using Store.Modules.CloudProduct.Entities;
using Store.Modules.CloudProduct.Enums;
using System.Text.Json.Nodes;

namespace Store.Modules.CloudProduct.ImportConverters
{
	/// <summary>
	/// 导入商品数据转换器
	/// </summary>
	public interface IGoodsConverter
	{
		/// <summary>
		/// 原始数据（JSON 原文）
		/// </summary>
		string RawData { get; }

		/// <summary>
		/// 获取转换器名称
		/// </summary>
		string ConverterName { get; }

		/// <summary>
		/// 支持的平台类型
		/// </summary>
		PlatformType Platform { get; }

		/// <summary>
		/// 读取内容
		/// </summary>
		/// <param name="content">JSON 原文内容</param>
		void ReadContent(string content);

		/// <summary>
		/// 判断是否匹配当前转换器
		/// </summary>
		/// <returns>是否匹配</returns>
		bool IsMatch();

		/// <summary>
		/// 转换为标准商品模型
		/// </summary>
		GoodsEntity Convert();
	}

	/// <summary>
	/// 转换器基类：统一实现读取、校验与转换骨架，子类只需实现匹配判定与字段映射。
	/// </summary>
	public abstract class GoodsConverter : IGoodsConverter
	{
		private bool _isMatch = false;

		public string RawData { get; private set; } = null!;

		public abstract string ConverterName { get; }

		public abstract PlatformType Platform { get; }

		void IGoodsConverter.ReadContent(string content)
		{
			ReadContent(content);
		}

		protected virtual void ReadContent(string content)
		{
			RawData = content;
		}

		public virtual bool IsMatch()
		{
			_isMatch = true;
			return IsMatchCore();
		}

		/// <summary>
		/// 由子类实现的具体匹配判定
		/// </summary>
		protected abstract bool IsMatchCore();

		/// <summary>
		/// 带校验的转换（基类统一实现）
		/// </summary>
		public virtual GoodsEntity Convert()
		{
			if (_isMatch == false) throw new Exception("未校验数据");
			try
			{
				JsonNode.Parse(RawData);
			}
			catch { throw new Exception("数据解析失败，不是有效的JSON格式"); }

			var goods = ConvertCore();
			if (goods == null)
				throw new Exception("转换失败");

			// 基础校验
			if (goods.GoodsId == 0)
				throw new Exception("商品ID不能为空");

			return goods;
		}

		/// <summary>
		/// 由子类实现的具体字段映射
		/// </summary>
		protected abstract GoodsEntity ConvertCore();
	}
}