using MeetingAssistant;
using MeetingAssistant.Speakers;
using Microsoft.Extensions.Logging.Abstractions;
using Microsoft.Extensions.Options;

namespace MeetingAssistant.Tests;

public sealed class ResemblyzerWarmupHostedServiceTests
{
    [Fact]
    public async Task EnabledWarmupStartsWithoutBlockingApplicationStartup()
    {
        var encoder = new BlockingEncoder();
        var options = new MeetingAssistantOptions();
        options.SpeakerIdentification.Resemblyzer.Enabled = true;
        var service = new ResemblyzerWarmupHostedService(
            encoder,
            Options.Create(options),
            NullLogger<ResemblyzerWarmupHostedService>.Instance);

        await service.StartAsync(CancellationToken.None).WaitAsync(TimeSpan.FromSeconds(1));
        await encoder.WaitForWarmupAsync();

        await service.StopAsync(CancellationToken.None);

        Assert.True(encoder.CancellationObserved);
    }

    [Fact]
    public async Task DisabledWarmupDoesNotInvokeEncoder()
    {
        var encoder = new BlockingEncoder();
        var service = new ResemblyzerWarmupHostedService(
            encoder,
            Options.Create(new MeetingAssistantOptions()),
            NullLogger<ResemblyzerWarmupHostedService>.Instance);

        await service.StartAsync(CancellationToken.None);
        await service.StopAsync(CancellationToken.None);

        Assert.False(encoder.WarmupStarted);
    }

    private sealed class BlockingEncoder : IResemblyzerVoiceEncoder
    {
        private readonly TaskCompletionSource started = new(TaskCreationOptions.RunContinuationsAsynchronously);

        public bool WarmupStarted { get; private set; }

        public bool CancellationObserved { get; private set; }

        public Task<IReadOnlyList<float[]>> EncodeAsync(
            IReadOnlyList<byte[]> wavSamples,
            CancellationToken cancellationToken)
        {
            return Task.FromResult<IReadOnlyList<float[]>>([]);
        }

        public async Task WarmUpAsync(CancellationToken cancellationToken)
        {
            WarmupStarted = true;
            started.TrySetResult();
            try
            {
                await Task.Delay(Timeout.InfiniteTimeSpan, cancellationToken);
            }
            catch (OperationCanceledException) when (cancellationToken.IsCancellationRequested)
            {
                CancellationObserved = true;
            }
        }

        public Task WaitForWarmupAsync()
        {
            return started.Task.WaitAsync(TimeSpan.FromSeconds(1));
        }
    }
}