namespace MeetingAssistant.Notifications;

public sealed record AgentApprovalPrompt(string Title, string Message, TimeSpan Timeout);

public interface IAgentApprovalPromptService
{
    Task<bool> ConfirmAsync(AgentApprovalPrompt prompt, CancellationToken cancellationToken);
}

public sealed class NoopAgentApprovalPromptService : IAgentApprovalPromptService
{
    public Task<bool> ConfirmAsync(AgentApprovalPrompt prompt, CancellationToken cancellationToken) => Task.FromResult(false);
}

public sealed class AgentApprovalService
{
    private readonly IAgentApprovalPromptService prompts;
    private readonly ILogger<AgentApprovalService> logger;
    private readonly TimeSpan timeout;

    public AgentApprovalService(IAgentApprovalPromptService prompts, ILogger<AgentApprovalService> logger)
        : this(prompts, logger, TimeSpan.FromMinutes(10)) { }

    internal AgentApprovalService(IAgentApprovalPromptService prompts, ILogger<AgentApprovalService> logger, TimeSpan timeout)
    {
        this.prompts = prompts;
        this.logger = logger;
        this.timeout = timeout;
    }

    public async Task<bool> ConfirmAsync(string title, string message, CancellationToken cancellationToken)
    {
        using var deadline = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken);
        deadline.CancelAfter(timeout);
        try
        {
            var accepted = await prompts.ConfirmAsync(new AgentApprovalPrompt(title, message, timeout), deadline.Token)
                .WaitAsync(deadline.Token);
            cancellationToken.ThrowIfCancellationRequested();
            return accepted && !deadline.IsCancellationRequested;
        }
        catch (OperationCanceledException) when (!cancellationToken.IsCancellationRequested)
        {
            return false;
        }
        catch (Exception exception) when (exception is not OperationCanceledException)
        {
            logger.LogWarning(exception, "Could not obtain user approval for {Title}", title);
            return false;
        }
        finally
        {
            await deadline.CancelAsync();
        }
    }
}