name: Docker Build, Push & Security Scan

on:
  push:
    branches: [main]
    tags: ['v*']
    paths:
      - 'Dockerfile'
      - '.dockerignore'
      - 'package.json'
      - 'bun.lock*'
      - '.github/workflows/docker-build.yml'
  pull_request:
    paths:
      - 'Dockerfile'
      - '.dockerignore'
      - 'package.json'
      - 'bun.lock*'
      - '.github/workflows/docker-build.yml'
  schedule:
    - cron: '0 0 * * 0'  # Weekly security scan on Sunday at midnight

env:
  REGISTRY: ghcr.io
  IMAGE: ${{ github.repository }}
  SHA: ${{ github.event.pull_request.head.sha || github.event.after }}

jobs:
  docker:
    runs-on: ubuntu-latest

    permissions:
      contents: write
      packages: write
      security-events: write
      pull-requests: write

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          ref: ${{ env.SHA }}

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3
        with:
          driver-opts: network=host

      - name: Log into registry
        uses: docker/login-action@v3
        if: github.event_name != 'pull_request'
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      # Login to Docker Hub for Docker Scout (optional - provides better vulnerability data)
      # Add DOCKERHUB_USERNAME and DOCKERHUB_TOKEN secrets to enable this
      - name: Log into Docker Hub
        uses: docker/login-action@v3
        continue-on-error: true
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}

      # Extract version from tag if present
      - name: Extract version from tag
        id: tag_version
        run: |
          if [[ $GITHUB_REF == refs/tags/v* ]]; then
            echo "VERSION=${GITHUB_REF#refs/tags/}" >> $GITHUB_OUTPUT
            echo "Using version tag: ${GITHUB_REF#refs/tags/}"
          else
            echo "VERSION=latest" >> $GITHUB_OUTPUT
            echo "No version tag, using 'latest'"
          fi

      # Extract metadata for Docker
      - name: Extract Docker metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE }}
          labels: |
            org.opencontainers.image.revision=${{ env.SHA }}
          tags: |
            type=edge,branch=$repo.default_branch
            type=semver,pattern=v{{version}}
            type=sha,prefix=,suffix=,format=short
            type=raw,value=latest,enable={{is_default_branch}}
            type=raw,value=${{ steps.tag_version.outputs.VERSION }}

      # Build and push Docker image
      - name: Build and push Docker image
        id: build-and-push
        uses: docker/build-push-action@v5
        with:
          context: .
          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: ${{ github.event_name == 'pull_request' && 'gitea-mirror:scan' || steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max

      # Wait for image to be available in registry
      - name: Wait for image availability
        if: github.event_name != 'pull_request'
        run: |
          echo "Waiting for image to be available in registry..."
          sleep 5

      # Docker Scout comprehensive security analysis
      - name: Docker Scout - Vulnerability Analysis & Recommendations
        uses: docker/scout-action@v1
        if: github.event_name != 'pull_request'
        with:
          command: cves,recommendations
          image: ${{ env.REGISTRY }}/${{ env.IMAGE }}:latest
          sarif-file: scout-results.sarif
          summary: true
          exit-code: false
          only-severities: critical,high
          write-comment: true
          github-token: ${{ secrets.GITHUB_TOKEN }}

      # Docker Scout for Pull Requests (using local image)
      - name: Docker Scout - Vulnerability Analysis (PR)
        uses: docker/scout-action@v1
        if: github.event_name == 'pull_request'
        with:
          command: cves,recommendations
          image: local://gitea-mirror:scan
          sarif-file: scout-results.sarif
          summary: true
          exit-code: false
          only-severities: critical,high
          write-comment: true
          github-token: ${{ secrets.GITHUB_TOKEN }}

      # Compare to latest for PRs and pushes
      - name: Docker Scout - Compare to Latest
        uses: docker/scout-action@v1
        if: github.event_name == 'pull_request'
        with:
          command: compare
          image: local://gitea-mirror:scan
          to: ${{ env.REGISTRY }}/${{ env.IMAGE }}:latest
          ignore-unchanged: true
          only-severities: critical,high
          write-comment: true
          github-token: ${{ secrets.GITHUB_TOKEN }}

      # Upload security scan results to GitHub Security tab
      - name: Upload Docker Scout scan results to GitHub Security tab
        uses: github/codeql-action/upload-sarif@v3
        if: always()
        continue-on-error: true
        with:
          sarif_file: scout-results.sarif