# SAAC Application Stack
# See SAAC_DEPLOYMENT.md for full deployment rules and common mistakes.
#
# Key rules:
#   1. Use "expose", NEVER "ports" — Traefik handles routing
#   2. Database host = service name ("postgres"), NEVER "localhost"
#   3. Do NOT change POSTGRES_DB after first deploy — Docker volume keeps the old name
#   4. Do NOT add Traefik labels — SAAC uses file provider, labels are ignored
#   5. Keep it simple — get this working first, then iterate

services:
  app:
    build:
      context: .
      args:
        SOURCE_COMMIT: ${SOURCE_COMMIT:-unknown}
        APP_VERSION: ${APP_VERSION:-1.0.0}
    restart: unless-stopped
    environment:
      - NODE_ENV=production
      - PORT=3000
      # Database host MUST be the service name ("postgres"), not "localhost".
      # In Docker, localhost = inside this container. "postgres" resolves to
      # the postgres service below via Docker DNS.
      - POSTGRES_HOST=postgres
      - POSTGRES_PORT=5432
      - POSTGRES_USER=postgres
      - POSTGRES_PASSWORD=postgres
      # WARNING: Do NOT change POSTGRES_DB after first deploy!
      # The Docker volume persists the original database name.
      # If you change this, the new database won't exist and your app will crash.
      - POSTGRES_DB=postgres
      - REDIS_HOST=redis
      - REDIS_PORT=6379
      - APP_VERSION=${APP_VERSION:-1.0.0}
    depends_on:
      postgres:
        condition: service_healthy
      redis:
        condition: service_healthy
    # Use "expose" to make the port available to Traefik on the Docker network.
    # NEVER use "ports" (e.g. "3000:3000") — it binds to the host and conflicts
    # with other apps. Traefik handles all external routing automatically.
    expose:
      - "3000"
    healthcheck:
      test: ["CMD", "curl", "-f", "http://localhost:3000/health"]
      interval: 10s
      timeout: 3s
      start_period: 5s
      retries: 2

  postgres:
    image: postgres:16-alpine
    restart: unless-stopped
    environment:
      - POSTGRES_USER=postgres
      - POSTGRES_PASSWORD=postgres
      # This creates the database on first start. Must match POSTGRES_DB above.
      - POSTGRES_DB=postgres
    volumes:
      - postgres-data:/var/lib/postgresql/data
    expose:
      - "5432"
    healthcheck:
      test: ["CMD-SHELL", "pg_isready -U postgres"]
      interval: 5s
      timeout: 3s
      retries: 3

  redis:
    image: redis:7-alpine
    restart: unless-stopped
    command: redis-server --appendonly yes
    volumes:
      - redis-data:/data
    expose:
      - "6379"
    healthcheck:
      test: ["CMD", "redis-cli", "ping"]
      interval: 5s
      timeout: 3s
      retries: 3

volumes:
  postgres-data:
    driver: local
  redis-data:
    driver: local