// Version: 1.1 (売上モデル実装)
import 'dart:convert';

class Sale {
  int? id;
  String? saleNo;
  String customerName;
  DateTime date;
  double totalAmount;
  double taxRate;
  Map<String, dynamic>? items; // LineItem ネスト構造
  DateTime createdAt;
  DateTime updatedAt;

  Sale({
    this.id,
    this.saleNo,
    required this.customerName,
    required this.date,
    required this.totalAmount,
    this.taxRate = 10,
    this.items,
    DateTime? createdAt,
    DateTime? updatedAt,
  })  : createdAt = createdAt ?? DateTime.now(),
        updatedAt = updatedAt ?? DateTime.now();

  Map<String, dynamic> toMap() {
    return {
      'id': id,
      'sale_no': saleNo,
      'customer_name': customerName,
      'date': date.toIso8601String(),
      'total_amount': totalAmount,
      'tax_rate': taxRate,
      'items': items,
      'created_at': createdAt.toIso8601String(),
      'updated_at': updatedAt.toIso8601String(),
    };
  }

  factory Sale.fromMap(Map<String, dynamic> map) {
    return Sale(
      id: map['id'] as int?,
      saleNo: map['sale_no'] as String?,
      customerName: map['customer_name'] as String,
      date: DateTime.parse(map['date'] as String),
      totalAmount: (map['total_amount'] as num).toDouble(),
      taxRate: map['tax_rate'] as double? ?? 10,
      items: map['items'] as Map<String, dynamic>? ,
      createdAt: map['created_at'] != null ? DateTime.parse(map['created_at']) : DateTime.now(),
      updatedAt: map['updated_at'] != null ? DateTime.parse(map['updated_at']) : DateTime.now(),
    );
  }

  String toJson() => json.encode(toMap());

  factory Sale.fromJson(String source) => Sale.fromMap(json.decode(source) as Map<String, dynamic>);

  @override
  String toString() {
    return 'Sale(id: $id, saleNo: $saleNo, customerName: $customerName, date: $date, totalAmount: $totalAmount, taxRate: $taxRate, items: $items)';
  }

  @override
  bool operator ==(covariant Sale other) {
    if (identical(this, other)) return true;
    return other.id == id && other.saleNo == saleNo;
  }

  @override
  int get hashCode => id ^ saleNo;
}