using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Text.Json.Serialization;
using System.Threading.Tasks;
using Avalonia.Controls;
using Avalonia.Controls.ApplicationLifetimes;
using Avalonia.Markup.Xaml;
using Avalonia.Styling;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using NLog;
using NLog.Config;
using NLog.Extensions.Logging;
using NLog.Targets;
using Octokit;
using Polly;
using Polly.Contrib.WaitAndRetry;
using Polly.Extensions.Http;
using Polly.Timeout;
using Refit;
using StabilityMatrix.Avalonia.Services;
using StabilityMatrix.Avalonia.ViewModels;
using StabilityMatrix.Avalonia.Views;
using StabilityMatrix.Core.Api;
using StabilityMatrix.Core.Database;
using StabilityMatrix.Core.Helper;
using StabilityMatrix.Core.Helper.Cache;
using StabilityMatrix.Core.Helper.Factory;
using StabilityMatrix.Core.Models.Configs;
using StabilityMatrix.Core.Models.Packages;
using StabilityMatrix.Core.Python;
using StabilityMatrix.Core.Services;
using Application = Avalonia.Application;
using LogLevel = Microsoft.Extensions.Logging.LogLevel;

namespace StabilityMatrix.Avalonia;

public partial class App : Application
{
    public static IServiceProvider Services { get; set; } = null!;
    
    
    public override void Initialize()
    {
        AvaloniaXamlLoader.Load(this);
        
        // Set design theme
        if (Design.IsDesignMode)
        {
            RequestedThemeVariant = ThemeVariant.Dark;
        }
    }

    public override void OnFrameworkInitializationCompleted()
    {
        ConfigureServiceProvider();
        
        var mainViewModel = Services.GetRequiredService<MainWindowViewModel>();
        var notificationService = Services.GetRequiredService<INotificationService>();
        
        if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
        {
            var mainWindow = Services.GetRequiredService<MainWindow>();
            mainWindow.DataContext = mainViewModel;
            mainWindow.NotificationService = notificationService;
            desktop.MainWindow = mainWindow;
        }

        base.OnFrameworkInitializationCompleted();
    }
    
    private static void ConfigureServiceProvider()
    {
        var services = ConfigureServices();
        Services = services.BuildServiceProvider();
        Services.GetRequiredService<ISettingsManager>().TryFindLibrary();
    }
    
    private static IServiceCollection ConfigureServices()
    {
        var services = new ServiceCollection();

        services.AddMemoryCache();
        services.AddSingleton<PackageManagerViewModel>();
        services.AddSingleton<SettingsViewModel>();
        services.AddSingleton<CheckpointBrowserViewModel>();
        services.AddSingleton<CheckpointBrowserCardViewModel>();

        services.AddSingleton<ISettingsManager, SettingsManager>();
        services.AddSingleton<IPackageFactory, PackageFactory>();
        services.AddSingleton<IDownloadService, DownloadService>();
        services.AddSingleton<IGithubApiCache, GithubApiCache>();
        services.AddSingleton<IPrerequisiteHelper, PrerequisiteHelper>();
        services.AddSingleton<INotificationService, NotificationService>();
        
        services.AddSingleton<BasePackage, A3WebUI>();
        services.AddSingleton<BasePackage, VladAutomatic>();
        services.AddSingleton<BasePackage, ComfyUI>();
        services.AddSingleton<IPyRunner, PyRunner>();
        
        services.AddSingleton<LaunchPageViewModel>(s =>
            new LaunchPageViewModel(s.GetRequiredService<ILogger<LaunchPageViewModel>>(),
                s.GetRequiredService<ISettingsManager>(), s.GetRequiredService<IPackageFactory>(),
                s.GetRequiredService<IPyRunner>()));
        services.AddSingleton<PackageManagerViewModel>(s =>
            new PackageManagerViewModel(s.GetRequiredService<ISettingsManager>(),
                s.GetRequiredService<IPackageFactory>()));
		services.AddSingleton<MainWindowViewModel>(provider => new MainWindowViewModel
        	{
            	Pages = new List<PageViewModelBase>
            	{
	                provider.GetRequiredService<LaunchPageViewModel>(),
                	provider.GetRequiredService<PackageManagerViewModel>(),
                    provider.GetRequiredService<CheckpointBrowserViewModel>()
	            },
                FooterPages = new List<PageViewModelBase>
                {
                    provider.GetRequiredService<SettingsViewModel>()
                }
        	});
        
        services.AddTransient<LaunchPageView>();
        services.AddTransient<PackageManagerPage>();
        services.AddTransient<SettingsPage>();
        services.AddTransient<CheckpointBrowserPage>();
        services.AddSingleton<MainWindow>();
        
        services.AddSingleton<ILiteDbContext, LiteDbContext>();
        
        services.AddTransient<IGitHubClient, GitHubClient>(_ =>
        {
            var client = new GitHubClient(new ProductHeaderValue("StabilityMatrix"));
            // var githubApiKey = Config["GithubApiKey"];
            // if (string.IsNullOrWhiteSpace(githubApiKey))
            //     return client;
            //
            // client.Credentials = new Credentials(githubApiKey);
            return client;
        });
        
