using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;

[RequireComponent(typeof(Image))]
public class ButtonBorderInteractionStateController : MonoBehaviour
{
    [SerializeField] private Color Normal;
    [SerializeField] private Color Hover;

    Image border;

    Button parentButton;

    EventTrigger eventTrigger;

    private void Awake()
    {
        border = GetComponent<Image>();

        parentButton = GetComponentInParent<Button>();

        if (parentButton == null) return;

        eventTrigger = parentButton.GetComponent<EventTrigger>();

        if(eventTrigger == null)
        {
            eventTrigger = parentButton.gameObject.AddComponent<EventTrigger>();
        }

        EventTrigger.Entry pointerEnterEntry = new EventTrigger.Entry
        {
            eventID = EventTriggerType.PointerEnter
        };
        pointerEnterEntry.callback.AddListener((x) => OnPointerEnter((PointerEventData)x));
        eventTrigger.triggers.Add(pointerEnterEntry);

        EventTrigger.Entry pointerExitEntry = new EventTrigger.Entry
        {
            eventID = EventTriggerType.PointerExit
        };
        pointerExitEntry.callback.AddListener((x) => OnPointerExit((PointerEventData)x));
        eventTrigger.triggers.Add(pointerExitEntry);
    }


    private void OnPointerEnter(PointerEventData eventData)
    {
        if (!parentButton.interactable) return;

        border.color = Hover;
    }
    private void OnPointerExit(PointerEventData eventData)
    {
        if (!parentButton.interactable) return;

        border.color = Normal;
    }
}