name: Docker image CI/CD

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

env:
  DOCKER_IMAGE_NAME: jlesage/firefox
  PLATFORMS: linux/amd64,linux/386,linux/arm/v7,linux/arm64/v8

on:
  push:
    branches: '*'
    tags:
      - v[0-9][0-9].[0-9][0-9].[0-9]+
      - v[0-9][0-9].[0-9][0-9].[0-9]+-pre.[0-9]+
  pull_request:

jobs:
  build:
    name: Build image
    runs-on: ubuntu-20.04

    steps:
      - name: Free disk space
        uses: jlumbroso/free-disk-space@main
        with:
          tool-cache: true
          android: true
          dotnet: true
          haskell: true
          large-packages: true
          docker-images: true
          swap-storage: false

      - name: Prepare
        id: prep
        run: |
          # Determine the Docker container version.
          VERSION=unknown
          if [[ $GITHUB_REF =~ refs/tags/* ]]; then
            # Git tag pushed: use tag as the version.
            VERSION=${GITHUB_REF#refs/tags/}
          elif [[ $GITHUB_REF =~ refs/heads/* ]]; then
            # Git commit pushed: use the commit SHA as the version.
            VERSION=${GITHUB_SHA::8}
          elif [[ $GITHUB_REF =~ refs/pull/* ]]; then
            # Pull request: use PR number as the version.
            VERSION=pr-${{ github.event.number }}
          else
            echo "::error::Unexpected GITHUB_REF: $GITHUB_REF"
            exit 1
          fi
          # Determine the version to put in container label.
          LABEL_VERSION=${VERSION}
          if [[ $GITHUB_REF =~ refs/tags/* ]]; then
            # Do not include the starting 'v' of the version.
            LABEL_VERSION=${VERSION:1}
          fi
          # Determine the Docker container tags.
          TAGS="${{ env.DOCKER_IMAGE_NAME }}:${VERSION}"
          if [[ $GITHUB_REF =~ refs/tags/* ]]; then
            TAGS="$TAGS,${{ env.DOCKER_IMAGE_NAME }}:latest"
          fi
          # Determine the release type.
          if [[ $GITHUB_REF =~ refs/tags/* ]]; then
              IS_RELEASE=yes
              if [[ $GITHUB_REF =~ -pre\.[0-9]+ ]]; then
                  RELEASE_TYPE="pre"
              else
                  RELEASE_TYPE="standard"
              fi
          else
              IS_RELEASE=no
              RELEASE_TYPE="n/a"
          fi
          # Print results.
          echo "::group::Results"
          echo "Github reference: $GITHUB_REF"
          echo "Release: $IS_RELEASE"
          echo "Release type: $RELEASE_TYPE"
          echo "Docker container version: $VERSION"
          echo "Docker container version label: $LABEL_VERSION"
          echo "Docker container tag(s): $TAGS"
          echo "::endgroup::"
          # Export outputs.
          echo "is_release=${IS_RELEASE}" >> $GITHUB_OUTPUT
          echo "release_type=${RELEASE_TYPE}" >> $GITHUB_OUTPUT
          echo "version=${VERSION}" >> $GITHUB_OUTPUT
          echo "label_version=${LABEL_VERSION}" >> $GITHUB_OUTPUT
          echo "tags=${TAGS}" >> $GITHUB_OUTPUT
          #echo "build_date=$(date -u +'%Y-%m-%dT%H:%M:%SZ')" >> $GITHUB_OUTPUT

      - name: Setup QEMU
        uses: docker/setup-qemu-action@v3
        with:
          platforms: arm,arm64,ppc64le,mips64,s390x

      - name: Setup Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Login to DockerHub
        if: ${{ steps.prep.outputs.is_release == 'yes' }}
        uses: docker/login-action@v3
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_PASSWORD }}

      - name: Build and push
        uses: docker/build-push-action@v6
        with:
          push: ${{ steps.prep.outputs.is_release == 'yes' }}
          provenance: false
          platforms: ${{ env.PLATFORMS }}
          tags: ${{ steps.prep.outputs.tags }}
          build-args: |
            DOCKER_IMAGE_VERSION=${{ steps.prep.outputs.label_version }}
          cache-from: type=gha,scope=${{ env.DOCKER_IMAGE_NAME }}
          cache-to: type=gha,mode=max,scope=${{ env.DOCKER_IMAGE_NAME }}

      - name: Inspect
        if: ${{ steps.prep.outputs.is_release == 'yes' }}
        run: |
          docker buildx imagetools inspect ${{ env.DOCKER_IMAGE_NAME }}:${{ steps.prep.outputs.version }}

      - name: Checkout
        uses: actions/checkout@v4
        if: ${{ steps.prep.outputs.release_type == 'standard' }}

      - name: Dockerhub description
        if: ${{ steps.prep.outputs.release_type == 'standard' }}
        uses: peter-evans/dockerhub-description@v4
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_PASSWORD }}
          repository: ${{ env.DOCKER_IMAGE_NAME }}
          readme-filepath: DOCKERHUB.md

  notification:
    name: Notification
    needs: [ build ]
    runs-on: ubuntu-20.04
    if: ${{ always() && github.event_name != 'pull_request' }}

    steps:
      - name: Pushover notification
        uses: desiderati/github-action-pushover@v1
        with:
          job-status: ${{ needs.build.result }}
          pushover-api-token: ${{ secrets.PUSHOVER_API_TOKEN }}
          pushover-user-key: ${{ secrets.PUSHOVER_USER_KEY }}