name: Build Docker Image

on:
  push:
    tags:
      - 'v**'
  schedule:
    - cron: '0 1 * * *'

jobs:
  build-and-push-image:
    name: Docker Build
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write

    steps:
    - name: Check out code
      uses: actions/checkout@v4

    - name: Check for new commits (nightly only)
      id: check
      if: github.event_name == 'schedule'
      continue-on-error: false
      run: |
        # 3AM CET
        since="$(date -d 'yesterday' +%Y-%m-%d) 01:00:00"
        count=$(git rev-list --count --since="$since" --until=now HEAD)
        if [ "$count" -gt 0 ]; then
          echo "new_commits=true" >> $GITHUB_OUTPUT
        else
          echo "no new commits found for nightly build"
          exit 1
        fi

    - name: Set version
      id: buildvars
      run: |
        if [ "${{ github.event_name }}" = "schedule" ]; then
          echo "version=$(date +'%Y.%m.%d-nightly')" >> $GITHUB_OUTPUT
        else
          echo "version=$(echo ${GITHUB_REF#refs/tags/})" >> $GITHUB_OUTPUT
        fi
        echo "built_at=$(date +%Y-%m-%dT%H:%M:%S)" >> $GITHUB_OUTPUT
        echo "git_commit=$(git rev-parse HEAD)" >> $GITHUB_OUTPUT

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

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

    - name: Cache Docker layers
      uses: actions/cache@v3
      with:
        path: /tmp/.buildx-cache
        key: ${{ runner.os }}-buildx-${{ github.sha }}
        restore-keys: |
          ${{ runner.os }}-buildx-

    - name: Log in to GitHub Container Registry
      uses: docker/login-action@v3
      with:
        registry: ghcr.io
        username: ${{ github.actor }}
        password: ${{ secrets.GITHUB_TOKEN }}

    - name: Extract metadata (tags, labels) for Docker
      id: meta
      uses: docker/metadata-action@v5
      with:
        images: |
          ghcr.io/${{ github.repository }}${{ !contains(github.ref, '-rc') && !contains(github.ref, '-nightly') && '-testing' || '' }}

    - name: Build and push Docker image
      uses: docker/build-push-action@v5
      with:
        context: .
        platforms: linux/amd64,linux/arm64,linux/arm/v7
        push: true
        tags: ${{ steps.meta.outputs.tags }}
        labels: ${{ steps.meta.outputs.labels }}
        cache-from: type=local,src=/tmp/.buildx-cache
        cache-to: type=local,dest=/tmp/.buildx-cache
        build-args: |
          BuiltAt=${{ steps.buildvars.outputs.built_at }}
          GitCommit=${{ steps.buildvars.outputs.git_commit }}
          Version=${{ steps.buildvars.outputs.version }}