using System.Text.Json;
using DataModel;
using DataModel.Database.Common;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Processor;

using static UI_WinForms.Components.LoaderStart.LoaderAction;

namespace UI_WinForms;

internal static class Program
{
    internal static IServiceProvider? SERVICE_PROVIDER;
    
    internal static bool RestartMainApp = false;
    
    [STAThread]
    private static void Main()
    {
        ApplicationConfiguration.Initialize();
        Application.EnableVisualStyles();

        // Start the loader screen:
        var loader = new Loader();
        Application.Run(loader);

        // Check, if the user closes the loader screen:
        if (loader.DialogResult != DialogResult.OK)
            return;

        //
        // Create the DI system
        //
        var builder = new HostBuilder();
            
        //
        // Add services
        //
        builder.ConfigureServices((hostContext, serviceCollection) =>
        {
            if(loader.Result.Action is LOAD_PROJECT or CREATE_NEW_PROJECT)
                serviceCollection.AddDatabase(loader.Result.DataFile, true);
            else if(loader.Result.Action is IMPORT_JSON)
            {
                try
                {
                    serviceCollection.ImportDataAndAddDatabase(loader.Result.DataFile).ConfigureAwait(false).GetAwaiter().GetResult();
                }
                catch (JsonException e)
                {
                    MessageBox.Show($"The JSON file '{loader.Result.DataFile}' is invalid and cannot be imported: {e.Message}", "Invalid JSON file", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    Environment.Exit(100);
                }
                catch(Exception e)
                {
                    MessageBox.Show($"An error occurred while importing the JSON file '{loader.Result.DataFile}': {e.Message}", "Error while importing JSON file", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    Environment.Exit(101);
                }
            }
        });

        // Get the host out of the DI system:
        using (var host = builder.Build())
        {
            // Create a service scope:
            using (var scope = host.Services.CreateScope())
            {
                // Get a service provider:
                SERVICE_PROVIDER = scope.ServiceProvider;
                
                // Set the service provider to the processor:
                ProcessorMeta.ServiceProvider = SERVICE_PROVIDER;
            
                // Apply database migrations:
                using (var database = SERVICE_PROVIDER.GetRequiredService<DataContext>())
                    Setup.PerformDataMigration(database).Wait();

                // Start the app:
                do
                {
                    Processor.DeepL.ResetState();
                    Application.Run(new Main());
                } while (Program.RestartMainApp);
            }
        }
        
        // Tear down the setup:
        AppDomain.CurrentDomain.ProcessExit += (sender, eventArgs) => Setup.SETUP_MAINTENANCE.Dispose();
    }
}