using System.Collections.Generic;
using UnityEngine;

namespace Bansonic
{
    public static class gItemGet
    {
        private const string PrefabResourcePath = "itemGet";
        private static readonly Color FallbackColor = Color.white;

        private static GameObject currentInstance;
        private static itemGetPrefab currentController;
        private static ItemRarityColorConfigSO cachedRarityConfig;

        public struct ItemEntry
        {
            public Sprite icon;
            public string displayName;
            public int amount;
            public ItemRarity rarity;
            public bool useCustomColor;
            public Color customColor;
        }

        public static void display(params ItemEntry[] items)
        {
            display((IEnumerable<ItemEntry>)items);
        }

        public static void display(IEnumerable<ItemEntry> items)
        {
            EnsureInstance();
            if (currentController == null)
            {
                Debug.LogWarning("[gItemGet] itemGet prefab missing itemGetPrefab component.");
                return;
            }

            currentController.ClearItems();

            if (items == null)
            {
                return;
            }

            foreach (ItemEntry entry in items)
            {
                get_item_prefab item = currentController.AddItem();
                if (item == null)
                {
                    continue;
                }

                Color qualityColor = entry.useCustomColor
                    ? entry.customColor
                    : ResolveRarityColor(entry.rarity);

                item.Bind(entry.icon, entry.displayName, entry.amount, qualityColor);
            }
        }

        public static ItemEntry Create(string displayName, Sprite icon, int amount = 1, ItemRarity rarity = ItemRarity.None)
        {
            return new ItemEntry
            {
                displayName = displayName,
                icon = icon,
                amount = Mathf.Max(1, amount),
                rarity = rarity,
                useCustomColor = false,
                customColor = default
            };
        }

        public static ItemEntry Create(string displayName, Sprite icon, int amount, Color qualityColor)
        {
            return new ItemEntry
            {
                displayName = displayName,
                icon = icon,
                amount = Mathf.Max(1, amount),
                rarity = ItemRarity.None,
                useCustomColor = true,
                customColor = qualityColor
            };
        }

        public static ItemEntry FromStoreItem(storeItemSO item, int amount = 1)
        {
            if (item == null)
            {
                return Create("未知物品", null, amount, ItemRarity.None);
            }

            return Create(item.itemName, item.itemIcon, amount, item.itemRarity);
        }

        public static ItemEntry FromExpBottle(expBottlesSO item, int amount = 1)
        {
            if (item == null)
            {
                return Create("未知经验瓶", null, amount, ItemRarity.None);
            }

            return Create(item.expBottleName, item.expBottleSprite, amount, item.itemRarity);
        }

        public static ItemEntry FromGrowthMaterial(growthMaterialSO item, int amount = 1)
        {
            if (item == null)
            {
                return Create("未知培养材料", null, amount, ItemRarity.None);
            }

            return Create(item.growthMaterialName, item.growthMaterialSprite, amount, item.itemRarity);
        }

        public static ItemEntry FromEquipmentConsumable(equipmentConsumableSO item, int amount = 1)
        {
            if (item == null)
            {
                return Create("未知装备材料", null, amount, ItemRarity.None);
            }

            return Create(item.consumableName, item.consumableSprite, amount, item.itemRarity);
        }

        public static ItemEntry FromEquipment(equipmentSO equipment, int amount = 1)
        {
            if (equipment == null)
            {
                return Create("未知记忆", null, amount, ItemRarity.None);
            }

            return Create(
                equipment.GetDisplayTierName(),
                equipment.GetCurrentEquipmentSprite(),
                amount,
                ResolveEquipmentColor(equipment));
        }

        private static void EnsureInstance()
        {
            if (currentInstance != null && currentController != null)
            {
                if (!currentInstance.activeInHierarchy)
                {
                    currentInstance.SetActive(true);
                }

                return;
            }

            GameObject prefab = Resources.Load<GameObject>(PrefabResourcePath);
            if (prefab == null)
            {
                Debug.LogWarning("[gItemGet] Failed to load Resources/itemGet.prefab");
                return;
            }

            Transform parent = ResolveParent();
            currentInstance = parent != null
                ? Object.Instantiate(prefab, parent, false)
                : Object.Instantiate(prefab);

            currentInstance.name = prefab.name;
            currentController = currentInstance.GetComponent<itemGetPrefab>();
        }

        private static Transform ResolveParent()
        {
            Canvas[] canvases = Object.FindObjectsByType<Canvas>(FindObjectsInactive.Exclude, FindObjectsSortMode.None);
            Canvas best = null;

            for (int i = 0; i < canvases.Length; i++)
            {
                Canvas canvas = canvases[i];
                if (canvas == null || !canvas.gameObject.activeInHierarchy || !canvas.isRootCanvas)
                {
                    continue;
                }

                if (best == null || canvas.sortingOrder >= best.sortingOrder)
                {
                    best = canvas;
                }
            }

            return best != null ? best.transform : null;
        }

        private static Color ResolveRarityColor(ItemRarity rarity)
        {
            if (cachedRarityConfig == null)
            {
#if UNITY_EDITOR
                cachedRarityConfig = UnityEditor.AssetDatabase.LoadAssetAtPath<ItemRarityColorConfigSO>(
                    "Assets/playerBagSystem/ItemRarityColorConfig.asset");
#endif
            }

            if (cachedRarityConfig != null)
            {
                return cachedRarityConfig.GetColor(rarity, FallbackColor);
            }

            switch (rarity)
            {
                case ItemRarity.Common:
                    return new Color32(95, 155, 107, 255);
                case ItemRarity.Uncommon:
                    return new Color32(74, 134, 184, 255);
                case ItemRarity.Rare:
                    return new Color32(106, 76, 156, 255);
                case ItemRarity.Epic:
                    return new Color32(184, 134, 69, 255);
                case ItemRarity.Legendary:
                    return new Color32(184, 76, 76, 255);
                case ItemRarity.Mythic:
                    return new Color32(217, 108, 158, 255);
                case ItemRarity.Supreme:
                    return new Color32(255, 103, 164, 255);
                default:
                    return FallbackColor;
            }
        }

        private static Color ResolveEquipmentColor(equipmentSO equipment)
        {
            if (equipment == null)
            {
                return FallbackColor;
            }

            int index = equipment.GetVisualQualityColorIndex();
            switch (index)
            {
                case 1:
                    return new Color32(95, 155, 107, 255);
                case 2:
                    return new Color32(74, 134, 184, 255);
                case 3:
                    return new Color32(106, 76, 156, 255);
                case 4:
                    return new Color32(184, 134, 69, 255);
                case 5:
                    return new Color32(184, 76, 76, 255);
                default:
                    return new Color32(255, 103, 164, 255);
            }
        }
    }
}