// 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 'package:analyzer/src/lint/config.dart'; // ignore: implementation_imports
import 'package:http/http.dart' as http;

const _pedanticOptionsRootUrl =
    'https://raw.githubusercontent.com/dart-lang/pedantic/master/lib';
const _pedanticOptionsUrl = '$_pedanticOptionsRootUrl/analysis_options.yaml';

List<String> _pedanticRules;
Future<List<String>> get pedanticRules async =>
    _pedanticRules ??= await _fetchPedanticRules();

Future<List<String>> fetchRules(String optionsUrl) async {
  final config = await _fetchConfig(optionsUrl);
  if (config == null) {
    print('no config found for: $optionsUrl (SKIPPED)');
    return <String>[];
  }
  final rules = <String>[];
  for (var ruleConfig in config.ruleConfigs) {
    rules.add(ruleConfig.name);
  }
  return rules;
}

Future<LintConfig> _fetchConfig(String url) async {
  final client = http.Client();
  final req = await client.get(url);
  return processAnalysisOptionsFile(req.body);
}

Future<List<String>> _fetchPedanticRules() async {
  final client = http.Client();
  final req = await client.get(_pedanticOptionsUrl);
  final includedOptions =
      req.body.split('include: package:pedantic/')[1].trim();
  return fetchRules('$_pedanticOptionsRootUrl/$includedOptions');
}