/// 訂單簿級別
class OrderBookLevel {
  final double price;
  final double quantity;
  final double cumulative;

  const OrderBookLevel({
    required this.price,
    required this.quantity,
    this.cumulative = 0,
  });

  factory OrderBookLevel.fromJson(Map<String, dynamic> json) {
    return OrderBookLevel(
      price: (json['price'] as num).toDouble(),
      quantity: (json['quantity'] as num).toDouble(),
      cumulative: (json['cumulative'] as num?)?.toDouble() ?? 0,
    );
  }

  String get formattedPrice {
    if (price >= 1000) return price.toStringAsFixed(2);
    return price.toStringAsFixed(4);
  }

  String get formattedQuantity {
    if (quantity >= 1000) return quantity.toStringAsFixed(0);
    if (quantity >= 1) return quantity.toStringAsFixed(2);
    return quantity.toStringAsFixed(4);
  }
}

/// 訂單簿深度（含實時價格）
class OrderBookDepth {
  final List<OrderBookLevel> asks;
  final List<OrderBookLevel> bids;
  final double spread;
  final double spreadPercent;
  final double currentPrice;
  final double change24h;
  final double high24h;
  final double low24h;
  final double volume24h;
  final String tradingStatus; // "trading" / "lunch_break" / "closed"
  final double? targetLow;
  final double? targetHigh;
  final double? targetClose;

  const OrderBookDepth({
    required this.asks,
    required this.bids,
    required this.spread,
    required this.spreadPercent,
    this.currentPrice = 0,
    this.change24h = 0,
    this.high24h = 0,
    this.low24h = 0,
    this.volume24h = 0,
    this.tradingStatus = 'trading',
    this.targetLow,
    this.targetHigh,
    this.targetClose,
  });

  factory OrderBookDepth.fromJson(Map<String, dynamic> json) {
    final asksList = (json['asks'] as List?)
            ?.map((e) => OrderBookLevel.fromJson(e as Map<String, dynamic>))
            .toList() ??
        [];
    final bidsList = (json['bids'] as List?)
            ?.map((e) => OrderBookLevel.fromJson(e as Map<String, dynamic>))
            .toList() ??
        [];

    return OrderBookDepth(
      asks: asksList,
      bids: bidsList,
      spread: (json['spread'] as num?)?.toDouble() ?? 0,
      spreadPercent: (json['spreadPercent'] as num?)?.toDouble() ?? 0,
      currentPrice: (json['currentPrice'] as num?)?.toDouble() ?? 0,
      change24h: (json['change24h'] as num?)?.toDouble() ?? 0,
      high24h: (json['high24h'] as num?)?.toDouble() ?? 0,
      low24h: (json['low24h'] as num?)?.toDouble() ?? 0,
      volume24h: (json['volume24h'] as num?)?.toDouble() ?? 0,
      tradingStatus: json['tradingStatus'] as String? ?? 'trading',
      targetLow: (json['targetLow'] as num?)?.toDouble(),
      targetHigh: (json['targetHigh'] as num?)?.toDouble(),
      targetClose: (json['targetClose'] as num?)?.toDouble(),
    );
  }
}