class Inventory {
  final int warehouseId;
  final String? warehouseName;
  final int productId;
  final String? productName;
  final String? productCode;
  final String? productSpec;
  final String? productUnit;
  final String? productBrand;
  final int? minStock;
  final double quantity;

  const Inventory({
    required this.warehouseId,
    this.warehouseName,
    required this.productId,
    this.productName,
    this.productCode,
    this.productSpec,
    this.productUnit,
    this.productBrand,
    this.minStock,
    required this.quantity,
  });

  factory Inventory.fromJson(Map<String, dynamic> json) => Inventory(
        warehouseId: (json['warehouse_id'] as num).toInt(),
        warehouseName: json['warehouse_name'] as String?,
        productId: (json['product_id'] as num).toInt(),
        productName: json['product_name'] as String?,
        productCode: json['product_code'] as String?,
        productSpec: json['product_spec'] as String?,
        productUnit: json['product_unit'] as String?,
        productBrand: json['product_brand'] as String?,
        minStock: json['min_stock'] != null
            ? (json['min_stock'] as num).toInt()
            : null,
        quantity: (json['quantity'] as num).toDouble(),
      );
}

class InventoryLog {
  final int warehouseId;
  final String? warehouseName;
  final int productId;
  final String? productName;
  final String direction; // in | out
  final double quantity;
  final double? qtyBefore;
  final double? qtyAfter;
  final String? refType;
  final int? refId;
  final String? createdAt;

  const InventoryLog({
    required this.warehouseId,
    this.warehouseName,
    required this.productId,
    this.productName,
    required this.direction,
    required this.quantity,
    this.qtyBefore,
    this.qtyAfter,
    this.refType,
    this.refId,
    this.createdAt,
  });

  factory InventoryLog.fromJson(Map<String, dynamic> json) => InventoryLog(
        warehouseId: (json['warehouse_id'] as num).toInt(),
        warehouseName: json['warehouse_name'] as String?,
        productId: (json['product_id'] as num).toInt(),
        productName: json['product_name'] as String?,
        direction: json['direction'] as String,
        quantity: (json['quantity'] as num).toDouble(),
        qtyBefore: json['qty_before'] != null
            ? (json['qty_before'] as num).toDouble()
            : null,
        qtyAfter: json['qty_after'] != null
            ? (json['qty_after'] as num).toDouble()
            : null,
        refType: json['ref_type'] as String?,
        refId: json['ref_id'] != null
            ? (json['ref_id'] as num).toInt()
            : null,
        createdAt: json['created_at'] as String?,
      );
}