name: Build PR Image
on:
  pull_request:
    types: [opened, synchronize, reopened, closed]

jobs:
  build-application:
    name: Build and Push `Forem`
    runs-on: ubuntu-latest
    if: ${{ github.event_name != 'pull_request' || github.event.action != 'closed' }}
    outputs:
      tags: ${{ steps.meta.outputs.tags }}
    steps:
      - name: Checkout git repo
        uses: actions/checkout@v3
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v2
      - name: Generate UUID image name
        id: uuid
        run: echo "UUID_TAG_APP=forem-$(uuidgen --time)" >> $GITHUB_ENV
      - name: Docker metadata
        id: meta
        uses: docker/metadata-action@v4
        with:
          images: registry.uffizzi.com/${{ env.UUID_TAG_APP }}
          tags: type=raw,value=30d
      - uses: actions/checkout@master
      - name: Create the .env file
        run: |
          cp .env_sample .env
      - name: Build and Push Image to registry.uffizzi.com ephemeral registry
        uses: docker/build-push-action@v2
        with:
          push: true
          context: .
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          file: ./Dockerfile
          target: uffizzi
          cache-from: type=gha
          cache-to: type=gha,mode=min

  render-compose-file:
    name: Render Docker Compose File
    # Pass output of this workflow to another triggered by `workflow_run` event.
    runs-on: ubuntu-latest
    needs:
      - build-application
    outputs:
      compose-file-cache-key: ${{ steps.hash.outputs.hash }}
    steps:
      - name: Checkout git repo
        uses: actions/checkout@v3
      - name: Render Compose File
        run: |
          APP_IMAGE=$(echo ${{ needs.build-application.outputs.tags }})
          export APP_IMAGE
          export UFFIZZI_URL=\$UFFIZZI_URL
          # Render simple template from environment variables.
          envsubst '$APP_IMAGE' < ./uffizzi/docker-compose.uffizzi.yml > docker-compose.rendered.yml
          cat docker-compose.rendered.yml
      - name: Upload Rendered Compose File as Artifact
        uses: actions/upload-artifact@v3
        with:
          name: preview-spec
          path: docker-compose.rendered.yml
          retention-days: 2
      - name: Upload PR Event as Artifact
        uses: actions/upload-artifact@v3
        with:
          name: preview-spec
          path: ${{ github.event_path }}
          retention-days: 2

  delete-preview:
    name: Call for Preview Deletion
    runs-on: ubuntu-latest
    if: ${{ github.event.action == 'closed' }}
    steps:
      # If this PR is closing, we will not render a compose file nor pass it to the next workflow.
      - name: Upload PR Event as Artifact
        uses: actions/upload-artifact@v3
        with:
          name: preview-spec
          path: ${{ github.event_path }}
          retention-days: 2