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

namespace SepCore.UI
{
    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 =
                    BuildDisplayListAreaContext(DisplayListAreaType.Prop, rawData.PropItems, rawData.PropMaxCount),
                WeaponListContext = BuildDisplayListAreaContext(DisplayListAreaType.Weapon, rawData.WeaponItems,
                    rawData.WeaponMaxCount),
                NeedRefreshGoodsItems = true,
                NeedRefreshPlayerCoin = true,
                NeedRefreshPropList = true,
                NeedRefreshWeaponList = true,
                NeedRefreshPrice = true
            };
        }

        private static DisplayListAreaContext BuildDisplayListAreaContext(DisplayListAreaType listType,
            IReadOnlyList<object> items, int maxCount)
        {
            string title = GetDisplayListTitle(listType);
            if (items == null)
            {
                return new DisplayListAreaContext
                {
                    Title = title,
                    CurrentCount = 0,
                    MaxCount = maxCount,
                    ItemContexts = System.Array.Empty<DisplayItemContext>()
                };
            }

            DisplayItemContext[] itemContexts = new DisplayItemContext[items.Count];
            switch (listType)
            {
                case DisplayListAreaType.Weapon:
                    if (items is IReadOnlyList<WeaponBase> weapons)
                    {
                        for (int i = 0; i < weapons.Count; i++)
                        {
                            WeaponBase weapon = weapons[i];
                            if (weapon == null) break;
                            itemContexts[i] = BuildWeaponItem(weapon);
                        }
                    }

                    break;

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

                    break;
            }

            int currentCount = itemContexts.Length;
            return new DisplayListAreaContext
            {
                Title = title,
                CurrentCount = currentCount,
                MaxCount = maxCount,
                ItemContexts = itemContexts
            };
        }

        private static string GetDisplayListTitle(DisplayListAreaType listType)
        {
            return listType switch
            {
                DisplayListAreaType.Weapon => "武器",
                DisplayListAreaType.Prop => "道具",
                _ => string.Empty
            };
        }

        private static DisplayItemContext BuildPropItem(PropItem propItem)
        {
            string iconAssetName = null;
            ItemRarity rarity = ItemRarity.None;

            if (propItem != null)
            {
                iconAssetName = propItem.IconAssetName;
                rarity = propItem.Rarity;
            }

            return new DisplayItemContext
            {
                IconAssetName = iconAssetName,
                Rarity = rarity,
                IsWeapon = false
            };
        }

        private static DisplayItemContext BuildWeaponItem(WeaponBase weaponBase)
        {
            string iconAssetName = null;
            ItemRarity rarity = ItemRarity.None;

            if (weaponBase != null && weaponBase.WeaponData != null)
            {
                iconAssetName = weaponBase.WeaponData.IconAssetName;
                rarity = weaponBase.WeaponData.Rarity;
            }

            return new DisplayItemContext
            {
                IconAssetName = iconAssetName,
                Rarity = rarity,
                IsWeapon = true
            };
        }

        private static void AppendDisplayItemContext(DisplayListAreaContext listContext, DisplayItemContext newItem)
        {
            int oldCount = listContext.ItemContexts != null ? listContext.ItemContexts.Length : 0;
            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 GameEntry.SpriteCache.GetSprite(((DRWeapon)rawData.DataRow).IconAssetName),
                ItemType.Prop => await GameEntry.SpriteCache.GetSprite(((DRProp)rawData.DataRow).IconAssetName),
                _ => null
            };
            return context;
        }
    }
}