using System.Diagnostics;
using System.Text;
using Azaion.CommonSecurity.DTO;
using Azaion.CommonSecurity.DTO.Commands;
using MessagePack;
using NetMQ;
using NetMQ.Sockets;

namespace Azaion.CommonSecurity.Services;

public interface IResourceLoader
{
    MemoryStream LoadFileFromPython(string fileName);
}

public interface IAuthProvider
{
    User CurrentUser { get; }
}


public class PythonResourceLoader : IResourceLoader, IAuthProvider
{
    private readonly ApiCredentials _credentials;
    private readonly AzaionApiClient _api;
    private readonly DealerSocket _dealer = new();
    private readonly Guid _clientId = Guid.NewGuid();

    public User CurrentUser { get; }

    public PythonResourceLoader(ApiConfig apiConfig, ApiCredentials credentials, AzaionApiClient api)
    {
        _credentials = credentials;
        _api = api;
        //StartPython(apiConfig, credentials);
        _dealer.Options.Identity = Encoding.UTF8.GetBytes(_clientId.ToString("N"));
        _dealer.Connect($"tcp://{SecurityConstants.ZMQ_HOST}:{SecurityConstants.ZMQ_PORT}");

        _dealer.SendFrame(MessagePackSerializer.Serialize(new RemoteCommand(CommandType.GetUser)));
        var user = _dealer.Get<User>();
        if (user == null)
            throw new Exception("Can't get user from Auth provider");

        CurrentUser = user;
    }

    private void StartPython( ApiConfig apiConfig, ApiCredentials credentials)
    {
        using var process = new Process();
        process.StartInfo = new ProcessStartInfo
        {
            FileName = SecurityConstants.AzaionInferencePath,
            Arguments = $"-e {credentials.Email} -p {credentials.Password} -f {apiConfig.ResourcesFolder}",
            UseShellExecute = false,
            RedirectStandardOutput = true,
            RedirectStandardError = true,
            //CreateNoWindow = true
        };

        process.OutputDataReceived += (_, e) => { if (e.Data != null) Console.WriteLine(e.Data); };
        process.ErrorDataReceived += (_, e) => { if (e.Data != null) Console.WriteLine(e.Data); };
        process.Start();
    }

    public async Task LoadFileFromApi(CancellationToken cancellationToken = default)
    {
        var hardwareService = new HardwareService();
        var hardwareInfo = hardwareService.GetHardware();

        var encryptedStream = await _api.GetResource("azaion_inference.exe", _credentials.Password, hardwareInfo, cancellationToken);

        var key = Security.MakeEncryptionKey(_credentials.Email, _credentials.Password, hardwareInfo.Hash);
        var stream = new MemoryStream();
        await encryptedStream.DecryptTo(stream, key, cancellationToken);
        stream.Seek(0, SeekOrigin.Begin);

    }

    public MemoryStream LoadFileFromPython(string fileName)
    {
        try
        {
            _dealer.SendFrame(MessagePackSerializer.Serialize(new RemoteCommand(CommandType.Load, fileName)));

            if (!_dealer.TryReceiveFrameBytes(TimeSpan.FromSeconds(3), out var bytes))
                throw new Exception($"Unable to receive {fileName}");

            return new MemoryStream(bytes);
        }
        catch (Exception ex)
        {
            throw new Exception($"Failed to load fil0e '{fileName}': {ex.Message}", ex);
        }
    }

}