/// K线蜡烛数据模型
class KlineCandle {
  final String coinCode;
  final String interval;
  final int openTime;
  final double openPrice;
  final double highPrice;
  final double lowPrice;
  final double closePrice;
  final double volume;
  final int closeTime;
  final bool isClosed;
  final int? timestamp;

  const KlineCandle({
    required this.coinCode,
    required this.interval,
    required this.openTime,
    required this.openPrice,
    required this.highPrice,
    required this.lowPrice,
    required this.closePrice,
    required this.volume,
    required this.closeTime,
    this.isClosed = true,
    this.timestamp,
  });

  factory KlineCandle.fromJson(Map<String, dynamic> json) {
    return KlineCandle(
      coinCode: json['coinCode'] as String? ?? '',
      interval: json['interval'] as String? ?? '1h',
      openTime: json['openTime'] as int? ?? 0,
      openPrice: _toDouble(json['openPrice']),
      highPrice: _toDouble(json['highPrice']),
      lowPrice: _toDouble(json['lowPrice']),
      closePrice: _toDouble(json['closePrice']),
      volume: _toDouble(json['volume']),
      closeTime: json['closeTime'] as int? ?? 0,
      isClosed: json['isClosed'] as bool? ?? true,
      timestamp: json['timestamp'] as int?,
    );
  }

  static double _toDouble(dynamic v) {
    if (v == null) return 0.0;
    if (v is double) return v;
    if (v is int) return v.toDouble();
    if (v is String) return double.tryParse(v) ?? 0.0;
    return 0.0;
  }

  /// 转换为 k_chart 库的 KLineEntity 格式
  Map<String, dynamic> toKLineEntityMap() {
    return {
      'open': openPrice,
      'high': highPrice,
      'low': lowPrice,
      'close': closePrice,
      'vol': volume,
      'amount': closePrice * volume,
      'time': openTime,
      'id': openTime,
    };
  }

  /// 转换为 k_chart KLineEntity 对象
  dynamic toKLineEntity() {
    // k_chart KLineEntity.fromCustom 构造器
    return null; // placeholder, actual conversion in kline_page
  }

  /// 从 REST API JSON 转换（历史K线）
  factory KlineCandle.fromHistoryJson(Map<String, dynamic> json) {
    return KlineCandle(
      coinCode: json['coinCode'] as String? ?? '',
      interval: json['interval'] as String? ?? '1h',
      openTime: json['openTime'] as int? ?? 0,
      openPrice: _toDouble(json['openPrice']),
      highPrice: _toDouble(json['highPrice']),
      lowPrice: _toDouble(json['lowPrice']),
      closePrice: _toDouble(json['closePrice']),
      volume: _toDouble(json['volume']),
      closeTime: json['closeTime'] as int? ?? 0,
      isClosed: true,
    );
  }
}