using System.Linq;
using System.Runtime.InteropServices;
using System.Threading;
using Windows.Win32;
using Microsoft.AspNetCore.Builder;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;

namespace AMNet.Server;

public static class DllMain
{
    private const string WebAddress = "http://card.ppc.moe";

    private static WebApplication _app;

    static DllMain()
    {
        PInvoke.AllocConsole();
    }

    [UnmanagedCallersOnly(EntryPoint = "aime_io_get_api_version")]
    public static ushort GetApiVersion() => 0x0100;

    [UnmanagedCallersOnly(EntryPoint = "aime_io_init")]
    public static int Init()
    {
        var addresses = Config.ReadKey(Config.IOSection, "serverAddress", 1024, "http://+:6070").Split(';');

        _app = WebServer.BuildServer(addresses);

        CancellationTokenRegistration? cancellationRegistration = null;
        cancellationRegistration = _app.Lifetime.ApplicationStarted.Register(() =>
        {
            _app.Logger.LogInformation("AMNet Server ({gameId}) started successfully.", Config.GameId);
            _app.Logger.LogInformation("Visit {addr} from a mobile device on the same network to get started.", WebAddress);

            // ReSharper disable once AccessToModifiedClosure
            cancellationRegistration?.Dispose();
        });

        _app.RunAsync();
        return 0;
    }

    [UnmanagedCallersOnly(EntryPoint = "aime_io_nfc_poll")]
    public static int NfcPoll(byte unitNo)
    {
        // there's no polling here (handled by the webserver)
        return 0;
    }

    [UnmanagedCallersOnly(EntryPoint = "aime_io_nfc_get_aime_id")]
    public static int GetAimeId(byte unitNo, nint luid, nint luidSize)
    {
        if (unitNo != 0)
        {
            return 1;
        }

        var card = _app.Services.GetRequiredService<CardPresenter>().TakeActiveCard();
        if (card?.Expired != false)
        {
            return 1;
        }

        try
        {
            Marshal.Copy(card.Value, 0, luid, (int)luidSize);
            return 0;
        }
        finally
        {
            _app.Logger.LogInformation("Card read in: {0}", string.Join(" ", Enumerable.Range(0, 5).Select(x => card.OriginalValue.Substring(x * 4, 4))));
        }
    }

    [UnmanagedCallersOnly(EntryPoint = "aime_io_nfc_get_felica_id")]
    public static unsafe int GetFelicaId(byte unitNo, ulong* idm) => 1; // felica not supported

    [UnmanagedCallersOnly(EntryPoint = "aime_io_led_set_color")]
    public static void SetLedColour(byte unitNo, byte r, byte g, byte b)
    {
        // do nothing
    }
}