/*
 *                     GNU AFFERO GENERAL PUBLIC LICENSE
 *                       Version 3, 19 November 2007
 *  Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
 *  Everyone is permitted to copy and distribute verbatim copies
 *  of this license document, but changing it is not allowed.
 */

using System;
using System.Diagnostics;
using System.Globalization;
using System.IO;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Threading;
using Avalonia;
using Avalonia.Controls.ApplicationLifetimes;
using Avalonia.Markup.Xaml;
using Avalonia.Media.Imaging;
using Avalonia.Platform;
using Avalonia.ThemeManager;
using Emgu.CV;
using UVtools.Core;
using UVtools.Core.FileFormats;
using UVtools.Core.Operations;
using UVtools.WPF.Extensions;
using UVtools.WPF.Structures;

namespace UVtools.WPF
{
    public class App : Application
    {
        public static IThemeSelector? ThemeSelector { get; set; }
        public static MainWindow MainWindow;
        public static FileFormat SlicerFile = null;

        public static AppVersionChecker VersionChecker { get; } = new AppVersionChecker();

        public override void Initialize()
        {
            AvaloniaXamlLoader.Load(this);
        }

        public override async void OnFrameworkInitializationCompleted()
        {
            if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
            {
                CultureInfo.DefaultThreadCurrentCulture = CultureInfo.InvariantCulture;
                CultureInfo.DefaultThreadCurrentUICulture = CultureInfo.InvariantCulture;

                UserSettings.Load();
                UserSettings.SetVersion();

                OperationProfiles.Load();

                ThemeSelector = Avalonia.ThemeManager.ThemeSelector.Create(Path.Combine(ApplicationPath, "Assets", "Themes"));
                ThemeSelector.LoadSelectedTheme(Path.Combine(UserSettings.SettingsFolder, "selected.theme"));
                if (ThemeSelector.SelectedTheme.Name == "UVtoolsDark" || ThemeSelector.SelectedTheme.Name == "Light")
                {
                    foreach (var theme in ThemeSelector.Themes)
                    {
                        if (theme.Name != "UVtoolsLight") continue;
                        theme.ApplyTheme();
                        break;
                    }
                }

                MainWindow = new MainWindow();

                try
                {
                    CvInvoke.CheckLibraryLoaded();
                }
                catch (Exception e)
                {
                    await MainWindow.MessageBoxError("UVtools can not run due lack of dependencies from cvextern/OpenCV\n" +
                                                     "Please build or install this dependencies in order to run UVtools\n" +
                                                     "Check manual or page at 'Requirements' section for help\n\n" +
                                                     "Additional information:\n" +
                                                     $"{e}", "UVtools can not run");
                    return;
                }
                

                desktop.MainWindow = MainWindow;
                desktop.Exit += (sender, e) 
                    => ThemeSelector.SaveSelectedTheme(Path.Combine(UserSettings.SettingsFolder, "selected.theme"));
            }

            base.OnFrameworkInitializationCompleted();
        }

        #region Utilities

        public static string AppExecutable = Path.Combine(ApplicationPath, About.Software);
        public static string AppExecutableQuoted = $"\"{AppExecutable}\"";
        public static void NewInstance(string filePath)
        {
            try
            {
                if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
                {
                    StartProcess($"{AppExecutable}.exe", $"\"{filePath}\"");
                }
                else if(File.Exists(AppExecutable)) // Direct execute
                {
                    StartProcess(AppExecutable, $"\"{filePath}\"");
                }
                else
                {
                    StartProcess("dotnet", $"UVtools.dll \"{filePath}\"");
                }
            }
            catch (Exception e)
            {
                Debug.WriteLine(e);
            }
        }

        public static void OpenBrowser(string url)
        {
            try
            {
                if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
                {
                    Process.Start(new ProcessStartInfo(url) { UseShellExecute = true }).Dispose();
                }
                else if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
                {
                    Process.Start("xdg-open", url).Dispose();
                }
                else if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
                {
                    Process.Start("open", url).Dispose();
                }
                else
                {
                    // throw 
                }
            }
            catch (Exception e)
            {
                Debug.WriteLine(e);
            }
            
        }

        public static void StartProcess(string name, string arguments = null)
        {
            try
            {
                using (Process.Start(new ProcessStartInfo(name, arguments)
                {
                    UseShellExecute = true
                })) { }
            }
            catch (Exception e)
            {
                Debug.WriteLine(e);
            }
        }

        public static Stream GetAsset(string url)
        {
            Uri uri;

            // Allow for assembly overrides
            if (url.StartsWith("avares://"))
            {
                uri = new Uri(url);
            }
            else
            {
                var assemblyName = Assembly.GetEntryAssembly().GetName().Name;
                uri = new Uri($"avares://{assemblyName}{url}");
            }

            var res = AvaloniaLocator.Current.GetService<IAssetLoader>().Open(uri);
            return res;
        }

        public static Bitmap GetBitmapFromAsset(string url) => new Bitmap(GetAsset(url));

        public static string ApplicationPath => Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);

        public static string GetPrusaSlicerDirectory()
        {
            if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
            {
                return $"{Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData)}{Path.DirectorySeparatorChar}PrusaSlicer";
            }

            if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
            {
                return $"{Environment.GetFolderPath(Environment.SpecialFolder.UserProfile)}{Path.DirectorySeparatorChar}.PrusaSlicer";
            }

            if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
            {
                return string.Format("{0}{1}Library{1}Application Support{1}PrusaSlicer",
                    Environment.GetFolderPath(Environment.SpecialFolder.UserProfile), Path.DirectorySeparatorChar);
            }

            return null;
        }

        #endregion
    }
}