name: Preview FastGPT Image — Build

on:
  pull_request:
    types: [opened, synchronize, reopened]
    branches: ['*']

# Only one build per PR branch at a time
concurrency:
  group: 'preview-fastgpt-build-${{ github.head_ref }}'
  cancel-in-progress: true

permissions:
  contents: read

jobs:
  build:
    runs-on: ubuntu-24.04
    strategy:
      matrix:
        image: [fastgpt, sandbox, mcp_server]
      fail-fast: false

    steps:
      - name: Checkout PR code
        uses: actions/checkout@v4
        with:
          ref: ${{ github.event.pull_request.head.sha }}
          repository: ${{ github.event.pull_request.head.repo.full_name }}

      - name: Set image config
        id: config
        run: |
          if [[ "${{ matrix.image }}" == "fastgpt" ]]; then
            echo "DOCKERFILE=projects/app/Dockerfile" >> $GITHUB_OUTPUT
            echo "DESCRIPTION=fastgpt-pr image" >> $GITHUB_OUTPUT
            echo "IMAGE_NAME=fastgpt" >> $GITHUB_OUTPUT
          elif [[ "${{ matrix.image }}" == "sandbox" ]]; then
            echo "DOCKERFILE=projects/sandbox/Dockerfile" >> $GITHUB_OUTPUT
            echo "DESCRIPTION=fastgpt-sandbox-pr image" >> $GITHUB_OUTPUT
            echo "IMAGE_NAME=fastgpt-sandbox" >> $GITHUB_OUTPUT
          elif [[ "${{ matrix.image }}" == "mcp_server" ]]; then
            echo "DOCKERFILE=projects/mcp_server/Dockerfile" >> $GITHUB_OUTPUT
            echo "DESCRIPTION=fastgpt-mcp_server-pr image" >> $GITHUB_OUTPUT
            echo "IMAGE_NAME=fastgpt-mcp-server" >> $GITHUB_OUTPUT
          fi

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

      - name: Build Docker image (no push)
        uses: docker/build-push-action@v6
        with:
          context: .
          file: ${{ steps.config.outputs.DOCKERFILE }}
          platforms: linux/amd64
          push: false
          tags: ${{ steps.config.outputs.IMAGE_NAME }}-pr:${{ github.event.pull_request.head.sha }}
          labels: |
            org.opencontainers.image.source=https://github.com/${{ github.repository_owner }}/FastGPT
            org.opencontainers.image.description=${{ steps.config.outputs.DESCRIPTION }}
            org.opencontainers.image.revision=${{ github.event.pull_request.head.sha }}
          outputs: type=docker,dest=/tmp/${{ steps.config.outputs.IMAGE_NAME }}-image.tar
          cache-from: type=gha,scope=${{ matrix.image }}
          cache-to: type=gha,mode=max,scope=${{ matrix.image }}

      - name: Save PR metadata
        run: |
          echo "${{ github.event.pull_request.number }}" > /tmp/pr-number.txt
          echo "${{ github.event.pull_request.head.sha }}" > /tmp/pr-sha.txt
          echo "${{ matrix.image }}" > /tmp/image-type.txt

      - name: Upload Docker image artifact
        uses: actions/upload-artifact@v4
        with:
          name: preview-${{ matrix.image }}-image
          path: |
            /tmp/${{ steps.config.outputs.IMAGE_NAME }}-image.tar
            /tmp/pr-number.txt
            /tmp/pr-sha.txt
            /tmp/image-type.txt
          retention-days: 1