import 'package:blog_app/models/common.dart';

List<T> convertListResponse<T>(
  dynamic data,
  T Function(Map<String, dynamic>) fromJson,
) {
  if (data is List) {
    return data.map((item) => fromJson(item as Map<String, dynamic>)).toList();
  }
  throw FormatException(
    'Expected a list of items for conversion, but got ${data.runtimeType}',
  );
}

PageResult<T> convertPageResponse<T>(
  dynamic data,
  T Function(Map<String, dynamic>) fromJson,
) {
  if (data is Map<String, dynamic>) {
    return PageResult<T>.fromJson(
      data,
      (json) => fromJson(json as Map<String, dynamic>),
    );
  }
  throw FormatException(
    'Expected a Map for page response conversion, but got ${data.runtimeType}',
  );
}

/// 将数字格式化为中文单位（万/亿）
String formatChineseDecimal(num number, {int decimalPlaces = 2}) {
  if (number < 10000) {
    return number.toString();
  } else if (number < 100000000) {
    // 万单位
    double result = number / 10000.0;
    return '${_formatDecimal(result, decimalPlaces)}万';
  } else {
    // 亿单位
    double result = number / 100000000.0;
    return '${_formatDecimal(result, decimalPlaces)}亿';
  }
}

String _formatDecimal(double number, int decimalPlaces) {
  // 去除末尾的0和小数点
  String formatted = number.toStringAsFixed(decimalPlaces);
  if (formatted.contains('.')) {
    formatted = formatted.replaceAll(RegExp(r'0*$'), '');
    formatted = formatted.replaceAll(RegExp(r'\.$'), '');
  }
  return formatted;
}