name: Nightly source release

# Publishes the current head of `master` as a rolling `nightly` pre-release
# with a full source archive attached. No per-OS builds run here -- this is a
# source snapshot only. The reason it exists rather than pointing people at
# GitHub's auto-generated "Source code (zip)": those archives omit submodules,
# and a psxrecomp tree without lib/recomp-net and lib/retcomm-rbengine does not
# configure.
#
# Behaviour:
#   * Runs nightly (and on demand via workflow_dispatch).
#   * If `master` has not moved since the last nightly, it does nothing.
#   * The `nightly` tag and release are replaced each run, so there is exactly
#     one nightly at a time and it never displaces the versioned "Latest".
#   * Creating the release with GITHUB_TOKEN does not fire other workflows,
#     so cli-release.yml (release: published) is NOT triggered by this.
on:
  schedule:
    - cron: "17 6 * * *"   # 06:17 UTC daily
  workflow_dispatch:

permissions:
  contents: write

concurrency:
  group: nightly-source-release
  cancel-in-progress: false

env:
  NIGHTLY_TAG: nightly

jobs:
  publish:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v6
        with:
          ref: master
          submodules: recursive
          fetch-depth: 0
          fetch-tags: true

      - name: Compare with previous nightly
        id: prev
        run: |
          head=$(git rev-parse HEAD)
          prev=$(git rev-parse -q --verify "refs/tags/$NIGHTLY_TAG^{commit}" || true)
          echo "head=$head" >> "$GITHUB_OUTPUT"
          echo "prev=$prev" >> "$GITHUB_OUTPUT"
          if [ -n "$prev" ] && [ "$prev" = "$head" ] && [ "$GITHUB_EVENT_NAME" = "schedule" ]; then
            echo "master ($head) unchanged since last nightly; nothing to publish."
            echo "changed=false" >> "$GITHUB_OUTPUT"
          else
            echo "changed=true" >> "$GITHUB_OUTPUT"
          fi

      - name: Build source archives
        if: steps.prev.outputs.changed == 'true'
        id: archive
        run: |
          set -euo pipefail
          date=$(date -u +%Y%m%d)
          short=$(git rev-parse --short=10 HEAD)
          name="psxrecomp-src-nightly-${date}-${short}"
          stage="$RUNNER_TEMP/$name"
          mkdir -p "$stage"
          # Tracked files only, submodules included, no .git directories.
          git ls-files -z --recurse-submodules | xargs -0 cp --parents -t "$stage"
          printf '%s\n' "$(git rev-parse HEAD)" > "$stage/NIGHTLY_COMMIT"
          git submodule status --recursive > "$stage/NIGHTLY_SUBMODULES"
          mkdir -p dist
          tar -C "$RUNNER_TEMP" -czf "dist/$name.tar.gz" "$name"
          (cd "$RUNNER_TEMP" && zip -q -r "$GITHUB_WORKSPACE/dist/$name.zip" "$name")
          (cd dist && sha256sum "$name.tar.gz" "$name.zip" > SHA256SUMS)
          ls -l dist
          echo "name=$name" >> "$GITHUB_OUTPUT"
          echo "date=$date" >> "$GITHUB_OUTPUT"
          echo "short=$short" >> "$GITHUB_OUTPUT"

      - name: Write release notes
        if: steps.prev.outputs.changed == 'true'
        env:
          PREV: ${{ steps.prev.outputs.prev }}
          HEAD_SHA: ${{ steps.prev.outputs.head }}
        run: |
          set -euo pipefail
          {
            echo "Automated nightly source snapshot of \`master\` at ${HEAD_SHA}."
            echo
            echo "The attached archives contain the full tree **including submodules**"
            echo "(\`lib/recomp-net\`, \`lib/retcomm-rbengine\`), which GitHub's auto-generated"
            echo "source archives leave out. Set up a game project from it with the"
            echo "scripts in \`tools/new_project_layout/\` -- see \`docs/GAME_PROJECT_SETUP.md\`."
            echo
            echo "This tag moves every night; do not pin to it."
            echo
            if [ -n "$PREV" ] && git cat-file -e "$PREV^{commit}" 2>/dev/null; then
              echo "### Changes since previous nightly (${PREV})"
              echo
              git log --no-merges --format='- %h %s' "$PREV..HEAD" | head -200
              n=$(git rev-list --count --no-merges "$PREV..HEAD")
              if [ "$n" -gt 200 ]; then echo "- ... and $((n-200)) more"; fi
            else
              echo "### Changes"
              echo
              echo "First nightly, or previous nightly commit no longer reachable."
            fi
          } > notes.md
          cat notes.md

      - name: Replace nightly release
        if: steps.prev.outputs.changed == 'true'
        env:
          GH_TOKEN: ${{ github.token }}
          HEAD_SHA: ${{ steps.prev.outputs.head }}
          TITLE: "Nightly ${{ steps.archive.outputs.date }} (${{ steps.archive.outputs.short }})"
        run: |
          set -euo pipefail
          gh release delete "$NIGHTLY_TAG" --repo "$GITHUB_REPOSITORY" --cleanup-tag --yes || true
          gh release create "$NIGHTLY_TAG" \
            --repo "$GITHUB_REPOSITORY" \
            --target "$HEAD_SHA" \
            --title "$TITLE" \
            --notes-file notes.md \
            --prerelease --latest=false \
            dist/*.tar.gz dist/*.zip dist/SHA256SUMS