name: List unused GitHub Packages versions

on:
  workflow_dispatch:

permissions:
  contents: read
  packages: read

jobs:
  list-zero-downloads:
    runs-on: ubuntu-latest

    steps:
      - name: List zero-download NuGet package versions
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          PACKAGE_OWNER: ${{ github.repository_owner }}
        shell: bash
        run: |
          result="$(gh api graphql \
            -f query='query($owner: String!) {
              user(login: $owner) {
                packages(first: 100, packageType: NUGET) {
                  nodes {
                    name
                    versions(first: 100) {
                      nodes {
                        version
                        statistics { downloadsTotalCount }
                      }
                    }
                  }
                }
              }
            }' \
            -f owner="$PACKAGE_OWNER")"

          matches="$(printf '%s' "$result" | jq -r '
            .data.user.packages.nodes[]
            | .name as $package
            | .versions.nodes[]
            | select(.statistics != null and .statistics.downloadsTotalCount == 0)
            | "\($package) \(.version)"')"

          if [[ -z "$matches" ]]; then
            echo "No zero-download NuGet package versions found."
            exit 0
          fi

          echo "Zero-download NuGet package versions:"
          echo "$matches"