/*
 * 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.
 */

#if USING_XR_MANAGEMENT && (USING_XR_SDK_OCULUS || USING_XR_SDK_OPENXR)
#define USING_XR_SDK
#endif

#if UNITY_2020_1_OR_NEWER
#define REQUIRES_XR_SDK
#endif

using System;
using System.Collections.Generic;
using UnityEngine;
using System.Runtime.InteropServices;
#if !USING_XR_SDK && !REQUIRES_XR_SDK
using Boundary = UnityEngine.Experimental.XR.Boundary;
#endif

/// <summary>
/// Provides access to the Oculus boundary system.
/// </summary>
public class OVRBoundary
{
	/// <summary>
	/// Specifies a tracked node that can be queried through the boundary system.
	/// </summary>
	public enum Node
	{
		HandLeft           = OVRPlugin.Node.HandLeft,  ///< Tracks the left hand node.
		HandRight          = OVRPlugin.Node.HandRight, ///< Tracks the right hand node.
		Head               = OVRPlugin.Node.Head,      ///< Tracks the head node.
	}

	/// <summary>
	/// Specifies a boundary type surface.
	/// </summary>
	public enum BoundaryType
	{
		[System.Obsolete("Deprecated. This enum value will not be supported in OpenXR", false)]
		OuterBoundary      = OVRPlugin.BoundaryType.OuterBoundary, ///< Outer boundary that closely matches the user's configured walls.
		PlayArea           = OVRPlugin.BoundaryType.PlayArea,      ///< Smaller convex area inset within the outer boundary.
	}

	/// <summary>
	/// Provides test results of boundary system queries.
	/// </summary>
	[System.Obsolete("Deprecated. This struct will not be supported in OpenXR", false)]
	public struct BoundaryTestResult
	{
		public bool IsTriggering;                              ///< Returns true if the queried test would violate and/or trigger the tested boundary types.
		public float ClosestDistance;                          ///< Returns the distance between the queried test object and the closest tested boundary type.
		public Vector3 ClosestPoint;                           ///< Returns the closest point to the queried test object.
		public Vector3 ClosestPointNormal;                     ///< Returns the normal of the closest point to the queried test object.
	}

	/// <summary>
	/// Returns true if the boundary system is currently configured with valid boundary data.
	/// </summary>
	public bool GetConfigured()
	{
		if (OVRManager.loadedXRDevice == OVRManager.XRDevice.Oculus)
			return OVRPlugin.GetBoundaryConfigured();
		else
		{
#if !USING_XR_SDK && !REQUIRES_XR_SDK
			return Boundary.configured;
#else
			return false;
#endif
		}
	}

	/// <summary>
	/// Returns the results of testing a tracked node against the specified boundary type.
	/// All points are returned in local tracking space shared by tracked nodes and accessible through OVRCameraRig's trackingSpace anchor.
	/// </summary>
	[System.Obsolete("Deprecated. This function will not be supported in OpenXR", false)]
	public OVRBoundary.BoundaryTestResult TestNode(OVRBoundary.Node node, OVRBoundary.BoundaryType boundaryType)
	{
		OVRPlugin.BoundaryTestResult ovrpRes = OVRPlugin.TestBoundaryNode((OVRPlugin.Node)node, (OVRPlugin.BoundaryType)boundaryType);

		OVRBoundary.BoundaryTestResult res = new OVRBoundary.BoundaryTestResult()
		{
			IsTriggering = (ovrpRes.IsTriggering == OVRPlugin.Bool.True),
			ClosestDistance = ovrpRes.ClosestDistance,
			ClosestPoint = ovrpRes.ClosestPoint.FromFlippedZVector3f(),
			ClosestPointNormal = ovrpRes.ClosestPointNormal.FromFlippedZVector3f(),
		};

		return res;
	}

	/// <summary>
	/// Returns the results of testing a 3d point against the specified boundary type.
	/// The test point is expected in local tracking space.
	/// All points are returned in local tracking space shared by tracked nodes and accessible through OVRCameraRig's trackingSpace anchor.
	/// </summary>
	[System.Obsolete("Deprecated. This function will not be supported in OpenXR", false)]
	public OVRBoundary.BoundaryTestResult TestPoint(Vector3 point, OVRBoundary.BoundaryType boundaryType)
	{
		OVRPlugin.BoundaryTestResult ovrpRes = OVRPlugin.TestBoundaryPoint(point.ToFlippedZVector3f(), (OVRPlugin.BoundaryType)boundaryType);

