using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

[Serializable]
public class SerializableSelection : ISelection, ISerializationCallbackReceiver
{
    public int Count
    {
        get { return m_Selection.Count; }
    }
    public void OnBeforeSerialize()
    {
        m_Keys = new List<int>(m_Selection).ToArray();
    }
    public void OnAfterDeserialize()
    {
        m_Selection.Clear();
        m_Selection.UnionWith(m_Keys);
    }
    public int single
    {
        get
        {
            int index = -1;
            if (Count == 1)
            {
                using (IEnumerator<int> enumerator = m_Selection.GetEnumerator())
                {
                    if (enumerator.MoveNext())
                        index = enumerator.Current;
                }
            }
            return index;
        }
    }
    public int any
    {
        get
        {
            int index = -1;
            if (Count > 0)
            {
                using (IEnumerator<int> enumerator = m_Selection.GetEnumerator())
                {
                    if (enumerator.MoveNext())
                        index = enumerator.Current;
                }
            }
            return index;
        }
    }
    public void Clear()
    {
        m_Selection.Clear();
    }
    public void BeginSelection()
    {
        m_TemporalSelection.Clear();
        m_SelectionInProgress = true;
    }
    public void EndSelection(bool select)
    {
        m_SelectionInProgress = false;
        if (select)
            m_Selection.UnionWith(m_TemporalSelection);
        else
            m_Selection.ExceptWith(m_TemporalSelection);
        m_TemporalSelection.Clear();
    }
    public void Select(int index, bool select)
    {
        if (select)
            selection.Add(index);
        else if (IsSelected(index))
            selection.Remove(index);
    }
    public bool IsSelected(int index)
    {
        return m_Selection.Contains(index) || m_TemporalSelection.Contains(index);
    }
    HashSet<int> selection
    {
        get
        {
            if (m_SelectionInProgress)
                return m_TemporalSelection;
            return m_Selection;
        }
    }
    IEnumerator<int> IEnumerable<int>.GetEnumerator()
    {
        return m_Selection.GetEnumerator();
    }
    IEnumerator IEnumerable.GetEnumerator()
    {
        return (IEnumerator)m_Selection.GetEnumerator();
    }
    [SerializeField]
    int[] m_Keys = new int[0];
    HashSet<int> m_Selection = new HashSet<int>();
    HashSet<int> m_TemporalSelection = new HashSet<int>();
    bool m_SelectionInProgress = false;
}