name: Docker Build and Publish

on:
  push:
    branches:
      - main
      - develop
    tags:
      - 'v*'
  pull_request:
    branches:
      - main
      - develop
  workflow_dispatch:

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}

jobs:
  build-and-test:
    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 GitHub Container Registry
        if: github.event_name != 'pull_request'
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            type=ref,event=branch
            type=ref,event=pr
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=semver,pattern={{major}}
            type=sha
            type=raw,value=latest,enable={{is_default_branch}}

      - name: Build Docker image
        uses: docker/build-push-action@v5
        with:
          context: .
          file: ./Dockerfile
          platforms: ${{ github.event_name == 'pull_request' && 'linux/amd64' || 'linux/amd64,linux/arm64' }}
          push: ${{ github.event_name != 'pull_request' }}
          load: ${{ github.event_name == 'pull_request' }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max

      - name: Test Docker image
        run: |
          set -e  # Exit immediately if a command exits with a non-zero status
          echo "Testing SparkOS Docker image..."
          # Get the first tag from the metadata output
          IMAGE_TAG=$(echo "${{ steps.meta.outputs.tags }}" | head -n1)
          echo "Using image: $IMAGE_TAG"
          
          # For PRs, image is loaded locally; for branches, pull from GHCR
          if [ "${{ github.event_name }}" != "pull_request" ]; then
            echo "Pulling image from GHCR for testing..."
            docker pull "$IMAGE_TAG"
          fi
          
          # Run the container and check output
          echo "Running container entrypoint test..."
          if ! docker run --rm "$IMAGE_TAG"; then
            echo "ERROR: Container entrypoint test failed!"
            exit 1
          fi
          
          # Verify init binary exists and is executable
          echo "Verifying init binary is executable..."
          if ! docker run --rm "$IMAGE_TAG" sh -c "test -x /sparkos/rootfs/sbin/init && echo 'Init binary is executable'"; then
            echo "ERROR: Init binary verification failed!"
            exit 1
          fi
          
          echo "Docker image test completed successfully!"

      - name: Output image details
        if: github.event_name != 'pull_request'
        run: |
          echo "### Docker Image Published! 🐳" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY
          echo "**Registry:** ${{ env.REGISTRY }}" >> $GITHUB_STEP_SUMMARY
          echo "**Repository:** ${{ env.IMAGE_NAME }}" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY
          echo "**Tags:**" >> $GITHUB_STEP_SUMMARY
          echo '```' >> $GITHUB_STEP_SUMMARY
          echo "${{ steps.meta.outputs.tags }}" >> $GITHUB_STEP_SUMMARY
          echo '```' >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY
          echo "**Pull command:**" >> $GITHUB_STEP_SUMMARY
          echo '```bash' >> $GITHUB_STEP_SUMMARY
          echo "docker pull ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest" >> $GITHUB_STEP_SUMMARY
          echo '```' >> $GITHUB_STEP_SUMMARY