name: Docker Build & Push

on:
  push:
    branches: [main]
  workflow_dispatch:

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}

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

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

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

      - name: Login to GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            type=raw,value=latest
            type=sha,prefix=

      - name: Build and push
        uses: docker/build-push-action@v5
        with:
          context: .
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max

  cleanup-old-images:
    runs-on: ubuntu-latest
    needs: build-and-push
    permissions:
      packages: write

    steps:
      - name: Cleanup old images (keep last 4)
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          PACKAGE_NAME=$(echo "${{ github.repository }}" | tr '[:upper:]' '[:lower:]')

          echo "Package: $PACKAGE_NAME"

          # Alle Versions-IDs abrufen, sortiert nach Erstellungsdatum (neueste zuerst)
          VERSION_IDS=$(gh api \
            -H "Accept: application/vnd.github+json" \
            "/user/packages/maven/$PACKAGE_NAME/versions" \
            --paginate \
            -q 'sort_by(.created_at) | reverse | .[].id' 2>/dev/null || \
          gh api \
            -H "Accept: application/vnd.github+json" \
            "/user/packages/container/$PACKAGE_NAME/versions" \
            --paginate \
            -q 'sort_by(.created_at) | reverse | .[].id')

          # In Array umwandeln
          mapfile -t IDS <<< "$VERSION_IDS"
          TOTAL=${#IDS[@]}

          echo "Gefundene Versionen: $TOTAL"

          if [ "$TOTAL" -le 4 ]; then
            echo "Nur $TOTAL Versionen vorhanden, kein Cleanup noetig."
            exit 0
          fi

          # Alle loeschen bis auf die ersten 4
          for ((i=4; i<TOTAL; i++)); do
            VERSION_ID="${IDS[$i]}"
            echo "Loesche Version ID: $VERSION_ID"
            gh api \
              --method DELETE \
              -H "Accept: application/vnd.github+json" \
              "/user/packages/container/$PACKAGE_NAME/versions/$VERSION_ID" || \
            echo "WARNUNG: Konnte Version $VERSION_ID nicht loeschen"
          done

          echo "Cleanup abgeschlossen. $TOTAL -> 4 Versionen behalten."