using NSubstitute;
using TeleWave.Application.Common.Interfaces;
using TeleWave.Application.Notifications;
using TeleWave.Application.Tests.Support;
using TeleWave.Domain.Broadcast;
using TeleWave.Domain.Notifications;
using Xunit;

namespace TeleWave.Application.Tests.Notifications;

/// <summary>
/// Разговор с ботом. Главное свойство — подписаться можно только по одноразовому коду: рассылка
/// уходит в личные чаты, и «кто нашёл бота, тот и подписался» здесь означало бы чужие оповещения.
/// </summary>
public class TelegramBotTests
{
    private static readonly DateTimeOffset Now = new(2026, 8, 1, 12, 0, 0, TimeSpan.Zero);

    private static TelegramSettings Settings()
    {
        var settings = TelegramSettings.CreateDefault();
        settings.Update(
            new TelegramSettingsUpdate(
                true,
                TelegramTransport.Polling,
                "123:ABC",
                null,
                TelegramProxyKind.None,
                null,
                null,
                null,
                null
            )
        );
        return settings;
    }

    private static TelegramUpdate Message(long chatId, string text) =>
        new(1, chatId, text, "viewer", null, null, null);

    private static TelegramUpdate Callback(long chatId, string data) =>
        new(2, chatId, null, "viewer", "cb-1", data, 55);

    [Fact]
    public async Task Start_WithoutCode_DoesNotSubscribeAnyone()
    {
        var fixture = new TestDb();
        var api = Substitute.For<ITelegramApi>();

        await using var db = fixture.New();
        await new TelegramBotService(db, api).HandleAsync(
            Settings(),
            Message(100, "/start"),
            Now,
            CancellationToken.None
        );

        Assert.Empty(db.TelegramSubscribers);
        // Незнакомцу объясняют, где взять код, а не молчат в ответ.
        await api.Received(1)
            .SendMessageAsync(
                Arg.Any<TelegramSettings>(),
                100,
                Arg.Is<string>(s => s.Contains("код")),
                null,
                Arg.Any<CancellationToken>()
            );
    }

    [Fact]
    public async Task Start_WithCode_LinksChatToUserAndBurnsCode()
    {
        var fixture = new TestDb();
        var userId = Guid.NewGuid();
        var code = TelegramLinkCode.Issue("abc123", userId, Now);
        var channel = Channel.Create("Мультреалити", "mult", Now);
        channel.UpdateSettings(channel.Name, isEnabled: true, null);

        await using (var seed = fixture.New())
        {
            seed.TelegramLinkCodes.Add(code);
            seed.Channels.Add(channel);
            await seed.SaveChangesAsync(CancellationToken.None);
        }

        await using var db = fixture.New();
        await new TelegramBotService(db, Substitute.For<ITelegramApi>()).HandleAsync(
            Settings(),
            Message(100, "/start abc123"),
            Now,
            CancellationToken.None
        );

        var subscriber = Assert.Single(db.TelegramSubscribers);
        Assert.Equal(userId, subscriber.UserId);
        Assert.Equal(100, subscriber.ChatId);
        // Код одноразовый: ссылка оседает в истории браузера и в чате.
        Assert.NotNull(db.TelegramLinkCodes.Single().UsedAt);
    }

    [Fact]
    public async Task Start_WithUsedCode_IsRefused()
    {
        var fixture = new TestDb();
        var code = TelegramLinkCode.Issue("abc123", Guid.NewGuid(), Now);
        code.MarkUsed(Now);

        await using (var seed = fixture.New())
        {
            seed.TelegramLinkCodes.Add(code);
            await seed.SaveChangesAsync(CancellationToken.None);
        }

        await using var db = fixture.New();
        await new TelegramBotService(db, Substitute.For<ITelegramApi>()).HandleAsync(
            Settings(),
            Message(100, "/start abc123"),
            Now,
            CancellationToken.None
        );

        Assert.Empty(db.TelegramSubscribers);
    }

    [Fact]
    public async Task Callback_TogglesSubscriptionBothWays()
    {
        var fixture = new TestDb();
        var channel = Channel.Create("Мультреалити", "mult", Now);
        channel.UpdateSettings(channel.Name, isEnabled: true, null);
        var subscriber = TelegramSubscriber.Create(100, Guid.NewGuid(), "viewer", Now);

        await using (var seed = fixture.New())
        {
            seed.Channels.Add(channel);
            seed.TelegramSubscribers.Add(subscriber);
            await seed.SaveChangesAsync(CancellationToken.None);
        }

        var data = $"{channel.Id}:{TelegramNotificationKind.ShowStart}";

        await using (var db = fixture.New())
        {
            await new TelegramBotService(db, Substitute.For<ITelegramApi>()).HandleAsync(
                Settings(),
                Callback(100, data),
                Now,
                CancellationToken.None
            );
        }

        await using (var check = fixture.New())
        {
            Assert.Single(check.TelegramSubscriptions);
        }

        await using (var db = fixture.New())
        {
            await new TelegramBotService(db, Substitute.For<ITelegramApi>()).HandleAsync(
                Settings(),
                Callback(100, data),
                Now,
                CancellationToken.None
            );
        }

        await using var verify = fixture.New();
        // Повторное нажатие выключает: кнопка — тумблер, а не «добавить ещё одну подписку».
        Assert.Empty(verify.TelegramSubscriptions);
    }

    [Fact]
    public async Task Callback_FromUnknownChat_IsRefused()
    {
        var fixture = new TestDb();
        var api = Substitute.For<ITelegramApi>();

        await using var db = fixture.New();
        await new TelegramBotService(db, api).HandleAsync(
            Settings(),
            Callback(100, $"{Guid.NewGuid()}:{TelegramNotificationKind.ShowStart}"),
            Now,
            CancellationToken.None
        );

        Assert.Empty(db.TelegramSubscriptions);
    }
}