using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using UnityEngine;
using UnityEngine.UIElements;

namespace BITKit.UX
{
	/// <summary>
	/// 基于Json的Table生成元素
	/// </summary>
	public class JsonBasedTable : VisualElement
	{
		public new class UxmlTraits : VisualElement.UxmlTraits
		{
			private readonly UxmlStringAttributeDescription m_JsonAttribute = new ()
			{
				name = "Json"
			};
			private readonly UxmlBoolAttributeDescription m_allowWarningsAttribute = new ()
			{
				name = "allowWarnings",
				defaultValue = false
			};

			public override void Init(VisualElement ve, IUxmlAttributes bag, CreationContext cc)
			{
				base.Init(ve, bag, cc);
				var table = (JsonBasedTable)ve;
				table.Json = m_JsonAttribute.GetValueFromBag(bag, cc);
				table.AllowWarning = m_allowWarningsAttribute.GetValueFromBag(bag, cc);
			}
		}
		public new class UxmlFactory : UxmlFactory<JsonBasedTable, UxmlTraits> { }
		private string _json;

		public string Json
		{
			get => _json;
			set
			{
				_json = value;
				ApplyJson();
			}
		}
		public bool AllowWarning { get; set; }
		private readonly List<VisualElement> instanceColumns = new();
		private void ApplyJson()
		{
			try
			{
				Clear();
				style.flexDirection = FlexDirection.Row;
				style.justifyContent = Justify.FlexStart;
				instanceColumns.Clear();

				if (string.IsNullOrEmpty(Json)) return;
				
				var jArray = JArray.Parse(Json);
				var colLength = jArray.Max(x => x.Count());
				var rowLength = jArray.Count;
				for (var i = 0; i < colLength; i++)
				{
					var newContainer = this.Create<VisualElement>();
					newContainer.name = $"{nameof(VisualElement)}-{i}";
					instanceColumns.Add(newContainer);
				}
				for (var y = 0; y < rowLength; y++)
				{
					var array = jArray[y] as JArray;
					for (var x = 0; x < colLength; x++)
					{
						var instance = instanceColumns[x];
						if (x >= array!.Count)
						{
							instance.Create<VisualElement>();
						}
						else
						{
							var label = instance.Create<Label>();
							label.text = array[x].ToString();
						}
				
					}
				}
			}
			catch (Exception)
			{
				if (AllowWarning)
					throw;
			}
		}
	}
}