/// 幣種模型
class Coin {
  final int id;
  final String code;
  final String name;
  final String? icon;
  final double price;
  final double? priceUsd;
  final double? priceCny;
  final int priceType; // 1=實時價格, 2=管理員設置
  final double change24h;
  final double? high24h;
  final double? low24h;
  final double? volume24h;
  final int status;
  final int sort;

  Coin({
    required this.id,
    required this.code,
    required this.name,
    this.icon,
    required this.price,
    this.priceUsd,
    this.priceCny,
    required this.priceType,
    required this.change24h,
    this.high24h,
    this.low24h,
    this.volume24h,
    required this.status,
    this.sort = 0,
  });

  factory Coin.fromJson(Map<String, dynamic> json) {
    return Coin(
      id: json['id'] as int? ?? 0,
      code: json['code'] as String? ?? '',
      name: json['name'] as String? ?? '',
      icon: json['icon'] as String?,
      price: (json['price'] as num?)?.toDouble() ?? 0,
      priceUsd: (json['priceUsd'] as num?)?.toDouble(),
      priceCny: (json['priceCny'] as num?)?.toDouble(),
      priceType: json['priceType'] as int? ?? 1,
      change24h: (json['change24h'] as num?)?.toDouble() ?? 0,
      high24h: (json['high24h'] as num?)?.toDouble(),
      low24h: (json['low24h'] as num?)?.toDouble(),
      volume24h: (json['volume24h'] as num?)?.toDouble(),
      status: json['status'] as int? ?? 1,
      sort: json['sort'] as int? ?? 0,
    );
  }

  Map<String, dynamic> toJson() {
    return {
      'id': id,
      'code': code,
      'name': name,
      'icon': icon,
      'price': price,
      'priceUsd': priceUsd,
      'priceCny': priceCny,
      'priceType': priceType,
      'change24h': change24h,
      'high24h': high24h,
      'low24h': low24h,
      'volume24h': volume24h,
      'status': status,
      'sort': sort,
    };
  }

  /// 顯示圖標（Unicode 符號）
  String get displayIcon {
    const icons = {
      'BTC': '\u20BF',
      'ETH': '\u039E',
      'SOL': '\u25CD',
      'USDT': '\u20AE',
      'DOGE': '\uD83D\uDC15',
      'XRP': '\u2715',
      'BNB': '\u25B3',
      'ADA': '\u25C6',
    };
    return icons[code] ?? '\u25CF';
  }

  /// 格式化價格顯示
  String get formattedPrice {
    if (price >= 1000) return price.toStringAsFixed(2);
    if (price >= 1) return price.toStringAsFixed(4);
    return price.toStringAsFixed(6);
  }

  /// 格式化漲跌幅
  String get formattedChange {
    final prefix = change24h >= 0 ? '+' : '';
    return '$prefix${change24h.toStringAsFixed(2)}%';
  }

  /// 是否上漲
  bool get isUp => change24h >= 0;

  /// 是否為實時價格
  bool get isRealtime => priceType == 1;
}