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

namespace AnotherReplayReader
{
    /// <summary>
    /// App.xaml 的交互逻辑
    /// </summary>
    public partial class App : Application
    {
        private int _isInException = 0;

        public const string Version = "0.7";
        public const string Name = "自动录像机";
        public const string NameWithVersion = Name + " v" + Version;

        private static readonly Lazy<string> _libsFolder = new(GetLibraryFolder, LazyThreadSafetyMode.PublicationOnly);
        public static string LibsFolder => _libsFolder.Value;

        public App()
        {
            static Assembly? LoadFromLibsFolder(object sender, ResolveEventArgs args)
            {
                var assemblyPath = Path.Combine(LibsFolder, new AssemblyName(args.Name).Name + ".dll");
                return File.Exists(assemblyPath)
                    ? Assembly.LoadFrom(assemblyPath)
                    : null;
            }
            AppDomain.CurrentDomain.AssemblyResolve += new ResolveEventHandler(LoadFromLibsFolder);

            AppDomain.CurrentDomain.UnhandledException += (sender, eventArgs) =>
            {
                if (Interlocked.Increment(ref _isInException) > 1)
                {
                    return;
                }
                Dispatcher.Invoke(() =>
                {
                    const string message = "哎呀呀，出现了一些无法处理的问题，只能退出了。要不要尝试保存一下日志文件呢？";
                    var choice = MessageBox.Show($"{message}\r\n{eventArgs.ExceptionObject}", Name, MessageBoxButton.YesNo);
                    if (choice == MessageBoxResult.Yes)
                    {
                        Debug.Instance.RequestSave();
                    }
                });
            };
        }

        private static string GetLibraryFolder() => Path.Combine(GetExecutableFolder(), nameof(AnotherReplayReader) + "Data");

        private static string GetExecutableFolder()
        {
            char[]? buffer = null;
            uint result;
            do
            {
                buffer = new char[(buffer?.Length ?? 128) * 2];
                result = GetModuleFileNameW(IntPtr.Zero, buffer, buffer.Length);
                if (result is 0)
                {
                    throw new Exception("Failed to retrieve executable name");
                }
            }
            while (result >= buffer.Length);
            return Path.GetDirectoryName(new(buffer, 0, Array.IndexOf(buffer, '\0')));
        }

        [DllImport("Kernel32.dll", CallingConvention = CallingConvention.Winapi, CharSet = CharSet.Unicode, ExactSpelling = true, SetLastError = true)]
        private static extern uint GetModuleFileNameW(IntPtr module, char[] fileName, int size);
    }
}