# =============================================================================
# KONSOLIDIERTER BUILD-WORKFLOW (experimentell)
# -----------------------------------------------------------------------------
# Führt die beiden bisherigen Workflows zusammen:
#   - build.yml:         Buildx direkt in die Registry (fragiler
#                        go-zstd-chunked-Workaround, kein --recursive beim Signieren)
#   - redhat_build.yml:  OCI-Export + Skopeo-Recompress zu zstd:chunked +
#                        rekursives Legacy-Signieren (der verlässlichere Weg)
#
# Ablauf hier: Buildx -> OCI-Archiv -> Skopeo-Push mit zstd:chunked ->
#              rekursives Cosign-Signieren im Legacy-Format (.sig, für
#              sigstoreSigned in policy.json erforderlich).
#
# FALLBACK: build.yml und redhat_build.yml bleiben unverändert bestehen.
# Dieser Workflow startet NUR manuell (workflow_dispatch), damit du ihn in
# Ruhe testen kannst. Zur Übernahme:
#   1. Diesen Workflow per workflow_dispatch auf main testen.
#   2. Bei Erfolg: `on:`-Trigger (schedule/pull_request) von build.yml
#      hierher übernehmen und build.yml + redhat_build.yml löschen
#      (oder per `on: workflow_dispatch` als manuellen Fallback behalten).
# =============================================================================
name: Build container image v2 (consolidated)

on:
  workflow_dispatch:

env:
  IMAGE_DESC: "Custom Fedora bootc image"
  IMAGE_NAME: "${{ github.event.repository.name }}"
  DEFAULT_TAG: "stable"

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:

      # ------------------------------------------------------------
      # Environment
      # ------------------------------------------------------------

      - name: Prepare environment
        run: |
          set -euo pipefail

          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}"

          echo "DATE_TAG=$(date -u +'%Y%m%d')" >> "${GITHUB_ENV}"
          echo "BUILD_DATE_ISO=$(date -u +'%Y-%m-%dT%H:%M:%SZ')" >> "${GITHUB_ENV}"

      # ------------------------------------------------------------
      # Image tag
      # ------------------------------------------------------------

      - name: Determine image tag
        run: |
          set -euo pipefail

          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

      # ------------------------------------------------------------
      # Checkout
      # ------------------------------------------------------------

      - name: Checkout
        uses: actions/checkout@v7.0.1

      # ------------------------------------------------------------
      # Registry-Auth für den Build-Kontext (Containerfile kopiert
      # configs/auth.json ins Image, Datei liegt nur als Template im Repo)
      # ------------------------------------------------------------

      - name: Prepare Registry Auth File
        env:
          AUTH_BASE64: ${{ secrets.READONLY_AUTH_BASE64 }}
        run: |
          set -euo pipefail

          sed "s|READONLY_TOKEN_PLACEHOLDER|${AUTH_BASE64}|g" \
            configs/auth.json.template > configs/auth.json

      # ------------------------------------------------------------
      # Buildx
      # ------------------------------------------------------------

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v4.4.1

      # ------------------------------------------------------------
      # Image metadata
      # ------------------------------------------------------------

      - name: Image Metadata
        id: metadata
        uses: docker/metadata-action@v6.2.0
        with:
          images: ${{ env.IMAGE_REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            type=raw,value=${{ env.IMAGE_TAG }}
            type=raw,value=${{ env.IMAGE_TAG }}.${{ env.DATE_TAG }},enable=${{ env.IS_TEST_BUILD == 'false' }}
            type=raw,value=${{ env.DATE_TAG }},enable=${{ env.IS_TEST_BUILD == 'false' }}
            type=sha,enable=${{ github.event_name == 'pull_request' }}
            type=ref,event=pr
          labels: |
            org.opencontainers.image.created=${{ env.BUILD_DATE_ISO }}
            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 }}.${{ env.DATE_TAG }}
            containers.bootc=1
            ostree.bootable=1

      # ------------------------------------------------------------
      # Registry login
      # ------------------------------------------------------------

      - name: Login to Gitea Container Registry
        if: github.event_name != 'pull_request'
        uses: docker/login-action@v4.6.0
        with:
          registry: ${{ env.REGISTRY_HOST }}
          username: ${{ github.repository_owner }}
          password: ${{ secrets.REGISTRY }}

      # ------------------------------------------------------------
      # Prepare OCI output
      # ------------------------------------------------------------

      - name: Prepare OCI archive
        run: |
          rm -rf "${{ github.workspace }}/oci-layout.tar"

      # ------------------------------------------------------------
      # Build image (kein direkter Push: garantiertes zstd:chunked
      # kommt im nächsten Schritt via Skopeo)
      # ------------------------------------------------------------

