using Store.Modules.CloudProduct.Entities;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Store.Modules.CloudProduct.ImportConverters
{
	/// <summary>
	/// 导入商品转换工厂：按顺序尝试各转换器，返回标准商品模型。
	/// </summary>
	public class ConverterToGoodsFactory
	{
		private static readonly List<IGoodsConverter> _converters = new List<IGoodsConverter>
		{
			new ConverterV1(),
		};

		/// <summary>
		/// 根据本地 JSON 文件路径转换。
		/// </summary>
		public static ProductEntity? Convert(string filePath)
		{
			if (string.IsNullOrWhiteSpace(filePath))
				throw new ArgumentNullException(nameof(filePath));

			if (!File.Exists(filePath))
				throw new FileNotFoundException("找不到导入文件", filePath);

			string content = File.ReadAllText(filePath);
			return ConvertContent(content);
		}

		/// <summary>
		/// 根据 JSON 内容字符串转换。
		/// </summary>
		public static ProductEntity? ConvertContent(string content)
		{
			if (string.IsNullOrWhiteSpace(content))
				throw new ArgumentNullException(nameof(content));

			foreach (IGoodsConverter item in _converters)
			{
				item.ReadContent(content);
				if (item.IsMatch())
				{
					var goods = item.Convert();
					if (goods != null)
						return goods;
				}
			}

			return null;
		}
	}
}