/* Copyright (C) 2009 Matthew Geyer
 * 
 * This file is part of UO Machine.
 * 
 * UO Machine is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * UO Machine is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with UO Machine.  If not, see <http://www.gnu.org/licenses/>. */

using System.Collections.Concurrent;
using System.Linq;
using ClassicAssist.UO.Objects.Gumps;

namespace ClassicAssist.UO.Objects
{
    public sealed class GumpCollection
    {
        private readonly ConcurrentDictionary<uint, Gump> _dictionary;

        public GumpCollection()
        {
            _dictionary = new ConcurrentDictionary<uint, Gump>();
        }

        public void Add( Gump gump )
        {
            bool result = _dictionary.AddOrUpdate( gump.ID, gump, ( k, v ) => gump ) != null;

            if ( result )
            {
                OnCollectionChanged();
            }
        }

        public bool Remove( uint id, int buttonId = 0 )
        {
            bool result = _dictionary.TryRemove( id, out Gump g );

            g?.OnResponse( buttonId, null );

            if ( result )
            {
                OnCollectionChanged();
            }

            return result;
        }

        public bool GetGump( uint id, out Gump gump )
        {
            return _dictionary.TryGetValue( id, out gump );
        }

        public bool FindGump( int serial, out Gump gump )
        {
            gump = _dictionary.Values.FirstOrDefault( g => g.Serial == serial );

            return gump != null;
        }

        public bool GetGumps( out Gump[] gumps )
        {
            gumps = null;

            if ( _dictionary.Values.Count == 0 )
            {
                return false;
            }

            gumps = _dictionary.Values.ToArray();

            return gumps.Length > 0;
        }

        public void Clear()
        {
            int previousCount = _dictionary.Count;

            _dictionary.Clear();

            if ( previousCount > 0 )
            {
                OnCollectionChanged();
            }
        }

        private void OnCollectionChanged()
        {
        }
    }
}