using System.Collections.Generic;
using SepCore.Event;
using UnityGameFramework.Runtime;

namespace SepCore.UI
{
    public partial class ShopForm : UGuiForm
    {
        private readonly List<ShopGoodsItem> _goodsItems = new List<ShopGoodsItem>();

        private ShopContext _context;

        private bool _listenersBound;

        public void RefreshUI(ShopContext context)
        {
            EnsureButtonListeners();

            _context = context;

            if (context.NeedRefreshGoodsItems)
            {
                View.titleFormatText.Set(context.CurrentLevel);
                View.continueButtonFormatText.Set(context.CurrentLevel + 1);
                RefreshGoodsItems(context.GoodsItems);
                context.NeedRefreshGoodsItems = false;
            }

            if (context.NeedRefreshPrice)
            {
                View.refreshButtonFormatText.Set(context.RefreshPrice);
                context.NeedRefreshPrice = false;
            }

            if (context.NeedRefreshPlayerCoin)
            {
                View.playerCoinFormatText.Set(context.PlayerCoin);
                context.NeedRefreshPlayerCoin = false;
            }

            if (context.NeedRefreshPropList)
            {
                View.propList.OnInit(context.PropListContext);
                context.NeedRefreshPropList = false;
            }

            if (context.NeedRefreshWeaponList)
            {
                View.weaponList.OnInit(context.WeaponListContext);
                context.NeedRefreshWeaponList = false;
            }
        }

        protected override void OnOpen(object userData)
        {
            base.OnOpen(userData);

            if (userData is not ShopContext context)
            {
                Log.Error("ShopForm requires ShopContext as userData.");
                return;
            }

            RefreshUI(context);
        }

        protected override void OnClose(bool isShutdown, object userData)
        {
            _context = null;

            for (int i = 0; i < _goodsItems.Count; i++)
            {
                _goodsItems[i].OnReset();
            }

            View.propList.OnReset();
            View.weaponList.OnReset();

            base.OnClose(isShutdown, userData);
        }

        private void EnsureButtonListeners()
        {
            if (_listenersBound)
            {
                return;
            }

            _listenersBound = true;

            View.continueButton.onClick.AddListener(OnContinueButtonClick);
            View.refreshButton.onClick.AddListener(OnRefreshButtonClick);
        }

        private void RefreshGoodsItems(List<GoodsItemContext> goodsItems)
        {
            EnsureGoodsItemCount(goodsItems.Count);

            for (int i = 0; i < _goodsItems.Count; i++)
            {
                ShopGoodsItem item = _goodsItems[i];
                if (i < goodsItems.Count && goodsItems[i] != null)
                {
                    item.Init(goodsItems[i], i);
                    item.gameObject.SetActive(true);
                }
                else
                {
                    item.OnReset();
                    item.gameObject.SetActive(false);
                }
            }
        }

        private void EnsureGoodsItemCount(int count)
        {
            while (_goodsItems.Count < count)
            {
                ShopGoodsItem item = Instantiate(View.goodsItemTemplate, View.GoodsItemRoot);
                _goodsItems.Add(item);
            }
        }

        public void OnContinueButtonClick()
        {
            GameEntry.Event.Fire(this, ShopContinueEventArgs.Create());
        }

        public void OnRefreshButtonClick()
        {
            GameEntry.Event.Fire(this, ShopRefreshEventArgs.Create(_context.RefreshPrice));
        }
    }
}