// Version: 1.0.0
import 'dart:convert';

/// 見積（Estimate）モデル
class Estimate {
  final int id;
  final String estimateNo; // 見積書 No.
  final int? customerId;
  final String customerName;
  final DateTime date;
  final List<EstimateItem> items;
  final double taxRate;
  final double totalAmount;

  Estimate({
    required this.id,
    required this.estimateNo,
    this.customerId,
    required this.customerName,
    required this.date,
    required this.items,
    required this.taxRate,
    required this.totalAmount,
  });

  /// 引数の ID が重複しているか確認する（null 許容）
  bool hasDuplicateId(int? id) {
    if (id == null) return false;
    // items に productId が重複していないか確認
    final itemIds = items.map((item) => item.productId).toSet();
    return !itemIds.contains(id);
  }

  Map<String, dynamic> toMap() {
    return {
      'id': id,
      'estimateNo': estimateNo,
      'customerId': customerId,
      'customerName': customerName,
      'date': date.toIso8601String(),
      'itemsJson': jsonEncode(items.map((e) => e.toMap()).toList()),
      'taxRate': taxRate,
      'totalAmount': totalAmount,
    };
  }

  factory Estimate.fromMap(Map<String, dynamic> map) {
    final items = (map['itemsJson'] as String?) != null
        ? ((jsonDecode(map['itemsJson']) as List)
            .map((e) => EstimateItem.fromMap(e as Map))
            .toList())
        : [];

    return Estimate(
      id: map['id'] as int,
      estimateNo: map['estimateNo'] as String,
      customerId: map['customerId'] as int?,
      customerName: map['customerName'] as String,
      date: DateTime.parse(map['date'] as String),
      items: items,
      taxRate: (map['taxRate'] as num).toDouble(),
      totalAmount: (map['totalAmount'] as num).toDouble(),
    );
  }

  String toJson() => jsonEncode(toMap());
}

/// 見積行（EstimateItem）モデル
class EstimateItem {
  final int id;
  final int? productId;
  final String productName;
  final int quantity;
  final double unitPrice;
  final double total;

  EstimateItem({
    required this.id,
    this.productId,
    required this.productName,
    required this.quantity,
    required this.unitPrice,
    required this.total,
  });

  Map<String, dynamic> toMap() {
    return {
      'id': id,
      'productId': productId,
      'productName': productName,
      'quantity': quantity,
      'unitPrice': unitPrice,
      'total': total,
    };
  }

  factory EstimateItem.fromMap(Map<String, dynamic> map) {
    return EstimateItem(
      id: map['id'] as int,
      productId: map['productId'] as int?,
      productName: map['productName'] as String,
      quantity: map['quantity'] as int,
      unitPrice: (map['unitPrice'] as num).toDouble(),
      total: (map['total'] as num).toDouble(),
    );
  }

  String toJson() => jsonEncode(toMap());
}