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using UnityEngine;
using System.Collections;

public class Orientation : MonoBehaviour {

	Vector3 pitchYawRoll{
		get{
			return new Vector3(pitch,yaw,roll);
		}
		set{
			transform.rotation = Quaternion.identity;
			Vector3 o = transform.position;
			transform.RotateAround (o,Vector3.forward,value.z);
			transform.RotateAround (o,Vector3.right,value.x);
			transform.RotateAround (o,Vector3.up,value.y);
		}
	}

	/**
	 * Pitch indicates whether a vehicle is pointing up or down.
	 * It is the angle between the forward vector and the horizontal
	 * plane.
	 */
	public float pitch{
		get{
			float sine = UnaryTrim(transform.forward.y);
			return -Mathf.Asin(sine)*Mathf.Rad2Deg;
		}
		set{ pitchYawRoll = new Vector3(value, yaw, roll); }
	} 

	/**
	 * Yaw is the angle between the forward vector's ground image
	 * and the forward/north direction.
	 * Yaw is the general 'direction' or 'course'.
	 * if a vehicle is pointing all the way up or down,
	 * we extract yaw from the right vector.
	 */
	public float yaw{
		get{
			Vector3 vector=Ground (transform.forward);
			if(vector.magnitude<0.5f){
				return EvalAltYaw();
			}
			float alpha = Vector3.Angle(vector,Vector3.forward);
			return vector.x>0?alpha:-alpha;
		}
		set{ pitchYawRoll = new Vector3(pitch, value, roll); }
	} 
	/**
	 * Roll is the angle between the right vector and its ground image.
	 */
	public float roll{

		get{
			float sine = UnaryTrim (transform.right.y);
			return Mathf.Asin(sine)*Mathf.Rad2Deg;
		}
		set{ pitchYawRoll = new Vector3(pitch, yaw, value); }
	} 

	public float attitude{
		get{return pitch;}
		set{pitch=value;}
	}

	public float heading{
		get{return yaw;}
		set{yaw=value;}
	}

	public float bank{
		get{return roll;}
		set{roll=value;}
	}

	// PRIVATE ---------------------------------------------------------

	/**
	 * Alternatively Yaw can be calculated as the angle
	 * between the ground projection of the right vector
	 * and the east/right direction.
	 * Even if a vehicle is pointing straight up or dawn,
	 * you can still tell it's course/direction looking at
	 * position of the wings/tyres.
	 */
	private float EvalAltYaw(){
		Vector3 vector=Ground(transform.right);
		float alpha = Vector3.Angle(vector,Vector3.right);
		return vector.z<0?alpha:-alpha;
	}
	
	private Vector3 Ground(Vector3 u){
		u.y=0.0f;
		return u;
	}

	private float UnaryTrim(float w){
		if( w >  1.0 ) return  1.0f;
		if( w < -1.0 ) return -1.0f;
		return w;
	}

}