name: Build and Deploy to Production

on:
  push:
    branches:
      - main

jobs:
  # Same job as in test.yaml (non-main branches); duplicated so a broken
  # build blocks deploy — Forgejo has no cross-workflow needs.
  check:
    runs-on: nix-latest
    steps:
      - name: Prepare container for actions
        run: |
          echo "experimental-features = nix-command flakes" >> /etc/nix/nix.conf
          nix-env -iA nixpkgs.nodejs_22

      - name: Checkout
        uses: actions/checkout@v4

      - name: Build site
        run: nix develop -c zola build

  build:
    runs-on: arch-latest
    needs: check
    container:
      image: gcr.io/kaniko-project/executor:debug
    outputs:
      image_tag: ${{ steps.build_image.outputs.image_tag }}
    steps:
      - name: Build and push Docker Image using Kaniko
        id: build_image
        run: |
          # Tags
          SHORT_SHA=${GITHUB_SHA::8}
          IMAGE_BASE=${{ secrets.FORGEJO_REGISTRY }}/${{ secrets.FORGEJO_USER }}/blog
          IMAGE_TAG=${IMAGE_BASE}:${SHORT_SHA}
          IMAGE_LATEST=${IMAGE_BASE}:latest

          # Auth Conf
          mkdir -p /kaniko/.docker
          echo "{\"auths\":{\"${{ secrets.FORGEJO_REGISTRY }}\":{\"auth\":\"$(echo -n ${{ secrets.FORGEJO_USER }}:${{ secrets.FORGEJO_TOKEN }} | base64)\"}}}" > /kaniko/.docker/config.json

          # Build & push
          /kaniko/executor \
            --context=git://${{ secrets.FORGEJO_REGISTRY }}/${{ github.repository }}.git \
            --git=branch=${{ github.ref_name }} \
            --destination=$IMAGE_TAG \
            --destination=$IMAGE_LATEST

          # Output the specific tag for deployment
          echo "image_tag=${IMAGE_TAG}" >> $GITHUB_OUTPUT

  deploy:
    runs-on: arch-latest
    needs: build
    steps:
      - name: Install dependencies
        run: |
          pacman -Syu --noconfirm nodejs openssh rsync

      - name: Checkout code
        uses: actions/checkout@v4

      - name: Deploy docker-compose.yml
        uses: easingthemes/ssh-deploy@v5.1.0
        with:
          SSH_PRIVATE_KEY: ${{ secrets.DEPLOY_SSH_KEY }}
          REMOTE_HOST: ${{ secrets.DEPLOY_IP }}
          REMOTE_USER: ${{ secrets.DEPLOY_USER }}
          SOURCE: "docker-compose.yml"
          TARGET: "/opt/blog/"

      - name: Deploy and update container
        uses: appleboy/ssh-action@v1.2.3
        env:
          NEW_IMAGE: ${{ needs.build.outputs.image_tag }}
        with:
          host: ${{ secrets.DEPLOY_IP }}
          username: ${{ secrets.DEPLOY_USER }}
          key: ${{ secrets.DEPLOY_SSH_KEY }}
          envs: NEW_IMAGE
          script: |
            cd /opt/blog

            sed -i "s|image:.*|image: $NEW_IMAGE|" docker-compose.yml

            docker pull $NEW_IMAGE
            docker compose up -d

            # Wait for the image HEALTHCHECK to report healthy.
            for i in $(seq 1 18); do
              status=$(docker inspect --format '{{.State.Health.Status}}' blog 2>/dev/null || echo missing)
              if [ "$status" = "healthy" ]; then
                echo "Deployment successful!"
                exit 0
              fi
              sleep 5
            done
            echo "blog never became healthy (last status: $status)" >&2
            docker logs --tail 50 blog
            exit 1