name: Build PR

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

env:
  REGISTRY: ghcr.io

jobs:
  build-and-push-image:
    runs-on: ubuntu-latest
    environment:
      name: pr-build
    permissions:
      contents: read
      packages: write
      id-token: write
      attestations: write

    steps:
      - name: Checkout PR code
        uses: actions/checkout@v3
        with:
          ref: ${{ github.event.pull_request.head.sha }}

      - name: Extract PR information
        id: extract_pr
        run: |
          echo "PR_NUMBER=$${{ github.event.pull_request.number || github.run_number }}" >> $GITHUB_ENV
          echo "REGISTRY_LOWER=$(echo '${{ env.REGISTRY }}' | tr '[:upper:]' '[:lower:]')" >> $GITHUB_ENV
          echo "REPOSITORY_LOWER=$(echo '${{ github.repository }}' | tr '[:upper:]' '[:lower:]')" >> $GITHUB_ENV

      - name: Log in to the Container registry
        uses: docker/login-action@v3.1.0
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ github.token }}

      # Build Docker Images (amd64 and arm64)
      - name: Set up QEMU
        uses: docker/setup-qemu-action@v3

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

      - name: Create version files
        run: |
          echo "pr-${{ env.PR_NUMBER }}" > version.txt
          echo "${{ github.sha }}" > version_githash.txt
          ls -ltr

      - name: Build and push Docker image
        id: push
        uses: docker/build-push-action@v5.3.0
        with:
          context: .
          platforms: linux/amd64,linux/aarch64
          push: true
          tags: |
            ${{ env.REGISTRY_LOWER }}/linux-voice-assistant-pr:${{ env.PR_NUMBER }}
          labels: |
            pr=${{ env.PR_NUMBER }}

      - name: Generate artifact attestation
        uses: actions/attest-build-provenance@v1.4.4
        with:
          subject-name: ${{ env.REGISTRY }}/linux-voice-assistant-pr
          subject-digest: ${{ steps.push.outputs.digest }}
          push-to-registry: true