name: Publish Docker Image
on: 
  push:
    branches: [ master ]
    tags:
      - '**'

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

env:
  REGISTRY_IMAGE: tindy2013/subconverter

jobs:
  build:
    strategy:
      matrix:
        include:
          - platform: linux/amd64
            os: ubuntu-latest
          - platform: linux/386
            os: ubuntu-latest
          - platform: linux/arm/v7
            os: [self-hosted, linux, ARM]
          - platform: linux/arm64
            os: [self-hosted, linux, ARM64]
    runs-on: ${{ matrix.os }}
    name: Build ${{ matrix.platform }} Image
    steps:
      - name: Prepare
        run: |
          platform=${{ matrix.platform }}
          echo "PLATFORM_PAIR=${platform//\//-}" >> $GITHUB_ENV    

      - name: Checkout base
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

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

      - name: Docker meta
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY_IMAGE }}
          tags: |
            type=semver,pattern={{version}}
            type=raw,value=latest,enable={{is_default_branch}}

      - name: Docker login
        uses: docker/login-action@v3
        with:
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_PASSWORD }}

      - name: Get commit SHA
        if: github.ref == 'refs/heads/master'
        id: vars
        run: echo "sha_short=$(git rev-parse --short HEAD)" >> $GITHUB_OUTPUT

      - name: Build and export
        id: build
        uses: docker/build-push-action@v5
        with:
          platforms: ${{ matrix.platform }}
          context: scripts/
          labels: ${{ steps.meta.outputs.labels }}
          build-args: |
            SHA=${{ steps.vars.outputs.sha_short }}
          outputs: type=image,name=${{ env.REGISTRY_IMAGE }},push-by-digest=true,name-canonical=true,push=true

      - name: Export digest
        run: |
          rm -rf /tmp/digests
          mkdir -p /tmp/digests
          digest="${{ steps.build.outputs.digest }}"
          touch "/tmp/digests/${digest#sha256:}"

      - name: Upload artifact
        uses: actions/upload-artifact@v4
        with:
          name: digest-${{ env.PLATFORM_PAIR }}
          path: /tmp/digests/*
          if-no-files-found: error
          retention-days: 1

  merge:
    name: Merge
    needs: build
    runs-on: ubuntu-latest
    steps:
      - name: Download digests
        uses: actions/download-artifact@v4
        with:
          path: /tmp/digests
          pattern: digest-*
          merge-multiple: true

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

      - name: Docker meta
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY_IMAGE }}
          tags: |
            type=semver,pattern={{version}}
            type=raw,value=latest,enable={{is_default_branch}}

      - name: Docker login
        uses: docker/login-action@v3
        with:
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_PASSWORD }}

      - name: Create manifest list and push
        working-directory: /tmp/digests
        run: |
          docker buildx imagetools create $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
            $(printf '${{ env.REGISTRY_IMAGE }}@sha256:%s ' *)      

      - name: Inspect image
        run: |
          docker buildx imagetools inspect ${{ env.REGISTRY_IMAGE }}:${{ steps.meta.outputs.version }}