using UnityEngine;
using System.Collections;

public class Joystick : MonoBehaviour {

    public Touch joystickTouch;
    public bool isUsed;
    public bool stopUse;
    public GameObject myJoystick;
    public GameObject myInput;

    Vector2 joystickPos;
    Vector2 inputPos;

    private float joystickRadius = 40.0f;
    private Vector3 direction;
    private float speed;
    // Use this for initialization
    void Start () {
        myInput.transform.position = myJoystick.transform.position;
        joystickPos = myJoystick.transform.position;
        isUsed = false;
        stopUse = true;
    }

    // Update is called once per frame
    void Update ()
    {
        if(isUsed)
        {
            if (joystickTouch.phase == TouchPhase.Moved)
            {

                inputPos = joystickTouch.position;

                Vector2 dMove = inputPos - joystickPos;

                float angle = Mathf.Atan2(dMove.y,dMove.x);

                if (Vector2.Distance(joystickPos,inputPos)<=joystickRadius)
                    myInput.transform.position = inputPos;
                else{
                    dMove.x = Mathf.Cos(angle) * joystickRadius;
                    dMove.y= Mathf.Sin(angle) * joystickRadius;
                    myInput.transform.position =  joystickPos + new Vector2(dMove.x,dMove.y);
                }
            }
            if (joystickTouch.phase == TouchPhase.Ended)
            {
                myInput.transform.position = myJoystick.transform.position;
                if(stopUse)
                {
                    isUsed = false;
                    stopUse = false;
                }
            }
            speed = Vector2.Distance(myJoystick.transform.position,myInput.transform.position)/8;
            if(speed>0)
            {
                direction = myInput.transform.position - myJoystick.transform.position;
                direction.z = direction.y;
                direction.y = 0.0f;
            }
        }
    }

    public Vector3 getDirection()
    {
        return direction;
    }

    public float getSpeed()
    {
        return speed;
    }
}