using UnityEngine;
using UnityEngine.UI;
using System.Collections;

public class TouchController : MonoBehaviour
{


    public delegate void TouchEventHandler(Vector2 swipe);

    public static event TouchEventHandler SwipeEvent;
    public static event TouchEventHandler SwipeEndEvent;

    Vector2 m_touchMovement;

    float m_minSwipeDistance = 25;
    float m_newSwipeDistance = 0;

    void OnSwipe()
    {
        if (SwipeEvent != null)
        {
            SwipeEvent(m_touchMovement);
        }
    }

    void OnSwipeEnd()
    {
        if (SwipeEndEvent != null)
        {
            SwipeEndEvent(m_touchMovement);
        }
    }

  //  public Text m_diagnosticText1;
   // public Text m_diagnosticText2;

    public bool m_useDiagnostic = false;

    // Use this for initialization
    void Start()
    {
        Diagnostic("", "");
    }


    void Diagnostic(string text1, string text2)
    {
        //if (m_diagnosticText1 && m_diagnosticText2)
        //{
        //    m_diagnosticText1.gameObject.SetActive(m_useDiagnostic);
        //    m_diagnosticText2.gameObject.SetActive(m_useDiagnostic);

        //}
        //if (m_diagnosticText1 != null && m_diagnosticText2 != null)
        //{
        //    m_diagnosticText1.text = text1;
        //    m_diagnosticText2.text = text2;
        //}

    }

    string SwipeDiagnostic(Vector2 swipeMovement)
    {
        string direction = "";

        // horizontal
        if (Mathf.Abs(swipeMovement.x) > Mathf.Abs(swipeMovement.y))
        {
            direction = (swipeMovement.x >= 0) ? "right" : "left";
        }
        // vertical
        else
        {
            direction = (swipeMovement.y >= 0) ? "up" : "down";
        }
        return direction;
    }


    // Update is called once per frame
    void Update()
    {
        if (Input.touchCount > 0)
        {
            Touch touch = Input.touches[0];

            if (touch.phase == TouchPhase.Began)
            {
                m_touchMovement = Vector2.zero;
                Diagnostic("", "");

            }
            else if (touch.phase == TouchPhase.Moved || touch.phase == TouchPhase.Stationary)
            {

                m_touchMovement += touch.deltaPosition;
              //  m_newSwipeDistance = m_touchMovement.magnitude;

                if (m_touchMovement.magnitude > m_minSwipeDistance)
                {
                    OnSwipe();
                    Diagnostic("Swipe detected", m_touchMovement.ToString() + " " + SwipeDiagnostic(m_touchMovement));
                }
                else if(m_touchMovement.magnitude < m_minSwipeDistance/6)
                {
                    m_touchMovement = Vector2.zero;
                }
            }
            else if (touch.phase == TouchPhase.Ended)
            {
                OnSwipeEnd();
            }
        }
    }

}