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

public class ModelTouchInteraction : MonoBehaviour
{
    private Touch touch;
    private GameObject touched;
    private float clickTime;

    public ModelExplorerController controller;

    // Start is called before the first frame update
    void Start()
    {
        
    }

    // Update is called once per frame
    void Update()
    {
        CheckTouch();
    }

    private void CheckTouch()
    {

#if UNITY_IPHONE || UNITY_ANDROID
        if(Input.touchCount > 0 && Input.GetTouch(0).phase == TouchPhase.Began)
            if (EventSystem.current.IsPointerOverGameObject(Input.GetTouch(0).fingerId))
                return;
#else
        if (EventSystem.current.IsPointerOverGameObject())
            return;
#endif
        if (CheckPointerDown())
        {
            clickTime = Time.time;
            Ray ray = Camera.main.ScreenPointToRay(GetPointerPosition());
            RaycastHit hit;
            if (Physics.Raycast(ray, out hit))
            {
                touched = hit.transform.gameObject;
            }
            else
            {
                touched = null;
            }
        }
        else if (CheckPointerUp())
        {
            float clickSpeed = Time.time - clickTime;
            if (clickSpeed < 0.25f)
            {
                Ray ray = Camera.main.ScreenPointToRay(GetPointerPosition());
                RaycastHit hit;
                if (Physics.Raycast(ray, out hit))
                {
                    if (hit.transform.gameObject == touched)
                    {
                        if (touched.GetComponent<InteractablePart>() != null)
                            touched.GetComponent<InteractablePart>().SetHighlighted();
                    }
                }
                else if (touched == null && !EventSystem.current.IsPointerOverGameObject())
                {
                    if(controller && controller.Selected)
                        controller.Selected.GetComponent<InteractablePart>().RemoveHighlighting();
                }
            }
        }
    }

    private bool CheckPointerDown()
    {
#if UNITY_IPHONE || UNITY_ANDROID
        if (Input.touchCount > 0)
        {
            touch = Input.GetTouch(0);

            if (touch.phase == TouchPhase.Began)
                return true;
        }
#else
        if (Input.GetMouseButtonDown(0))
            return true;
#endif
        return false;
    }

    private bool CheckPointerUp()
    {
#if UNITY_IPHONE || UNITY_ANDROID
        if (Input.touchCount > 0)
        {
            touch = Input.GetTouch(0);

            if (touch.phase == TouchPhase.Ended)
                return true;
        }
#else
        if (Input.GetMouseButtonUp(0))
            return true;
#endif
        return false;
    }

    private Vector3 GetPointerPosition()
    {
#if UNITY_IPHONE || UNITY_ANDROID
        return Input.GetTouch(0).position;
#else
        return Input.mousePosition;
#endif
    }
}