name: PR Docker Build

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

permissions:
  contents: read
  packages: write
  pull-requests: write

jobs:
  docker:
    name: Build PR Docker Image
    runs-on: ubuntu-latest
    
    steps:
      - name: Checkout
        uses: actions/checkout@v4

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

      - name: Login to GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ghcr.io/${{ github.repository }}
          tags: |
            # PR-specific tag for testing
            type=raw,value=pr-${{ github.event.number }}-${{ github.sha }}
            type=raw,value=pr-${{ github.event.number }}

      - name: Build and push Docker image
        uses: docker/build-push-action@v5
        with:
          context: .
          platforms: linux/amd64,linux/arm64
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max

      - name: Comment on PR with Docker info
        uses: actions/github-script@v7
        with:
          script: |
            const prNumber = context.payload.pull_request.number;
            const sha = context.sha.substring(0, 7);
            const repo = context.repo.repo;
            const owner = context.repo.owner;
            
            const comment = `🐳 **Docker Image Built Successfully**
            
            This PR has been built and pushed as a Docker image for testing:
            
            **Available Tags:**
            - \`ghcr.io/${owner}/${repo}:pr-${prNumber}-${context.sha}\`
            - \`ghcr.io/${owner}/${repo}:pr-${prNumber}\` (latest for this PR)
            
            **Test the changes:**
            \`\`\`bash
            docker pull ghcr.io/${owner}/${repo}:pr-${prNumber}
            \`\`\`
            
            **Claude Desktop configuration:**
            \`\`\`json
            {
              "mcpServers": {
                "zen-mcp-server": {
                  "command": "docker",
                  "args": [
                    "run", "--rm", "-i",
                    "-e", "GEMINI_API_KEY",
                    "ghcr.io/${owner}/${repo}:pr-${prNumber}"
                  ],
                  "env": {
                    "GEMINI_API_KEY": "your-api-key-here"
                  }
                }
              }
            }
            \`\`\`
            
            The image will be updated automatically when you push new commits to this PR.`;
            
            github.rest.issues.createComment({
              issue_number: prNumber,
              owner: owner,
              repo: repo,
              body: comment
            });

      - name: Create deployment summary
        run: |
          echo "## 🐳 PR Docker Build Complete" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY
          echo "**PR**: #${{ github.event.number }}" >> $GITHUB_STEP_SUMMARY
          echo "**Commit**: ${{ github.sha }}" >> $GITHUB_STEP_SUMMARY
          echo "**Images built:**" >> $GITHUB_STEP_SUMMARY
          echo "\`\`\`" >> $GITHUB_STEP_SUMMARY
          echo "${{ steps.meta.outputs.tags }}" >> $GITHUB_STEP_SUMMARY
          echo "\`\`\`" >> $GITHUB_STEP_SUMMARY