  #
name: Build Docker Image and Deploy

# Configures this workflow to run every time a change is pushed to main.
on:
  push:
    branches: ["main"]

# Defines two custom environment variables for the workflow. These are used for the Container registry domain, and a name for the Docker image that this workflow builds.
env:
  IMAGE_NAME: ${{ github.repository }}

jobs:
  build-and-push-image:
    name: Build Image and push to Registry
    runs-on: ubuntu-latest
    # Sets the permissions granted to the GITHUB_TOKEN for the actions in this job.
    permissions:
      contents: read
      packages: write
      #
    steps:
      
      - name: Checkout repository
        uses: actions/checkout@v4
      
      # Uses the docker/login-action action to log in to the Container registry registry using the account and password that will publish the packages. Once published, the packages are scoped to the account defined here.
      - name: Log in to the Container registry
        uses: docker/login-action@v3
        with:
          registry: ${{ vars.REGISTRY }}
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_PASSWORD }}
      
      # This step uses [docker/metadata-action](https://github.com/docker/metadata-action#about) to extract tags and labels that will be applied to the specified image. The id "meta" allows the output of this step to be referenced in a subsequent step. The images value provides the base name for the tags and labels.
      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ vars.REGISTRY }}/${{ env.IMAGE_NAME }}
      
      # This step uses the docker/build-push-action action to build the image, based on your repository's Dockerfile. If the build succeeds, it pushes the image to GitHub Packages.
      # It uses the context parameter to define the build's context as the set of files located in the specified path. For more information, see "[Usage](https://github.com/docker/build-push-action#usage)" in the README of the docker/build-push-action repository.
      # It uses the tags and labels parameters to tag and label the image with the output from the "meta" step.
      - name: Build and push Docker image
        uses: docker/build-push-action@v5
        with:
          context: .
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}

  deploy:
    name: Deploy on webserver
    runs-on: ubuntu-latest
    needs: build-and-push-image
    steps:

      - name: Install SSH key for target server
        uses: webfactory/ssh-agent@v0.9.0
        with:
          ssh-private-key: ${{ secrets.SSH_PRIV_KEY }}

      - name: Login to registry
        run: ssh ${{ vars.TARGET_USER }}@${{ vars.TARGET }} -o StrictHostKeyChecking=no "docker login -u ${{ secrets.DOCKER_USERNAME }} -p ${{ secrets.DOCKER_PASSWORD }} ${{ vars.REGISTRY }}"
      - name: Docker Compose the image
        run: ssh ${{ vars.TARGET_USER }}@${{ vars.TARGET }} -o StrictHostKeyChecking=no "docker compose up -d"
      - name: Logout from registry
        run: ssh ${{ vars.TARGET_USER }}@${{ vars.TARGET }} -o StrictHostKeyChecking=no "docker logout ${{ vars.REGISTRY }}"
      - name: Clean old images
        run: ssh ${{ vars.TARGET_USER }}@${{ vars.TARGET }} -o StrictHostKeyChecking=no "docker image prune -a"
