using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using BITFALL.Entities.Equipment;
using BITFALL.Entities.Inventory;
using BITFALL.Guns.Modify;
using BITFALL.Items;
using BITFALL.Player.Equip;
using BITKit;
using BITKit.Entities;
using BITKit.Entities.Player;
using BITKit.UX;
using UnityEngine;
using UnityEngine.UIElements;

namespace BITFALL.UX
{
	public class UXGunModify : MonoBehaviour
	{
		[SerializeReference, SubclassSelector] private IPlayerService playerService;
		private VisualElement _container => UXInventoryInspector.Container;

		[Inject] private IEntityInventory _inventory;
		[Inject] private IEntityEquipment _equipment;
		[Inject] private IEquipService _equipService;
		[Inject] private IUXPopup _popup;
		private void Start()
		{
			UXInventoryInspector.OnInspect += OnInspect;
			
			playerService.OnPlayerInitialized += OnPlayerInitialized;
			destroyCancellationToken.Register(() =>
			{
				UXInventoryInspector.OnInspect -= OnInspect;
				playerService.OnPlayerInitialized -= OnPlayerInitialized;
			});
		}

		private void OnPlayerInitialized(Entity obj)
		{
			obj.Inject(this);
		}

		private void OnInspect(IBasicItem obj)
		{
			if (_inventory is null)
			{
				Debug.LogWarning("Inventory is null");
				return;
			}
			if (obj is null) return;
			var assetable = obj.GetAssetable();
			if (obj.TryGetProperty<GunModify>(out var modify) is false) return;
			
			var playerItems = _inventory.GetItems();

			foreach (var pair in modify.Modifies)
			{
				var container = _container.Create<VisualElement>();
				var dropdown = container.Create<DropdownField>();
				
				container.style.flexDirection = FlexDirection.Row;
				dropdown.style.flexGrow = 1;
				
				dropdown.label = pair.Key.GetType().Name;
				
				if (pair.Value is AssetableItem modifyItem)
				{
					dropdown.SetValueWithoutNotify(modifyItem.Name);
				}
				
				if (pair.Value is not null)
				{
					dropdown.SetEnabled(false);
					var button = container.Create<Button>();
					button.text = "卸下";
					button.clicked += () =>
					{
						modify.Remove(pair.Key, out var value);
						var copy = value.As<ICloneable>().Clone().As<IBasicItem>();
						if (_inventory.Add(copy))
						{
							_popup.Popup("配件已返回背包");
						}
						else if (_inventory.DropOrSpawn(copy))
						{
							_popup.Popup("背包可能已满,配件已掉落");
						}
						
						UXInventoryInspector.Entry(obj);
						RebuildPlayerLayout();
					};
				}
				else
				{
					

					var attachments = (
						from item in playerItems
						where item.GetAssetable() is AssetableAttachment attachment &&
						      attachment.Type.GetType().IsInstanceOfType(pair.Key)
						select item
					).ToArray();

					if (attachments.Length is 0 && pair.Value is null)
					{
						dropdown.SetValueWithoutNotify("无可用配件");
						dropdown.SetEnabled(false);
					}

					dropdown.choices = attachments.Select(item => item.Name).ToList();

					var nextAttachmentList = attachments.ToList();

					dropdown.RegisterValueChangedCallback(x =>
					{
						var next = nextAttachmentList[dropdown.index];
						if (_inventory.Remove(next))
						{
							var nextAsset = next.GetAssetable();
							modify.Add(pair.Key, nextAsset);
							_popup.Popup($"配件{nextAsset.name}已装备在{obj.Name}");
						}
					
						UXInventoryInspector.Entry(obj);
						RebuildPlayerLayout();
					});
				}
			}
		}
		private async void RebuildPlayerLayout()
		{
			_equipService.AllowEquip.AddDisableElements(this);
			await Task.Delay(100, destroyCancellationToken);
			_equipService.AllowEquip.RemoveDisableElements(this);
		}
	}

}