using System;
using System.Threading.Tasks;

using Avalonia;
using Avalonia.Controls.ApplicationLifetimes;
using Avalonia.Markup.Xaml;

using MathGame.ViewModels;
using MathGame.Views;
using MathGame.Services;

using SplashScreen.ViewModels;
using SplashScreen;

namespace MathGame;
public partial class App : Application
{
    public override void Initialize()
    {
        AvaloniaXamlLoader.Load(this);
    }

    public override async void OnFrameworkInitializationCompleted()
    {
        if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
        {
            var splashWindow = new Splash();
            var splashViewModel = new SplashViewModel();

            splashWindow.DataContext = splashViewModel;
            desktop.MainWindow = splashWindow;

            // do a tad bit of OOP by setting the delays before the try/catch block
            // so that we can use the variable where needed and have oen place to edit the values
            int delay = 500;
            int errorDelay = 3000;

            try
            {
                // give the system a moment to catch up (I have a slow computer)
                await Task.Delay(errorDelay, cancellationToken: splashViewModel.cancellationToken);

                // display application starting
                splashViewModel.StartupMessage = "Starting Application. . .Please Wait. . .";
                await Task.Delay(delay, cancellationToken: splashViewModel.cancellationToken);

                // display checking for config file
                splashViewModel.StartupMessage = "Checking For Config File. . .Please Wait. . .";

                // make a call to the json service to see if the config file exists
                // the json service will handle the creation of the config file if it doesn't exist
                var configFound = JsonService.CheckConfig();

                // check if the config file was found and successful
                if (!configFound.IsSuccess)
                {
                    // if not, display the error message and close the program
                    splashViewModel.StartupMessage = configFound.Message + ". . .Closing Program. . .";
                    await Task.Delay(errorDelay, cancellationToken: splashViewModel.cancellationToken);
                    Environment.Exit(0);
                }

                // if so, display success message and continue with the application
                splashViewModel.StartupMessage = configFound.Message + ". . .Please Wait. . .";
                await Task.Delay(delay, cancellationToken: splashViewModel.cancellationToken);

                // now we're going to check if we can open the file and obtain the information
                splashViewModel.StartupMessage = "Obtaining Config Information. . .Please Wait. . .";

                // set the call equal to a variable
                var configInfo = JsonService.GetAppInfo();

                // check if the call was successful
                if (!configInfo.IsSuccess)
                {
                    // if not, display the error message and close the program
                    splashViewModel.StartupMessage = $"{configInfo.Message}. . .Closing Program. . .";
                    await Task.Delay(errorDelay, cancellationToken: splashViewModel.cancellationToken);
                    Environment.Exit(0);
                }

                // if so, display success message and continue with the application
                splashViewModel.StartupMessage = "Config Information Gathered Successfully. . .Please Wait. . .";
                await Task.Delay(delay, cancellationToken: splashViewModel.cancellationToken);

                // display checking if the database exists
                // for now, we have no use for a database so we'll just leave this alone
                splashViewModel.StartupMessage = "Gathering Project Solutions and Workspaces. . .Please Wait. . .";
                await Task.Delay(delay, cancellationToken: splashViewModel.cancellationToken);

                /* Until we have a reason to create more things on application startup,
                 * we will just feed remaining foder information to the screen
                 */

                splashViewModel.StartupMessage = "Applying Application Styles. . .Please Wait. . .";
                await Task.Delay(delay, cancellationToken: splashViewModel.cancellationToken);

                splashViewModel.StartupMessage = "Launching Application. . .Please Wait. . .";
                await Task.Delay(delay, cancellationToken: splashViewModel.cancellationToken);
            }
            catch (TaskCanceledException)
            {
                splashWindow.Close();
                Environment.Exit(0);
                return;
            }

            var mainWindow = new MainWindow();
            var mainWindowViewModel = new MainWindowViewModel();

            mainWindow.DataContext = mainWindowViewModel;
            desktop.MainWindow = mainWindow;

            mainWindow.Show();
            splashWindow.Close();
        }

        base.OnFrameworkInitializationCompleted();
    }
}