ibit-flutter/lib/data/models/copy_trading/copy_position.dart

import '../../../core/utils/avatar_urls.dart';

/// 跟单仓位
class CopyPosition {
  final String id;
  final String symbol;
  final String direction; // 'long' | 'short'
  final String positionType; // '全仓' | '逐仓'
  final int leverage;
  final String traderId;
  final String traderName;
  final String? traderAvatar;
  final double openPrice;
  final double currentPrice;
  final double quantity;
  final double unrealizedPnl;
  final double roi;
  final DateTime openTime;
  final double margin; // 当前保证金 USDT
  final bool isNoLoss; // 是否为无损跟单（L5交易员，跟单员不可手动平仓）
  final double? closePrice; // 平仓均价（历史跟单）
  final DateTime? closeTime; // 平仓时间（历史跟单）

  const CopyPosition({
    required this.id,
    required this.symbol,
    required this.direction,
    required this.positionType,
    required this.leverage,
    required this.traderId,
    required this.traderName,
    this.traderAvatar,
    required this.openPrice,
    required this.currentPrice,
    required this.quantity,
    required this.unrealizedPnl,
    required this.roi,
    required this.openTime,
    this.margin = 0,
    this.isNoLoss = false,
    this.closePrice,
    this.closeTime,
  });

  bool get isLong => direction == 'long';

  /// 从 API FollowOrder Map 构建
  factory CopyPosition.fromApi(Map<String, dynamic> json) {
    double _d(String key) =>
        double.tryParse((json[key] ?? '0').toString()) ?? 0.0;
    int _i(String key) => int.tryParse((json[key] ?? '0').toString()) ?? 0;

    final directionInt = _i('direction');
    final direction = directionInt == 0 ? 'long' : 'short';

    DateTime _fromMs(dynamic ms) {
      if (ms == null) return DateTime.now();
      return DateTime.fromMillisecondsSinceEpoch((ms as num).toInt());
    }

    final closeMs = json['closeTime'];
    final closePriceVal = json['closePrice'];

    return CopyPosition(
      id: json['positionId']?.toString() ?? '',
      symbol: json['symbol']?.toString() ?? '',
      direction: direction,
      positionType: '全仓',
      leverage: _i('leverage'),
      traderId: json['traderId']?.toString() ?? '',
      traderName: json['traderNickname']?.toString() ?? '',
      traderAvatar: normalizeAvatarHttpUrl(json['traderAvatar']?.toString() ??
          json['avatar']?.toString() ??
          json['headImg']?.toString()),
      openPrice: _d('openPrice'),
      currentPrice: _d('currentPrice'),
      quantity: _d('totalPosition'),
      unrealizedPnl: _d('profit'),
      roi: _d('profitRate'),
      openTime: _fromMs(json['openTime']),
      margin: _d('principalAmount'),
      isNoLoss: json['specialTrader'] == true,
      closePrice: closePriceVal != null
          ? double.tryParse(closePriceVal.toString())
          : null,
      closeTime: closeMs != null ? _fromMs(closeMs) : null,
    );
  }
}