/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 * All rights reserved.
 *
 * Licensed under the Oculus SDK License Agreement (the "License");
 * you may not use the Oculus SDK except in compliance with the License,
 * which is provided at the time of installation or download, or which
 * otherwise accompanies this software in either electronic or hard copy form.
 *
 * You may obtain a copy of the License at
 *
 * https://developer.oculus.com/licenses/oculussdk/
 *
 * Unless required by applicable law or agreed to in writing, the Oculus SDK
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

using UnityEngine;
using System.Collections;

/// <summary>
/// Diagnostic display with a regular grid of cubes for visual testing of
/// tracking and distortion.
/// </summary>
public class OVRGridCube : MonoBehaviour
{
	/// <summary>
	/// The key that toggles the grid of cubes.
	/// </summary>
	public KeyCode GridKey                     = KeyCode.G;

	private GameObject 	CubeGrid			   = null;

	private bool 	CubeGridOn		    	   = false;
	private bool 	CubeSwitchColorOld  	   = false;
	private bool 	CubeSwitchColor     	   = false;

	private int   gridSizeX  = 6;
	private int   gridSizeY  = 4;
	private int   gridSizeZ  = 6;
	private float gridScale  = 0.3f;
	private float cubeScale  = 0.03f;

	// Handle to OVRCameraRig
	private OVRCameraRig CameraController = null;

	/// <summary>
	/// Update this instance.
	/// </summary>
	void Update ()
	{
		UpdateCubeGrid();
	}

	/// <summary>
	/// Sets the OVR camera controller.
	/// </summary>
	/// <param name="cameraController">Camera controller.</param>
	public void SetOVRCameraController(ref OVRCameraRig cameraController)
	{
		CameraController = cameraController;
	}

	void UpdateCubeGrid()
	{
		//todo: enable for Unity Input System
#if ENABLE_LEGACY_INPUT_MANAGER
		// Toggle the grid cube display on 'G'
		if(Input.GetKeyDown(GridKey))
		{
			if(CubeGridOn == false)
			{
				CubeGridOn = true;
				Debug.LogWarning("CubeGrid ON");
				if(CubeGrid != null)
					CubeGrid.SetActive(true);
				else
					CreateCubeGrid();
			}
			else
			{
				CubeGridOn = false;
				Debug.LogWarning("CubeGrid OFF");

				if(CubeGrid != null)
					CubeGrid.SetActive(false);
			}
		}
#endif

		if (CubeGrid != null)
		{
			// Set cube colors to let user know if camera is tracking
			CubeSwitchColor = !OVRManager.tracker.isPositionTracked;

			if(CubeSwitchColor != CubeSwitchColorOld)
				CubeGridSwitchColor(CubeSwitchColor);
			CubeSwitchColorOld = CubeSwitchColor;
		}
	}

	void CreateCubeGrid()
	{
		Debug.LogWarning("Create CubeGrid");

		// Create the visual cube grid
		CubeGrid = new GameObject("CubeGrid");
		// Set a layer to target a specific camera
		CubeGrid.layer = CameraController.gameObject.layer;

		for (int x = -gridSizeX; x <= gridSizeX; x++)
			for (int y = -gridSizeY; y <= gridSizeY; y++)
				for (int z = -gridSizeZ; z <= gridSizeZ; z++)
			{
				// Set the cube type:
				// 0 = non-axis cube
				// 1 = axis cube
				// 2 = center cube
				int CubeType = 0;
				if ((x == 0 && y == 0) || (x == 0 && z == 0) || (y == 0 && z == 0))
				{
					if((x == 0) && (y == 0) && (z == 0))
						CubeType = 2;
					else
						CubeType = 1;
				}

				GameObject cube = GameObject.CreatePrimitive(PrimitiveType.Cube);

				BoxCollider bc = cube.GetComponent<BoxCollider>();
				bc.enabled = false;

				cube.layer = CameraController.gameObject.layer;

				// No shadows
				Renderer r = cube.GetComponent<Renderer>();

#if UNITY_4_0 || UNITY_4_1 || UNITY_4_2 || UNITY_4_3 || UNITY_4_5 || UNITY_4_6
				// Renderer.castShadows was deprecated starting in Unity 5.0
				r.castShadows    = false;
#else
				r.shadowCastingMode = UnityEngine.Rendering.ShadowCastingMode.Off;
#endif

				r.receiveShadows = false;

				// Cube line is white down the middle
				if (CubeType == 0)
					r.material.color = Color.red;
				else if (CubeType == 1)
					r.material.color = Color.white;
				else
					r.material.color = Color.yellow;

				cube.transform.position =
					new Vector3(((float)x * gridScale),
					            ((float)y * gridScale),
					            ((float)z * gridScale));

				float s = 0.7f;

				// Axis cubes are bigger
				if(CubeType == 1)
					s = 1.0f;
				// Center cube is the largest
				if(CubeType == 2)
					s = 2.0f;

				cube.transform.localScale =
					new Vector3(cubeScale * s, cubeScale * s, cubeScale * s);

				cube.transform.parent = CubeGrid.transform;
			}
	}

	/// <summary>
	/// Switch the Cube grid color.
	/// </summary>
	/// <param name="CubeSwitchColor">If set to <c>true</c> cube switch color.</param>
	void CubeGridSwitchColor(bool CubeSwitchColor)
	{
		Color c = Color.red;
		if(CubeSwitchColor == true)
			c = Color.blue;

		var cachedTransform = CubeGrid.transform;
		for (int i = 0; i < cachedTransform.childCount; i++)
		{
			var child = cachedTransform.GetChild(i);
			Material m = child.GetComponent<Renderer>().material;
			// Cube line is white down the middle
			if(m.color == Color.red || m.color == Color.blue)
				m.color = c;
		}
	}
}