// 販売伝票テンプレート（簡易実装）
import 'dart:convert';

class SalesInvoiceTemplate {
  final String invoiceNumber;
  final String date;
  final String customerName;
  final List<Map<String, dynamic>> items;
  final int totalAmount;
  final String taxRate;

  const SalesInvoiceTemplate({
    this.invoiceNumber = '',
    this.date = '',
    this.customerName = '',
    this.items = const <Map<String, dynamic>>[],
    this.totalAmount = 0,
    this.taxRate = '8',
  });

  factory SalesInvoiceTemplate.fromMap(Map<String, dynamic> data) {
    return SalesInvoiceTemplate(
      invoiceNumber: data['invoice'] as String? ?? '',
      date: data['date'] as String? ?? '',
      customerName: data['customer_name'] as String? ?? '',
      items: (data['items'] as List<dynamic>?)?.map((e) => e as Map<String, dynamic>).toList() ?? const <Map<String, dynamic>>[],
      totalAmount: (data['total'] as int?) ?? 0,
    );
  }

  @override
  String toString() => '販売伝票 #${invoiceNumber} (${date}, 合計：¥$totalAmount)';

  Map<String, dynamic> toJson() {
    return {'invoice': invoiceNumber, 'date': date, 'items': items.map((i) => i).toList(), 'total': totalAmount};
  }
}