/******************************************************************************
 * Copyright (C) Ultraleap, Inc. 2011-2021.                                   *
 *                                                                            *
 * Use subject to the terms of the Apache License 2.0 available at            *
 * http://www.apache.org/licenses/LICENSE-2.0, or another agreement           *
 * between Ultraleap and you, your company or other organization.             *
 ******************************************************************************/

using System.Collections.Generic;
using UnityEngine;

namespace Leap.Unity.Interaction
{

    [System.Serializable]
    public class AnchorSet : SerializableHashSet<Anchor> { }

    public class AnchorGroup : MonoBehaviour
    {

        [SerializeField]
        [Tooltip("The anchors that are within this AnchorGroup. Anchorable objects associated "
               + "this AnchorGroup can only be placed in anchors within this group.")]
        private AnchorSet _anchors = null;
        public AnchorSet anchors { get { return _anchors; } }

        private HashSet<AnchorableBehaviour> _anchorableObjects = new HashSet<AnchorableBehaviour>();
        /// <summary>
        /// Gets the AnchorableBehaviours that are set to this AnchorGroup.
        /// </summary>
        public HashSet<AnchorableBehaviour> anchorableObjects { get { return _anchorableObjects; } }

        void Awake()
        {
            foreach (var anchor in anchors)
            {
                Add(anchor);
            }
        }

        void OnDestroy()
        {
            foreach (var anchor in anchors)
            {
                anchor.groups.Remove(this);
            }
        }

        public bool Contains(Anchor anchor)
        {
            return _anchors.Contains(anchor);
        }

        public bool Add(Anchor anchor)
        {
            anchor.groups.Add(this);
            return _anchors.Add(anchor);
        }

        public bool Remove(Anchor anchor)
        {
            anchor.groups.Remove(this);
            return _anchors.Remove(anchor);
        }

        public void NotifyAnchorableObjectAdded(AnchorableBehaviour anchObj)
        {
            anchorableObjects.Add(anchObj);
        }

        public void NotifyAnchorableObjectRemoved(AnchorableBehaviour anchObj)
        {
            anchorableObjects.Remove(anchObj);
        }

    }

}