using System;
using UnityEditor;
using UnityEngine;
using UnityEngine.UI;

public class DraggedSlotController : MonoBehaviour
{
    public static DraggedSlotController Instance { get; private set; }

    [Header("Dragged Image")]
    [SerializeField] protected Image DraggedSlotImageTemplate;
    [SerializeField] protected Image DraggedSlotImage;

    [Space]
    [Header("Dragged Slot")]
    [SerializeField] protected ItemSlot _draggedSlot;
    public ItemSlot DraggedSlot // in Drag & Drop functionality for Warehouse set of panels I will temporary delegate dragged item to outside static object instance in order to remember it during dragging object from one slot to anothe one
    {
        get { return _draggedSlot; }
        set
        {
            _draggedSlot = value;
        }
    }

    public void Awake()
    {
        if (Instance == null)
        {
            Instance = this;
        }
        else
        {
            Destroy(gameObject);
        }
    }

    public bool IsDragged()
    {
        return DraggedSlot != null;
    }

    public void CreateDraggedSlot(ItemSlot itemSlot, Vector3 beginingPosition)
    {
        DraggedSlot = itemSlot;

        MakeDraggableItem(beginingPosition);
    }
    private void MakeDraggableItem(Vector3 beginingPosition)
    {
        if (DraggedSlotImage)
        {
            DraggedSlotImage.enabled = true;

            return;
        }

        GameObject globalGUI = GameObject.FindGameObjectWithTag("GUI");

        if (globalGUI)
        {
            DraggedSlotImage = MonoBehaviour.Instantiate(DraggedSlotImageTemplate, DraggedSlotImageTemplate.transform.position, Quaternion.identity, globalGUI.transform);
            DraggedSlotImage.transform.localPosition = beginingPosition;
            DraggedSlotImage.sprite = DraggedSlot.Item.Image;
            DraggedSlotImage.transform.position = Input.mousePosition;
            DraggedSlotImage.enabled = true;
        }
        else
        {
            Debug.Log("Can't find global GUI object!!!");
        }
    }

    public void UpdatePosition(Vector3 newSlotPosition)
    {
        if(DraggedSlotImage != null)
            DraggedSlotImage.transform.position = newSlotPosition;
    }

    public bool RemoveDraggedSlot()
    {
        try
        {
            DestroyImmediate(DraggedSlotImage.gameObject, true);
            DraggedSlotImage = null;

            DraggedSlot = null;
        }catch(Exception e)
        {
            Debug.LogError(e.Message);
            return false;
        }

        return true;
    }

    public void UpdateItem(Item item)
    {
        DraggedSlot.Item = (EquippableItem)item;
    }
}