// Filename	: NPCShopDetailPanel.cs
// Creator	: Converted from C++ EC_Shop
// Date		: 2024

using UnityEngine;
using UnityEngine.UI;
using TMPro;
using BrewMonster.Scripts;
using BrewMonster.Network;
using CSNetwork.C2SCommand;

public class NPCShopDetailPanel : MonoBehaviour
{
    [Header("UI Components")]
    public TextOutlet itemDescriptionText;
    public Image itemIconImage;
    //public TextMeshProUGUI itemPriceText;
    
    [Header("Action Buttons")]
    public Button closeButton;
    public Button buyButton;
    
    private GShopItem currentItem;
    private NPCShopUIManager shopManager;
    private int shopItemIndex;
    
    void Start()
    {
        SetupEventListeners();
    }
    
    void SetupEventListeners()
    {
        if (closeButton != null)
            closeButton.onClick.AddListener(OnCloseClicked);
        
        if (buyButton != null)
            buyButton.onClick.AddListener(OnBuyButtonClicked);
    }
    
    public void SetupDetailPanel(GShopItem item, NPCShopUIManager manager, int index)
    {
        currentItem = item;
        shopManager = manager;
        shopItemIndex = index;
        
        UpdateDisplay();
    }
    
    void UpdateDisplay()
    {
        if (currentItem.id == 0)
        {
            Debug.LogWarning("[NPCShopDetailPanel] Current item ID is 0, skipping display update");
            return;
        }
        
        // Set item description
        if (itemDescriptionText != null)
        {
            string description = GetItemDescription((int)currentItem.id);
            itemDescriptionText.Set(description);
        }
        
        // Set price (use first available price)
        uint price = 0;
        if (currentItem.buy != null && currentItem.buy.Length > 0)
        {
            for (int i = 0; i < currentItem.buy.Length; i++)
            {
                if (currentItem.buy[i].price > 0)
                {
                    price = currentItem.buy[i].price;
                    break;
                }
            }
        }
        
        // if (itemPriceText != null)
        //     itemPriceText.text = price > 0 ? $"Price: {price}" : "Price: N/A";
        
        // Load icon
        if (itemIconImage != null)
        {
            LoadItemIcon(itemIconImage, (int)currentItem.id);
        }
    }
    
    void LoadItemIcon(Image iconImage, int itemId)
    {
        if (itemId <= 0 || iconImage == null)
            return;
        
        // Ensure the Image component is enabled and properly configured
        iconImage.enabled = true;
        iconImage.preserveAspect = true;
        iconImage.type = Image.Type.Simple;
        
        // Use the existing icon loading system from EC_IvtrItemUtils
        Sprite iconSprite = EC_IvtrItemUtils.Instance.ResolveItemIconSprite(itemId);
        
        if (iconSprite != null)
        {
            iconImage.sprite = iconSprite;
            iconImage.color = Color.white;
        }
        else
        {
            iconImage.sprite = null;
        }
    }
    
    string GetItemDescription(int itemId)
    {
        // First check if description is already in the item data
        if (!string.IsNullOrEmpty(currentItem.desc))
        {
            return currentItem.desc;
        }

        // Try to use EC_IvtrEquip description for equipment items (like EC_InventoryUI does)
        try
        {
            // Create EC_IvtrEquip for equipment items - this will work for weapons and armor
            EC_IvtrEquip equipment = (EC_IvtrEquip)EC_IvtrItem.CreateItem(itemId, 0, 1);
            
            // For NPC shop items, we typically have static data only
            // Try to get description using GetNormalDesc() which works with base stats
            string equipDesc = equipment.GetDesc();
            if (!string.IsNullOrEmpty(equipDesc))
            {
                // Replace C++ style "\r" line separators with real newlines for TMP
                return equipDesc.Replace("\\r", "\n");
            }
        }
        catch (System.Exception ex)
        {
            // If EC_IvtrEquip fails, fall through to EC_IvtrItem method
            Debug.LogWarning($"[NPCShopDetailPanel] Failed to get equipment description for item {itemId}: {ex.Message}");
        }

        // Fallback: build description using EC_IvtrItem (for non-equipment items)
        try
        {
            EC_IvtrItem item = EC_IvtrItem.CreateItem(itemId, 0, 1);
            if (item != null)
            {
                // For NPC shop, we typically have static data only, so load from local DB
                item.GetDetailDataFromLocal();
                string description = item.GetDesc();
                if (!string.IsNullOrEmpty(description))
                {
                    return description.Replace("\\r", "\n");
                }
            }
        }
        catch (System.Exception ex)
        {
            Debug.LogWarning($"[NPCShopDetailPanel] Failed to get description for item {itemId}: {ex.Message}");
        }

        return "No description available.";
    }
    
    void OnCloseClicked()
    {
        gameObject.SetActive(false);
    }

    void OnBuyButtonClicked()
    {
        if (currentItem.id == 0)
        {
            Debug.LogWarning("[NPCShopDetailPanel] Cannot buy item with ID 0");
            return;
        }

        // Get price from item
        uint price = 0;
        if (currentItem.buy != null && currentItem.buy.Length > 0)
        {
            for (int i = 0; i < currentItem.buy.Length; i++)
            {
                if (currentItem.buy[i].price > 0)
                {
                    price = currentItem.buy[i].price;
                    break;
                }
            }
        }

        // Server requires SEVNPC_HELLO with NPC id before buy, and the correct shop slot index
        if (shopManager != null && shopManager.CurrentNPCID != 0)
            UnityGameSession.c2s_CmdNPCSevHello((int)shopManager.CurrentNPCID);

        // Create npc_trade_item: tid = template ID, index = shop slot (server validates this), count = quantity
        npc_trade_item[] items = new npc_trade_item[1];
        items[0] = new npc_trade_item
        {
            tid = (int)currentItem.id,
            index = (uint)shopItemIndex,
            count = 1
        };

        UnityGameSession.c2s_CmdNPCSevBuy(1, items);
        
        Debug.Log($"[NPCShopDetailPanel] Sent buy command for item {currentItem.id}, price {price}");
    }
    
    void OnDestroy()
    {
        // Clean up event listeners
        if (closeButton != null)
            closeButton.onClick.RemoveListener(OnCloseClicked);
        
        if (buyButton != null)
            buyButton.onClick.RemoveListener(OnBuyButtonClicked);
    }
    
    // === Text Outlet Helper ===
    [System.Serializable]
    public class TextOutlet
    {
        [SerializeField] public Text legacy;
        [SerializeField] public TMPro.TextMeshProUGUI tmp;

        public void Set(string value)
        {
            if (legacy != null)
            {
                legacy.text = EC_Utility.FormatForLegacyText(value ?? string.Empty);
            }
            if (tmp != null)
            {
                tmp.text = EC_Utility.FormatForTextMeshPro(value ?? string.Empty);
            }
        }
    }
}