using Assets.Scripts.Enums;
using System;
using System.Collections;
using System.Collections.Generic;
using TMPro;
using UnityEngine;
using UnityEngine.InputSystem;
using UnityEngine.UI;

public class InventoryDisplay : MonoBehaviour
{
    private GameObject _playerGO;
    private Inventory inventory;
    public GameObject inventoryPanel;
    public GameObject itemContent;
    public GameObject itemUIPrefab;
    public GameObject itemNameDescription;
    public GameObject itemDescription;

    public List<GameObject> itemUIs = new List<GameObject>();

    public GameObject PlayerGO
    {
        get
        {
            if (_playerGO == null)
            {
                _playerGO = GameObject.Find("Player");
            }
            return _playerGO;
        }
        private set { _playerGO = value; }
    }

    private void Awake()
    {
        PlayerGO = GameObject.Find("Player");
        inventory = _playerGO.GetComponent<Inventory>();
        //originalRect = healthImage.rectTransform.rect;
    }
    private void OnEnable()
    {
        GameStateEvents.inventoryChanged += UpdateItemContentList;
    }
    private void OnDisable()
    {
        GameStateEvents.inventoryChanged -= UpdateItemContentList;
    }


    public void OnInventoryButtonPressed(InputAction.CallbackContext context)
    {
        //TODO: Delete this
        //if (context.started)
        //{
        //    ResumeOrPauseGame(GameManager.GameIsPaused);
        //}
        if (context.started)
        {
            inventoryPanel.SetActive(!inventoryPanel.activeSelf);
            if (inventoryPanel.activeSelf)
            {
                UpdateItemContentList();
            }
            else
            {
                //ClearItemContentList();
            }
        }
    }

    //TODO: Delete this
    //private void ResumeOrPauseGame(bool resume)
    //{
    //    if (resume)
    //    {
    //        ResumeWithMenu();
    //    }
    //    else
    //    {
    //        PauseWithMenu();
    //    }
    //}


    //TODO: Delete this
    //private void ResumeWithMenu()
    //{
    //    GameManager.ResumeGame();
    //    inventoryPanel.SetActive(false);
    //    ClearItemContentList();
    //}

    //TODO: Delete this
    //private void PauseWithMenu()
    //{
    //    GameManager.PauseGame();
    //    inventoryPanel.SetActive(true);
    //    GenerateItemContentList();
    //}

    //TODO: Delete this
    //private void GenerateItemContentList()
    //{
    //    inventory.items?.ForEach(slot =>
    //    {
    //        GameObject itemUI = Instantiate(itemUIPrefab, itemContent.transform);
    //        itemUI.transform.Find("ItemName").GetComponent<TextMeshProUGUI>().text = slot.item.itemName;
    //        itemUI.transform.Find("ItemQuantity").GetComponent<TextMeshProUGUI>().text = slot.quantity.ToString() + "x";
    //        itemUI.transform.Find("ItemIcon").GetComponent<Image>().sprite = slot.item.itemIcon;
    //        itemUIs.Add(itemUI);
    //    });
    //}

    public void OnItemClick(InventorySlot inventorySlot)
    {
        //// If itemNameDescription doesn't exist or doesn't have required component, create it
        //if (itemNameDescription == null || itemNameDescription.GetComponent<ItemUIScript>() == null)
        //{
        //    Debug.LogError("ItemNameDescription is not properly set up with ItemUIScript component");
        //    return;
        //}

        //// Toggle the description panel
        //itemNameDescription.SetActive(!itemNameDescription.activeSelf);

        //if (itemNameDescription.activeSelf)
        //{
        //    var itemUIScript = itemNameDescription.GetComponent<ItemUIScript>();
        //    if (itemUIScript != null)
        //    {
        //        itemUIScript.InventorySlot = item.InventorySlot;
        //    }
        //    else
        //    {
        //        Debug.LogError("ItemUIScript component not found on itemNameDescription");
        //    }
        //}

        //// Toggle the description panel
        //itemNameDescription.SetActive(!itemNameDescription.activeSelf);

        //if (itemNameDescription.activeSelf)
        //{
        //    // Update description panel content
        //    var nameText = itemNameDescription.transform.Find("ItemName")?.GetComponent<TextMeshProUGUI>();
        //    //var descriptionText = itemNameDescription.transform.Find("Description")?.GetComponent<TextMeshProUGUI>();
        //    itemNameDescription.GetComponent<ItemUIScript>().InventorySlot = item.InventorySlot;
        //    //if (nameText != null) nameText.text = item.InventorySlot.item.itemName;
        //    //if (descriptionText != null) descriptionText.text = item.InventorySlot.item.itemDescription;
        //}
        if (itemNameDescription.GetComponent<ItemUIScript>()?.InventorySlot?.item?.itemName == inventorySlot.item.itemName)
        {
            itemDescription.SetActive(!itemNameDescription.activeSelf);
            itemNameDescription.SetActive(!itemNameDescription.activeSelf);
        }
        else {
            itemDescription.SetActive(true);
            itemNameDescription.SetActive(true);
        }
        itemNameDescription.GetComponent<ItemUIScript>().InventorySlot = inventorySlot;
        itemDescription.GetComponent<ItemUIScript>().InventorySlot = inventorySlot;
    }

    private void UpdateItemContentList()
    {
        // First, deactivate all existing itemUIs
        itemUIs.ForEach(itemUI => itemUI.SetActive(false));

        // Keep track of which UI elements we've used
        int currentIndex = 0;

        inventory.items.ForEach(slot =>
        {
            GameObject itemUI;
            bool isCreated = false;
            // Reuse existing UI element if available
            if (currentIndex < itemUIs.Count)
            {
                itemUI = itemUIs[currentIndex];
                //itemUI.GetComponent<ItemUIScript>().InventorySlot = slot;
                itemUI.SetActive(true);
            }
            else
            {
                // Create new UI element if needed
                itemUI = Instantiate(itemUIPrefab, itemContent.transform);
                //itemUI.GetComponent<ItemUIScript>().InventorySlot = slot;
                itemUIs.Add(itemUI);
                isCreated = true;
            }
            ItemUIScript itemUIScript = itemUI.GetComponent<ItemUIScript>();
            itemUIScript.InventorySlot = slot;

            // Add click event listener only if the itemUI was just created
            if (isCreated)
                itemUI.GetComponent<Button>().onClick.AddListener(() => OnItemClick(itemUIScript.InventorySlot));
            else
            {
                // Update the itemUIScript of the itemNameDescription panel if the item is already selected
                if (itemNameDescription.GetComponent<ItemUIScript>()?.InventorySlot?.item?.itemName == slot.item.itemName)
                    itemNameDescription.GetComponent<ItemUIScript>().InventorySlot = slot;
            }

            // Update the UI elements
            //itemUI.transform.Find("ItemName").GetComponent<TextMeshProUGUI>().text = slot.item.itemName;
            //itemUI.transform.Find("ItemQuantity").GetComponent<TextMeshProUGUI>().text = slot.quantity.ToString() + "x";
            //itemUI.transform.Find("ItemIcon").GetComponent<Image>().sprite = slot.item.itemIcon;

            currentIndex++;
        });

        // Remove any excess UI elements
        if (currentIndex < itemUIs.Count)
        {
            for (int i = itemUIs.Count - 1; i >= currentIndex; i--)
            {
                Destroy(itemUIs[i]);
                itemUIs.RemoveAt(i);
            }
        }
    }

    private void ClearItemContentList()
    {
        itemUIs.ForEach(itemUI =>
        {
            Destroy(itemUI);
        });
        itemUIs.Clear();
    }
}