      - name: Build Image (Docker Buildx OCI-Export)
        uses: docker/build-push-action@v7.4.0
        id: build_image
        with:
          context: .
          file: ./Containerfile

          push: false
          pull: true

          tags: ${{ steps.metadata.outputs.tags }}
          labels: ${{ steps.metadata.outputs.labels }}

          cache-from: type=registry,ref=${{ env.IMAGE_REGISTRY }}/${{ env.IMAGE_NAME }}:buildcache-amd64-main
          cache-to: type=registry,ref=${{ env.IMAGE_REGISTRY }}/${{ env.IMAGE_NAME }}:buildcache-amd64-main,mode=max

          outputs: type=oci,dest=${{ github.workspace }}/oci-layout.tar,tar=true

      # ------------------------------------------------------------
      # Inspect OCI archive
      # ------------------------------------------------------------

      - name: Inspect OCI archive
        if: github.event_name != 'pull_request'
        run: |
          set -euo pipefail

          echo "OCI archive:"
          ls -lh "${{ github.workspace }}/oci-layout.tar"

          echo
          echo "OCI index.json:"
          tar -xf "${{ github.workspace }}/oci-layout.tar" \
            -O index.json | jq .

          echo
          echo "OCI image references:"
          tar -xf "${{ github.workspace }}/oci-layout.tar" \
            -O index.json \
            | jq -r '
                .manifests[]
                | .annotations["org.opencontainers.image.ref.name"] // "(no ref.name)"
              '

      # ------------------------------------------------------------
      # Install Skopeo
      # ------------------------------------------------------------

      - name: Install Skopeo
        if: github.event_name != 'pull_request'
        run: |
          sudo apt-get update
          sudo apt-get install -y skopeo

      # ------------------------------------------------------------
      # Push images via Skopeo (zstd:chunked)
      # ------------------------------------------------------------

      - name: Push Images via Skopeo (zstd:chunked)
        if: github.event_name != 'pull_request'
        run: |
          set -euo pipefail

          OCI_ARCHIVE="${{ github.workspace }}/oci-layout.tar"
          TAGS="${{ steps.metadata.outputs.tags }}"

          echo "Images to push:"
          echo "${TAGS}"

          for DEST_TAG in ${TAGS}; do
            SOURCE_TAG="${DEST_TAG##*:}"

            echo
            echo "============================================================"
            echo "Source OCI tag : ${SOURCE_TAG}"
            echo "Destination     : ${DEST_TAG}"
            echo "============================================================"

            skopeo copy \
              --dest-creds "${{ github.repository_owner }}:${{ secrets.REGISTRY }}" \
              --dest-compress-format zstd:chunked \
              "oci-archive:${OCI_ARCHIVE}:${SOURCE_TAG}" \
              "docker://${DEST_TAG}"
          done

      # ------------------------------------------------------------
      # Install envsubst
      # ------------------------------------------------------------

      - name: Install envsubst dependencies
        if: github.event_name != 'pull_request' && env.IS_TEST_BUILD == 'false'
        run: |
          sudo apt-get update
          sudo apt-get install -y gettext

      # ------------------------------------------------------------
      # Install Cosign
      # ------------------------------------------------------------

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

      # ------------------------------------------------------------
      # Sign image (rekursiv, Legacy-.sig für sigstoreSigned-Policy)
      # ------------------------------------------------------------

      - name: Sign container image (Recursive Digest)
        if: github.event_name != 'pull_request' && env.IS_TEST_BUILD == 'false'
        env:
          COSIGN_PRIVATE_KEY: ${{ secrets.SIGNING_SECRET }}
          COSIGN_PASSWORD: ""
        run: |
          set -euo pipefail

          echo "${{ secrets.REGISTRY }}" \
            | cosign login "${{ env.REGISTRY_HOST }}" \
                -u "${{ github.repository_owner }}" \
                --password-stdin

          echo "Frage finalen Registry-Digest via Skopeo ab..."

          OUTER_DIGEST=$(
            skopeo inspect \
              --creds "${{ github.repository_owner }}:${{ secrets.REGISTRY }}" \
              "docker://${{ env.IMAGE_REGISTRY }}/${{ env.IMAGE_NAME }}:${{ env.DEFAULT_TAG }}" \
              | jq -r .Digest
          )

          echo "Registry digest: ${OUTER_DIGEST}"

          IMAGE_REF="${{ env.IMAGE_REGISTRY }}/${{ env.IMAGE_NAME }}@${OUTER_DIGEST}"

          echo "Signiere Image rekursiv:"
          echo "${IMAGE_REF}"

          cosign sign -y \
            --key env://COSIGN_PRIVATE_KEY \
            --recursive \
            --use-signing-config=false \
            --new-bundle-format=false \
            --registry-referrers-mode=legacy \
            "${IMAGE_REF}"

      # ------------------------------------------------------------
      # Cleanup
      # ------------------------------------------------------------

      - name: Post-Build Cleanup
        if: always()
        run: |
          rm -f configs/auth.json
          rm -f "${{ github.workspace }}/oci-layout.tar"

          docker buildx prune -a -f || true