        // Configure Refit and Polly
            var defaultSystemTextJsonSettings =
                SystemTextJsonContentSerializer.GetDefaultJsonSerializerOptions();
            defaultSystemTextJsonSettings.DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull;

            var defaultRefitSettings = new RefitSettings
            {
                ContentSerializer =
                    new SystemTextJsonContentSerializer(defaultSystemTextJsonSettings),
            };

            // HTTP Policies
            var retryStatusCodes = new[] {
                HttpStatusCode.RequestTimeout, // 408
                HttpStatusCode.InternalServerError, // 500
                HttpStatusCode.BadGateway, // 502
                HttpStatusCode.ServiceUnavailable, // 503
                HttpStatusCode.GatewayTimeout // 504
            };
            var delay = Backoff
                .DecorrelatedJitterBackoffV2(medianFirstRetryDelay: TimeSpan.FromMilliseconds(80), retryCount: 5);
            var retryPolicy = HttpPolicyExtensions
                .HandleTransientHttpError()
                .Or<TimeoutRejectedException>()
                .OrResult(r => retryStatusCodes.Contains(r.StatusCode))
                .WaitAndRetryAsync(delay);
            
            // Shorter timeout for local requests
            var localTimeout = Policy.TimeoutAsync<HttpResponseMessage>(TimeSpan.FromSeconds(3));
            var localDelay = Backoff
                .DecorrelatedJitterBackoffV2(medianFirstRetryDelay: TimeSpan.FromMilliseconds(50), retryCount: 3);
            var localRetryPolicy = HttpPolicyExtensions
                .HandleTransientHttpError()
                .Or<TimeoutRejectedException>()
                .OrResult(r => retryStatusCodes.Contains(r.StatusCode))
                .WaitAndRetryAsync(localDelay, onRetryAsync: (x, y) =>
                {
                    Debug.WriteLine("Retrying local request...");
                    return Task.CompletedTask;
                });
            
            // named client for update
            services.AddHttpClient("UpdateClient")
                .AddPolicyHandler(retryPolicy);

            // Add Refit clients
            services.AddRefitClient<ICivitApi>(defaultRefitSettings)
                .ConfigureHttpClient(c =>
                {
                    c.BaseAddress = new Uri("https://civitai.com");
                    c.Timeout = TimeSpan.FromSeconds(15);
                })
                .AddPolicyHandler(retryPolicy);

            // Add Refit client managers
            services.AddHttpClient("A3Client")
                .AddPolicyHandler(localTimeout.WrapAsync(localRetryPolicy));
        
        // Add logging
        services.AddLogging(builder =>
        {
            builder.ClearProviders();
            builder.AddFilter("Microsoft.Extensions.Http", LogLevel.Warning)
                .AddFilter("Microsoft", LogLevel.Warning)
                .AddFilter("System", LogLevel.Warning);
            builder.SetMinimumLevel(LogLevel.Debug);
            builder.AddNLog(ConfigureLogging());
        });
        
        return services;
    }
    
    private static LoggingConfiguration ConfigureLogging()
    {
        var logConfig = new LoggingConfiguration();

        var fileTarget = new FileTarget("logfile")
        {
            ArchiveOldFileOnStartup = true,
            FileName = "${specialfolder:folder=ApplicationData}/StabilityMatrix/app.log",
            ArchiveFileName = "${specialfolder:folder=ApplicationData}/StabilityMatrix/app.{#}.log",
            ArchiveNumbering = ArchiveNumberingMode.Rolling,
            MaxArchiveFiles = 2
        };
        var debugTarget = new DebuggerTarget("debugger") { Layout = "${message}" };
        logConfig.AddRule(NLog.LogLevel.Debug, NLog.LogLevel.Fatal, fileTarget);
        logConfig.AddRule(NLog.LogLevel.Trace, NLog.LogLevel.Fatal, debugTarget);

        LogManager.Configuration = logConfig;
        // Add Sentry to NLog if enabled
        if (true)
        {
            logConfig.AddSentry(o =>
            {
                o.InitializeSdk = false;
                o.Layout = "${message}";
                o.IncludeEventDataOnBreadcrumbs = true;
                o.BreadcrumbLayout = "${logger}: ${message}";
                // Debug and higher are stored as breadcrumbs (default is Info)
                o.MinimumBreadcrumbLevel = NLog.LogLevel.Debug;
                // Error and higher is sent as event (default is Error)
                o.MinimumEventLevel = NLog.LogLevel.Error;
            });
        }

        return logConfig;
    }
}