name: Publish Documentation

# Renders the markdown docs (docs/*.md) into an mdBook site, builds the Rust
# API reference with cargo doc, and force-pushes the combined output to the
# orphan `gitea-pages` branch that the Gitea Pages server serves.
#
# The published matrix is regenerated during the build, so it is never stale.

on:
  push:
    branches:
      - master

concurrency:
  # Only one docs publish at a time; a newer push supersedes an in-flight run.
  group: publish-docs
  cancel-in-progress: true

jobs:
  publish-docs:
    name: Build & publish docs to gitea-pages
    runs-on: linux/amd64
    container:
      image: gitea.tourolle.paris/dtourolle/jellytau-builder:latest

    steps:
      - name: Checkout code
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      # bun is baked into jellytau-builder (see Dockerfile.builder); no setup-bun
      # action needed — fetching it stalls on this Gitea runner.
      - name: Install dependencies
        run: bun install

      - name: Install mdBook
        run: |
          set -e
          MDBOOK_VERSION=v0.4.40
          URL="https://github.com/rust-lang/mdBook/releases/download/${MDBOOK_VERSION}/mdbook-${MDBOOK_VERSION}-x86_64-unknown-linux-gnu.tar.gz"
          echo "⬇️  Downloading mdBook ${MDBOOK_VERSION}"
          curl -fsSL "$URL" | tar -xz -C /usr/local/bin
          mdbook --version

      - name: Regenerate traceability matrix (keep published copy current)
        run: bun run traces:markdown

      - name: Assemble mdBook sources
        run: |
          set -e
          # mdBook's src is docs/. Drop in the SUMMARY and the generated
          # intro + API redirect pages (build artifacts, not committed).
          cp docs-site/SUMMARY.md docs/SUMMARY.md

          cat > docs/README.md <<'EOF'
          # JellyTau Documentation

          Cross-platform Jellyfin client — business logic in a Rust backend,
          SvelteKit + TypeScript frontend, talking over Tauri v2 IPC.

          - **[Requirements Specification](requirements.md)** — user, integration, and development requirements.
          - **[Traceability Matrix](traceability.md)** — generated map from requirements to code (regenerated on every publish).
          - **[Architecture](architecture/README.md)** — backend, frontend, data flow, platform backends.
          - **[Rust API Reference](api/index.html)** — rustdoc for the `src-tauri` backend.

          _This site is published automatically from `master` by the `publish-docs` CI job._
          EOF

          cat > docs/api-redirect.md <<'EOF'
          # Rust API Reference

          The full backend API reference is generated by `cargo doc` (rustdoc).

          👉 **[Open the Rust API Reference](api/index.html)**
          EOF

      - name: Build mdBook site
        run: mdbook build docs-site --dest-dir "$GITHUB_WORKSPACE/site"

      - name: Build Rust API docs (cargo doc)
        working-directory: src-tauri
        # --no-deps keeps it to our own crate (fast, focused); document private
        # items so internal modules/commands appear.
        run: |
          cargo doc --no-deps --document-private-items
          # The backend modules/commands live in the LIB crate (jellytau_lib);
          # the bin crate (jellytau) is a near-empty shim. Land on the lib.
          echo '<meta http-equiv="refresh" content="0; url=jellytau_lib/index.html">' \
            > target/doc/index.html

      - name: Assemble published output
        run: |
          set -e
          mkdir -p "$GITHUB_WORKSPACE/site/api"
          cp -r src-tauri/target/doc/. "$GITHUB_WORKSPACE/site/api/"
          # Disable Jekyll processing on the pages branch.
          touch "$GITHUB_WORKSPACE/site/.nojekyll"
          ls -la "$GITHUB_WORKSPACE/site"

      - name: Push to gitea-pages branch
        env:
          # PAT preferred; falls back to the auto-provided token (same pattern
          # as build-release.yml).
          GITEA_TOKEN: ${{ secrets.GITEA_TOKEN }}
          AUTO_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          set -e
          TOKEN="${GITEA_TOKEN:-$AUTO_TOKEN}"
          REPO="${GITHUB_REPOSITORY}"
          HOST="$(echo "$GITHUB_SERVER_URL" | sed -E 's#^https?://##')"
          REMOTE="https://oauth2:${TOKEN}@${HOST}/${REPO}.git"

          cd "$GITHUB_WORKSPACE/site"
          git init -q
          git config user.name "gitea-actions"
          git config user.email "actions@gitea.tourolle.paris"
          git checkout -q -b gitea-pages
          git add -A
          # POSIX sh has no ${VAR::N} substring expansion — cut instead.
          SHORT_SHA="$(printf '%s' "$GITHUB_SHA" | cut -c1-8)"
          git commit -q -m "docs: publish site from ${SHORT_SHA}"
          echo "🚀 Force-pushing to gitea-pages"
          git push -f "$REMOTE" gitea-pages