name: Build and Push Docker Images

on:
  push:
    branches: [ main ]
    paths:
      - '*/Dockerfile'
      - '.gitea/workflows/docker-build.yml'

jobs:
  detect-changes:
    runs-on: ubuntu-latest
    container: git.hofer.link/philipp/ci-images:rust-latest
    outputs:
      matrix: ${{ steps.set-matrix.outputs.matrix }}
    steps:
      - name: Checkout code
        uses: actions/checkout@v3
        with:
          fetch-depth: 0

      - name: Detect changed directories
        id: set-matrix
        run: |
          CHANGED_DIRS=$(git diff --name-only ${{ github.event.before }} ${{ github.sha }} | grep 'Dockerfile' | xargs -L1 dirname | sort | uniq | jq -R -s -c 'split("\n") | map(select(length > 0))')
          echo "matrix=${CHANGED_DIRS}" >> $GITHUB_OUTPUT

  build:
    needs: detect-changes
    if: ${{ needs.detect-changes.outputs.matrix != '[]' && needs.detect-changes.outputs.matrix != '' }}
    runs-on: ubuntu-latest
    container: git.hofer.link/philipp/ci-images:rust-latest
    strategy:
      matrix:
        image_dir: ${{ fromJson(needs.detect-changes.outputs.matrix) }}
    steps:
      - name: Checkout code
        uses: actions/checkout@v3

      - name: Login to Gitea Container Registry
        uses: docker/login-action@v2
        with:
          registry: git.hofer.link
          username: ${{ secrets.GITEA_USERNAME }}
          password: ${{ secrets.GITEA_PASSWORD }}

      - name: Extract image name from directory
        id: image-name
        run: |
          IMAGE_NAME=$(basename ${{ matrix.image_dir }})
          echo "name=${IMAGE_NAME}" >> $GITHUB_OUTPUT

      - name: Build and push
        uses: docker/build-push-action@v4
        with:
          context: ${{ matrix.image_dir }}
          push: true
          tags: git.hofer.link/philipp/ci-images:${{ steps.image-name.outputs.name }}