using UnityEngine;
using System.Collections;
using devm.input;

[RequireComponent(typeof(Collider))]
public class JoyStick : MonoBehaviour {

    public float AngleMul = 5f;
    public float AngleLimits = 80f;

    TouchInput touchInput;
    Camera guiCamera;
    new Collider collider;

    float angle;
    int fingerId;
    Vector3 fingerDownAt;

    public float Power{
        get{
            float pow = angle / AngleLimits;

            if(Mathf.Abs(pow) < 0.25f)
                pow = 0f;

            return pow;
        }
    }


    // Use this for initialization
    void Start () {

        touchInput = Dependencies.Get<TouchInput>();
        guiCamera = GetComponentInParent<Camera>();
        collider  = GetComponent<Collider>();

        angle = 0f;
        fingerId = -1;
    }

    // Update is called once per frame
    void Update () {

        for(int i=0; i < touchInput.TouchCount; i++){

            TouchInput.TouchPoint touch = touchInput.Touches[i];


            if(touch.Phase == TouchPhase.Began)
            {

                Ray ray = guiCamera.ScreenPointToRay(touch.Position);
                RaycastHit hitinfo;

                if(collider.Raycast(ray, out hitinfo, 100f))
                {
                    fingerId = touch.FingerId;
                    fingerDownAt = touch.Position;
                }

            }
            else if(touch.FingerId == fingerId)
            {

                Vector3 fingerPos = touch.Position;

                Vector3 fingerDelta = fingerPos - fingerDownAt;

                angle = fingerDelta.y / (float)Screen.height;
                angle *= AngleMul;
                angle = Mathf.Clamp(angle, -AngleLimits, AngleLimits);
            }

            if(touch.Phase == TouchPhase.Ended && touch.FingerId == fingerId)
                fingerId = -1;
        }

        if(fingerId == -1)
        {
            //ease back

            angle *= 0.75f;
        }

        transform.localRotation = Quaternion.Euler(angle, 0f, 0f);

    }
}