using System.Diagnostics;

namespace MeetingAssistant.MeetingNotes;

internal static class MeetingMetadataDiagnosticRunner
{
    public static async Task<MeetingMetadataDiagnosticResult> RunAsync(
        string provider,
        DateTimeOffset startedAt,
        TimeSpan timeout,
        Func<CancellationToken, Task<MeetingMetadata?>> lookupAsync,
        string noMatchError,
        CancellationToken cancellationToken)
    {
        var stopwatch = Stopwatch.StartNew();
        try
        {
            var lookup = lookupAsync(cancellationToken);
            var metadata = timeout > TimeSpan.Zero
                ? await lookup.WaitAsync(timeout, cancellationToken)
                : await lookup.WaitAsync(cancellationToken);
            return new MeetingMetadataDiagnosticResult(
                provider,
                startedAt,
                metadata is not null,
                false,
                stopwatch.ElapsedMilliseconds,
                metadata,
                metadata is null ? noMatchError : null);
        }
        catch (TimeoutException exception)
        {
            return new MeetingMetadataDiagnosticResult(
                provider,
                startedAt,
                false,
                true,
                stopwatch.ElapsedMilliseconds,
                null,
                exception.Message);
        }
        catch (OperationCanceledException) when (cancellationToken.IsCancellationRequested)
        {
            throw;
        }
        catch (Exception exception)
        {
            return new MeetingMetadataDiagnosticResult(
                provider,
                startedAt,
                false,
                false,
                stopwatch.ElapsedMilliseconds,
                null,
                exception.Message);
        }
    }
}