name: Build Docker Image
on:
  ## 发布release的时候会自动构建
  release:
    types: [published]
  workflow_dispatch:
jobs:
  publish-docker-image:
    runs-on: ubuntu-latest
    name: Build image
    
    steps:
      - name: Checkout
        uses: actions/checkout@v2
        with:
          persist-credentials: false

      - name: judge has env GITHUB_REF  # 如果没有GITHUB_REF环境变量，则把github.ref变量赋值给GITHUB_REF
        run: |
          if [ -z "$GITHUB_REF" ]; then
            export GITHUB_REF=${{ github.ref }}
            echo $GITHUB_REF
          fi
      - name: Check version
        id: check_version
        run: |
          echo $GITHUB_REF
          # 如果是tag，则去掉refs/tags/前缀
          if [[ $GITHUB_REF == refs/tags/* ]]; then
            echo "It's a tag"
            echo $GITHUB_REF
            echo $GITHUB_REF | awk -F '/' '{print $3}'
            echo ::set-output name=version::$(echo $GITHUB_REF | awk -F '/' '{print $3}')
          else
            echo "It's not a tag"
            echo $GITHUB_REF
            echo ::set-output name=version::${GITHUB_REF}
          fi
      - name: Login to Registry
        run: docker login --username=${{ secrets.DOCKER_USERNAME }} --password ${{ secrets.DOCKER_PASSWORD }}
      - name: Create Buildx
        run: docker buildx create --name mybuilder --use
      - name: Build for Release # only relase, exlude pre-release
        if: ${{ github.event.release.prerelease == false }}
        run: docker buildx build --platform linux/amd64 -t rockchin/langbot:${{ steps.check_version.outputs.version }} -t rockchin/langbot:latest . --push
      - name: Build for Pre-release # no update for latest tag
        if: ${{ github.event.release.prerelease == true }}
        run: docker buildx build --platform linux/amd64 -t rockchin/langbot:${{ steps.check_version.outputs.version }} . --push