
      MYSQL_USER: ${DB_USER}
      MYSQL_PASSWORD: ${DB_PASSWORD}
      MYSQL_INNODB_BUFFER_POOL_SIZE: ${MYSQL_BUFFER_POOL}
      MYSQL_MAX_CONNECTIONS: ${MYSQL_MAX_CONNECTIONS}
    
    ports:
      - "${DB_PORT}:3306"
    
    volumes:
      # Database data persistence - CRITICAL: Do not delete this volume
      - ${DB_DATA_PATH}:/var/lib/mysql
      # Database initialization script
      - ./init-db.sql:/docker-entrypoint-initdb.d/01-init.sql:ro
      # Backup folder mapped for easy database dumps
      - ${BACKUP_PATH}:/backups
    
    networks:
      - quality-app-network
    
    healthcheck:
      test: ["CMD", "healthcheck.sh", "--connect", "--innodb_initialized"]
      interval: 10s
      timeout: 5s
      retries: 5
      start_period: 30s
    
    deploy:
      resources:
        limits:
          cpus: ${DB_CPU_LIMIT}
          memory: ${DB_MEMORY_LIMIT}
        reservations:
          cpus: ${DB_CPU_RESERVATION}
          memory: ${DB_MEMORY_RESERVATION}
    
    logging:
      driver: json-file
      options:
        max-size: ${LOG_MAX_SIZE}
        max-file: ${DB_LOG_MAX_FILES}

  # ==========================================================================
  # Flask Web Application Service
  # ==========================================================================
  web:
    build:
      context: .
      dockerfile: Dockerfile
      args:
        BUILD_DATE: ${BUILD_DATE}
        VERSION: ${VERSION}
        VCS_REF: ${VCS_REF}
    
    image: trasabilitate-quality-app:${VERSION}
    container_name: quality-app
    restart: unless-stopped
    
    depends_on:
      db:
        condition: service_healthy
    
    environment:
      # Database connection
      DB_HOST: ${DB_HOST}
      DB_PORT: ${DB_PORT}
      DB_NAME: ${DB_NAME}
      DB_USER: ${DB_USER}
      DB_PASSWORD: ${DB_PASSWORD}
      DB_MAX_RETRIES: ${DB_MAX_RETRIES}
      DB_RETRY_INTERVAL: ${DB_RETRY_INTERVAL}
      
      # Flask settings
      FLASK_ENV: ${FLASK_ENV}
      FLASK_APP: run.py
      SECRET_KEY: ${SECRET_KEY}
      
      # Gunicorn settings
      GUNICORN_WORKERS: ${GUNICORN_WORKERS}
      GUNICORN_WORKER_CLASS: ${GUNICORN_WORKER_CLASS}
      GUNICORN_TIMEOUT: ${GUNICORN_TIMEOUT}
      GUNICORN_BIND: ${GUNICORN_BIND}
      GUNICORN_LOG_LEVEL: ${GUNICORN_LOG_LEVEL}
      GUNICORN_PRELOAD_APP: ${GUNICORN_PRELOAD_APP}
      GUNICORN_MAX_REQUESTS: ${GUNICORN_MAX_REQUESTS}
      
      # Initialization flags
      INIT_DB: ${INIT_DB}
      SEED_DB: ${SEED_DB}
      IGNORE_DB_INIT_ERRORS: ${IGNORE_DB_INIT_ERRORS}
      IGNORE_SEED_ERRORS: ${IGNORE_SEED_ERRORS}
      SKIP_HEALTH_CHECK: ${SKIP_HEALTH_CHECK}
      
      # Localization
      TZ: ${TZ}
      LANG: ${LANG}
      
      # Backup path
      BACKUP_PATH: ${BACKUP_PATH}
    
    ports:
      - "${APP_PORT}:8781"
    
    volumes:
      # Application code - mapped for easy updates without rebuilding
      - ${APP_CODE_PATH}:/app
      # Application logs - persistent across container restarts
      - ${LOGS_PATH}:/srv/quality_app/logs
      # Instance configuration files (database config)
      - ${INSTANCE_PATH}:/app/instance
      # Backup storage - shared with database container
      - ${BACKUP_PATH}:/srv/quality_app/backups
      # Host /data folder for direct access (includes /data/backups)
      - /data:/data
    
    networks:
      - quality-app-network
    
    healthcheck:
      test: ["CMD", "curl", "-f", "http://localhost:8781/"]
      interval: 30s
      timeout: 10s
      retries: 3
      start_period: 60s
    
    deploy:
      resources:
        limits:
          cpus: ${APP_CPU_LIMIT}
          memory: ${APP_MEMORY_LIMIT}
        reservations:
          cpus: ${APP_CPU_RESERVATION}
          memory: ${APP_MEMORY_RESERVATION}
    
    logging:
      driver: json-file
      options:
        max-size: ${LOG_MAX_SIZE}
        max-file: ${LOG_MAX_FILES}
        compress: "true"

# ============================================================================
# Network Configuration
# ============================================================================
networks:
  quality-app-network:
    driver: bridge
    ipam:
      config:
        - subnet: ${NETWORK_SUBNET}

# ============================================================================
# USAGE NOTES
# ============================================================================
# VOLUME STRUCTURE:
# ./data/mariadb/     - Database files (MariaDB data directory)
# ./config/instance/  - Application configuration (external_server.conf)
# ./logs/             - Application logs
# ./backups/          - Database backups
# ./py_app/           - (Optional) Application code for development
#
# FIRST TIME SETUP:
# 1. Create directory structure:
#    mkdir -p data/mariadb config/instance logs backups
# 2. Copy .env.example to .env and customize all values
# 3. Set INIT_DB=true and SEED_DB=true in .env for first deployment
# 4. Change default passwords and SECRET_KEY in .env (CRITICAL!)
# 5. Build and start: docker-compose up -d --build
#
# SUBSEQUENT DEPLOYMENTS:
# 1. Set INIT_DB=false and SEED_DB=false in .env
# 2. Start: docker-compose up -d
#
# COMMANDS:
# - Build and start:     docker-compose up -d --build
# - Stop:                docker-compose down
# - Stop & remove data:  docker-compose down -v (WARNING: deletes database!)
# - View logs:           docker-compose logs -f web
# - Database logs:       docker-compose logs -f db
# - Restart:             docker-compose restart
# - Rebuild image:       docker-compose build --no-cache web
#
# BACKUP:
# - Manual backup:       docker-compose exec db mysqldump -u trasabilitate -p trasabilitate > backups/manual_backup.sql
# - Restore:             docker-compose exec -T db mysql -u trasabilitate -p trasabilitate < backups/backup.sql
#
# DATABASE ACCESS:
# - MySQL client:        docker-compose exec db mysql -u trasabilitate -p trasabilitate
# - From host:           mysql -h 127.0.0.1 -P 3306 -u trasabilitate -p
# ============================================================================