// Version: 1.3 - Product モデル定義（フィールドプロモーション対応）
import '../services/database_helper.dart';

/// 商品情報モデル
class Product {
  int? id;
  String productCode; // データベースでは 'product_code' カラム
  String name;
  double unitPrice;
  int quantity; // 管理用（未使用）
  int stock; // 在庫管理用
  DateTime createdAt;
  DateTime updatedAt;

  Product({
    this.id,
    required this.productCode,
    required this.name,
    required this.unitPrice,
    this.quantity = 0,
    this.stock = 0,
    DateTime? createdAt,
    DateTime? updatedAt,
  }) : createdAt = createdAt ?? DateTime.now(),
       updatedAt = updatedAt ?? DateTime.now();

  /// マップから Product オブジェクトへ変換
  factory Product.fromMap(Map<String, dynamic> map) {
    return Product(
      id: map['id'] as int?,
      productCode: map['product_code'] as String, // 'product_code' を使用する
      name: map['name'] as String,
      unitPrice: (map['unit_price'] as num).toDouble(),
      quantity: map['quantity'] as int? ?? 0,
      stock: map['stock'] as int? ?? 0,
      createdAt: DateTime.parse(map['created_at'] as String),
      updatedAt: DateTime.parse(map['updated_at'] as String),
    );
  }

  /// Map に変換
  Map<String, dynamic> toMap() {
    return {
      'id': id,
      'product_code': productCode,
      'name': name,
      'unit_price': unitPrice,
      'quantity': quantity,
      'stock': stock,
      'created_at': createdAt.toIso8601String(),
      'updated_at': updatedAt.toIso8601String(),
    };
  }

  /// カピービルダ
  Product copyWith({
    int? id,
    String? productCode,
    String? name,
    double? unitPrice,
    int? quantity,
    int? stock,
    DateTime? createdAt,
    DateTime? updatedAt,
  }) {
    return Product(
      id: id ?? this.id,
      productCode: productCode ?? this.productCode,
      name: name ?? this.name,
      unitPrice: unitPrice ?? this.unitPrice,
      quantity: quantity ?? this.quantity,
      stock: stock ?? this.stock,
      createdAt: createdAt ?? this.createdAt,
      updatedAt: updatedAt ?? this.updatedAt,
    );
  }
}