name: Docker multi-arch build and push

on:
  workflow_dispatch: ~

jobs:
  build:
    name: Build Docker image (${{ matrix.arch }})
    runs-on: ubuntu-latest
    env:
      IMAGE_TAG: ${{ secrets.DOCKER_USERNAME }}/telegram-bot-api
      ALPINE_VERSION: '3.20'
    strategy:
      matrix:
        arch:
          - linux/amd64

    steps:
      - name: Checkout current repo
        uses: actions/checkout@v4.1.6

      - name: Checkout upstream repo
        uses: actions/checkout@v4.1.6
        with:
          repository: paigramteam/telegram-bot-api
          path: telegram-bot-api
          submodules: recursive

      - name: Get version
        run: |
          # Get latest commit short hash
          HASH_VERSION=$(git rev-parse --short HEAD)
          
          # Get real version from the code
          VERSION=$(cat telegram-bot-api/CMakeLists.txt | grep TelegramBotApi | cut -d " " -f3)

          # Convert IMAGE_TAG, HASH_VERSION and VERSION to lowercase (repository name must be lowercase)
          IMAGE_TAG=$(echo "$IMAGE_TAG" | awk '{print tolower($0)}')
          VERSION=$(echo "$VERSION" | awk '{print tolower($0)}')
          ARCH=${{ matrix.arch }}
          SAFE_ARCH=${ARCH///}  # linux/amd64 -> linuxamd64

          # Store variable for future use
          echo "IMAGE_TAG=$IMAGE_TAG" >> $GITHUB_ENV
          echo "VERSION=$VERSION" >> $GITHUB_ENV
          echo "SAFE_ARCH=$SAFE_ARCH" >> $GITHUB_ENV

          # Print debug info
          echo "version: $VERSION"
          echo "safe arch: $SAFE_ARCH"

          # Save env to file
          cat $GITHUB_ENV > github.env

      - name: Upload environment info as artifact
        uses: actions/upload-artifact@v4.3.3
        if: matrix.arch == 'linux/amd64'  # Run this step only once per all matrix builds
        with:
          name: github_env
          path: github.env

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v3.0.0

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3.3.0

      - name: Cache Docker layers
        uses: actions/cache@v4.0.2
        with:
          path: /tmp/.buildx-cache
          key: ${{ runner.os }}-buildx-${{ env.SAFE_ARCH }}-${{ github.sha }}
          restore-keys: |
            ${{ runner.os }}-buildx-${{ env.SAFE_ARCH }}-

      - name: Login to Docker Hub registry
        uses: docker/login-action@v3.2.0
        if: ${{ github.event_name != 'pull_request' }}
        with:
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_TOKEN }}

      - name: Build image
        uses: docker/build-push-action@v5.3.0
        with:
          context: .
          file: ./Dockerfile
          cache-from: type=local,src=/tmp/.buildx-cache
          cache-to: type=local,mode=max,dest=/tmp/.buildx-cache
          platforms: ${{ matrix.arch }}
          build-args: |
            ALPINE_VERSION=${{ env.ALPINE_VERSION }}
          push: false
          load: true
          tags: |
            ${{ env.IMAGE_TAG }}:${{ env.VERSION }}-${{ env.SAFE_ARCH }}

      - name: Tag and push image
        if: ${{ github.event_name != 'pull_request' }}
        run: |
          docker push ${{ env.IMAGE_TAG }}:${{ env.VERSION }}-${{ env.SAFE_ARCH }}

      - name: Save image as tar archive
        if: ${{ github.event_name != 'pull_request' }}
        run: |
          docker save ${{ env.IMAGE_TAG }}:${{ env.VERSION }}-${{ env.SAFE_ARCH }} -o ${{ env.SAFE_ARCH }}.tar

      - name: Upload image as artifact
        uses: actions/upload-artifact@v4.3.0
        with:
          name: image_${{ env.SAFE_ARCH }}
          path: ${{ env.SAFE_ARCH }}.tar

  push-manifest:
    name: Create and push multi-arch Docker manifest
    runs-on: ubuntu-latest
    if: ${{ github.event_name != 'pull_request' }}
    env:
      DOCKER_CLI_EXPERIMENTAL: enabled
    needs: build

    steps:
      - name: Download artifacts
        uses: actions/download-artifact@v4.1.7

      - name: Load environment info and built images
        run: |
          cat github_env/github.env > $GITHUB_ENV
          docker load --input image_linuxamd64/linuxamd64.tar

      - name: Login to Docker Hub registry
        uses: docker/login-action@v3.2.0
        with:
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_TOKEN }}

      - name: Create and push manifest
        run: |
          docker manifest create ${{ env.IMAGE_TAG }}:${{ env.VERSION }} \
            --amend ${{ env.IMAGE_TAG }}:${{ env.VERSION }}-linuxamd64
          docker manifest push ${{ env.IMAGE_TAG }}:${{ env.VERSION }}

          docker manifest create ${{ env.IMAGE_TAG }}:latest \
            --amend ${{ env.IMAGE_TAG }}:${{ env.VERSION }}-linuxamd64
          docker manifest push ${{ env.IMAGE_TAG }}:latest