name: Documentation

on:
  release:
    types: [published]

permissions:
  contents: write

jobs:
  deploy:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v6
        with:
          fetch-depth: 0

      - name: Install uv
        uses: astral-sh/setup-uv@v7

      - name: Set up Python
        run: uv python install 3.13

      - run: uv sync --group dev

      - name: Configure git
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"

      - name: Deploy documentation
        run: |
          VERSION=${GITHUB_REF_NAME#v}
          MAJOR=$(echo "$VERSION" | cut -d. -f1)
          DEPLOY_VERSION="v$(echo "$VERSION" | cut -d. -f1-2)"

          # On new major: consolidate previous major's feature versions into vX
          PREV_MAJOR=$((MAJOR - 1))
          OLD_FEATURE_VERSIONS=$(uv run mike list 2>/dev/null | grep -oE "^v${PREV_MAJOR}\.[0-9]+" || true)

          if [ -n "$OLD_FEATURE_VERSIONS" ]; then
            LATEST_PREV_TAG=$(git tag -l "v${PREV_MAJOR}.*" | sort -V | tail -1)

            if [ -n "$LATEST_PREV_TAG" ]; then
              git checkout "$LATEST_PREV_TAG" -- docs/ src/ zensical.toml
              if ! grep -q '\[project\.extra\.version\]' zensical.toml; then
                printf '\n[project.extra.version]\nprovider = "mike"\ndefault = "stable"\nalias = true\n' >> zensical.toml
              fi
              uv run mike deploy "v${PREV_MAJOR}"
              git checkout HEAD -- docs/ src/ zensical.toml
            fi

            # Delete old feature versions
            echo "$OLD_FEATURE_VERSIONS" | while read -r OLD_V; do
              echo "Deleting $OLD_V"
              uv run mike delete "$OLD_V"
            done
          fi

          uv run mike deploy --update-aliases "$DEPLOY_VERSION" stable
          uv run mike set-default stable
          git push origin gh-pages