		OVRBoundary.BoundaryTestResult res = new OVRBoundary.BoundaryTestResult()
		{
			IsTriggering = (ovrpRes.IsTriggering == OVRPlugin.Bool.True),
			ClosestDistance = ovrpRes.ClosestDistance,
			ClosestPoint = ovrpRes.ClosestPoint.FromFlippedZVector3f(),
			ClosestPointNormal = ovrpRes.ClosestPointNormal.FromFlippedZVector3f(),
		};

		return res;
	}

	private static int cachedVector3fSize = Marshal.SizeOf(typeof(OVRPlugin.Vector3f));
	private static OVRNativeBuffer cachedGeometryNativeBuffer = new OVRNativeBuffer(0);
	private static float[] cachedGeometryManagedBuffer = new float[0];
	private List<Vector3> cachedGeometryList = new List<Vector3>();
	/// <summary>
	/// Returns an array of 3d points (in clockwise order) that define the specified boundary type.
	/// All points are returned in local tracking space shared by tracked nodes and accessible through OVRCameraRig's trackingSpace anchor.
	/// </summary>
	public Vector3[] GetGeometry(OVRBoundary.BoundaryType boundaryType)
	{
		if (OVRManager.loadedXRDevice != OVRManager.XRDevice.Oculus)
		{
#if !USING_XR_SDK && !REQUIRES_XR_SDK
			if (Boundary.TryGetGeometry(cachedGeometryList, (boundaryType == BoundaryType.PlayArea) ? Boundary.Type.PlayArea : Boundary.Type.TrackedArea))
			{
				Vector3[] arr = cachedGeometryList.ToArray();
				return arr;
			}
#endif
			Debug.LogError("This functionality is not supported in your current version of Unity.");
			return null;
		}

		int pointsCount = 0;
		if (OVRPlugin.GetBoundaryGeometry2((OVRPlugin.BoundaryType)boundaryType, IntPtr.Zero, ref pointsCount))
		{
			if (pointsCount > 0)
			{
				int requiredNativeBufferCapacity = pointsCount * cachedVector3fSize;
				if (cachedGeometryNativeBuffer.GetCapacity() < requiredNativeBufferCapacity)
					cachedGeometryNativeBuffer.Reset(requiredNativeBufferCapacity);

				int requiredManagedBufferCapacity = pointsCount * 3;
				if (cachedGeometryManagedBuffer.Length < requiredManagedBufferCapacity)
					cachedGeometryManagedBuffer = new float[requiredManagedBufferCapacity];

				if (OVRPlugin.GetBoundaryGeometry2((OVRPlugin.BoundaryType)boundaryType, cachedGeometryNativeBuffer.GetPointer(), ref pointsCount))
				{
					Marshal.Copy(cachedGeometryNativeBuffer.GetPointer(), cachedGeometryManagedBuffer, 0, requiredManagedBufferCapacity);

					Vector3[] points = new Vector3[pointsCount];

					for (int i = 0; i < pointsCount; i++)
					{
						points[i] = new OVRPlugin.Vector3f()
						{
							x = cachedGeometryManagedBuffer[3 * i + 0],
							y = cachedGeometryManagedBuffer[3 * i + 1],
							z = cachedGeometryManagedBuffer[3 * i + 2],
						}.FromFlippedZVector3f();
					}

					return points;
				}
			}
		}

		return new Vector3[0];
	}

	/// <summary>
	/// Returns a vector that indicates the spatial dimensions of the specified boundary type. (x = width, y = height, z = depth)
	/// </summary>
	public Vector3 GetDimensions(OVRBoundary.BoundaryType boundaryType)
	{
		if (OVRManager.loadedXRDevice == OVRManager.XRDevice.Oculus)
			return OVRPlugin.GetBoundaryDimensions((OVRPlugin.BoundaryType)boundaryType).FromVector3f();

		else
		{
#if !USING_XR_SDK && !REQUIRES_XR_SDK
			Vector3 dimensions;
			if (Boundary.TryGetDimensions(out dimensions, (boundaryType == BoundaryType.PlayArea) ? Boundary.Type.PlayArea : Boundary.Type.TrackedArea))
				return dimensions;
#endif
			return Vector3.zero;
		}
	}

	/// <summary>
	/// Returns true if the boundary system is currently visible.
	/// </summary>
	[System.Obsolete("Deprecated. This function will not be supported in OpenXR", false)]
	public bool GetVisible()
	{
		if (OVRManager.loadedXRDevice == OVRManager.XRDevice.Oculus)
			return OVRPlugin.GetBoundaryVisible();
		else
		{
#if !USING_XR_SDK && !REQUIRES_XR_SDK
			return Boundary.visible;
#else
			return false;
#endif
		}
	}

	/// <summary>
	/// Requests that the boundary system visibility be set to the specified value.
	/// The actual visibility can be overridden by the system (i.e., proximity trigger) or by the user (boundary system disabled)
	/// </summary>
	[System.Obsolete("Deprecated. This function will not be supported in OpenXR", false)]
	public void SetVisible(bool value)
	{
		if (OVRManager.loadedXRDevice == OVRManager.XRDevice.Oculus)
			OVRPlugin.SetBoundaryVisible(value);
		else
		{
#if !USING_XR_SDK && !REQUIRES_XR_SDK
			Boundary.visible = value;
#endif
		}
	}
}