using System;
using System.Collections;
using System.Collections.Generic;
using System.Reflection;
using Newtonsoft.Json;
using Unity.Mathematics;
using UnityEngine;
using UnityEngine.UIElements;

namespace BITKit.IData
{
	public abstract class UXIEnumerableBindingHandler<TDataType> : IUXDataBinder
	{
		
		public Type TargetType =>typeof(IEnumerable<TDataType>);
		public VisualElement VisualElement { get;private set; }
		protected object target { get; private set; }
		protected FieldInfo fieldInfo{ get; private set; }
		protected VisualElement container { get; private set; }
		protected Button addButton;
		protected readonly List<TDataType> interfaceList=new();
		
		public VisualElement CreateUI(object target, FieldInfo fieldInfo)
		{
			if(VisualElement is not null){throw new InvalidOperationException($"已经创建了Inspector<{VisualElement.GetType().Name}>");}
			var exportAttribute = fieldInfo.GetCustomAttribute<ExportAttribute>();
			
			this.fieldInfo = fieldInfo;
			this.target = target;
			
			// VisualElement = new Foldout();
   //
			// VisualElement.Create<Label>().text = exportAttribute switch
			// {
			// 	not null when string.IsNullOrEmpty(exportAttribute.Name) is false => exportAttribute.Name,
   //              _=>fieldInfo.Name
			// };
			
			VisualElement = new Foldout()
			{
				text = exportAttribute switch
				{
					not null when string.IsNullOrEmpty(exportAttribute.Name) is false => exportAttribute.Name,
					_=>fieldInfo.Name
				}
			};
			VisualElement.AddToClassList("--button");
			
			container = VisualElement.Create<VisualElement>();
			addButton = VisualElement.Create<Button>();
			
			addButton.text = "+";
			
			addButton.clicked += Add;

			Rebuild();
			
			return VisualElement;
		}
		
		
		private void Add()
		{
			interfaceList.Add(default);

			switch (fieldInfo.GetValue(target))
			{
				case List<TDataType> list:
					list.Add(default);
					break;
				case TDataType[] array:
					Array.Resize(ref array, array.Length + 1);
					fieldInfo.SetValue(target, array);
					break;
			}
			
			Rebuild();
		}
		
		protected void Rebuild()
		{
			interfaceList.Clear();
			interfaceList.AddRange((IEnumerable<TDataType>)fieldInfo.GetValue(target));
			
			container.Clear();
			
			for (var index = 0; index < interfaceList.Count; index++)
			{
				var index1 = index;
				var entryContainer = container.Create<VisualElement>();
				
				entryContainer.style.flexDirection = FlexDirection.Row;
				
				var x = interfaceList[index];
				
				var textField = entryContainer.Create<TextField>();
				
				textField.isDelayed = true;
				
				if(x is not null)
				textField.SetValueWithoutNotify(JsonConvert.SerializeObject(x));

				textField.style.flexGrow = 1;
				textField.style.marginLeft = 0;
				
				textField.RegisterValueChangedCallback(OnTextFieldOnValueChanged);
				
				var removeButton = entryContainer.Create<Button>();
				//removeButton.text = $"-{index}";
				
				//u know how to do
				removeButton.style.marginTop = 0;
				
				removeButton.AddToClassList("icon-remove");

				removeButton.clicked += OnRemoveButtonOnClicked;
				
				container.Add(entryContainer);
				
				continue;
				
				void OnRemoveButtonOnClicked()
				{
					switch (fieldInfo.GetValue(target))
					{
						case List<TDataType> list:
							list.RemoveAt(index1);
							break;
						case TDataType[] array:
							interfaceList.RemoveAt(index1);
							fieldInfo.SetValue(target, interfaceList.ToArray());
							break;
					}
					Rebuild();
				}
				void OnTextFieldOnValueChanged(ChangeEvent<string> evt)
				{
					Deserialize(textField,index1,evt.newValue);
				}
			}
			
		}

		public void OnTick(float deltaTime)
		{
		}
		public void Dispose()
		{
			
			// TODO 在此释放托管资源
		}
		protected void Deserialize(TextField textField,int index,string value)
		{
			try
			{
				var newValue = (TDataType)JsonConvert.DeserializeObject(value, typeof(TDataType));
				switch (fieldInfo.GetValue(target))
				{
					case List<TDataType> list:
						list[index] = newValue;
						break;
					case TDataType[] array:
						array[index] = newValue;
						fieldInfo.SetValue(target, array);
						break;
				}
				Rebuild();
				
				textField.EnableInClassList("error",false);
			}
			catch (Exception e)
			{
				textField.Query<TextElement>().First().tooltip = e.Message;
				textField.EnableInClassList("error",true);
			}
		}
	}
	public sealed  class UXStringIEnumerableBindingHandler : UXIEnumerableBindingHandler<string>
	{
	}
	public sealed  class UXFloatIEnumerableBindingHandler : UXIEnumerableBindingHandler<float>
	{
	}
	public sealed  class UXIntIEnumerableBindingHandler : UXIEnumerableBindingHandler<int>
	{
	}
	public sealed  class UXVector3IEnumerableBindingHandler : UXIEnumerableBindingHandler<Vector3>
	{
	}
	public sealed  class UXFloat3IEnumerableBindingHandler : UXIEnumerableBindingHandler<float3>
	{
	}
}