using System;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UIElements;
using DG.Tweening;
using UnityEngine.Serialization;

public class Card : MonoBehaviour, IDragHandler, IBeginDragHandler, IEndDragHandler, IPointerEnterHandler, IPointerExitHandler, IPointerUpHandler, IPointerDownHandler
{
    [FormerlySerializedAs("moveSpeedLimit")]
    [Header("Movement")] 
    [SerializeField] private float moveDuration = .25f;
    [Header("States")]
    [SerializeField] private bool isHovering;
    [SerializeField] public bool IsDragging;
    [Header("Slots")]
    [SerializeField] private GameObject slot;

    [SerializeField] private CardArea parentArea;
    [SerializeField] public CardArea HoveringArea;

    public event Action PointerEnter;
    public event Action PointerExit;

    private Vector3 _grabOffset;

    private void Update()
    {
        // ClampPosition();
        
        if (IsDragging)
        {
            Vector2 targetPosition = Camera.main.ScreenToWorldPoint(Input.mousePosition) - _grabOffset;
            MoveTo(targetPosition);
        }
    }

    // Sets the slot
    public void SetSlot(GameObject slot)
    {
        this.slot = slot;
    }

    public void SetParentArea(CardArea cardArea)
    {
        parentArea = cardArea;
    }
    
    private void ClampPosition()
    {
        Vector2 screenBounds = Camera.main.ScreenToWorldPoint(new Vector3(Screen.width, Screen.height, Camera.main.transform.position.z));
        Vector3 clampedPosition = transform.position;
        clampedPosition.x = Mathf.Clamp(clampedPosition.x, -screenBounds.x, screenBounds.x);
        clampedPosition.y = Mathf.Clamp(clampedPosition.y, -screenBounds.y, screenBounds.y);
        transform.position = new Vector3(clampedPosition.x, clampedPosition.y, 0);
    }

    private void MoveTo(Vector2 targetPosition)
    {
        transform.position = targetPosition;
    }

    private void SmoothMoveTo(Vector2 targetPosition)
    {
        transform.DOMove(targetPosition, moveDuration);
    }
     
    public void OnDrag(PointerEventData eventData)
    {
        
    }

    public void OnBeginDrag(PointerEventData eventData)
    {
        Vector2 mousePosition = Camera.main.ScreenToWorldPoint(Input.mousePosition);
        _grabOffset = mousePosition - (Vector2)transform.position;
        IsDragging = true;
    }

    public void OnEndDrag(PointerEventData eventData)
    {
        IsDragging = false;
        if (HoveringArea != null)
        {
            parentArea.RemoveCardFromArea(this);
            SetParentArea(HoveringArea);
            HoveringArea.AddCardToArea(this);
            HoveringArea = null;
        }
        MoveToSlot();
    }

    public void OnPointerEnter(PointerEventData eventData)
    {
        PointerEnter?.Invoke();
    }

    public void OnPointerExit(PointerEventData eventData)
    {
        PointerExit?.Invoke();
    }

    public void OnPointerUp(PointerEventData eventData)
    {
        
    }

    public void OnPointerDown(PointerEventData eventData)
    {
        
    }

    public void MoveToSlot()
    {
        SmoothMoveTo(slot.transform.position);
    }
}