using System.Text;
using Azaion.Common.Database;
using Azaion.Common.DTO.Config;
using Azaion.CommonSecurity;
using Azaion.CommonSecurity.DTO.Commands;
using Azaion.CommonSecurity.Services;
using MessagePack;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;

namespace Azaion.Common.Services;

public interface IInferenceService
{
    Task RunInference(List<string> mediaPaths, Func<AnnotationImage, Task> processAnnotation, CancellationToken detectToken = default);
    void StopInference();
}

public class InferenceService(ILogger<InferenceService> logger, [FromKeyedServices(SecurityConstants.EXTERNAL_INFERENCE_PATH)] IExternalClient externalClient, IOptions<AIRecognitionConfig> aiConfigOptions) : IInferenceService
{
    public async Task RunInference(List<string> mediaPaths, Func<AnnotationImage, Task> processAnnotation, CancellationToken detectToken = default)
    {
        var aiConfig = aiConfigOptions.Value;

        aiConfig.Paths = mediaPaths;
        externalClient.Send(RemoteCommand.Create(CommandType.Inference, aiConfig));

        while (!detectToken.IsCancellationRequested)
        {
            try
            {
                var bytes = externalClient.GetBytes(ct: detectToken);
                if (bytes == null)
                    throw new Exception("Can't get bytes from inference client");

                if (bytes.Length == 4 && Encoding.UTF8.GetString(bytes) == "DONE")
                    return;

                var annotationImage = MessagePackSerializer.Deserialize<AnnotationImage>(bytes, cancellationToken: detectToken);

                await processAnnotation(annotationImage);
            }
            catch (Exception e)
            {
                logger.LogError(e, e.Message);
                break;
            }
        }
    }

    public void StopInference()
    {
        externalClient.Send(RemoteCommand.Create(CommandType.StopInference));
    }
}