name: Generate and publish developer Wiki

on:
  pull_request:
  push:
    branches: [main]
  workflow_dispatch:

concurrency:
  group: openunifi-wiki
  cancel-in-progress: false

permissions:
  code: read

jobs:
  validate-wiki:
    runs-on: ubuntu-latest
    steps:
      - name: Check out source repository
        uses: actions/checkout@v4
        with:
          fetch-depth: 2
          path: source
      - name: Check patch whitespace
        run: git -C source diff --check HEAD^ HEAD
      - name: Validate documentation generator
        run: |
          mkdir -p "$RUNNER_TEMP/openuf-wiki"
          python3 source/scripts/docs/generate-wiki.py --output "$RUNNER_TEMP/openuf-wiki"
          python3 source/scripts/docs/generate-wiki.py --check --output "$RUNNER_TEMP/openuf-wiki"

  publish-wiki:
    if: gitea.event_name != 'pull_request'
    needs: validate-wiki
    runs-on: ubuntu-latest
    permissions:
      code: read
      wiki: write
    steps:
      - name: Check out source repository
        uses: actions/checkout@v4
        with:
          path: source
      - name: Clone Wiki Git repository
        env:
          GITEA_REPOSITORY: ${{ gitea.repository }}
          GITEA_SERVER_URL: ${{ gitea.server_url }}
        run: |
          set -eu
          repository_owner=${GITEA_REPOSITORY%%/*}
          repository_name=${GITEA_REPOSITORY##*/}
          wiki_name=$(printf '%s' "$repository_name" | tr '[:upper:]' '[:lower:]')
          wiki_url="${GITEA_SERVER_URL%/}/${repository_owner}/${wiki_name}.wiki.git"
          git clone -- "$wiki_url" wiki
      - name: Generate and verify Gitea Wiki pages
        run: |
          python3 source/scripts/docs/generate-wiki.py --output wiki
          python3 source/scripts/docs/generate-wiki.py --check --output wiki
      - name: Publish changed Wiki pages
        working-directory: wiki
        env:
          GITEA_TOKEN: ${{ secrets.GITEA_TOKEN }}
        run: |
          set -eu
          git config user.name "openUF documentation bot"
          git config user.email "actions@openuf.invalid"
          git add -- Home.md Developer-Guide.md Call-Graph.md Runtime-Flow.md _Sidebar.md
          if git diff --cached --quiet; then
            echo "Gitea Wiki is already current"
            exit 0
          fi
          git commit -m "docs: update generated developer wiki"
          basic_auth=$(printf 'x-access-token:%s' "$GITEA_TOKEN" | base64 | tr -d '\n')
          git -c http.extraHeader="Authorization: Basic $basic_auth" push origin HEAD