name: Release

on:
  push:
    tags:
      - 'v*'

jobs:
  release:
    runs-on: ubuntu-latest
    permissions:
      contents: write
      packages: write
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
          token: ${{ secrets.GITHUB_TOKEN }}

      - name: Check if release is already finalized
        run: |
          VERSION=${GITHUB_REF_NAME#v}
          TARBALL_URL="https://github.com/${{ github.repository }}/releases/download/${GITHUB_REF_NAME}/headlamp-polaris-plugin-${VERSION}.tar.gz"
          HTTP_CODE=$(curl -sL -o /tmp/release.tar.gz -w "%{http_code}" "$TARBALL_URL" 2>/dev/null)
          if [ "$HTTP_CODE" = "200" ]; then
            ACTUAL="sha256:$(sha256sum /tmp/release.tar.gz | awk '{print $1}')"
            EXPECTED=$(grep 'archive-checksum' artifacthub-pkg.yml | awk '{print $2}')
            echo "Release tarball checksum: $ACTUAL"
            echo "Metadata checksum:        $EXPECTED"
            if [ "$ACTUAL" = "$EXPECTED" ]; then
              echo "SKIP_BUILD=true" >> $GITHUB_ENV
              echo "Checksums match - release is finalized, nothing to do"
            fi
          else
            echo "No existing release (HTTP $HTTP_CODE) - will build"
          fi
          rm -f /tmp/release.tar.gz

      - name: Setup Node.js
        if: env.SKIP_BUILD != 'true'
        uses: actions/setup-node@v4
        with:
          node-version: '20'

      - name: Install dependencies
        if: env.SKIP_BUILD != 'true'
        run: npm ci

      - name: Build plugin
        if: env.SKIP_BUILD != 'true'
        run: npx @kinvolk/headlamp-plugin build

      - name: Package tarball
        if: env.SKIP_BUILD != 'true'
        run: npx @kinvolk/headlamp-plugin package

      - name: Compute tarball checksum
        if: env.SKIP_BUILD != 'true'
        run: |
          TARBALL=$(ls *.tar.gz)
          CHECKSUM=$(sha256sum "$TARBALL" | awk '{print $1}')
          echo "TARBALL=$TARBALL" >> $GITHUB_ENV
          echo "CHECKSUM=$CHECKSUM" >> $GITHUB_ENV
          echo "Tarball: $TARBALL"
          echo "Checksum: sha256:$CHECKSUM"

      - name: Create GitHub release and upload tarball
        if: env.SKIP_BUILD != 'true'
        uses: softprops/action-gh-release@v1
        with:
          files: ${{ env.TARBALL }}
          fail_on_unmatched_files: true
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - name: Update metadata and align tag
        if: env.SKIP_BUILD != 'true'
        run: |
          VERSION=${GITHUB_REF_NAME#v}
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"

          # Update metadata
          git fetch origin main
          git checkout origin/main -B temp-update
          sed -i "s|headlamp/plugin/archive-checksum:.*|headlamp/plugin/archive-checksum: sha256:${CHECKSUM}|" artifacthub-pkg.yml
          sed -i "s|headlamp/plugin/archive-url:.*|headlamp/plugin/archive-url: \"https://github.com/${{ github.repository }}/releases/download/${GITHUB_REF_NAME}/headlamp-polaris-plugin-${VERSION}.tar.gz\"|" artifacthub-pkg.yml
          sed -i "s|^version:.*|version: ${VERSION}|" artifacthub-pkg.yml
          git add artifacthub-pkg.yml

          if ! git diff --cached --quiet; then
            git commit -m "ci: update artifact hub metadata for ${GITHUB_REF_NAME}"
            git push origin temp-update:main
          fi

          # Force-move tag to the commit with correct checksum.
          # This triggers a new CI run, but the guard step will detect
          # that the release checksum already matches and skip the build.
          git tag -f ${GITHUB_REF_NAME}
          git push -f origin ${GITHUB_REF_NAME}
          echo "Tag ${GITHUB_REF_NAME} aligned with updated metadata"