name: Docker Image bauen & veröffentlichen

on:
  # Kein Build auf Branch-Pushes (dev/main).
  # Build nur, wenn ein Versions-Tag (v*) gesetzt wird
  # -> also beim Release-Merge dev -> main inkl. Tag.
  push:
    tags:
      - "v*"
  workflow_dispatch:

env:
  # Host der Gitea Container Registry (bei Bedarf als Repo-Variable REGISTRY überschreiben)
  REGISTRY: ${{ vars.REGISTRY || 'git.hexahost.dev' }}
  IMAGE_NAME: ${{ github.repository }}

jobs:
  build-and-push:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write

    steps:
      - name: Repository auschecken
        uses: actions/checkout@v4

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

      - name: Registry-Anmeldung prüfen (Diagnose)
        env:
          REG_USER: ${{ secrets.REGISTRY_USER || github.repository_owner }}
          REG_TOKEN: ${{ secrets.REGISTRY_TOKEN }}
        run: |
          IMAGE_LOWER=$(echo "${IMAGE_NAME}" | tr '[:upper:]' '[:lower:]')
          echo "Registry:      ${REGISTRY}"
          echo "Username:       '${REG_USER}'  (Laenge: ${#REG_USER})"
          echo "Token gesetzt:  $([ -n "${REG_TOKEN}" ] && echo ja || echo NEIN)  (Laenge: ${#REG_TOKEN})"
          echo "Image (lower):  ${IMAGE_LOWER}"

          echo "--- API-Test: /api/v1/user (Basic-Auth gueltig?) ---"
          curl -s -o /dev/null -w "HTTP %{http_code}\n" -u "${REG_USER}:${REG_TOKEN}" "https://${REGISTRY}/api/v1/user"

          echo "--- /v2/ Challenge (WWW-Authenticate) ---"
          HDR=$(curl -s -D - -o /dev/null "https://${REGISTRY}/v2/")
          AUTH=$(printf '%s' "$HDR" | tr -d '\r' | grep -i '^www-authenticate:' || true)
          echo "${AUTH:-(keine WWW-Authenticate Zeile)}"
          REALM=$(printf '%s' "$AUTH" | sed -n 's/.*realm="\([^"]*\)".*/\1/p')
          SERVICE=$(printf '%s' "$AUTH" | sed -n 's/.*service="\([^"]*\)".*/\1/p')
          echo "realm='${REALM}'  service='${SERVICE}'"

          if [ -n "${REALM}" ]; then
            echo "--- Token-Request am echten realm ---"
            CODE=$(curl -s -o /tmp/tok.json -w "%{http_code}" -u "${REG_USER}:${REG_TOKEN}" \
              "${REALM}?service=${SERVICE}&scope=repository:${IMAGE_LOWER}:pull,push")
            echo "HTTP ${CODE}"
            echo "Antwort (gekuerzt): $(head -c 300 /tmp/tok.json)"
          fi

      - name: An Gitea Container Registry anmelden
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ secrets.REGISTRY_USER || github.repository_owner }}
          password: ${{ secrets.REGISTRY_TOKEN }}

      - name: Metadaten (Tags & Labels) bestimmen
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=semver,pattern={{major}}
            type=sha,format=short
            type=raw,value=latest,enable=${{ startsWith(github.ref, 'refs/tags/') }}

      - name: Image bauen & pushen
        uses: docker/build-push-action@v6
        with:
          context: .
          file: ./Dockerfile
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}