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

public class Joystick : MonoBehaviour
{   
    public bool DissappearOnEnd = true;
    private Vector3 defaultPosition;
    public bool touchDown;
    public bool autoConfigMaxDist;
    public float maxDist = 100;
    public Vector2 input;
    private Vector2 deltaPos;
    private Vector2 startPos;
    private Vector2 endPos;
    public RectTransform joyBG;
    public RectTransform joyStick;
    
    void Start(){
        defaultPosition = joyBG.localPosition;
    }

    public void SetDefaultPosition(Vector2 newDef){
        defaultPosition = newDef;
        endJoy();
    }

    public void onDrag(BaseEventData pointer)
    {
        PointerEventData ped = pointer as PointerEventData;
        endPos = ped.position;
        deltaPos = endPos - startPos;

        deltaPos = new Vector2(Mathf.Clamp(deltaPos.x, -maxDist, maxDist), Mathf.Clamp(deltaPos.y, -maxDist, +maxDist));

        Vector2 _input = new Vector2(deltaPos.x / maxDist, deltaPos.y / maxDist);

        if (_input.magnitude < 0.1f)
        {
            return;
        }
        input = _input;

        input = (input.magnitude > 1.0f) ? input.normalized : input;

        joyStick.localPosition = new Vector2(input.x * (joyBG.sizeDelta.x / 2f), input.y * (joyBG.sizeDelta.y / 2f));
    }

    public void pointerDown(BaseEventData pointer)
    {
        PointerEventData ped = pointer as PointerEventData;
        startJoy(ped);
    }

    public void pointerUp()
    {
        endJoy();
    }


    void startJoy(PointerEventData pointer)
    {
        startPos = pointer.position;
        joyBG.gameObject.SetActive(true);
        joyStick.gameObject.SetActive(true);
        joyStick.localPosition = Vector2.zero;
        joyBG.position = startPos;
        
        touchDown = true;
        

    }

    void endJoy()
    {
        input=Vector2.zero;
        joyBG.localPosition = defaultPosition;
        joyStick.localPosition = Vector2.zero;
        joyBG.gameObject.SetActive(!DissappearOnEnd);
        joyStick.gameObject.SetActive(!DissappearOnEnd);
        touchDown = false;
    }
}