using System.Collections.Generic;
using Cysharp.Threading.Tasks;
using SepCore.AsyncTask;
using SepCore.Definition;
using SepCore.Entity;
using UnityGameFramework.Runtime;

namespace SepCore.UI
{
    public enum DisplayListAreaType : byte
    {
        None = 0,
        Prop = 1,
        Weapon = 2
    }

    public partial class ShopController
    {
        private async UniTask<ShopContext> BuildContext(ShopRawData rawData)
        {
            if (rawData == null)
            {
                Log.Error("ShopFormController.BuildContext() rawData is null.");
                return null;
            }

            _rawData = rawData;

            List<GoodsItemContext> goodsItems = new List<GoodsItemContext>();
            foreach (var item in rawData.GoodsItems)
            {
                var context = await CreateGoodsItemContextAsync(item);
                goodsItems.Add(context);
            }

            return new ShopContext(rawData)
            {
                GoodsItems = goodsItems,
                PropListContext =
                    BuildDisplayListContext(DisplayListAreaType.Prop, rawData.PropItems, rawData.PropMaxCount),
                WeaponListContext = BuildDisplayListContext(DisplayListAreaType.Weapon, rawData.WeaponItems,
                    rawData.WeaponMaxCount),
                StatContext = BuildStatContext(rawData.StatRawData),
                NeedRefreshGoodsItems = true,
                NeedRefreshPlayerCoin = true,
                NeedRefreshPropList = true,
                NeedRefreshWeaponList = true,
                NeedRefreshStat = true,
                NeedRefreshPrice = true
            };
        }

        private static StatContext BuildStatContext(StatRawData rawData)
        {
            if (rawData == null)
            {
                Log.Error("ShopController.BuildStatContext: rawData is null.");
            }

            return new StatContext(rawData);
        }

        private static DisplayListContext BuildDisplayListContext(DisplayListAreaType listType,
            IReadOnlyList<object> items, int maxCount)
        {
            DisplayItemContext[] itemContexts = new DisplayItemContext[items.Count];
            switch (listType)
            {
                case DisplayListAreaType.Weapon:
                    IReadOnlyList<WeaponBase> weapons = (IReadOnlyList<WeaponBase>)items;
                    for (int i = 0; i < weapons.Count; i++)
                    {
                        itemContexts[i] = BuildWeaponItem(weapons[i]);
                    }

                    break;

                case DisplayListAreaType.Prop:
                    IReadOnlyList<PropItem> propItems = (IReadOnlyList<PropItem>)items;
                    for (int i = 0; i < propItems.Count; i++)
                    {
                        itemContexts[i] = BuildPropItem(propItems[i]);
                    }

                    break;
            }

            return new DisplayListContext
            {
                CurrentCount = itemContexts.Length,
                MaxCount = maxCount,
                ItemContexts = itemContexts
            };
        }

        private static DisplayItemContext BuildPropItem(PropItem propItem)
        {
            return new DisplayItemContext
            {
                IconAssetName = propItem.IconAssetName,
                Rarity = propItem.Rarity,
                IsWeapon = false
            };
        }

        private static DisplayItemContext BuildWeaponItem(WeaponBase weaponBase)
        {
            return new DisplayItemContext
            {
                IconAssetName = weaponBase.WeaponData.Sprite,
                Rarity = weaponBase.WeaponData.Rarity,
                IsWeapon = true
            };
        }

        private static void AppendDisplayItemContext(DisplayListContext listContext, DisplayItemContext newItem)
        {
            int oldCount = listContext.ItemContexts.Length;
            DisplayItemContext[] newContexts = new DisplayItemContext[oldCount + 1];
            if (oldCount > 0)
            {
                System.Array.Copy(listContext.ItemContexts, newContexts, oldCount);
            }

            newContexts[oldCount] = newItem;
            listContext.ItemContexts = newContexts;
            listContext.CurrentCount = oldCount + 1;
        }

        private async UniTask<GoodsItemContext> CreateGoodsItemContextAsync(GoodsItemRawData rawData,
            float timeout = 30f)
        {
            var context = new GoodsItemContext(rawData);
            context.Icon = context.ItemType switch
            {
                ItemType.Weapon => await SpriteLoader.LoadSpriteByKeyAsync(rawData.DataRow switch
                {
                    WeaponConfig weaponConfig => weaponConfig.Sprite,
                    WeaponData weaponData => weaponData.Sprite,
                    _ => string.Empty
                }),
                ItemType.Prop => await SpriteLoader.LoadSpriteByKeyAsync(((PropConfig)rawData.DataRow).Sprite),
                _ => null
            };
            return context;
        }
    }
}