namespace GmRelay.E2E.Runner;

/// <summary>
/// Automates the first step of every Telegram E2E scenario:
/// create a supergroup, invite the GmRelay bot, and verify the bot responds to /start.
/// </summary>
public sealed class GroupSetupScenario
{
    private readonly TelegramUserClient _client;
    private readonly RunnerConfig _config;

    public GroupSetupScenario(TelegramUserClient client, RunnerConfig config)
    {
        _client = client;
        _config = config;
    }

    public async Task<ScenarioResult> RunAsync(CancellationToken cancellationToken = default)
    {
        var group = await _client.CreateGroupAsync(
            $"GmRelay E2E {DateTime.UtcNow:yyyyMMdd-HHmmss}",
            "Automated test group for GmRelay E2E suite.",
            cancellationToken);

        Console.WriteLine($"[scenario] created group id={group.Id} title='{group.Title}'");

        await _client.InviteBotToGroupAsync(group, _config.BotUsername, cancellationToken);
        Console.WriteLine($"[scenario] invited @{_config.BotUsername}");

        await _client.SendCommandAsync(group, "start", cancellationToken);
        var reply = await _client.WaitForBotReplyAsync(
            group,
            containsText: null,
            timeout: TimeSpan.FromSeconds(30),
            cancellationToken);

        if (reply is null)
            throw new InvalidOperationException("Bot did not reply to /start in the group.");

        Console.WriteLine($"[scenario] bot replied to /start (msg id={reply.id})");

        return new ScenarioResult(group, reply.id);
    }

    public async Task CleanupAsync(ScenarioResult result, CancellationToken cancellationToken = default)
    {
        try
        {
            await _client.DeleteGroupAsync(result.Group, cancellationToken);
            Console.WriteLine($"[scenario] deleted group id={result.Group.Id}");
        }
        catch (Exception ex)
        {
            Console.WriteLine($"[scenario] warning: failed to delete group id={result.Group.Id}: {ex.Message}");
        }
    }
}

public sealed record ScenarioResult(ChatGroup Group, int LastBotMessageId);