// Author: fruit.com.cn

import 'package:dio/dio.dart';

import '../config/app_config.dart';

final RegExp _articlePattern = RegExp(
  '<article>([\\s\\S]*)</article>',
  caseSensitive: false,
);

/// 从协议页里取出正文。没有 article 时退回整页。
String legalArticle(String html) {
  final match = _articlePattern.firstMatch(html);
  final body = match?.group(1);
  if (body == null || body.trim().isEmpty) return html;
  return body.trim();
}

/// 拉取协议页 HTML。不走业务 JSON 包装。
Future<String> fetchLegalArticle(String url) async {
  final dio = Dio(
    BaseOptions(
      connectTimeout: AppConfig.requestTimeout,
      receiveTimeout: AppConfig.requestTimeout,
      responseType: ResponseType.plain,
      validateStatus: (code) => code != null && code >= 200 && code < 300,
    ),
  );
  final response = await dio.get<String>(url);
  final body = response.data;
  if (body == null || body.trim().isEmpty) {
    throw StateError('empty legal page');
  }
  return legalArticle(body);
}