/// K 线数据模型
class Candle {
  final int timestamp; // 毫秒时间戳
  final double open;
  final double high;
  final double low;
  final double close;
  final double volume;

  const Candle({
    required this.timestamp,
    required this.open,
    required this.high,
    required this.low,
    required this.close,
    required this.volume,
  });

  factory Candle.fromJson(Map<String, dynamic> json) {
    return Candle(
      timestamp: json['timestamp'] as int? ?? json['time'] as int? ?? 0,
      open: (json['open'] as num?)?.toDouble() ?? 0,
      high: (json['high'] as num?)?.toDouble() ?? 0,
      low: (json['low'] as num?)?.toDouble() ?? 0,
      close: (json['close'] as num?)?.toDouble() ?? 0,
      volume: (json['volume'] as num?)?.toDouble() ?? 0,
    );
  }

  Map<String, dynamic> toJson() => {
        'timestamp': timestamp,
        'open': open,
        'high': high,
        'low': low,
        'close': close,
        'volume': volume,
      };
}