# ═══════════════════════════════════════════════════════════════════
# docker-compose.yml — n8n + FFmpeg for 1 CPU / 2 GB RAM
# Use this for local testing. On CloudStation/Railway, use only
# the Dockerfile and set environment variables via their dashboard.
# ═══════════════════════════════════════════════════════════════════

version: '3.8'

services:
  n8n:
    build:
      context: .
      dockerfile: Dockerfile
    restart: unless-stopped
    ports:
      - "5678:5678"

    # ── Resource limits ─────────────────────────────────────────
    # Hard cap: prevents Docker from letting this container OOM the host
    # memory: 1800m leaves 200MB for OS when running on 2GB host
    # cpus: 1.0 = use at most 1 full CPU core (matches CloudStation tier)
    deploy:
      resources:
        limits:
          memory: 1800m
          cpus: '1.0'
        reservations:
          memory: 256m

    # ── Volume mounts ───────────────────────────────────────────
    volumes:
      # Persistent n8n data: workflows, credentials, execution history
      - n8n_data:/home/node/.n8n
      # Persistent /tmp for workflow intermediates
      # Without this, /tmp resets on container restart mid-workflow
      - sfcm_tmp:/tmp/sfcm

    # ── Environment variables ───────────────────────────────────
    # These supplement the ENV vars in the Dockerfile
    environment:
      # REQUIRED: Set your own encryption key — do not use this default
      # Generate with: openssl rand -hex 32
      - N8N_ENCRYPTION_KEY=${N8N_ENCRYPTION_KEY:-change-this-to-a-random-32-char-string}

      # Webhook URL — set to your CloudStation/Railway public URL
      # Example: https://your-app.up.railway.app
      - WEBHOOK_URL=${WEBHOOK_URL:-http://localhost:5678}
      - N8N_HOST=${N8N_HOST:-localhost}
      - N8N_PORT=5678
      - N8N_PROTOCOL=${N8N_PROTOCOL:-http}

      # Optional: basic auth to protect your n8n instance
      # - N8N_BASIC_AUTH_ACTIVE=true
      # - N8N_BASIC_AUTH_USER=admin
      # - N8N_BASIC_AUTH_PASSWORD=your-secure-password

      # Timezone — important for cron triggers (your 10-min poll)
      - GENERIC_TIMEZONE=${TIMEZONE:-Asia/Karachi}
      - TZ=${TIMEZONE:-Asia/Karachi}

      # Node heap limit — repeated here to ensure it's set
      # even if Dockerfile ENV is overridden
      - NODE_OPTIONS=--max-old-space-size=512

    # ── Tmpfs for ephemeral script files ────────────────────────
    # The .sh scripts we write and execute are tiny (<100KB).
    # Keeping them in memory avoids disk I/O for script creation.
    # Size: 100m is more than enough for our scripts
    tmpfs:
      - /tmp/scripts:size=100m,mode=1777

volumes:
  n8n_data:
    driver: local
  sfcm_tmp:
    driver: local