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

namespace Store.Modules.CloudProduct.ImportConverters
{
	/// <summary>
	/// PDD 前端商品详情数据转换器（数据源格式见 data.txt）
	/// </summary>
	internal class PddGoodsConverter : GoodsConverter
	{
		public override string ConverterName => nameof(PddGoodsConverter);

		public override PlatformType Platform => PlatformType.PDD;

		protected override bool IsMatchCore()
		{
			try
			{
				if (JsonNode.Parse(RawData) is not JsonObject root)
					return false;

				// data.txt：顶层包含 goods.goods_id
				if (root["goods"] is JsonObject goodsObj && goodsObj["goods_id"] != null)
					return true;

				// 也兼容顶层直接是商品对象的情况
				if (root["goods_id"] != null && (root["goods_name"] != null || root["title"] != null))
					return true;

				return false;
			}
			catch
			{
				return false;
			}
		}

		protected override GoodsEntity ConvertCore()
		{
			if (JsonNode.Parse(RawData) is not JsonObject root)
				throw new Exception("无法解析 PDD 商品数据");

			var goodsNode = root["goods"] as JsonObject ?? root;
			var priceNode = root["price"] as JsonObject;

			var goods = new GoodsEntity
			{
				Platform = (byte)PlatformType.PDD,
				GoodsId = GetLong(goodsNode, "goods_id"),
				Title = GetString(goodsNode, "goods_name")
					?? GetString(goodsNode, "short_name")
					?? string.Empty,
				Description = GetString(goodsNode, "share_desc") ?? GetString(goodsNode, "short_name"),
				ThumbUrl = GetString(goodsNode, "hd_url") ?? GetString(goodsNode, "thumb_url") ?? GetString(goodsNode, "hd_thumb_url") ?? GetString(goodsNode, "image_url"),
				CatId1 = GetIntOrNull(goodsNode, "cat_id_1"),
				CatId2 = GetIntOrNull(goodsNode, "cat_id_2"),
				CatId3 = GetIntOrNull(goodsNode, "cat_id_3"),
				CatId4 = GetIntOrNull(goodsNode, "cat_id_4"),
				SoldQuantity = GetInt(goodsNode, "sold_quantity"),
				Status = 0,
			};

			var price = GetPriceRange(priceNode, root);
			goods.MinPrice = price.Min;
			goods.MaxPrice = price.Max;

			return goods;
		}

		private static string? GetString(JsonObject? obj, string key)
		{
			if (obj == null || !obj.TryGetPropertyValue(key, out var node) || node == null)
				return null;

			if (node is JsonValue value && value.TryGetValue<string>(out var str))
				return str;

			return node.ToJsonString();
		}

		private static long GetLong(JsonObject? obj, string key)
		{
			if (obj == null || !obj.TryGetPropertyValue(key, out var node) || node == null)
				return 0;

			if (node is JsonValue value)
			{
				if (value.TryGetValue<long>(out var l)) return l;
				if (value.TryGetValue<decimal>(out var d)) return (long)d;
				if (long.TryParse(value.ToString(), out var l2)) return l2;
			}

			return 0;
		}

		private static int GetInt(JsonObject? obj, string key)
		{
			if (obj == null || !obj.TryGetPropertyValue(key, out var node) || node == null)
				return 0;

			if (node is JsonValue value)
			{
				if (value.TryGetValue<int>(out var i)) return i;
				if (value.TryGetValue<long>(out var l)) return (int)l;
				if (int.TryParse(value.ToString(), out var i2)) return i2;
			}

			return 0;
		}

		private static int? GetIntOrNull(JsonObject? obj, string key)
		{
			if (obj == null || !obj.TryGetPropertyValue(key, out var node) || node == null)
				return null;

			if (node is JsonValue value)
			{
				if (value.TryGetValue<int>(out var i) && i > 0) return i;
				if (value.TryGetValue<long>(out var l) && l > 0) return (int)l;
				if (int.TryParse(value.ToString(), out var i2) && i2 > 0) return i2;
			}

			return null;
		}

		private static long? GetLongOrNull(JsonObject? obj, string key)
		{
			if (obj == null || !obj.TryGetPropertyValue(key, out var node) || node == null)
				return null;

			if (node is JsonValue value)
			{
				if (value.TryGetValue<long>(out var d)) return d;
				if (value.TryGetValue<long>(out var l)) return l;
				if (long.TryParse(value.ToString(), out var d2)) return d2;
			}

			return null;
		}

		/// <summary>
		/// 计算价格区间。优先使用顶层 price 节点，其次遍历 sku。
		/// </summary>
		private static (long? Min, long? Max) GetPriceRange(JsonObject? priceNode, JsonObject root)
		{
			long? min = null;
			long? max = null;

			if (priceNode != null)
			{
				min = GetLongOrNull(priceNode, "min_group_price");
				max = GetLongOrNull(priceNode, "max_group_price");
				if (min.HasValue || max.HasValue)
					return (min, max);
			}

			if (root["sku"] is JsonArray skuArray && skuArray.Count > 0)
			{
				foreach (var item in skuArray.OfType<JsonObject>())
				{
					var price = GetLongOrNull(item, "group_price") ?? GetLongOrNull(item, "normal_price");
					if (price == null) continue;

					min = min.HasValue ? Math.Min(min.Value, price.Value) : price;
					max = max.HasValue ? Math.Max(max.Value, price.Value) : price;
				}

				if (min.HasValue || max.HasValue)
					return (min, max);
			}

			return (null, null);
		}
	}
}