name: Containers

env:
  zephyr-version: 2.4.0
  zephyr-sdk-version: 0.11.4
  cache-repository-name: zmk-docker-cache

on:
  push:
  pull_request:
  workflow_dispatch:

concurrency: ${{ github.workflow }}
    
jobs:
  namespaces:
    runs-on: ubuntu-latest
    outputs:
      docker-hub: ${{ secrets.DOCKER_HUB_NAMESPACE || github.repository_owner }}
      ghcr: ${{ github.repository_owner }}
    steps:
      - run: true
  credentials:
    runs-on: ubuntu-latest
    outputs:
      ghcr: ${{ steps.ghcr.outcome == 'success' }}
      docker-hub: ${{ steps.docker-hub.outcome == 'success' }}
    steps:
      - name: Docker Hub
        id: docker-hub
        run: if [ ${{ secrets.DOCKER_HUB_USERNAME == null || secrets.DOCKER_HUB_TOKEN == null }} = true ]; then exit 1; fi
        continue-on-error: true
      - name: GitHub Container Registry
        id: ghcr
        run: if [ ${{ secrets.GHCR_USERNAME == null || secrets.GHCR_TOKEN == null }} = true ]; then exit 1; fi
        continue-on-error: true
  architectures:
    runs-on: ubuntu-latest
    outputs:
      json: ${{ steps.import.outputs.json }}
    steps:
      - name: Checkout
        uses: actions/checkout@v2
      - name: Import from architectures.yml
        id: import
        shell: python
        run: |
          import yaml, json
          with open('architectures.yml', 'r') as file:
            architectures = yaml.safe_load(file)
            print('::set-output name=json::' + json.dumps(architectures))
  tags:
    runs-on: ubuntu-latest
    outputs:
      candidate: ${{ steps.definitions.outputs.candidate }}
      versions: ${{ steps.definitions.outputs.versions }}
      major-minor: ${{ steps.definitions.outputs.major-minor }}
      latest: ${{ steps.definitions.outputs.latest }}
      release-trigger: ${{ steps.definitions.outputs.release-trigger }}
    steps:
      - name: Definitions
        id: definitions
        env:
          SHA: ${{ github.sha }}
          ZEPHYR_VERSION: ${{ env.zephyr-version }}
          ZEPHYR_SDK_VERSION: ${{ env.zephyr-sdk-version }}
        run: |
          CANDIDATE=${SHA}
          VERSIONS=${ZEPHYR_VERSION}-${ZEPHYR_SDK_VERSION}
          MAJOR=$(echo ${ZEPHYR_VERSION} | cut -d'.' -f 1)
          MINOR=$(echo ${ZEPHYR_VERSION} | cut -d'.' -f 2)
          MAJOR_MINOR=${MAJOR}.${MINOR}
          LATEST=${MAJOR_MINOR}
          RELEASE_TRIGGER=${ZEPHYR_VERSION}-${ZEPHYR_SDK_VERSION}

