using Cysharp.Threading.Tasks;
using SepCore.Event;
using SepCore.Definition;
using SepCore.Entity.Weapon;
using GameFramework.Event;
using UnityEngine;
using UnityGameFramework.Runtime;

namespace SepCore.UI
{
    public partial class ShopController : UIControllerBase<ShopContext, ShopForm>
    {
        private ShopUseCase _useCase;
        private ShopRawData _rawData;
        private bool _tooltipLocked = false;

        protected override UIFormType UIFormType => UIFormType.ShopForm;

        protected override void RefreshUI(ShopForm form, ShopContext context)
        {
            form.RefreshUI(context);
        }

        protected override void SubscribeCustomEvents()
        {
            GameEntry.Event.Subscribe(ShopRefreshEventArgs.EventId, ShopRefresh);
            GameEntry.Event.Subscribe(ShopPurchaseEventArgs.EventId, ShopPurchase);
            GameEntry.Event.Subscribe(ShopContinueEventArgs.EventId, ShopContinue);
            GameEntry.Event.Subscribe(DisplayItemHoverEventArgs.EventId, DisplayItemHover);
            GameEntry.Event.Subscribe(DisplayItemLockEventArgs.EventId, DisplayItemLock);
            GameEntry.Event.Subscribe(DisplayItemHideEventArgs.EventId, DisplayItemHide);
            GameEntry.Event.Subscribe(PlayerCoinChangeEventArgs.EventId, PlayerCoinChange);
            GameEntry.Event.Subscribe(OpenUIFormSuccessEventArgs.EventId, OpenUIFormComplete);
        }

        protected override void UnsubscribeCustomEvents()
        {
            GameEntry.Event.Unsubscribe(ShopRefreshEventArgs.EventId, ShopRefresh);
            GameEntry.Event.Unsubscribe(ShopPurchaseEventArgs.EventId, ShopPurchase);
            GameEntry.Event.Unsubscribe(ShopContinueEventArgs.EventId, ShopContinue);
            GameEntry.Event.Unsubscribe(DisplayItemHoverEventArgs.EventId, DisplayItemHover);
            GameEntry.Event.Unsubscribe(DisplayItemLockEventArgs.EventId, DisplayItemLock);
            GameEntry.Event.Unsubscribe(DisplayItemHideEventArgs.EventId, DisplayItemHide);
            GameEntry.Event.Unsubscribe(PlayerCoinChangeEventArgs.EventId, PlayerCoinChange);
            GameEntry.Event.Unsubscribe(OpenUIFormSuccessEventArgs.EventId, OpenUIFormComplete);
        }

        #region UI Methods

        public override async UniTask CloseUIAsync(object userData = null, float timeout = 30f)
        {
            GameEntry.UIRouter.CloseUIAsync(UIFormType.ItemTooltipForm).Forget();
            _rawData = null;
            _tooltipLocked = false;
            await base.CloseUIAsync(userData, timeout);
        }

        public async UniTask<int?> OpenUIAsync(ShopRawData rawData, float timeout = 30f)
        {
            ShopContext context = await BuildContext(rawData);
            return await OpenFormAsync(context, timeout);
        }

        public override async UniTask OpenUIAsync(object userData = null, float timeout = 30f)
        {
            if (userData is ShopRawData rawData)
            {
                await OpenUIAsync(rawData, timeout);
                return;
            }

            if (userData != null)
            {
                Log.Warning("ShopController.OpenUIAsync() userData type is invalid.");
                return;
            }

            if (_useCase == null)
            {
                Log.Error("ShopController.OpenUIAsync() useCase is null.");
                return;
            }

            ShopRawData initialRawData = _useCase.CreateInitialModel();
            await OpenUIAsync(initialRawData, timeout);
        }

        public override void BindUseCase(IUIUseCase useCase)
        {
            if (useCase is not ShopUseCase shopFormUseCase)
            {
                Log.Error("ShopForm.BindUseCase() useCase is invalid.");
                return;
            }

