name: Build container image

on:
  pull_request:
    branches:
      - main
  schedule:
    - cron: '05 12 * * 2,5'
  workflow_dispatch:

env:
  IMAGE_DESC: "Custom Fedora bootc image"
  IMAGE_NAME: "${{ github.event.repository.name }}"
  DEFAULT_TAG: "stable"
  # Erzwingt die Verwendung von Node 24 für alle JavaScript-Actions
  FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: "true"

concurrency:
  group: ${{ github.workflow }}-${{ github.ref || github.run_id }}
  cancel-in-progress: true

jobs:
  build_push:
    name: Build and push image
    runs-on: ubuntu-24.04
    permissions:
      contents: read
      packages: write
      id-token: write
    steps:
      - name: Prepare environment
        run: |
          REGISTRY_HOST=$(echo "${{ github.server_url }}" | awk -F/ '{print $3}')
          OWNER_LOWER="${{ github.repository_owner }}"
          NAME_LOWER="${{ env.IMAGE_NAME }}"
          echo "REGISTRY_HOST=${REGISTRY_HOST}" >> ${GITHUB_ENV}
          echo "IMAGE_REGISTRY=${REGISTRY_HOST}/${OWNER_LOWER,,}" >> ${GITHUB_ENV}
          echo "IMAGE_NAME=${NAME_LOWER,,}" >> ${GITHUB_ENV}

      - name: Install Buildah
        run: |
          sudo apt-get update
          sudo apt-get install -y buildah

      - name: Checkout
        uses: actions/checkout@v4

      - name: Determine image tag
        run: |
          BRANCH="${GITHUB_REF_NAME}"
          if [[ "$BRANCH" == "main" ]]; then
            echo "IMAGE_TAG=${DEFAULT_TAG}" >> ${GITHUB_ENV}
            echo "IS_TEST_BUILD=false" >> ${GITHUB_ENV}
          else
            SANITIZED=$(echo "$BRANCH" | sed 's/[^a-zA-Z0-9._-]/-/g' | head -c 50)
            echo "IMAGE_TAG=test-${SANITIZED}" >> ${GITHUB_ENV}
            echo "IS_TEST_BUILD=true" >> ${GITHUB_ENV}
          fi

      - name: Generate Tags
        id: generate_tags
        run: |
          TAGS="${{ env.IMAGE_TAG }}"
          if [[ "${{ env.IS_TEST_BUILD }}" == "false" ]]; then
            DATE_TAG=$(date +'%Y%m%d')
            TAGS="${TAGS} ${{ env.IMAGE_TAG }}.${DATE_TAG} ${DATE_TAG}"
          fi
          if [[ "${{ github.event_name }}" == "pull_request" ]]; then
            TAGS="pr-${{ github.event.pull_request.number }} sha-${GITHUB_SHA::7}"
          fi
          echo "tags=${TAGS}" >> $GITHUB_OUTPUT

      - name: Image Metadata
        id: metadata
        uses: docker/metadata-action@v6
        with:
          images: ${{ env.IMAGE_REGISTRY }}/${{ env.IMAGE_NAME }}
          labels: |
            org.opencontainers.image.created={{date 'YYYY-MM-DDTHH:mm:ssZ'}}
            org.opencontainers.image.description=${{ env.IMAGE_DESC }}
            org.opencontainers.image.documentation=${{ github.server_url }}/${{ github.repository }}
            org.opencontainers.image.source=${{ github.server_url }}/${{ github.repository }}
            org.opencontainers.image.title=${{ env.IMAGE_NAME }}
            org.opencontainers.image.url=${{ github.server_url }}/${{ github.repository }}
            org.opencontainers.image.vendor=${{ github.repository_owner }}
            org.opencontainers.image.version=${{ env.IMAGE_TAG }}.{{date 'YYYYMMDD'}}
            containers.bootc=1
            ostree.bootable=1

      - name: Build Image (Buildah)
        id: build_image
        uses: redhat-actions/buildah-build@v2
        with:
          context: .
          containerfiles: ./Containerfile
          image: ${{ env.IMAGE_REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: ${{ steps.generate_tags.outputs.tags }}
          labels: ${{ steps.metadata.outputs.labels }}
          oci: true

      - name: Push to Registry
        id: push_image
        if: github.event_name != 'pull_request'
        uses: redhat-actions/push-to-registry@v2
        with:
          image: ${{ steps.build_image.outputs.image }}
          tags: ${{ steps.build_image.outputs.tags }}
          registry: ${{ env.REGISTRY_HOST }}
          username: ${{ github.repository_owner }}
          password: ${{ secrets.REGISTRY }}

      - name: Install Cosign
        if: github.event_name != 'pull_request' && env.IS_TEST_BUILD == 'false'
        uses: sigstore/cosign-installer@v4.1.2

      - name: Sign container image (Pure Digest)
        if: github.event_name != 'pull_request' && env.IS_TEST_BUILD == 'false'
        env:
          COSIGN_PRIVATE_KEY: ${{ secrets.SIGNING_SECRET }}
          COSIGN_PASSWORD: ""
        run: |
          echo "${{ secrets.REGISTRY }}" | cosign login "${{ env.REGISTRY_HOST }}" -u "${{ github.repository_owner }}" --password-stdin
          DIGEST="${{ steps.push_image.outputs.digest }}"
          IMAGE_REF="${{ env.IMAGE_REGISTRY }}/${{ env.IMAGE_NAME }}@${DIGEST}"
          echo "Signiere exklusiv via Digest: ${IMAGE_REF}"
          cosign sign -y \
            --key env://COSIGN_PRIVATE_KEY \
            --use-signing-config=false \
            --new-bundle-format=false \
            --tlog-upload=false \
            --registry-referrers-mode=legacy \
            "${IMAGE_REF}"

      - name: Post-Build Cleanup
        if: always()
        run: |
          echo "Führe Smart Cleanup durch..."
          buildah rm $(buildah containers -q) >/dev/null 2>&1 || true
          buildah rmi $(buildah images -f "dangling=true" -q) >/dev/null 2>&1 || true
          echo "Speicherplatz bereinigt."