using System;
using System.Runtime.InteropServices;
using System.Windows;
using System.Windows.Threading;

namespace AutoUpdateEx
{
    /// <summary>
    /// App.xaml 的交互逻辑
    /// </summary>
    public partial class App : Application
    {
        [DllImport("user32", CharSet = CharSet.Unicode)]
        static extern IntPtr FindWindow(string cls, string win);
        [DllImport("user32")]
        static extern IntPtr SetForegroundWindow(IntPtr hWnd);
        [DllImport("user32")]
        static extern bool IsIconic(IntPtr hWnd);
        [DllImport("user32")]
        static extern bool OpenIcon(IntPtr hWnd);
        System.Threading.Mutex mutex;

        /// <summary>
        /// 程序入口
        /// </summary>
        public App()
        {
            DispatcherUnhandledException += App_DispatcherUnhandledException;
            Startup += new StartupEventHandler(App_Startup);
        }

        /// <summary>
        /// UI线程异常处理事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void App_DispatcherUnhandledException(object sender, DispatcherUnhandledExceptionEventArgs e)
        {
            Utils.LoggerHelper.WriteLogger(e.Exception.ToString());
        }

        /// <summary>
        /// 非UI线程异常处理事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void CurrentDomain_UnhandledException(object sender, UnhandledExceptionEventArgs e)
        {
            Utils.LoggerHelper.WriteLogger((e.ExceptionObject as Exception).ToString());
        }

        /// <summary>
        /// 程序启动初始化
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void App_Startup(object sender, StartupEventArgs e)
        {
            mutex = new System.Threading.Mutex(true, "AutoUpdateEx", out bool ret);
            if (!ret)
            {
                ActivateOtherWindow();
                Environment.Exit(0);
            }
            else
            {
                MainWindow _MainWindow = new MainWindow();
                _MainWindow.Show();
            }
        }

        /// <summary>
        /// 切换窗口
        /// </summary>
        private static void ActivateOtherWindow()
        {
            var other = FindWindow(null, "系统更新");
            if (other != IntPtr.Zero)
            {
                SetForegroundWindow(other);
                if (IsIconic(other))
                    OpenIcon(other);
            }
        }

        /// <summary>
        /// 启动事件
        /// </summary>
        /// <param name="e"></param>
        protected override void OnStartup(StartupEventArgs e)
        {
            base.OnStartup(e);
            System.Windows.Forms.Application.EnableVisualStyles();
        }
    }
}