          echo ::set-output name=candidate::${CANDIDATE}
          echo ::set-output name=versions::${VERSIONS}
          echo ::set-output name=major-minor::${MAJOR_MINOR}
          echo ::set-output name=latest::${LATEST}
          echo ::set-output name=release-trigger::${RELEASE_TRIGGER}
  docker:
    needs:
      - namespaces
      - credentials
      - architectures
      - tags
    runs-on: ubuntu-latest
    strategy:
      max-parallel: 1 # takes advantage of caching between jobs
      matrix: 
        architecture: ${{ fromJSON(needs.architectures.outputs.json) }}
        target: # ordered from biggest to smallest to take advantage of the registry cache
          - dev
          - build
    steps:
      - name: Login to Docker Hub
        id: docker-hub-login
        if: ${{ needs.credentials.outputs.docker-hub == 'true' }}
        uses: docker/login-action@v1
        with:
          username: ${{ secrets.DOCKER_HUB_USERNAME }}
          password: ${{ secrets.DOCKER_HUB_TOKEN }}
      - name: Login to GitHub Container Registry
        id: ghcr-login
        if: ${{ needs.credentials.outputs.ghcr == 'true' }}
        uses: docker/login-action@v1
        with:
          registry: ghcr.io
          username: ${{ secrets.GHCR_USERNAME }}
          password: ${{ secrets.GHCR_TOKEN }}
      - name: Prepare variables
        id: vars
        run: |
          REPOSITORY_NAME=zmk-${{ matrix.target }}-${{ matrix.architecture }}
          echo ::set-output name=repository-name::${REPOSITORY_NAME}
      - name: Set up QEMU
        if: ${{ !startsWith(github.ref, 'refs/tags') }}
        uses: docker/setup-qemu-action@v1
      - name: Set up Docker Buildx
        if: ${{ !startsWith(github.ref, 'refs/tags') }}
        uses: docker/setup-buildx-action@v1
      - name: Build and push (candidate)
        id: build-push
        if: ${{ !startsWith(github.ref, 'refs/tags') }}
        uses: docker/build-push-action@v2
        with:
          target: ${{ matrix.target }}
          build-args: |
            ZEPHYR_VERSION=${{ env.zephyr-version }}
            ARCHITECTURE=${{ matrix.architecture }}
            ZEPHYR_SDK_VERSION=${{ env.zephyr-sdk-version }}
          labels: |
            org.opencontainers.image.source=${{ github.server_url }}/${{ github.repository }}
            org.opencontainers.image.revision=${{ github.sha }}
          tags: |
            docker.io/${{ needs.namespaces.outputs.docker-hub }}/${{ steps.vars.outputs.repository-name }}:${{ needs.tags.outputs.candidate }}
          cache-from: type=registry,ref=docker.io/${{ needs.namespaces.outputs.docker-hub }}/${{ env.cache-repository-name }}:dev
          cache-to: ${{ (steps.docker-hub-login.outcome == 'success') && (matrix.target == 'dev') && format('type=registry,ref=docker.io/{0}/{1}:{2},mode=max', needs.namespaces.outputs.docker-hub, env.cache-repository-name, 'dev') || null }}
          push: ${{ steps.docker-hub-login.outcome == 'success' }}
      - name: Release (pull candidate, tag, push)
        if: ${{ github.ref == format('refs/tags/{0}', needs.tags.outputs.release-trigger) }}
        run: |
          if [ "${{ steps.docker-hub-login.outcome }}" != "success" ]; then
            echo "Docker Hub must be authenticated to perform a release!"
            exit 1
          fi
          if [ "${{ steps.ghcr-login.outcome }}" != "success" ]; then
            echo "GitHub Container Registry must be authenticated to perform a release!"
            exit 1
          fi
          docker pull docker.io/${{ needs.namespaces.outputs.docker-hub }}/${{ steps.vars.outputs.repository-name }}:${{ needs.tags.outputs.candidate }}
          docker tag docker.io/${{ needs.namespaces.outputs.docker-hub }}/${{ steps.vars.outputs.repository-name }}:${{ needs.tags.outputs.candidate }} docker.io/${{ needs.namespaces.outputs.docker-hub }}/${{ steps.vars.outputs.repository-name }}:${{ needs.tags.outputs.versions }}
          docker tag docker.io/${{ needs.namespaces.outputs.docker-hub }}/${{ steps.vars.outputs.repository-name }}:${{ needs.tags.outputs.candidate }} docker.io/${{ needs.namespaces.outputs.docker-hub }}/${{ steps.vars.outputs.repository-name }}:${{ needs.tags.outputs.latest }}
          docker tag docker.io/${{ needs.namespaces.outputs.docker-hub }}/${{ steps.vars.outputs.repository-name }}:${{ needs.tags.outputs.candidate }} ghcr.io/${{ needs.namespaces.outputs.ghcr }}/${{ steps.vars.outputs.repository-name }}:${{ needs.tags.outputs.candidate }}
          docker tag docker.io/${{ needs.namespaces.outputs.docker-hub }}/${{ steps.vars.outputs.repository-name }}:${{ needs.tags.outputs.candidate }} ghcr.io/${{ needs.namespaces.outputs.ghcr }}/${{ steps.vars.outputs.repository-name }}:${{ needs.tags.outputs.versions }}
          docker tag docker.io/${{ needs.namespaces.outputs.docker-hub }}/${{ steps.vars.outputs.repository-name }}:${{ needs.tags.outputs.candidate }} ghcr.io/${{ needs.namespaces.outputs.ghcr }}/${{ steps.vars.outputs.repository-name }}:${{ needs.tags.outputs.latest }}
          docker push docker.io/${{ needs.namespaces.outputs.docker-hub }}/${{ steps.vars.outputs.repository-name }}:${{ needs.tags.outputs.candidate }}
          docker push docker.io/${{ needs.namespaces.outputs.docker-hub }}/${{ steps.vars.outputs.repository-name }}:${{ needs.tags.outputs.versions }}
          docker push docker.io/${{ needs.namespaces.outputs.docker-hub }}/${{ steps.vars.outputs.repository-name }}:${{ needs.tags.outputs.latest }}
          docker push ghcr.io/${{ needs.namespaces.outputs.ghcr }}/${{ steps.vars.outputs.repository-name }}:${{ needs.tags.outputs.candidate }}
          docker push ghcr.io/${{ needs.namespaces.outputs.ghcr }}/${{ steps.vars.outputs.repository-name }}:${{ needs.tags.outputs.versions }}
          docker push ghcr.io/${{ needs.namespaces.outputs.ghcr }}/${{ steps.vars.outputs.repository-name }}:${{ needs.tags.outputs.latest }}
  git-tag:
    needs:
    - tags
    - docker
    if: ${{ startsWith(github.ref, 'refs/tags') }}
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v2
        if: ${{ github.ref == format('refs/tags/{0}', needs.tags.outputs.release-trigger) }}
      - name: Tag
        if: ${{ github.ref == format('refs/tags/{0}', needs.tags.outputs.release-trigger) }}
        env:
          TAG: ${{ needs.tags.outputs.major-minor }}
        run: |
          git tag ${TAG}
          git push -f origin ${TAG}