// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import 'dart:async';

import 'package:analyzer/src/lint/config.dart';
import 'package:http/http.dart' as http;
import 'package:linter/src/utils.dart';
import 'package:yaml/yaml.dart';

Future<List<String>> get dartCoreLints =>
    _fetchRulesFromGitHub('/dart-lang/core/main/pkgs/lints/lib/core.yaml');

Future<List<String>> get dartRecommendedLints => _fetchRulesFromGitHub(
  '/dart-lang/core/main/pkgs/lints/lib/recommended.yaml',
);

Future<List<String>> get flutterUserLints => _fetchRulesFromGitHub(
  '/flutter/packages/main/packages/flutter_lints/lib/flutter.yaml',
);

Future<List<String>> _fetchRulesFromGitHub(String optionsPath) async {
  var optionsUrl = Uri.https('raw.githubusercontent.com', optionsPath);
  var req = await http.get(optionsUrl);

  var optionsYaml = loadYamlNode(req.body);
  if (optionsYaml is! YamlMap) {
    printToConsole('No YAML map found for: $optionsUrl (SKIPPED)');
    return [];
  }

  var ruleConfigs = parseLinterSection(optionsYaml);
  if (ruleConfigs == null) {
    printToConsole('No config found for: $optionsUrl (SKIPPED)');
    return [];
  }
  return ruleConfigs.values.map((r) => r.name).nonNulls.toList(growable: false);
}