using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Resources;
using System.Threading;
using System.Diagnostics;

namespace Project
{
    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
           
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.ThreadException += new System.Threading.ThreadExceptionEventHandler(Application_ThreadException);
            AppDomain.CurrentDomain.UnhandledException += new UnhandledExceptionEventHandler(CurrentDomain_UnhandledException);
            if (CheckSingleInstance() == false) return;
            PUB.initCore();
            Application.Run(new fMain());
        }
      
        static void CurrentDomain_UnhandledException(object sender, UnhandledExceptionEventArgs e)
        {
            string emsg = "Fatal Error(UHE)\n\n" + e.ExceptionObject.ToString();
            PUB.log_[0].AddE(emsg);
            PUB.log_[0].Flush();
            PUB.log_[1].AddE(emsg);
            PUB.log_[1].Flush();
            Util.SaveBugReport(emsg);
            Shutdown();
            var f = new fErrorException(emsg);
            f.ShowDialog();
            Application.ExitThread();
        }

        /// <summary>
        /// Check for duplicate execution prevention
        /// </summary>
        /// <returns>true if single instance, false if duplicate execution</returns>
        static bool CheckSingleInstance()
        {
            string processName = Process.GetCurrentProcess().ProcessName;
            Process[] processes = Process.GetProcessesByName(processName);

            if (processes.Length > 1)
            {
                // 중복실행 감지
                string message = $"⚠️ {Application.ProductName} program is already running!\n\n" +
                                "Cannot run multiple programs simultaneously.\n\n" +
                                "Please select a solution:";

                var result = MessageBox.Show(message + "\n\nYes(Y): Terminate existing program and start new\nNo(N): Cancel current execution",
                                           "Duplicate Execution Detected",
                                           MessageBoxButtons.YesNo,
                                           MessageBoxIcon.Warning);

                if (result == DialogResult.Yes)
                {
                    // 기존 프로세스들을 종료
                    try
                    {
                        int currentProcessId = Process.GetCurrentProcess().Id;
                        foreach (Process process in processes)
                        {
                            if (process.Id != currentProcessId)
                            {
                                process.Kill();
                                process.WaitForExit(3000); // 3초 대기
                            }
                        }

                        // 잠시 대기 후 계속 진행
                        Thread.Sleep(1000);
                        return true;
                    }
                    catch (Exception ex)
                    {
                        MessageBox.Show($"An error occurred while terminating the existing program:\n{ex.Message}\n\n" +
                                       "Please terminate manually in Task Manager.",
                                       "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                        return false;
                    }
                }
                else
                {
                    // 현재 실행을 취소
                    return false;
                }
            }

            return true; // 단일 인스턴스
        }



        static void Shutdown()
        {
            PUB.log_[0].Add("Program Close");
            PUB.log_[0].Flush();
            PUB.log_[1].Add("Program Close");
            PUB.log_[1].Flush();
        }

        static void Application_ThreadException(object sender, System.Threading.ThreadExceptionEventArgs e)
        {
            string emsg = "Fatal Error(ATE)\n\n" + e.Exception.ToString();
            PUB.log_[0].AddE(emsg);
            PUB.log_[0].Flush();
            PUB.log_[1].AddE(emsg);
            PUB.log_[1].Flush();
            AR.UTIL.SaveBugReport(emsg);
            Shutdown();
            var f = new fErrorException(emsg);
            f.ShowDialog();
            Application.ExitThread();
        }
    }
}