name: Build image

on:
  push:
    branches: ["develop", "master"]
    tags: ["v*"]
  workflow_dispatch:

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

jobs:
  build-and-push:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v3

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Log in to GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      # checkmate-backend-mono is a transitional alias so existing deployments
      # keep receiving updates; drop it after one release cycle.
      - name: Docker metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: |
            ghcr.io/${{ github.repository_owner }}/checkmate
            ghcr.io/${{ github.repository_owner }}/checkmate-backend-mono
          flavor: |
            latest=false
          tags: |
            type=ref,event=branch
            type=ref,event=tag
            type=semver,pattern={{version}}
            type=raw,value=latest,enable=${{ startsWith(github.ref, 'refs/tags/v') }}

      - name: Build and push multi-arch image
        uses: docker/build-push-action@v6
        with:
          context: .
          file: ./docker/Dockerfile
          push: true
          platforms: linux/amd64,linux/arm64
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max

  # The hosted staging/prod instances share one host and one compose file; each
  # deploy pulls and recreates only its own service.
  deploy-staging:
    needs: build-and-push
    if: github.ref == 'refs/heads/develop'
    runs-on: ubuntu-latest
    steps:
      - name: Deploy staging.checkmate.so
        uses: appleboy/ssh-action@v1.2.2
        with:
          host: ${{ secrets.DEMO_SERVER_HOST }}
          username: ${{ secrets.DEMO_SERVER_USER }}
          key: ${{ secrets.DEMO_SERVER_SSH_KEY }}
          script: |
            cd checkmate
            git pull
            cd docs/hosting/checkmate-so
            docker compose pull checkmate-staging
            docker compose up -d checkmate-staging
            docker system prune -af

  deploy-prod:
    needs: build-and-push
    if: github.ref == 'refs/heads/master'
    runs-on: ubuntu-latest
    steps:
      - name: Deploy demo.checkmate.so
        uses: appleboy/ssh-action@v1.2.2
        with:
          host: ${{ secrets.DEMO_SERVER_HOST }}
          username: ${{ secrets.DEMO_SERVER_USER }}
          key: ${{ secrets.DEMO_SERVER_SSH_KEY }}
          script: |
            cd checkmate
            git pull
            cd docs/hosting/checkmate-so
            docker compose pull checkmate-demo
            docker compose up -d checkmate-demo
            docker system prune -af