---
# yaml-language-server: $schema=https://json.schemastore.org/github-workflow.json
name: PR Build and Report

on:
  pull_request:
    types: [opened, synchronize, reopened]

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

env:
  # Use docker.io for Docker Hub if empty
  REGISTRY: ghcr.io
  # github.repository as <account>/<repo>
  IMAGE_NAME: ${{ github.repository }}

permissions: read-all

jobs:
  pr-build:
    name: PR Build
    runs-on: ubuntu-latest
    timeout-minutes: 30

    permissions:
      contents: read
      issues: write
      pull-requests: write
      statuses: write

    strategy:
      fail-fast: false
      matrix:
        php: [php74, php80, php81, php82, php83, php84]
        arch: ["linux/amd64", "linux/arm64"]

    steps:
      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2

      - name: Set result filename
        id: resultfile
        run: |
          TAG_ARCH="${{ matrix.arch }}"
          TAG_ARCH="${TAG_ARCH//\//-}"
          FILENAME="result-${{ matrix.php }}-${TAG_ARCH}.json"
          echo "filename=$FILENAME" >> "$GITHUB_OUTPUT"
          echo "tag_arch=$TAG_ARCH" >> "$GITHUB_OUTPUT"

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@18ce135bb5112fa8ce4ed6c17ab05699d7f3a5e0 # v3.11.0

      - name: Log in to the Container registry
        uses: docker/login-action@74a5d142397b4f367a81961eba4e8cd7edddf772 # v3.4.0
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Docker metadata
        id: meta
        uses: docker/metadata-action@902fa8ec7d6ecbf8d84d538b9b233a880e428804 # v5.7.0
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ matrix.php }}
          tags: |
            type=raw,value=${{ matrix.php }}-${{ matrix.arch }}

      - name: Extract base image
        id: baseimage
        run: |
          BASE_IMAGE="$(grep -m1 '^FROM ' ${{ env.DOCKERFILE_PATH }} | awk '{print $2}')"
          echo "base_image=$BASE_IMAGE" >> "$GITHUB_OUTPUT"

      - name: Build Docker image (capture cache usage)
        id: build
        shell: bash
        run: |
          TAG_ARCH="${{ steps.resultfile.outputs.tag_arch }}"
          IMAGE_TAG="${{ env.IMAGE_NAME }}:${{ matrix.php }}-${TAG_ARCH}"
          START="$(date +%s)"
          docker buildx build \
            --platform ${{ matrix.arch }} \
            --tag "$IMAGE_TAG" \
            --progress plain \
            --load ./${{ matrix.php }}/ | tee build.log
          END="$(date +%s)"
          echo "duration=$((END-START))" >> "$GITHUB_OUTPUT"
          if grep -q 'CACHED' build.log; then
            echo "cache_used=true" >> "$GITHUB_OUTPUT"
          else
            echo "cache_used=false" >> "$GITHUB_OUTPUT"
          fi

      - name: Get image size
        id: image_info
        shell: bash
        run: |
          TAG_ARCH="${{ steps.resultfile.outputs.tag_arch }}"
          IMAGE="${{ env.IMAGE_NAME }}:${{ matrix.php }}-${TAG_ARCH}"
          SIZE="$(docker image inspect "$IMAGE" --format='{{.Size}}')"
          SIZE_MB="$((SIZE/1024/1024))"
          echo "size_mb=$SIZE_MB" >> "$GITHUB_OUTPUT"

      - name: Save build result
        shell: bash
        run: |
          jq -n \
            --arg php "${{ matrix.php }}" \
            --arg arch "${{ matrix.arch }}" \
            --arg status "success" \
            --arg duration "${{ steps.build.outputs.duration }}" \
            --arg size_mb "${{ steps.image_info.outputs.size_mb }}" \
            --arg base_image "${{ steps.baseimage.outputs.base_image }}" \
            --arg cache_used "${{ steps.build.outputs.cache_used }}" \
            '{
              php: $php,
              arch: $arch,
              status: $status,
              duration: $duration,
              size_mb: $size_mb,
              base_image: $base_image,
              cache_used: $cache_used
            }' > ${{ steps.resultfile.outputs.filename }}

      - name: Move result file to output directory
        shell: bash
        run: |
          mkdir -p results
          mv ${{ steps.resultfile.outputs.filename }} results/

      - name: Upload build result
        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
        with:
          name: build-results
          path: results/
          overwrite: true
          if-no-files-found: warn

  aggregate-results:
    name: Aggregate Results and Comment
    runs-on: ubuntu-latest
    needs: pr-build

    permissions:
      contents: read
      issues: write
      pull-requests: write
      statuses: write

    if: github.event_name == 'pull_request'
    steps:
      - name: Download all build results
        uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093 # v4.3.0
        with:
          name: build-results
          path: results

      - name: Summarize results
        id: summarize
        shell: bash
        run: |
          {
            echo "## Build Matrix Results"
            echo ""
            echo "| PHP Version | Architecture | Status  | Duration (s) | Image Size (MB) | Base Image | Cache Used |"
            echo "|-------------|--------------|---------|--------------|-----------------|------------|------------|"
          } > comment.md
          for f in results/*.json; do
            php=$(jq -r .php "$f")
            arch=$(jq -r .arch "$f")
            status=$(jq -r .status "$f")
            duration=$(jq -r .duration "$f")
            size_mb=$(jq -r .size_mb "$f")
            base_image=$(jq -r .base_image "$f")
            cache_used=$(jq -r .cache_used "$f")
            echo "| $php | $arch | $status | $duration | $size_mb | $base_image | $cache_used |" >> comment.md
          done

      - name: Create or update PR comment
        uses: peter-evans/create-or-update-comment@71345be0265236311c031f5c7866368bd1eff043 # v4.0.0
        with:
          token: ${{ secrets.GITHUB_TOKEN }}
          issue-number: ${{ github.event.pull_request.number }}
          body-file: comment.md