using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UIElements;
using UnityEngine.InputSystem;
using BITKit;
using BITKit.UX;
using BITKit.Entities;
using UnityEngine.AddressableAssets;

namespace BITFALL.UX
{
    public class Inventory : UXPanel,IWeightedCallback,IPlayerEquipCallback
    {
        [Header(Constant.Header.Input)]
        public InputActionReference inventoryAction;
        public InputActionReference returnAction;
        public InputActionGroup inputActionGroup = new();
        [Header(Constant.Header.Components)]
        public UXBar weightBar;
        [Header(Constant.Header.Prefabs)]
        public VisualTreeAsset containerTemplate;
        public VisualTreeAsset cellTemplate;
        public VisualTreeAsset itemTemplate;
        [Header(Constant.Header.Components)]
        public UXImage containerRoot;
        public UXImage serializableRoot;
        public UXFactory factory;

        [Header(Constant.Header.InternalVariables)]
        private readonly Dictionary<int, UXContainer> containers = new();

        private readonly Dictionary<string, UXContainer> equipContainers = new();
        private readonly IntervalUpdate returnInterval = new(0.1f);
        private IBasicItemContainer inventory;
        private IPlayerEquipContainer equipContainer;
        public override async void OnStart()
        {
            base.OnStart();
            inputActionGroup.RegisterCallback(returnAction, OnReturn);
            inputActionGroup.RegisterCallback(inventoryAction, OnInventory);

            foreach (var x in await ReflectionHelper.GetTypes<IEquipmentSlot>())
            {
                var element = document.rootVisualElement.Q(x.Name);
                if(element is not null)
                {
                    UXContainer uxContainer = new(element);
                    equipContainers.Add(x.Name, uxContainer);
                    element.RegisterCallback<MouseDownEvent>(mouseEvent =>
                    {
                        if (mouseEvent.button is 0)
                        {

                        }
                        else if (mouseEvent.button is 1)
                        {
                            equipContainer.TryDeEquip(System.Activator.CreateInstance(x) as IEquipmentSlot);
                        }
                    });
                }
            }
        }
        public override void Set(bool active)
        {
            base.Set(active);
            inputActionGroup.allowInput.SetElements(this, active);
            returnInterval.Reset();
        }
        void OnEnable()
        {
            IEntity.OnSpawnLocalPlayer += OnSpawnLocalPlayer;
        }
        void OnDisable()
        {
            IEntity.OnSpawnLocalPlayer -= OnSpawnLocalPlayer;
        }
        void OnSpawnLocalPlayer(IEntity entity)
        {
            entity.RegisterCallback<IWeightedCallback>(this);
            entity.RegisterCallback<IPlayerEquipCallback>(this);
            inventory = entity.Get<IBasicItemContainer>();
            equipContainer = entity.Get<IPlayerEquipContainer>();

            inventory.OnAdd += OnAdd;
            inventory.OnRemove += OnRemove;
            inventory.OnSet += OnSet;
        }
        private void OnInventory(InputAction.CallbackContext context)
        {
            if (context.action.WasPressedThisFrame() && returnInterval)
                UXFramework.Enter<HUD>();
        }
        private void OnReturn(InputAction.CallbackContext context)
        {
            if (context.started && returnInterval)
                UXFramework.Enter<HUD>();
        }

        public void OnWeighted(float current, float max)
        {
            weightBar.SetDirect( current is 0 ? 0 :(current / max).Fix(),$"{current}/{max}");
        }
        private void OnAdd(IBasicItem item)
        {
            var asset = Addressables.LoadAssetAsync<AssetableItem>(item.AdressablePath).WaitForCompletion();
            var uxContainer = factory.Create();
            uxContainer.icon.style.backgroundImage = asset.SquareIcon;
            uxContainer.contextlabel.text = asset.Name;
            uxContainer.button.clicked += () =>
            {
                UseItem(item);
            };
            uxContainer.visualElement.RegisterCallback<MouseDownEvent>(x =>
            {
                if (x.button is 1)
                {
                    ContextMenuBuilder
                    .Create()
                    .BuildAction("使用", () => UseItem(item))
                    .BuildAction("丢下", () => DropItem(item))
                    .Build();
                }
            });
            containers.Add(item.Id, uxContainer);
        }
        private void OnRemove(IBasicItem item)
        {
            if (!containers.TryGetValue(item.Id, out var uxContainer)) return;
            factory.Remove(uxContainer);
            containers.Remove(item.Id);
        }
        void OnSet(IBasicItem item)
        {
            if (!containers.TryGetValue(item.Id, out var uxContainer)) return;
            if(item.TryGetProperty<int>(out var count))
            {
                uxContainer.numberLabel.text = count.ToString();
            }
        }
        private void UseItem(IBasicItem item)
        {
            IEntity.LocalPlayer.Get<IRequestor<IBasicItem>>().Excute(item);
        }
        private void DropItem(IBasicItem item)
        {
            inventory.Drop(item.Id);
        }
        void IPlayerEquipCallback.OnEquip(IEquipmentSlot slot, IBasicItem item)
        {
            var asset = item.GetAssetable();
            if (equipContainers.TryGetValue(slot.GetType().Name, out var container))
            {
                container.icon.style.backgroundImage = asset.SquareIcon;
            }
        }

        void IPlayerEquipCallback.DeEquip(IEquipmentSlot slot, IBasicItem item)
        {
            if(equipContainers.TryGetValue(slot.GetType().Name,out var container))
            {
                container.icon.style.backgroundImage = null;
            }
        }
    }
}