using System.Windows;
using HC_APTBS.Infrastructure.Logging;
using HC_APTBS.Infrastructure.Pcan;
using HC_APTBS.Services;
using HC_APTBS.Services.Impl;
using HC_APTBS.ViewModels;
using Microsoft.Extensions.DependencyInjection;
using Peak.Can.Basic;

namespace HC_APTBS;

/// <summary>
/// Application entry-point and DI container host.
///
/// <para>
/// Registers all services, ViewModels, and the main window with
/// <see cref="ServiceCollection"/>, then resolves and shows <see cref="MainWindow"/>
/// on startup.  The container is disposed when the application exits.
/// </para>
/// </summary>
public partial class App : Application
{
    private ServiceProvider? _serviceProvider;

    protected override async void OnStartup(StartupEventArgs e)
    {
        base.OnStartup(e);

        var services = new ServiceCollection();
        ConfigureServices(services);
        _serviceProvider = services.BuildServiceProvider();

        // Initialise the ViewModel (loads pump IDs, starts refresh timer, connects CAN).
        var mainVm = _serviceProvider.GetRequiredService<MainViewModel>();
        await mainVm.InitialiseAsync();

        var window = _serviceProvider.GetRequiredService<MainWindow>();
        window.Show();
    }

    protected override void OnExit(ExitEventArgs e)
    {
        _serviceProvider?.Dispose();
        base.OnExit(e);
    }

    // ── Service registration ──────────────────────────────────────────────────

    private static void ConfigureServices(IServiceCollection services)
    {
        // ── Infrastructure ────────────────────────────────────────────────────
        services.AddSingleton<IAppLogger, AppLogger>();

        // PcanAdapter requires a channel handle and baudrate read from configuration.
        services.AddSingleton<ICanService>(sp =>
        {
            var cfg     = sp.GetRequiredService<IConfigurationService>();
            var logger  = sp.GetRequiredService<IAppLogger>();
            var channel = cfg.Bench.Channel;
            // Default to 500 kbps; the channel can switch at runtime via ICanService.SwitchBaudrate.
            return new PcanAdapter(channel, TPCANBaudrate.PCAN_BAUD_500K, logger);
        });

        services.AddSingleton<IKwpService, KwpService>();

        // ── Application services ──────────────────────────────────────────────
        services.AddSingleton<IConfigurationService, ConfigurationService>();
        services.AddSingleton<IBenchService, BenchService>();
        services.AddSingleton<IUnlockService, UnlockService>();
        services.AddSingleton<ICalibrationService, CalibrationService>();
        services.AddSingleton<IPdfService, PdfService>();
        services.AddSingleton<ILocalizationService, LocalizationService>();

        // ── ViewModels ────────────────────────────────────────────────────────
        services.AddSingleton<MainViewModel>();

        // ── Views ─────────────────────────────────────────────────────────────
        services.AddSingleton<MainWindow>();
    }
}