            _useCase = shopFormUseCase;
        }

        #endregion

        #region Service

        private async UniTask RefreshGoodsItems(ShopRefreshResult result)
        {
            for (int i = 0; i < result.GoodsItems.Count; i++)
            {
                if (i < Context.GoodsItems.Count)
                {
                    Context.GoodsItems[i] = await CreateGoodsItemContextAsync(result.GoodsItems[i]);
                }
                else Context.GoodsItems.Add(await CreateGoodsItemContextAsync(result.GoodsItems[i]));
            }

            if (Context.GoodsItems.Count != result.GoodsItems.Count)
            {
                int count = Context.GoodsItems.Count - result.GoodsItems.Count;
                Context.GoodsItems.RemoveRange(result.GoodsItems.Count, count);
            }

            Context.RefreshPrice = result.RefreshPrice;
            Context.NeedRefreshGoodsItems = true;
            Context.NeedRefreshPrice = true;

            RefreshUI(Form, Context);
        }

        private void ApplyGoodsPurchased(ShopPurchaseResult result)
        {
            if (Context.GoodsItems != null && result.GoodsIndex >= 0 && result.GoodsIndex < Context.GoodsItems.Count)
            {
                Context.GoodsItems[result.GoodsIndex] = null;
            }

            DisplayItemContext context = new DisplayItemContext(result.DisplayItem);

            if (result.DisplayItem != null)
            {
                if (result.DisplayItem.IsWeapon)
                {
                    AppendDisplayItemContext(Context.WeaponListContext, context);
                    Context.NeedRefreshWeaponList = true;
                }
                else
                {
                    AppendDisplayItemContext(Context.PropListContext, context);
                    Context.NeedRefreshPropList = true;
                }
            }

            Context.NeedRefreshGoodsItems = true;
            RefreshUI(Form, Context);
        }

        private bool TryGetWeaponInfoRawData(int index, Vector3 targetPos, out ItemTooltipRawData rawData)
        {
            rawData = null;

            if (_rawData?.WeaponItems == null)
            {
                Log.Error("ShopFormController.TryGetWeaponInfoRawData() WeaponItems is null.");
                return false;
            }

            if (Context == null)
            {
                Log.Error("ShopFormController.TryGetWeaponInfoRawData() Context is null.");
                return false;
            }

            if (index < 0 || index >= _rawData.WeaponItems.Count)
            {
                Log.Error($"ShopFormController.TryGetWeaponInfoRawData() invalid weapon index: {index}.");
                return false;
            }

            WeaponBase weapon = _rawData.WeaponItems[index];
            if (weapon?.WeaponData == null)
            {
                Log.Error($"ShopFormController.TryGetWeaponInfoRawData() weapon data is null at index {index}.");
                return false;
            }

            rawData = new ItemTooltipRawData
            {
                TargetPos = targetPos,
                Index = index,
                WeaponData = weapon.WeaponData,
                Rarity = weapon.WeaponData.Rarity,
                ItemType = ItemType.Weapon,
                Price = _useCase.CalculateRecyclePrice(weapon.WeaponData.Price),
                OnRecycle = RecycleWeapon,
            };
            return true;
        }

        private bool TryGetPropInfoRawData(int index, Vector3 targetPos, out ItemTooltipRawData rawData)
        {
            rawData = null;

            if (_rawData?.PropItems == null)
            {
                Log.Error("ShopFormController.TryGetPropInfoRawData() PropItems is null.");
                return false;
            }

            if (index < 0 || index >= _rawData.PropItems.Count)
            {
                Log.Error($"ShopFormController.TryGetPropInfoRawData() invalid prop index: {index}.");
                return false;
            }

