name: Containerize

on:
  push:
    branches: [main]
  pull_request:
    branches: [main]

env:
  REGISTRY: ghcr.io
  GHCR_NAMESPACE: matrix-org/matrix-viewer
  IMAGE_NAME: matrix-viewer

jobs:
  # Create and publish a Docker image for matrix-viewer
  #
  # Based off of
  # https://docs.github.com/en/actions/publishing-packages/publishing-docker-images#publishing-images-to-github-packages
  build-image:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write

    outputs:
      # Make the Docker image name available to use in other jobs as `${{
      # needs.build-image.outputs.docker_image_name }}`. Also see
      # the `save_var` step below for how this works.
      docker_image_name: ${{ steps.save_var.outputs.docker_image_name }}

    steps:
      - name: Checkout repository
        uses: actions/checkout@v3

      - name: Log in to the GitHub Container registry
        uses: docker/login-action@f054a8b539a109f9f41c372932f1ae047eff08c9
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      # Trick to get env variables available in `needs` context which is
      # available to use in almost everywhere
      # (https://docs.github.com/en/actions/learn-github-actions/contexts). This
      # is so that we can reference the same Docker image name in the `services` of
      # the next job.
      #
      # via https://github.community/t/how-to-use-env-with-container-image/17252/25
      - name: Save the Docker image name to a variable so we can share and re-use it in other jobs via `${{ needs.build-image.outputs.docker_image_name }}`
        id: save_var
        run: echo "::set-output name=docker_image_name::${{ env.REGISTRY }}/${{ env.GHCR_NAMESPACE }}/${{ env.IMAGE_NAME }}"

      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@98669ae865ea3cffbcbaa878cf57c20bbf1c6c38
        with:
          images: ${{ steps.save_var.outputs.docker_image_name }}
          # Defaults (as indicated by https://github.com/docker/metadata-action/tree/97c170d70b5f8bfc77e6b23e68381f217cb64ded#tags-input).
          # Plus custom tags:
          #  - Full length sha
          tags: |
            type=schedule
            type=ref,event=branch
            type=ref,event=tag
            type=ref,event=pr
            type=sha,format=long

      - name: Build and push Docker image
        uses: docker/build-push-action@ad44023a93711e3deb337508980b4b5e9bcdc5dc
        with:
          push: true
          context: '.'
          file: 'Dockerfile'
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          build-args: |
            GITHUB_SHA=${{ github.sha }}
            GITHUB_REF=${{ github.ref_name }}

  # Just make sure the container can start-up and responds to the health check
  test-image:
    needs: [build-image]
    runs-on: ubuntu-latest

    services:
      matrix-viewer:
        image: ${{ needs.build-image.outputs.docker_image_name }}:sha-${{ github.sha }}
        credentials:
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
        ports:
          - 3050:3050
        env:
          matrixServerUrl: http://FAKE_SERVER/
          matrixAccessToken: FAKE_TOKEN

    steps:
      - name: See if the container will respond to a request
        run: curl http://localhost:3050/health-check