using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
using EPOOutline;
using KairoEngine.GameTools.InteractionTools;
using KairoEngine.UI;

namespace KairoEngine.GameTools.Selectables
{
    /// <summary>
    /// Trigger for an ISelectableOnject. This component needs to be placed with a collider component.
    /// </summary>
    public class SelectableObjectTrigger : MonoBehaviour, IPointerEnterHandler, IPointerExitHandler
    {
        private InteractionToolsManager toolsManager;
        public Outlinable outlinable;

        public ISelectableObject selectableObject;

        public bool isSelected = false;

        private void Start()
        {
            toolsManager = InteractionToolsManager.instance;
            if(outlinable == null) outlinable = GetComponent<Outlinable>();
            if(outlinable == null) outlinable = GetComponentInParent<Outlinable>();
            if(outlinable == null) outlinable = GetComponentInChildren<Outlinable>();
            if(outlinable == null) Debug.LogError($"Could not find Outlinable component in {gameObject.name} hierarchy", this.gameObject);
            if(outlinable != null) outlinable.enabled = false;
            if(selectableObject == null) gameObject.transform.parent.GetComponent<ISelectableObject>();
            if(selectableObject == null) gameObject.transform.parent.GetComponentInChildren<ISelectableObject>();
        }

        public void Select()
        {
            if(isSelected) return;
            if(MouseInputUIBlocker.BlockedByUI) return;
            isSelected = true;
            ShowOutline();
        } 

        public void Deselect() 
        {
            if(!isSelected) return;
            isSelected = false;
            HideOutline();
        }

        public void OnPointerEnter(PointerEventData eventData) => ShowOutline();

        public void OnPointerExit(PointerEventData eventData) => HideOutline();

        public void OnMouseEnter() => ShowOutline();

        public void OnMouseExit() => HideOutline();

        private void ShowOutline()
        {
            var highlightInterface = toolsManager.toolInterfaces[toolsManager.currentTools] as IHighlightableObject;
            bool hasTool = highlightInterface != null;
            if(hasTool && !MouseInputUIBlocker.BlockedByUI && highlightInterface.ShowOutline())
            {
                outlinable.enabled = true;
                outlinable.OutlineParameters.Color = highlightInterface.GetHighlightColor();
            }
        }

        private void HideOutline()
        {
            if(!isSelected) outlinable.enabled = false;
        }
    }
}