#region License Information (GPL v3)

/*
    ShareX - A program that allows you to take screenshots and share any file type
    Copyright (c) 2007-2024 ShareX Team

    This program 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 2
    of the License, or (at your option) any later version.

    This program 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 this program; if not, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

    Optionally you can also view the license at <http://www.gnu.org/licenses/>.
*/

#endregion License Information (GPL v3)

using System;
using System.Threading;

namespace ShareX.HelpersLib
{
    public class ThreadWorker
    {
        public event Action DoWork;
        public event Action Completed;

        private SynchronizationContext context;
        private Thread thread;

        public ThreadWorker()
        {
            context = SynchronizationContext.Current ?? new SynchronizationContext();
        }

        public void Start(ApartmentState state = ApartmentState.MTA)
        {
            if (thread == null)
            {
                thread = new Thread(WorkThread);
                thread.IsBackground = true;
                thread.SetApartmentState(state);
                thread.Start();
            }
        }

        private void WorkThread()
        {
            OnDoWork();
            OnCompleted();
        }

        private void OnDoWork()
        {
            DoWork?.Invoke();
        }

        private void OnCompleted()
        {
            if (Completed != null)
            {
                InvokeAsync(Completed);
            }
        }

        public void Invoke(Action action)
        {
            context.Send(state => action(), null);
        }

        public void InvokeAsync(Action action)
        {
            context.Post(state => action(), null);
        }
    }
}