---
name: "Build, Test and Publish"

"on":
  # run it on push to the default repository branch
  push:
    branches: [master, develop]
  # run it during pull request
  pull_request:

env:
  IMAGE_NAME: glenux/teaching-boilerplate
  DOCKER_BUILDKIT: 1

jobs:
  build-docker-image:
    name: "Build docker image"
    # run only when code is compiling and tests are passing
    runs-on: ubuntu-latest

    # steps to perform in job
    steps:
      - name: Set current date as env variable
        run: |
          export BUILD_VERSION=v$(date +'%Y%m%d_%H%M')
          echo "BUILD_VERSION=$BUILD_VERSION" >> $GITHUB_ENV

      - name: Checkout code
        uses: actions/checkout@v2

      - name: Build image and save as file
        run: |
          docker build \
            --file docker/Dockerfile \
            --cache-from $IMAGE_NAME:latest \
            --tag $IMAGE_NAME:latest \
            --build-arg BUILDKIT_INLINE_CACHE=1 \
            "."
          docker save $IMAGE_NAME:latest > /tmp/image.tar

      - name: Image digest
        run: echo ${{ steps.docker_build.outputs.digest }}

      - name: Save important variables as extra.env
        run: |
          echo "BUILD_VERSION=$BUILD_VERSION" >> /tmp/extra.env
          cat /tmp/extra.env

      - name: Upload artifacts
        uses: actions/upload-artifact@v2
        with:
          name: artifacts
          path: |
            /tmp/image.tar
            /tmp/extra.env

  test-docker-image:
    name: "Test docker image (build PDF and HTML)"
    needs: build-docker-image
    runs-on: ubuntu-latest

    steps:
      - name: Checkout code
        uses: actions/checkout@v2

      - name: Download artifact
        uses: actions/download-artifact@v2
        with:
          name: artifacts
          path: /tmp

      - name: Load environment
        run: |
          cat /tmp/extra.env >> $GITHUB_ENV

      - name: Load image
        run: |
          docker load --input /tmp/image.tar
          docker image ls -a

      - name: Build HTML for docs
        run: |
          ./scripts/gx-teaching \
            --no-tty \
            --data-dir . \
            --action build-docs-html

      - name: Build PDF for docs
        run: |
          ./scripts/gx-teaching \
            --no-tty  \
            --data-dir . \
            --action build-docs-pdf

      - name: Build HTML for slides
        run: |
          ./scripts/gx-teaching \
            --no-tty  \
            --data-dir . \
            --action build-slides-html

      - name: Build PDF for slides
        run: |
          ./scripts/gx-teaching \
            --no-tty \
            --data-dir . \
            --action build-slides-pdf

  push-docker-image:
    name: "Push docker image to registry"
    needs: test-docker-image
    if: github.ref == 'refs/heads/master'
    runs-on: ubuntu-latest
    steps:
      - name: Download artifact
        uses: actions/download-artifact@v2
        with:
          name: artifacts
          path: /tmp

      - name: Load environment
        run: |
          cat /tmp/extra.env >> $GITHUB_ENV

      - name: Set up Docker Buildx
        id: buildx
        uses: docker/setup-buildx-action@v1

      - name: Load image
        run: |
          docker load --input /tmp/image.tar
          docker image ls -a

      - name: Login to DockerHub
        uses: docker/login-action@v1
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}

      - name: Tag images
        run: |
          docker tag \
            glenux/teaching-boilerplate:latest \
            glenux/teaching-boilerplate:${{ env.BUILD_VERSION }}

      - name: Build image and push to Docker Hub and GitHub Container Registry
        run: |
          docker push glenux/teaching-boilerplate:latest
          docker push glenux/teaching-boilerplate:${{ env.BUILD_VERSION }}
#