using System.Collections.Generic;
using BITFALL.Entities.Equipment;
using BITFALL.Entities.Inventory;
using BITFALL.Player.Inventory;
using UnityEngine;
using UnityEngine.UIElements;
using UnityEngine.InputSystem;
using UnityEngine.InputSystem.Interactions;
using BITKit;
using BITKit.UX;
using BITKit.Entities;
using BITKit.Entities.Player;

namespace BITFALL.UX
{
    public class UXInventory : UIToolKitPanel
    {
        [Header(Constant.Header.Input)]
        public InputActionReference inventoryAction;
        public InputActionReference returnAction;
        
        
        [Header(Constant.Header.Components)]
        public UXBar weightBar;

        [Header(Constant.Header.Providers)]
        [SerializeReference, SubclassSelector] private IPlayerService playerService;
        
        [Header(Constant.Header.Components)]
        public UXBuilder builder;

        [Header(Constant.Header.InternalVariables)]
        private readonly Dictionary<int, UXContainer> itemContainers = new();
        private readonly Dictionary<string, UXContainer> equipContainers = new();
        [Inject]
        private IEntityInventory inventory;
        [Inject]
        private IEntityEquipmentContainer equipContainer;
        private IUnityEntity _unityEntity;
        protected override async void Start()
        {
            base.Start();
          

            foreach (var x in await ReflectionHelper.GetTypes<IEquipmentSlot>())
            {
                var element = document.rootVisualElement.Q(x.Name);
                if (element is null) continue;
                UXContainer uxContainer = new(element);
                equipContainers.Add(x.Name, uxContainer);
                element.RegisterCallback<MouseDownEvent>(mouseEvent =>
                {
                    if(_unityEntity is null) return;
                    switch (mouseEvent.button)
                    {
                        case 0:
                            break;
                        case 1:
                            equipContainer.TryDeEquip(System.Activator.CreateInstance(x) as IEquipmentSlot);
                            break;
                    }
                });
            }
        }

        protected override void OnPanelEntry()
        {
            base.OnPanelEntry();
            inputActionGroup.RegisterCallback(returnAction, OnReturn);
            inputActionGroup.RegisterCallback(inventoryAction, OnReturn);
        }

        protected override void OnPanelExit()
        {
            base.OnPanelExit();
            inputActionGroup.UnRegisterCallback(returnAction, OnReturn);
            inputActionGroup.UnRegisterCallback(inventoryAction, OnReturn);
        }

        protected override void OnEnable()
        {
            base.OnEnable();
            playerService.OnPlayerInitialized += OnPlayerInitializedLocalPlayer;
            playerService.OnPlayerDisposed += OnPlayerDisposed;
        }

        private void OnPlayerDisposed(Entity obj)
        {
            inventory = null;
            equipContainer = null;
        }

        protected override void OnDisable()
        {
            base.OnDisable();
            playerService.OnPlayerDisposed -= OnPlayerDisposed;
            playerService.OnPlayerInitialized -= OnPlayerInitializedLocalPlayer;
        }
        private void OnPlayerInitializedLocalPlayer(IUnityEntity unityEntity)
        {
            unityEntity.Inject(this);
            itemContainers.Clear();
            builder.Clear();
            
            var weighted = unityEntity.Get<IPlayerInventoryWeightable>();
            
            weighted.OnWeighted += OnWeighted;
            
            equipContainer.OnEquip += OnEquip;
            equipContainer.OnDeEquip += DeEquip;
            

            inventory.OnAdd += OnAdd;
            inventory.OnRemove += OnRemove;
            inventory.OnUsedItem += OnRemove;
            inventory.OnSet += OnSet;
            inventory.OnRebuild += OnRebuild;
            
            _unityEntity = unityEntity;
            
            
        }

        private void OnRebuild(IBasicItemContainer obj)
        {
            foreach (var x in itemContainers.Values)
            {
                x.visualElement.RemoveFromHierarchy();
            }

            foreach (var VARIABLE in obj.GetItems())
            {
                OnAdd(VARIABLE);
            }
        }

        private static void OnReturn(InputAction.CallbackContext context)
        {
            if (context is {interaction:PressInteraction,performed:true})
                UXService.Entry<UXHud>();
        }

        public void OnWeighted(double current, double max)
        {
            var value = current is 0 ? 0 : (current / max);
            weightBar.SetDirect((float) value,$"{current}/{max}");
        }
        private void OnAdd(IBasicItem item)
        {
            // var asset = Addressables.LoadAssetAsync<AssetableItem>(item.AddressablePath).WaitForCompletion();
            // var uxContainer = builder.BuildAsContainer();
            // uxContainer.icon.style.backgroundImage = asset.SquareIcon;
            // uxContainer.contextLabel.text = asset.Name;
            var uxContainer = UXUtils.CreateItemContainer(builder.BuildAsContainer(), item);
            uxContainer.button.clicked += () =>
            {
                UseItem(item);
            };
            uxContainer.visualElement.Q<Button>().RegisterCallback<MouseDownEvent>(x =>
            {
                if (x.button is 1)
                {
                    ContextMenuBuilder
                    .Create()
                    .BuildAction("使用", () => UseItem(item))
                    .BuildAction("丢下", () => DropItem(item))
                    .BuildAction("检视", () => UXInventoryInspector.Entry(item))
                    .Build();
                }
            });
            itemContainers.Add(item.Id, uxContainer);
        }
        private void OnRemove(IBasicItem item)
        {
            if (!itemContainers.TryGetValue(item.Id, out var uxContainer)) return;
            uxContainer.visualElement.RemoveFromHierarchy();
            itemContainers.Remove(item.Id);
        }
        private void OnSet(IBasicItem item)
        {
            if (!itemContainers.TryGetValue(item.Id, out var uxContainer)) return;
            UXUtils.CreateItemContainer(uxContainer, item);
        }

        private void UseItem(IBasicItem item)
        {
            inventory.TryUseItem(item);
        }

        private void DropItem(IBasicItem item)
        {
            inventory.Drop(item.Id);
        }
        private void OnEquip(IEquipmentSlot slot, IBasicItem item)
        {
            var asset = item.GetAssetable();
            if (!equipContainers.TryGetValue(slot.GetType().Name, out var container)) return;
            container.icon.style.backgroundImage = asset.SquareIcon;
            //BIT4Log.Log<UXInventory>($"已装备:{item.Name}@{slot.GetType().Name}");
        }
        private void DeEquip(IEquipmentSlot slot, IBasicItem item)
        {
            if (!equipContainers.TryGetValue(slot.GetType().Name, out var container)) return;
            container.icon.style.backgroundImage = null;
        }
    }
}