using UnityEngine;
using System.Collections;
using GestureWorksCoreNET;
using GestureWorksCoreNET.Unity;

public class TouchClock : TouchObject {

protected GameObject AffineTransform;
    protected readonly string AffineTransformName = "GW Transform Context";
    protected Transform OriginalParentTransform;
        
    /// <summary>
    /// Starts the transform context. Call this before any value changes occur 
    /// if you want manipulations to start where the center of the gesture happens. 
    /// Important: you must use AffineTransform in the GestureUpdate as the point 
    /// of manipulation. 
    /// </summary>
    public void StartAffineTransform(Vector3 contextLocation){
        if (AffineTransform == null) {
            AffineTransform = new GameObject();
                AffineTransform.name = AffineTransformName;
                    AffineTransform.transform.position = contextLocation;   
        }       
            AffineTransform.transform.LookAt(Vector3.forward);
            OriginalParentTransform = this.transform.parent;
            this.transform.parent = null;
            AffineTransform.transform.parent = OriginalParentTransform;
            this.transform.parent = AffineTransform.transform;

    }
        
    /// <summary>
    /// Call this at the end of the contextual gesture manipulation.
    /// </summary>
    public void EndAffineTransform(){
                
        this.transform.parent = OriginalParentTransform;                
        AffineTransform.transform.parent = null;        
        Destroy(AffineTransform);               
    }
        

    public void NDrag(GestureEvent gEvent){
                
        MoveObjectInCameraPlane(gEvent);

        float cx = Mathf.Clamp(transform.position.x, -2.0f, 2.0f);
        float cy = Mathf.Clamp(transform.position.y, 0.0f, 2.0f);
        float cz = 0.0f;
        
        transform.position = new Vector3(cx, cy, cz);
    }
                
    public void NRotate(GestureEvent gEvent){

        float multiplier = 0.75f;
                
        Camera cam = Camera.main;
                
        float dTheta = gEvent.Values["rotate_dtheta"]*multiplier;
                
        float screenX = gEvent.X;
        float screenY = cam.GetScreenHeight() - gEvent.Y;
        float screenZ = cam.WorldToScreenPoint(this.transform.position).z;
        
        Vector3 touchLocation = cam.ScreenToWorldPoint(new Vector3(screenX, screenY, screenZ));
                
        StartAffineTransform(touchLocation);
                
            AffineTransform.transform.Rotate(0, 0, dTheta);
                
        EndAffineTransform();
                        
    }
                
    public void NScale(GestureEvent gEvent){
                        
        float multiplier = 0.5f;
        
        float scaleDX = gEvent.Values["scale_dsx"]*multiplier;
        float scaleDY = gEvent.Values["scale_dsy"]*multiplier;

        float cx = Mathf.Clamp(transform.localScale.x+scaleDX, 0.5f, 2f);
        float cy = Mathf.Clamp(transform.localScale.y+scaleDY, 0.5f, 2f);
        float cz = Mathf.Clamp(transform.localScale.z+scaleDY, 0.5f, 2f);
        
        transform.localScale = new Vector3(cx, cy, cz);
    }
                
    public void ThreeFingerTilt(GestureEvent gEvent){

        float multiplier = 1.0f;
                        
        Camera cam = Camera.main;
                
        float tiltDX = gEvent.Values["tilt_dx"]*multiplier;
        float tiltDY = gEvent.Values["tilt_dy"]*multiplier;
                
        float screenX = gEvent.X;
        float screenY = cam.GetScreenHeight() - gEvent.Y;
        float screenZ = cam.WorldToScreenPoint(this.transform.position).z;
        
        Vector3 touchLocation = cam.ScreenToWorldPoint(new Vector3(screenX, screenY, screenZ));
                
            StartAffineTransform(touchLocation);
                
                AffineTransform.transform.Rotate(Vector3.up * (tiltDX));
                AffineTransform.transform.Rotate(Vector3.right * tiltDY*-1);
                
            EndAffineTransform();
    }

}