class SaleItem {
  final String productId;
  final String name;
  final double price;
  final int qty;
  final bool isReseller;

  SaleItem({
    required this.productId,
    required this.name,
    required this.price,
    required this.qty,
    this.isReseller = false,
  });

  double get subtotal => price * qty;

  factory SaleItem.fromJson(Map<String, dynamic> json) {
    return SaleItem(
      productId: json['product_id'] as String? ?? '',
      name: json['name'] as String,
      price: (json['price'] as num).toDouble(),
      qty: json['qty'] as int,
      isReseller: json['isReseller'] as bool? ?? false,
    );
  }

  Map<String, dynamic> toJson() => {
        'product_id': productId,
        'name': name,
        'price': price,
        'qty': qty,
        'isReseller': isReseller,
      };
}

class Sale {
  final String id;
  final DateTime date;
  final String? userId;
  final List<SaleItem> items;
  final double subtotal;
  final double discount;
  final double total;
  final double paid;
  final double change;
  final double totalCost;
  final bool isCancelled;
  final String paymentMethod;
  final String paymentStatus;
  final double dueAmount;
  final String? customerPhone;
  final Map<String, double>? splitPayment;

  Sale({
    required this.id,
    required this.date,
    this.userId,
    required this.items,
    required this.subtotal,
    required this.discount,
    required this.total,
    required this.paid,
    required this.change,
    required this.totalCost,
    this.isCancelled = false,
    this.paymentMethod = 'tunai',
    this.paymentStatus = 'paid',
    this.dueAmount = 0.0,
    this.customerPhone,
    this.splitPayment,
  });

  factory Sale.fromJson(Map<String, dynamic> json) {
    return Sale(
      id: json['id'] as String,
      date: DateTime.parse(json['created_at'] as String),
      userId: json['user_id'] as String?,
      items: (json['items'] as List)
          .map((e) => SaleItem.fromJson(e as Map<String, dynamic>))
          .toList(),
      subtotal: (json['subtotal'] as num).toDouble(),
      discount: (json['discount'] as num).toDouble(),
      total: (json['total'] as num).toDouble(),
      paid: (json['paid'] as num).toDouble(),
      change: (json['change'] as num).toDouble(),
      totalCost: (json['total_cost'] as num?)?.toDouble() ?? 0,
      isCancelled: json['is_cancelled'] as bool? ?? false,
      paymentMethod: json['payment_method'] as String? ?? 'tunai',
      paymentStatus: json['payment_status'] as String? ?? 'paid',
      dueAmount: (json['due_amount'] as num?)?.toDouble() ?? 0.0,
      customerPhone: json['customer_phone'] as String?,
      splitPayment: json['split_payment'] != null
          ? Map<String, double>.from(json['split_payment'] as Map)
          : null,
    );
  }

  Map<String, dynamic> toJson() => {
        'id': id,
        'created_at': date.toIso8601String(),
        'user_id': userId,
        'items': items.map((e) => e.toJson()).toList(),
        'subtotal': subtotal,
        'discount': discount,
        'total': total,
        'paid': paid,
        'change': change,
        'total_cost': totalCost,
        'is_cancelled': isCancelled,
        'payment_method': paymentMethod,
        'payment_status': paymentStatus,
        'due_amount': dueAmount,
        'customer_phone': customerPhone,
        if (splitPayment != null && splitPayment!.isNotEmpty)
          'split_payment': splitPayment,
      };
}