# Builds Doxygen XML + HTML in a single pass, runs documentation coverage
# checks on pull requests, and publishes the HTML to GitHub Pages when changes
# land on `develop`.
name: Documentation (build, coverage, publish)

on:
  push:
    branches:
      - "develop"
    paths:
      - ".github/workflows/publish-docs.yml"
      - ".github/doc-coverage-thresholds.json"
      - ".github/scripts/doc-coverage-check.py"
      - "*.md"
      - "**/*.md"
      - "docs/**"
      - "include/**"
      - "src/libxrpl/**"
      - "src/xrpld/**"
  pull_request:
    paths:
      - ".github/workflows/publish-docs.yml"
      - ".github/doc-coverage-thresholds.json"
      - ".github/scripts/doc-coverage-check.py"
      - "*.md"
      - "**/*.md"
      - "docs/**"
      - "include/**"
      - "src/libxrpl/**"
      - "src/xrpld/**"

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

defaults:
  run:
    shell: bash

env:
  BUILD_DIR: build
  # ubuntu-latest has only 2 CPUs for private repositories
  # https://docs.github.com/en/actions/reference/runners/github-hosted-runners#standard-github-hosted-runners-for--private-repositories
  NPROC_SUBTRACT: ${{ github.event.repository.visibility == 'public' && '2' || '1' }}

jobs:
  build:
    runs-on: ubuntu-latest
    container: ghcr.io/xrplf/ci/tools-rippled-documentation:sha-a8c7be1
    permissions:
      pull-requests: write
      contents: read
    steps:
      - name: Checkout repository
        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
        with:
          fetch-depth: 0

      - name: Prepare runner
        uses: XRPLF/actions/prepare-runner@90f11ee655d1687824fb8793db770477d52afbab
        with:
          enable_ccache: false

      - name: Get number of processors
        uses: XRPLF/actions/get-nproc@cf0433aa74563aead044a1e395610c96d65a37cf
        id: nproc
        with:
          subtract: ${{ env.NPROC_SUBTRACT }}

      - name: Install coverxygen
        # TODO: drop pin once upstream fixes the 1.8.x regression.
        # 1.8.2 crashes on enums when no --exclude is configured:
        #   AttributeError: 'str' object has no attribute 'iter'
        #   at coverxygen/__init__.py extract_enum_qualified_name
        run: pip install 'coverxygen<1.8'

      - name: Check configuration
        run: |
          echo 'Checking path.'
          echo ${PATH} | tr ':' '\n'

          echo 'Checking CMake version.'
          cmake --version

          echo 'Checking Doxygen version.'
          doxygen --version

      - name: Build documentation (PR/HEAD)
        env:
          BUILD_NPROC: ${{ steps.nproc.outputs.nproc }}
        run: |
          mkdir -p "${BUILD_DIR}"
          cd "${BUILD_DIR}"
          cmake -Donly_docs=ON ..
          cmake --build . --target docs --parallel ${BUILD_NPROC}

      - name: Determine changed C++ files
        if: github.event_name == 'pull_request'
        id: changed
        uses: tj-actions/changed-files@9426d40962ed5378910ee2e21d5f8c6fcbf2dd96 # v47.0.6
        with:
          files: |
            include/**/*.h
            src/**/*.h
            src/**/*.cpp

      - name: Cache base-branch Doxygen XML
        if: github.event_name == 'pull_request'
        id: base-cache
        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4.3.0
        with:
          path: build-base/docs/xml
          key: doxygen-xml-${{ github.event.pull_request.base.sha }}-${{ hashFiles('docs/Doxyfile') }}

      - name: Build base-branch Doxygen XML (cache miss)
        if: github.event_name == 'pull_request' && steps.base-cache.outputs.cache-hit != 'true'
        env:
          BUILD_NPROC: ${{ steps.nproc.outputs.nproc }}
        run: |
          git checkout ${{ github.event.pull_request.base.sha }}
          mkdir -p build-base
          cd build-base
          if ! cmake -Donly_docs=ON .. > cmake.log 2>&1; then
            echo "::warning::Base-branch cmake configure failed; ratchet disabled for this PR"
            cat cmake.log
          elif ! cmake --build . --target docs --parallel ${BUILD_NPROC} > build.log 2>&1; then
            echo "::warning::Base-branch Doxygen build failed; ratchet disabled for this PR"
            tail -50 build.log
          fi
          cd ..
          git checkout ${{ github.event.pull_request.head.sha }}

      - name: Generate coverage report (PR)
        if: github.event_name == 'pull_request'
        run: |
          python3 -m coverxygen \
            --xml-dir ${BUILD_DIR}/docs/xml \
            --src-dir . \
            --output doc-coverage.info \
            --kind class,struct,function,enum,typedef,variable \
            --scope public

      - name: Generate coverage report (base)
        if: github.event_name == 'pull_request'
        run: |
          if [ -d "build-base/docs/xml" ]; then
            python3 -m coverxygen \
              --xml-dir build-base/docs/xml \
              --src-dir . \
              --output base-doc-coverage.info \
              --kind class,struct,function,enum,typedef,variable \
              --scope public || true
          fi

      - name: Check coverage thresholds
        if: github.event_name == 'pull_request'
        run: |
          BASE_FLAG=""
          if [ -f "base-doc-coverage.info" ]; then
            BASE_FLAG="--base-lcov-file base-doc-coverage.info"
          fi

          NEW_FILES=""
          if [ -n "${{ steps.changed.outputs.added_files }}" ]; then
            NEW_FILES="--new-files ${{ steps.changed.outputs.added_files }}"
          fi

          python3 .github/scripts/doc-coverage-check.py \
            --lcov-file doc-coverage.info \
            --threshold-file .github/doc-coverage-thresholds.json \
            --output doc-coverage-report.md \
            ${BASE_FLAG} \
            ${NEW_FILES} || true

      - name: Post coverage report to PR
        if: github.event_name == 'pull_request' && always()
        uses: marocchino/sticky-pull-request-comment@67d0dec7b07ed060a405f9b2a64b8ab319fdd7db # v2.9.2
        with:
          header: doc-coverage
          path: doc-coverage-report.md

      - name: Create documentation artifact
        if: ${{ github.event.repository.visibility == 'public' && github.event_name == 'push' }}
        uses: actions/upload-pages-artifact@fc324d3547104276b827a68afc52ff2a11cc49c9 # v5.0.0
        with:
          path: ${{ env.BUILD_DIR }}/docs/html

  deploy:
    if: ${{ github.repository == 'XRPLF/rippled' && github.event_name == 'push' }}
    needs: build
    runs-on: ubuntu-latest
    permissions:
      pages: write
      id-token: write
    environment:
      name: github-pages
      url: ${{ steps.deploy.outputs.page_url }}
    steps:
      - name: Deploy to GitHub Pages
        id: deploy
        uses: actions/deploy-pages@cd2ce8fcbc39b97be8ca5fce6e763baed58fa128 # v5.0.0