name: Build & Push to Gitea Registry (version.txt trigger)

on:
  push:
    branches: [ main, master ]
    paths:
      - version.txt

jobs:
  build-and-push:
    runs-on: ubuntu-latest

    permissions:
      contents: read
      packages: write

    env:
      REGISTRY: ${{ vars.REGISTRY }}
      IMAGE: ${{ github.repository }}

    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Read version.txt
        id: ver
        shell: bash
        run: |
          VERSION="$(cat version.txt | tr -d '\r\n' | xargs)"
          if [ -z "$VERSION" ]; then
            echo "version.txt is empty" >&2
            exit 1
          fi
          echo "version=$VERSION" >> "$GITHUB_OUTPUT"

      - name: Ensure Dockerfile exists
        shell: bash
        run: |
          if [ -f Dockerfile ]; then
            echo "Dockerfile already exists."
            exit 0
          fi

          echo "Dockerfile missing; generating one..."
          cat > Dockerfile <<'EOF'
          FROM nginx:alpine
          COPY website/ /usr/share/nginx/html/
          COPY default.conf /etc/nginx/conf.d/default.conf
          EXPOSE 80
          EOF

          ls -la Dockerfile

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

      - name: Log in to Gitea Container Registry
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ secrets.USER }}
          password: ${{ secrets.TOKEN }}

      - name: Build and push
        uses: docker/build-push-action@v6
        with:
          context: .
          file: ./Dockerfile
          push: true
          build-args: |
            VERSION=${{ steps.ver.outputs.version }}
          tags: |
            ${{ env.REGISTRY }}/${{ env.IMAGE }}:latest
            ${{ env.REGISTRY }}/${{ env.IMAGE }}:${{ steps.ver.outputs.version }}
            ${{ env.REGISTRY }}/${{ env.IMAGE }}:${{ github.sha }}