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flutter_monisuo/lib/data/models/order_book.dart

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+/// 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(),
+    );
+  }
+}