using Microsoft.Extensions.Logging.Abstractions;
using Telegram.Bot.Exceptions;
using Telegram.Bot.Requests;
using Telegram.Bot.Requests.Abstractions;
using Volcanic.AgenticCore.Telegram.Rendering;
using Volcanic.AgenticCore.Telegram.Tests.Support;

namespace Volcanic.AgenticCore.Telegram.Tests;

public sealed class BotSetupServiceTests
{
    private static (BotSetupService Service, FakeBotClient Bot) Create(Action<IRequest>? onSend)
    {
        var bot = new FakeBotClient { OnSend = onSend };
        var options = new TelegramOptions
        {
            BotToken = "t",
            AllowedUserIds = [Updates.AllowedUser, 2002],
            ReconnectInitialDelay = TimeSpan.FromMilliseconds(5),
            ReconnectMaxDelay = TimeSpan.FromMilliseconds(20),
        };
        var sender = new TelegramSender(bot, NullLogger<TelegramSender>.Instance);
        return (new BotSetupService(bot, options, sender, NullLogger<BotSetupService>.Instance), bot);
    }

    [Fact]
    public async Task Online_goes_once_to_the_owner_after_setup_succeeds_on_the_second_try()
    {
        var getMeCalls = 0;
        var (service, bot) = Create(r =>
        {
            if (r is GetMeRequest && Interlocked.Increment(ref getMeCalls) == 1) throw FakeBotClient.NetworkDown();
        });

        await service.StartAsync(CancellationToken.None);
        await service.ExecuteTask!.WaitAsync(TimeSpan.FromSeconds(5));
        await service.StopAsync(CancellationToken.None);

        Assert.Equal(2, bot.Requests.OfType<GetMeRequest>().Count());
        var online = Assert.Single(bot.Sent);
        Assert.Equal(Updates.AllowedUser, online.ChatId.Identifier);
        Assert.Equal("🟢 Online.", online.Text);
    }

    [Fact]
    public async Task A_forbidden_online_message_is_not_retried_and_does_not_stop_the_service()
    {
        var (service, bot) = Create(r =>
        {
            if (r is SendMessageRequest) throw new ApiRequestException("Forbidden: bot can't initiate conversation with a user", 403);
        });

        await service.StartAsync(CancellationToken.None);
        await service.ExecuteTask!.WaitAsync(TimeSpan.FromSeconds(5));

        Assert.True(service.ExecuteTask.IsCompletedSuccessfully);
        Assert.Single(bot.Requests.OfType<SendMessageRequest>());
        Assert.Single(bot.Requests.OfType<GetMeRequest>());
        await service.StopAsync(CancellationToken.None);
    }

    [Fact]
    public async Task The_admins_chat_menu_also_lists_impersonate()
    {
        var bot = new FakeBotClient();
        var options = new TelegramOptions { BotToken = "t", AllowedUserIds = [Updates.AllowedUser], AdminUserId = 5005 };
        var service = new BotSetupService(bot, options, new TelegramSender(bot, NullLogger<TelegramSender>.Instance), NullLogger<BotSetupService>.Instance);

        await service.StartAsync(CancellationToken.None);
        await service.ExecuteTask!.WaitAsync(TimeSpan.FromSeconds(5));
        await service.StopAsync(CancellationToken.None);

        var menus = bot.Requests.OfType<SetMyCommandsRequest>().ToList();
        Assert.Equal(2, menus.Count);
        Assert.DoesNotContain(menus[0].Commands, c => c.Command == "impersonate");
        var admin = Assert.IsType<global::Telegram.Bot.Types.BotCommandScopeChat>(menus[1].Scope);
        Assert.Equal(5005, admin.ChatId.Identifier);
        Assert.Contains(menus[1].Commands, c => c.Command == "impersonate");
    }
}