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

namespace Leap.Unity
{

    [Serializable]
    public class EnumEventTable : ISerializationCallbackReceiver
    {

        [Serializable]
        private class Entry
        {

#pragma warning disable 0649
            [SerializeField]
            public int enumValue;

            [SerializeField]
            public UnityEvent callback;
#pragma warning restore 0649
        }

        //The actual serialized list of entries
        [SerializeField]
        private List<Entry> _entries = new List<Entry>();

        //Not serialized, is just populated after deserialization and used
        //when calling Invoke for speed.
        private Dictionary<int, UnityEvent> _entryMap = new Dictionary<int, UnityEvent>();

        public bool HasUnityEvent(int enumValue)
        {
            UnityEvent callback;
            if (_entryMap.TryGetValue(enumValue, out callback))
            {
                return callback.GetPersistentEventCount() > 0;
            }
            else
            {
                return false;
            }
        }

        public void Invoke(int enumValue)
        {
            UnityEvent callback;
            if (_entryMap.TryGetValue(enumValue, out callback))
            {
                callback.Invoke();
            }
        }

        public void OnBeforeSerialize() { }

        public void OnAfterDeserialize()
        {
            if (_entryMap == null)
            {
                _entryMap = new Dictionary<int, UnityEvent>();
            }
            else
            {
                _entryMap.Clear();
            }

            foreach (var entry in _entries)
            {
                _entryMap[entry.enumValue] = entry.callback;
            }
        }
    }
}