name: Docker Build & Publish

on:
  push:
    branches:
      - main
      - development
    tags:
      - 'v*.*.*'
  pull_request:
    branches:
      - main
      - development
  workflow_call:  # Allow this workflow to be called by other workflows

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

jobs:
  build-and-push:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
      security-events: write

    steps:
      - name: Checkout repository
        uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@e468171a9de216ec08956ac3ada2f0791b6bd435 # v3

      - name: Resolve Caddy base digest
        id: caddy
        run: |
          docker pull caddy:2-alpine
          DIGEST=$(docker inspect --format='{{index .RepoDigests 0}}' caddy:2-alpine)
          echo "image=$DIGEST" >> $GITHUB_OUTPUT

      - name: Log in to Container Registry
        if: github.event_name != 'pull_request'
        uses: docker/login-action@5e57cd118135c172c3672efd75eb46360885c0ef # v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract metadata (tags, labels)
        id: meta
        uses: docker/metadata-action@318604b99e75e41977312d83839a89be02ca4893 # v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            # Tag 'latest' for main branch
            type=raw,value=latest,enable={{is_default_branch}}
            # Tag 'dev' for development branch
            type=raw,value=dev,enable=${{ github.ref == 'refs/heads/development' }}
            # Semver tags for version releases (v1.0.0 -> 1.0.0, 1.0, 1)
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=semver,pattern={{major}}

      - name: Build and push Docker image
        id: build-and-push
        uses: docker/build-push-action@ca052bb54ab0790a636c9b5f226502c73d547a25 # v5
        with:
          context: .
          platforms: linux/amd64,linux/arm64
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max
          build-args: |
            VERSION=${{ steps.meta.outputs.version }}
            BUILD_DATE=${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.created'] }}
            VCS_REF=${{ github.sha }}
            CADDY_IMAGE=${{ steps.caddy.outputs.image }}

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

      - name: Run Trivy scan (table output first for visibility)
        if: github.event_name != 'pull_request'
        id: trivy_table
        continue-on-error: true
        uses: aquasecurity/trivy-action@master
        with:
          image-ref: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}@${{ steps.build-and-push.outputs.digest }}
          format: 'table'
          severity: 'CRITICAL,HIGH'
          exit-code: '0'

      - name: Run Trivy vulnerability scanner
        if: github.event_name != 'pull_request'
        id: trivy
        continue-on-error: true
        uses: aquasecurity/trivy-action@master
        with:
          image-ref: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}@${{ steps.build-and-push.outputs.digest }}
          format: 'sarif'
          output: 'trivy-results.sarif'
          exit-code: '0'
          severity: 'CRITICAL,HIGH'

      - name: Upload Trivy results to GitHub Security
        if: github.event_name != 'pull_request' && (steps.trivy.outcome == 'success' || steps.trivy.outcome == 'failure')
        uses: github/codeql-action/upload-sarif@v3
        with:
          sarif_file: 'trivy-results.sarif'

      - name: Check for vulnerabilities
        if: github.event_name != 'pull_request' && steps.trivy_table.outcome == 'failure'
        run: |
          echo "::error::CRITICAL or HIGH vulnerabilities found in image"
          exit 1