name: "Check QLdoc coverage"

on:
  pull_request:
    paths:
      - "*/ql/lib/**"
      - .github/workflows/check-qldoc.yml
      - .github/actions/fetch-codeql/action.yml
    branches:
      - main
      - "rc/*"

permissions:
  contents: read

jobs:
  qldoc:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 2

      - name: Install CodeQL
        uses: ./.github/actions/fetch-codeql

      - name: Check QLdoc coverage
        shell: bash
        run: |
          EXIT_CODE=0
          # TODO: remove the shared exception from the regex when coverage of qlpacks without dbschemes is supported
          # TODO: remove the actions exception once https://github.com/github/codeql-team/issues/3656 is fixed
          changed_lib_packs="$(git diff --name-only --diff-filter=ACMRT HEAD^ HEAD | { grep -Po '^(?!(shared|actions))[a-z]*/ql/lib' || true; } | sort -u)"
          for pack_dir in ${changed_lib_packs}; do
            lang="${pack_dir%/ql/lib}"
            codeql generate library-doc-coverage --output="${RUNNER_TEMP}/${lang}-current.txt" --dir="${pack_dir}"
          done
          git checkout HEAD^
          for pack_dir in ${changed_lib_packs}; do
            # When we add a new language, pack_dir would not exist in HEAD^.
            # In this case the right thing to do is to skip the check.
            [[ ! -d "${pack_dir}" ]] && continue
            lang="${pack_dir%/ql/lib}"
            codeql generate library-doc-coverage --output="${RUNNER_TEMP}/${lang}-baseline.txt" --dir="${pack_dir}"
            awk -F, '{gsub(/"/,""); if ($4==0 && $6=="public") print "\""$3"\"" }' "${RUNNER_TEMP}/${lang}-current.txt" | sort -u > "${RUNNER_TEMP}/current-undocumented.txt"
            awk -F, '{gsub(/"/,""); if ($4==0 && $6=="public") print "\""$3"\"" }' "${RUNNER_TEMP}/${lang}-baseline.txt" | sort -u > "${RUNNER_TEMP}/baseline-undocumented.txt"
            UNDOCUMENTED="$(grep -f <(comm -13 "${RUNNER_TEMP}/baseline-undocumented.txt" "${RUNNER_TEMP}/current-undocumented.txt") "${RUNNER_TEMP}/${lang}-current.txt" || true)"
            if [ -n "$UNDOCUMENTED" ]; then
              echo "$UNDOCUMENTED" | awk -F, '{gsub(/"/,""); print "::warning file='"${pack_dir}"'/"$1",line="$2"::Missing QLdoc for "$5, $3 }'
              EXIT_CODE=1
            fi
          done
          exit "${EXIT_CODE}"