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

using UnityEngine;
using UnityEngine.UI;
using TMPro;
using System.Collections;
using PerfectWorld.Scripts.Shop;
using BrewMonster.Scripts.Managers;

public class NPCShopItemPanel : MonoBehaviour
{
    [Header("UI Components")]
    public TextMeshProUGUI itemNameText;
    public TextMeshProUGUI itemPriceText;
    public Image itemIconImage;
    
    private GShopItem itemData;
    private Coroutine iconLoadCoroutine;
    private NPCShopUIManager shopManager;
    private int shopItemIndex;
    
    void Start()
    {
        SetupClickHandler();
    }
    
    void SetupClickHandler()
    {
        // Check for existing Button component
        Button button = GetComponent<Button>();
        if (button == null)
            button = GetComponentInChildren<Button>();
        
        if (button != null)
        {
            button.onClick.AddListener(OnItemClicked);
        }
        else
        {
            // If no button exists, add one to the Image or create a clickable area
            if (itemIconImage != null)
            {
                // Try to add Button component to the icon image
                Button iconButton = itemIconImage.GetComponent<Button>();
                if (iconButton == null)
                    iconButton = itemIconImage.gameObject.AddComponent<Button>();
                
                if (iconButton != null)
                {
                    iconButton.onClick.AddListener(OnItemClicked);
                }
            }
        }
    }
    
    public void SetupItem(GShopItem item, NPCShopUIManager manager, int index)
    {
        itemData = item;
        shopManager = manager;
        shopItemIndex = index;
        UpdateDisplay();
    }
    
    void OnItemClicked()
    {
        if (shopManager != null && itemData.id != 0)
        {
            shopManager.ShowItemDetail(itemData, shopItemIndex);
        }
    }
    
    void UpdateDisplay()
    {
        if (itemData.id == 0)
            return;
        
        // Set item name
        if (itemNameText != null)
            itemNameText.text = itemData.name;
        
        // Set price (use first available price)
        uint price = 0;
        if (itemData.buy != null && itemData.buy.Length > 0)
        {
            for (int i = 0; i < itemData.buy.Length; i++)
            {
                if (itemData.buy[i].price > 0)
                {
                    price = itemData.buy[i].price;
                    break;
                }
            }
        }
        
        if (itemPriceText != null)
            itemPriceText.text = price > 0 ? price.ToString() : "N/A";
        
        // Load icon - use coroutine to ensure UI is ready
        if (itemIconImage != null)
        {
            // Stop any existing icon load coroutine
            if (iconLoadCoroutine != null)
            {
                StopCoroutine(iconLoadCoroutine);
            }
            
            // Start new icon load coroutine
            iconLoadCoroutine = StartCoroutine(LoadItemIconCoroutine(itemIconImage, (int)itemData.id));
        }
    }
    
    IEnumerator LoadItemIconCoroutine(Image iconImage, int itemId)
    {
        // Wait one frame to ensure UI is fully initialized
        yield return null;
        
        LoadItemIcon(iconImage, itemId);
    }
    
    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;
        }
    }
    
    void OnDestroy()
    {
        if (iconLoadCoroutine != null)
        {
            StopCoroutine(iconLoadCoroutine);
        }
        
        // Clean up button listeners
        Button button = GetComponent<Button>();
        if (button == null)
            button = GetComponentInChildren<Button>();
        
        if (button != null)
        {
            button.onClick.RemoveListener(OnItemClicked);
        }
        
        if (itemIconImage != null)
        {
            Button iconButton = itemIconImage.GetComponent<Button>();
            if (iconButton != null)
            {
                iconButton.onClick.RemoveListener(OnItemClicked);
            }
        }
    }
}