name: Build and Push Builder Image

on:
  pull_request:
    paths:
      - 'Dockerfile.builder'
      - '.github/workflows/builder.yml'

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}-builder
  GOLANG_VERSION: '1.25.1'
  FFMPEG_VERSION: '7.1.1'
  VIPS_VERSION: '8.17.2'

jobs:
  build-builder:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

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

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

      - name: Set build arguments
        id: args
        run: |
          echo "ffmpeg_version=${{ env.FFMPEG_VERSION }}" >> $GITHUB_OUTPUT
          echo "vips_version=${{ env.VIPS_VERSION }}" >> $GITHUB_OUTPUT
          echo "golang_version=${{ env.GOLANG_VERSION }}" >> $GITHUB_OUTPUT
          
          # Create version tag
          VERSION_TAG="ffmpeg-${{ env.FFMPEG_VERSION }}-vips-${{ env.VIPS_VERSION }}-go-${{ env.GOLANG_VERSION }}"
          echo "version_tag=${VERSION_TAG}" >> $GITHUB_OUTPUT

      - name: Extract metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            type=raw,value=latest
            type=raw,value=${{ steps.args.outputs.version_tag }}

      - name: Build and push builder image
        uses: docker/build-push-action@v5
        with:
          context: .
          file: ./Dockerfile.builder
          platforms: linux/amd64,linux/arm64
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          build-args: |
            GOLANG_VERSION=${{ steps.args.outputs.golang_version }}
            FFMPEG_VERSION=${{ steps.args.outputs.ffmpeg_version }}
            VIPS_VERSION=${{ steps.args.outputs.vips_version }}
          cache-from: type=gha
          cache-to: type=gha,mode=max

      - name: Image digest
        run: echo ${{ steps.build.outputs.digest }}