# Brings up the full stack with one command: the Go API, MySQL, and Redis.
#
# Usage:
#   cp .env.example .env      # fill in real values, especially Google OAuth
#   docker compose up --build
#
# docker compose automatically loads a file literally named ".env" sitting
# next to this file, and substitutes ${VAR} references below from it.

services:
  app:
    build: .
    ports:
      - "8070:8080"
    depends_on:
      - mysql
      - redis
    environment:
      PORT: 8080
      ENV: development

      # NOTE: these hostnames are NOT "127.0.0.1" - inside the compose
      # network, each service's NAME becomes its hostname. Compose runs an
      # internal DNS that resolves "mysql" and "redis" to the correct
      # container's IP address automatically. This is exactly why
      # internal/config reads these from environment variables instead of
      # hardcoding 127.0.0.1 - the same compiled binary works unchanged
      # both locally and inside Docker, just by changing env vars.
      DB_HOST: mysql
      DB_PORT: 3306
      DB_USER: root
      DB_PASSWORD: devpass
      DB_NAME: go_simple_api

      REDIS_ADDR: redis:6379

      GOOGLE_CLIENT_ID: ${GOOGLE_CLIENT_ID}
      GOOGLE_CLIENT_SECRET: ${GOOGLE_CLIENT_SECRET}
      GOOGLE_REDIRECT_URL: http://localhost:8080/auth/google/callback

      ALLOWED_ORIGINS: http://localhost:3000

  mysql:
    image: mysql:9
    environment:
      MYSQL_ROOT_PASSWORD: devpass
      MYSQL_DATABASE: go_simple_api
    ports:
      - "13306:3306"
    volumes:
      # Named volume: MySQL's data directory is persisted on the host,
      # independent of the container's lifecycle. Without this, all data
      # would be lost every time you run `docker compose down`.
      - mysql_data:/var/lib/mysql

  redis:
    image: redis:8
    ports:
      - "16379:6379"

volumes:
  mysql_data: