---
name: Build Docker images
on:
  pull_request:
    branches:
      - main
  push:
    branches:
      - main
    tags:
      - v*.*.*
  workflow_dispatch:
    inputs: {}
jobs:
  prepare:
    runs-on: ubuntu-latest
    outputs:
      # Push only if it's a tag or if we're committing in the main branch
      push: ${{toJson(startsWith(github.ref, 'refs/tags/') || (github.ref == 'refs/heads/main' && github.event_name != 'pull_request'))}}
      variants: ${{ steps.matrix.outputs.variants }}
      platforms: ${{ steps.matrix.outputs.platforms }}
      metadata: ${{ steps.matrix.outputs.metadata }}
    steps:
      -
        uses: actions/checkout@v4
      -
        name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v2
        with:
          version: latest
      -
        name: Create variants matrix
        id: matrix
        run: |
          METADATA="$(docker buildx bake --print | jq -c)"
          {
            echo metadata="$METADATA"
            echo variants="$(jq -c '.group.default.targets|map(sub("runner-|builder-"; ""))|unique' <<< "$METADATA")"
            echo platforms="$(jq -c 'first(.target[]) | .platforms' <<< "$METADATA")"
          } >> "$GITHUB_OUTPUT"
        env:
          LATEST: '1' # TODO: unset this variable when releasing the first stable version
          SHA: ${{github.sha}}
          VERSION: ${{github.ref_type == 'tag' && github.ref_name || github.sha}}
  build:
    runs-on: ubuntu-latest
    needs:
      - prepare
    strategy:
      fail-fast: false
      matrix:
        variant: ${{ fromJson(needs.prepare.outputs.variants) }}
        platform: ${{ fromJson(needs.prepare.outputs.platforms) }}
        include:
          - race: ""
            qemu: true
          - platform: linux/amd64
            qemu: false
            race: "-race" # The Go race detector is only supported on amd64
          - platform: linux/386
            qemu: false
    steps:
      -
        uses: actions/checkout@v4
      -
        name: Set up QEMU
        if: matrix.qemu
        uses: docker/setup-qemu-action@v2
        with:
          platforms: ${{matrix.platform}}
      -
        name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v2
        with:
          platforms: ${{matrix.platform}}
          version: latest
      -
        name: Login to DockerHub
        if: fromJson(needs.prepare.outputs.push)
        uses: docker/login-action@v2
        with:
          username: ${{secrets.REGISTRY_USERNAME}}
          password: ${{secrets.REGISTRY_PASSWORD}}
      -
        name: Build
        id: build
        uses: docker/bake-action@v3
        with:
          pull: true
          load: ${{!fromJson(needs.prepare.outputs.push)}}
          targets: |
            builder-${{matrix.variant}}
            runner-${{matrix.variant}}
          # Remove tags to prevent "can't push tagged ref [...] by digest" error
          set: |
            *.tags=
            *.platform=${{matrix.platform}}
            *.cache-from=type=gha,scope=${{github.ref}}-${{matrix.platform}}
            *.cache-from=type=gha,scope=refs/heads/main-${{matrix.platform}}
            *.cache-to=type=gha,scope=${{github.ref}}-${{matrix.platform}}
            ${{fromJson(needs.prepare.outputs.push) && '*.output=type=image,name=dunglas/frankenphp,push-by-digest=true,name-canonical=true,push=true' || ''}}
        env:
          LATEST: '1' # TODO: unset this variable when releasing the first stable version
          SHA: ${{github.sha}}
          VERSION: ${{github.ref_type == 'tag' && github.ref_name || github.sha}}
      -
        # Workaround for https://github.com/actions/runner/pull/2477#issuecomment-1501003600
        name: Export metadata
        if: fromJson(needs.prepare.outputs.push)
        run: |
          mkdir -p /tmp/metadata/builder /tmp/metadata/runner

          builderDigest="$(jq -r '."builder-${{matrix.variant}}"."containerimage.digest"' <<< "$METADATA")"
          touch "/tmp/metadata/builder/${builderDigest#sha256:}"
  
          runnerDigest="$(jq -r '."runner-${{matrix.variant}}"."containerimage.digest"' <<< "$METADATA")"
          touch "/tmp/metadata/runner/${runnerDigest#sha256:}"
        env:
          METADATA: ${{steps.build.outputs.metadata}}
      -
        name: Upload runner metadata
        if: fromJson(needs.prepare.outputs.push)
        uses: actions/upload-artifact@v3
        with:
          name: metadata-builder-${{matrix.variant}}
          path: /tmp/metadata/builder/*
          if-no-files-found: error
          retention-days: 1
      -
        name: Upload runner metadata
        if: fromJson(needs.prepare.outputs.push)
        uses: actions/upload-artifact@v3
        with:
          name: metadata-runner-${{matrix.variant}}
          path: /tmp/metadata/runner/*
          if-no-files-found: error
          retention-days: 1
      -
        name: Run tests
        if: '!matrix.qemu'
        continue-on-error: ${{fromJson(needs.prepare.outputs.push)}}
        run: |
          docker run --platform=${{matrix.platform}} --rm \
            "$(jq -r '."builder-${{matrix.variant}}"."containerimage.config.digest"' <<< "$METADATA")" \
            sh -c 'go test ${{matrix.race}} -v ./... && cd caddy && go test ${{matrix.race}} -v ./...'
        env:
          METADATA: ${{steps.build.outputs.metadata}}
  # Adapted from https://docs.docker.com/build/ci/github-actions/multi-platform/
  push:
    runs-on: ubuntu-latest    
    needs:
      - prepare
      - build
    if: fromJson(needs.prepare.outputs.push)
    strategy:
      fail-fast: false
      matrix:
        variant: ${{ fromJson(needs.prepare.outputs.variants) }}
        target: ['builder', 'runner']
    steps:
      -
        name: Download metadata
        uses: actions/download-artifact@v3
        with:
          name: metadata-${{matrix.target}}-${{matrix.variant}}
          path: /tmp/metadata
      -
        name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v2
        with:
          version: latest
      -
        name: Login to DockerHub
        uses: docker/login-action@v2
        with:
          username: ${{secrets.REGISTRY_USERNAME}}
          password: ${{secrets.REGISTRY_PASSWORD}}
      -
        name: Create manifest list and push
        working-directory: /tmp/metadata
        run: |
          docker buildx imagetools create "$(jq -cr '.target."${{matrix.target}}-${{matrix.variant}}".tags | map("-t " + .) | join(" ")' <<< "$METADATA")" \
            "$(printf 'dunglas/frankenphp@sha256:%s ' *)"
        env:
          METADATA: ${{needs.prepare.outputs.metadata}}
      -
        name: Inspect image
        run: docker buildx imagetools inspect "$(jq -cr '.target."${{matrix.target}}-${{matrix.variant}}".tags | first' <<< "$METADATA")"
        env:
          METADATA: ${{needs.prepare.outputs.metadata}}