/*
 * 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 System;
using System.Collections.Generic;
using UnityEngine;

/// <summary>
/// Represents the semantic classification of a <see cref="OVRSceneAnchor"/>.
/// </summary>
/// <remarks>
/// Scene anchors can have one or more string labels associated with them that describes what the anchor represents,
/// such as COUCH, or DESK. See <see cref="OVRSceneManager.Classification"/> for a list of possible labels.
/// </remarks>
[DisallowMultipleComponent]
[RequireComponent(typeof(OVRSceneAnchor))]
public class OVRSemanticClassification : MonoBehaviour, IOVRSceneComponent
{
	private readonly List<string> _labels = new List<string>();

	/// <summary>
	/// A list of labels associated with an <see cref="OVRSceneAnchor"/>.
	/// </summary>
	/// <exception cref="ArgumentNullException"></exception>
	public IReadOnlyList<string> Labels => _labels;

	/// <summary>
	/// Searches <see cref="Labels"/> for the given <paramref name="label"/>.
	/// </summary>
	/// <remarks>
	/// This method performs a linear search over the <see cref="Labels"/>.
	/// </remarks>
	/// <param name="label">The label to find</param>
	/// <returns>Returns true if <paramref name="label"/> exists in <see cref="Labels"/>.</returns>
	public bool Contains(string label)
	{
		foreach (var item in _labels)
		{
			if (item == label)
			{
				return true;
			}
		}

		return false;
	}

	private void Awake()
	{
		if (GetComponent<OVRSceneAnchor>().Space.Valid)
		{
			((IOVRSceneComponent)this).Initialize();
		}
	}

	void IOVRSceneComponent.Initialize()
	{
		if (OVRPlugin.GetSpaceSemanticLabels(GetComponent<OVRSceneAnchor>().Space, out var labels))
		{
			_labels.Clear();
			_labels.AddRange(labels.Split(','));
		}
		else
		{
			OVRSceneManager.Development.LogWarning(nameof(OVRSemanticClassification),
				$"[{GetComponent<OVRSceneAnchor>().Uuid}] {nameof(OVRSceneAnchor)} has no semantic labels.");
		}
	}
}