            PropItem propItem = _rawData.PropItems[index];
            if (propItem == null)
            {
                Log.Error($"ShopFormController.TryGetPropInfoRawData() prop item is null at index {index}.");
                return false;
            }

            rawData = new ItemTooltipRawData
            {
                TargetPos = targetPos,
                Index = index,
                PropData = propItem,
                Rarity = propItem.Rarity,
                ItemType = ItemType.Prop,
                Price = 0
            };
            return true;
        }

        private void RecycleWeapon(int index, int price)
        {
            if (_useCase == null || Context == null)
            {
                Log.Error("ShopFormController.RecycleWeapon() controller state is invalid.");
                return;
            }

            bool success = _useCase.TryRecycleWeapon(index, price);
            if (!success)
            {
                return;
            }

            if (Context.WeaponListContext != null)
            {
                int currentCount = Mathf.Max(0, Context.WeaponListContext.CurrentCount - 1);
                Context.WeaponListContext.CurrentCount = currentCount;
            }

            Context.NeedRefreshWeaponList = true;
            RefreshUI(Form, Context);
            GameEntry.UIRouter.CloseUIAsync(UIFormType.ItemTooltipForm).Forget();
        }

        #endregion

        #region Event Handlers

        private async void ShopRefresh(object sender, GameEventArgs e)
        {
            if (e is not ShopRefreshEventArgs args)
            {
                return;
            }

            ShopRefreshResult result = _useCase.TryRefresh(args.Cost);
            if (result == null)
            {
                return;
            }

            await RefreshGoodsItems(result);
        }

        private void ShopPurchase(object sender, GameEventArgs e)
        {
            if (e is not ShopPurchaseEventArgs args)
            {
                return;
            }

            OnPurchaseRequestAsync(args).Forget();
        }

        private async UniTaskVoid OnPurchaseRequestAsync(ShopPurchaseEventArgs args)
        {
            ShopPurchaseResult result = await _useCase.TryPurchaseAsync(args.GoodsIndex);
            if (result == null)
            {
                return;
            }

            ApplyGoodsPurchased(result);
        }

        private void ShopContinue(object sender, GameEventArgs e)
        {
            if (e is not ShopContinueEventArgs)
            {
                return;
            }

            _useCase?.Continue();
        }

        private void DisplayItemHover(object sender, GameEventArgs e)
        {
            if (e is not DisplayItemHoverEventArgs args)
            {
                return;
            }

            if (_rawData == null)
            {
                Log.Error("ShopFormController.OnDisplayItemHover() _rawData is null.");
                return;
            }

            ItemTooltipRawData rawData;
            bool success = args.IsWeapon
                ? TryGetWeaponInfoRawData(args.Index, args.TargetPos, out rawData)
                : TryGetPropInfoRawData(args.Index, args.TargetPos, out rawData);

            if (!success)
            {
                return;
            }

            _tooltipLocked = false;
            GameEntry.UIRouter.OpenUIAsync(UIFormType.ItemTooltipForm, rawData).Forget();
        }

        private void DisplayItemLock(object sender, GameEventArgs e)
        {
            if (e is not DisplayItemLockEventArgs)
            {
                return;
            }

            _tooltipLocked = true;
        }

        private void DisplayItemHide(object sender, GameEventArgs e)
        {
            if (e is not DisplayItemHideEventArgs args)
            {
                return;
            }

            if (_tooltipLocked)
            {
                return;
            }

            GameEntry.UIRouter.CloseUIAsync(UIFormType.ItemTooltipForm).Forget();
        }

        private void PlayerCoinChange(object sender, GameEventArgs e)
        {
            if (e is not PlayerCoinChangeEventArgs args) return;
            if (Context == null) return;

            Context.PlayerCoin = args.CoinCount;
            Context.NeedRefreshPlayerCoin = true;
            RefreshUI(Form, Context);
        }

        private void OpenUIFormComplete(object sender, GameEventArgs e)
        {
            if (e is not OpenUIFormSuccessEventArgs ne) return;

            if (ne.UIForm.Logic is ItemTooltipForm)
            {
                _tooltipLocked = false;
            }
        }

        #endregion
    }
}