// ***********************************************************
// Written by Heyworks Unity Studio http://unity.heyworks.com/
// ***********************************************************
using UnityEngine;
/// <summary>
/// Gyroscope controller that works with any device orientation.
/// </summary>
public class AndroidMove : MonoBehaviour
{
	#region [Private fields]

	private bool gyroEnabled = true;
	private const float lowPassFilterFactor = 0.2f;

	private readonly Quaternion baseIdentity = Quaternion.Euler(90, 0, 0);
	private readonly Quaternion landscapeRight = Quaternion.Euler(0, 0, 90);
	private readonly Quaternion landscapeLeft = Quaternion.Euler(0, 0, -90);
	private readonly Quaternion upsideDown = Quaternion.Euler(0, 0, 180);

	private Quaternion cameraBase = Quaternion.identity;
	private Quaternion calibration = Quaternion.identity;
	private Quaternion baseOrientation = Quaternion.Euler(90, 0, 0);
	private Quaternion baseOrientationRotationFix = Quaternion.identity;
	private Quaternion referanceRotation = Quaternion.identity;
	private bool debug = true;
	private GameObject RotateObjectGame;

	#endregion

	#region [Unity events]

	protected void Start()
	{
		//	RotateObjectGame = gameObject;
		Input.gyro.enabled = true;
		AttachGyro();
		Invoke("GuiLing", 3f);
	}

	void GuiLing()
    {
		Debug.Log("this.transform.localEulerAngles.y"+ this.transform.localEulerAngles.y);
		this.transform.parent.transform.localEulerAngles = new Vector3(0, -this.transform.localEulerAngles.y, 0);
	}

	protected void Update()
	{
		if (!gyroEnabled)
			return;
		//transform.localRotation = Quaternion.Slerp(transform.localRotation,
		//							   cameraBase * (ConvertRotation(referanceRotation * Input.gyro.attitude) * GetRotFix()), lowPassFilterFactor);



		transform.localRotation = cameraBase * (ConvertRotation(referanceRotation * Input.gyro.attitude) * GetRotFix());
		//RotateObjectGame.transform.localEulerAngles = new Vector3 (0, 0, transform.localEulerAngles.y);
	}



	#endregion

	#region [Public methods]

	/// <summary>
	/// Attaches gyro controller to the transform.
	/// </summary>
	private void AttachGyro()
	{
		gyroEnabled = true;
		ResetBaseOrientation();
		UpdateCalibration(true);
		UpdateCameraBaseRotation(true);
		RecalculateReferenceRotation();
	}

	/// <summary>
	/// Detaches gyro controller from the transform
	/// </summary>
	private void DetachGyro()
	{
		gyroEnabled = false;
	}

	#endregion

	#region [Private methods]

	/// <summary>
	/// Update the gyro calibration.
	/// </summary>
	private void UpdateCalibration(bool onlyHorizontal)
	{
		if (onlyHorizontal)
		{
			var fw = (Input.gyro.attitude) * (-Vector3.forward);
			fw.z = 0;
			if (fw == Vector3.zero)
			{
				calibration = Quaternion.identity;
			}
			else
			{
				calibration = (Quaternion.FromToRotation(baseOrientationRotationFix * Vector3.up, fw));
			}
		}
		else
		{
			calibration = Input.gyro.attitude;
		}
	}

	/// <summary>
	/// Update the camera base localRotation.
	/// </summary>
	/// <param name='onlyHorizontal'>
	/// Only y localRotation.
	/// </param>
	private void UpdateCameraBaseRotation(bool onlyHorizontal)
	{
		if (onlyHorizontal)
		{
			var fw = transform.forward;
			fw.y = 0;
			if (fw == Vector3.zero)
			{
				cameraBase = Quaternion.identity;
			}
			else
			{
				cameraBase = Quaternion.FromToRotation(Vector3.forward, fw);
			}
		}
		else
		{
			cameraBase = transform.localRotation;
		}
	}

	/// <summary>
	/// Converts the localRotation from right handed to left handed.
	/// </summary>
	/// <returns>
	/// The result localRotation.
	/// </returns>
	/// <param name='q'>
	/// The localRotation to convert.
	/// </param>
	private static Quaternion ConvertRotation(Quaternion q)
	{
		return new Quaternion(q.x, q.y, -q.z, -q.w);
	}

	/// <summary>
	/// Gets the rot fix for different orientations.
	/// </summary>
	/// <returns>
	/// The rot fix.
	/// </returns>
	private Quaternion GetRotFix()
	{
#if UNITY_3_5
		if (Screen.orientation == ScreenOrientation.Portrait)
			return Quaternion.identity;
		
		if (Screen.orientation == ScreenOrientation.LandscapeLeft || Screen.orientation == ScreenOrientation.Landscape)
			return landscapeLeft;
				
		if (Screen.orientation == ScreenOrientation.LandscapeRight)
			return landscapeRight;
				
		if (Screen.orientation == ScreenOrientation.PortraitUpsideDown)
			return upsideDown;
		return Quaternion.identity;
#else
		return Quaternion.identity;
#endif
	}

	/// <summary>
	/// Recalculates reference system.
	/// </summary>
	private void ResetBaseOrientation()
	{
		baseOrientationRotationFix = GetRotFix();
		baseOrientation = baseOrientationRotationFix * baseIdentity;
	}

	/// <summary>
	/// Recalculates reference localRotation.
	/// </summary>
	private void RecalculateReferenceRotation()
	{
		referanceRotation = Quaternion.Inverse(baseOrientation) * Quaternion.Inverse(calibration);
	}

	#endregion
}