using System;
using System.Collections;
using System.Collections.Generic;
using TMPro;
using Unity.Mathematics;
using UnityEngine;
using UnityEngine.XR.Interaction.Toolkit;

[ExecuteAlways]
public class InventoryItem : MonoBehaviour
{
    
    public GameObject itemPrefab;

    private GameObject _childPrefab;

    private TMP_Text itemCounterText;

    private ItemData itemData;

    public ItemSaveData saveData;
    

    private void OnEnable()
    {
        if (itemPrefab == null)
        {
            enabled = false;
            //Debug.LogError("Item has no attached prefab");
            return;
        }

        enabled = true;
        
        if (itemCounterText == null) itemCounterText = GetComponentInChildren<TMP_Text>();

        _childPrefab = GetComponentInChildren<ItemData>()?.prefab.gameObject;
        //Only attaches the prefab if it doesn't already have one ([ExecuteAlways] causes one to be spawned in editor).
        if (_childPrefab != null) return;

        _childPrefab = Instantiate(itemPrefab, transform);
        
        //todo switch to multiply instead so items with non 1,1,1 scale will retain their proportions
        _childPrefab.transform.localPosition = GetComponentInChildren<ItemData>().positionInContainer; 
        _childPrefab.transform.localScale = GetComponentInChildren<ItemData>().scaleInContainer;
        _childPrefab.transform.rotation = quaternion.identity;
        
        //Disable prefab components that arent relevant. 
        var colliderComponent = _childPrefab.GetComponent<Collider>();
        if (colliderComponent != null) colliderComponent.enabled = false;
        
        var rigidbodyComponent = _childPrefab.GetComponent<Rigidbody>();
        if (rigidbodyComponent != null)
        {
            rigidbodyComponent.isKinematic = true;
            rigidbodyComponent.useGravity = false;
        }

        var xrGrabInteractableComponent = _childPrefab.GetComponent<XRGrabInteractable>();
        if (xrGrabInteractableComponent != null) xrGrabInteractableComponent.enabled = false;


        
    }

    private void Start()
    {
        itemData = _childPrefab.GetComponent<ItemData>();
        
        if (itemData == null) Debug.LogError("Item prefab has no attached ItemData", _childPrefab);

        Debug.Log(saveData);
        if (string.IsNullOrEmpty(saveData.assetPath))
        {
            saveData.assetPath = itemData.assetLocation;
            saveData.count = saveData.count == 0 ? 1 : saveData.count;
        }
        UpdateText();
    }

    private void UpdateText()
    {
        itemCounterText.text = itemData.canStack ? saveData.count.ToString() : "";
    }

    /**
     * Changes how many items are in this itemcontainer.
     * Returns false if attempted to remove more items than exists in the container.
     */
    public bool ChangeCount(int amount)
    {
        if (saveData.count + amount < 0) return false;
        
        saveData.count += amount;
        
        if (saveData.count == 0)
        {
            //Destroys this gameobject if the count is 0 or lower 
            Destroy(gameObject);
            return true;
        }
        UpdateText();
        

        return true;
    }

    public void PopItem()
    {
        GameObject item = Instantiate(itemData.prefab, transform.position + transform.forward, Quaternion.identity);

        
        item.transform.localScale = Vector3.one;
        item.transform.name = itemData.itemName;

        var colliderComponent = item.GetComponent<Collider>();
        if (colliderComponent != null) colliderComponent.enabled = true;

        var rigidbodyComponent = item.GetComponent<Rigidbody>();
        if (rigidbodyComponent != null)
        {
            rigidbodyComponent.isKinematic = false;
            rigidbodyComponent.useGravity = true;
        }

        var xrGrabInteractableComponent = item.GetComponent<XRGrabInteractable>();
        if (xrGrabInteractableComponent != null) xrGrabInteractableComponent.enabled = true;


        ChangeCount(-1);
    }

    public int GetItemid()
    {
        return itemData.itemId;;
    }
    
    

    public override string ToString()
    {
        return $"{base.ToString()}, Count: {saveData.count}, ItemData: {itemData}";
    }
}