name: Docker Build & Push

on:
  push:
    branches: [main, develop]
    tags:
      - 'v*.*.*'
  pull_request:
    branches: [main]
  workflow_dispatch:
    inputs:
      push_image:
        description: 'Push image to registry'
        required: false
        default: 'false'
        type: boolean

env:
  # --- Configure your registry and image name ---
  REGISTRY: ghcr.io                                     # or docker.io, 123456789.dkr.ecr.us-east-1.amazonaws.com, etc.
  IMAGE_NAME: ${{ github.repository }}                  # e.g. org/my-app
  PLATFORMS: linux/amd64,linux/arm64

permissions:
  contents: read
  packages: write        # push to GHCR
  id-token: write        # for OIDC-based cloud registry auth (AWS ECR, GCP AR)
  security-events: write # upload Trivy SARIF

jobs:
  build-and-push:
    name: Build & Push — ${{ matrix.dockerfile }}
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      matrix:
        include:
          - dockerfile: Dockerfile
            image_suffix: ''
          # Add more Dockerfiles here, e.g.:
          # - dockerfile: Dockerfile.worker
          #   image_suffix: -worker

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

      - name: Set up QEMU (multi-platform builds)
        uses: docker/setup-qemu-action@v3

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

      - name: Log in to registry
        if: github.event_name != 'pull_request' || github.event.inputs.push_image == 'true'
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
          # For Docker Hub:
          # username: ${{ secrets.DOCKERHUB_USERNAME }}
          # password: ${{ secrets.DOCKERHUB_TOKEN }}
          # For AWS ECR (use OIDC instead of long-lived keys):
          # See aws-actions/amazon-ecr-login step below

      # --- AWS ECR (uncomment to use) ---
      # - name: Configure AWS credentials (OIDC)
      #   uses: aws-actions/configure-aws-credentials@v4
      #   with:
      #     role-to-assume: ${{ secrets.AWS_ROLE_ARN }}
      #     aws-region: us-east-1
      #
      # - name: Log in to Amazon ECR
      #   id: ecr-login
      #   uses: aws-actions/amazon-ecr-login@v2

      - name: Extract metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}${{ matrix.image_suffix }}
          tags: |
            type=ref,event=branch
            type=ref,event=pr
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=semver,pattern={{major}}
            type=sha,prefix=sha-,format=short
            type=raw,value=latest,enable=${{ github.ref == 'refs/heads/main' }}

      - name: Build and push
        id: build
        uses: docker/build-push-action@v6
        with:
          context: .
          file: ${{ matrix.dockerfile }}
          platforms: ${{ env.PLATFORMS }}
          push: ${{ github.event_name != 'pull_request' || github.event.inputs.push_image == 'true' }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max
          provenance: true    # SBOM provenance attestation
          sbom: true

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

  scan:
    name: Trivy — image vulnerability scan
    runs-on: ubuntu-latest
    needs: build-and-push
    if: github.event_name != 'pull_request'
    steps:
      - name: Log in to registry
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Run Trivy on pushed image
        uses: aquasecurity/trivy-action@master
        with:
          image-ref: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest
          format: sarif
          output: trivy-image.sarif
          severity: HIGH,CRITICAL
          exit-code: '0'

      - name: Upload Trivy results
        uses: github/codeql-action/upload-sarif@v3
        with:
          sarif_file: trivy-image.sarif