# VDO.Ninja Docker - Daily Build
# Prüft täglich um 20:00 Uhr (MESZ) auf Updates und baut ein neues Docker Image
# Quelle: https://github.com/steveseguin/vdo.ninja

name: Daily Docker Build

on:
  schedule:
    # 18:00 UTC = 20:00 MESZ (Sommerzeit) / 19:00 MEZ (Winterzeit)
    - cron: '0 18 * * *'
  workflow_dispatch:

env:
  IMAGE_NAME: vdo-ninja
  UPSTREAM_REPO: https://github.com/steveseguin/vdo.ninja

jobs:
  check-and-build:
    name: Update-Check & Build
    runs-on: ubuntu-latest

    steps:
      - name: Checkout Repository
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Auf VDO.Ninja Updates prüfen
        id: check
        run: |
          # Neuesten Versions-Tag vom Upstream ermitteln (z.B. v29.0)
          UPSTREAM_TAG=$(git ls-remote --tags --sort=-v:refname ${{ env.UPSTREAM_REPO }} 'v*' | head -n1 | sed 's/.*refs\/tags\///' | sed 's/\^{}//')
          if [ -z "$UPSTREAM_TAG" ]; then
            echo "::error::Kein Versions-Tag im Upstream-Repo gefunden."
            exit 1
          fi
          echo "upstream_tag=${UPSTREAM_TAG}" >> "$GITHUB_OUTPUT"

          # Registry-URL bereinigen (Protokoll entfernen)
          REGISTRY="${{ vars.REGISTRY_URL }}"
          REGISTRY="${REGISTRY#https://}"
          REGISTRY="${REGISTRY#http://}"
          echo "registry=${REGISTRY}" >> "$GITHUB_OUTPUT"

          # Prüfen ob ein Image mit diesem Versions-Tag bereits existiert
          HTTP_CODE=$(curl -s -o /dev/null -w "%{http_code}" \
            -u "${{ secrets.REGISTRY_USER }}:${{ secrets.REGISTRY_TOKEN }}" \
            "${{ vars.REGISTRY_URL }}/v2/${{ secrets.REGISTRY_USER }}/${{ env.IMAGE_NAME }}/manifests/${UPSTREAM_TAG}" \
            -H "Accept: application/vnd.docker.distribution.manifest.v2+json" 2>/dev/null || echo "000")

          if [ "$HTTP_CODE" = "200" ] && [ "${{ github.event_name }}" != "workflow_dispatch" ]; then
            echo "Image mit Version ${UPSTREAM_TAG} existiert bereits. Build wird übersprungen."
            echo "should_build=false" >> "$GITHUB_OUTPUT"
          else
            echo "Neue Version ${UPSTREAM_TAG} erkannt. Image wird gebaut."
            echo "should_build=true" >> "$GITHUB_OUTPUT"
          fi

      - name: Bei Gitea Registry einloggen
        if: steps.check.outputs.should_build == 'true'
        run: |
          echo "${{ secrets.REGISTRY_TOKEN }}" | \
            docker login ${{ steps.check.outputs.registry }} \
              --username "${{ secrets.REGISTRY_USER }}" \
              --password-stdin

      - name: Docker Image bauen
        if: steps.check.outputs.should_build == 'true'
        run: |
          docker buildx build \
            --provenance=false \
            --sbom=false \
            --build-arg VDO_NINJA_REPO=${{ env.UPSTREAM_REPO }} \
            --build-arg VDO_NINJA_REF=${{ steps.check.outputs.upstream_tag }} \
            -t ${{ steps.check.outputs.registry }}/${{ secrets.REGISTRY_USER }}/${{ env.IMAGE_NAME }}:latest \
            -t ${{ steps.check.outputs.registry }}/${{ secrets.REGISTRY_USER }}/${{ env.IMAGE_NAME }}:${{ steps.check.outputs.upstream_tag }} \
            --push \
            .

      - name: Build-Zusammenfassung
        if: always()
        run: |
          if [ "${{ steps.check.outputs.should_build }}" = "true" ]; then
            echo "### Docker Build Zusammenfassung" >> $GITHUB_STEP_SUMMARY
            echo "" >> $GITHUB_STEP_SUMMARY
            echo "| Eigenschaft | Wert |" >> $GITHUB_STEP_SUMMARY
            echo "|---|---|" >> $GITHUB_STEP_SUMMARY
            echo "| **Image** | \`${{ env.IMAGE_NAME }}\` |" >> $GITHUB_STEP_SUMMARY
            echo "| **VDO.Ninja Version** | \`${{ steps.check.outputs.upstream_tag }}\` |" >> $GITHUB_STEP_SUMMARY
            echo "| **Tags** | \`latest\`, \`${{ steps.check.outputs.upstream_tag }}\` |" >> $GITHUB_STEP_SUMMARY
          else
            echo "### Kein Update erforderlich" >> $GITHUB_STEP_SUMMARY
            echo "" >> $GITHUB_STEP_SUMMARY
            echo "VDO.Ninja Version \`${{ steps.check.outputs.upstream_tag }}\` ist bereits als Image vorhanden." >> $GITHUB_STEP_SUMMARY
          fi