using System.Diagnostics;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
using Azaion.Common;
using MessagePack;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using NetMQ;
using NetMQ.Sockets;


namespace Azaion.LoaderUI;

public partial class Login
{
    private readonly IAzaionApi _azaionApi;
    private readonly ILogger<Login> _logger;
    private readonly DirectoriesConfig? _dirConfig;

    public Login(IAzaionApi azaionApi, IOptions<DirectoriesConfig> directoriesConfig, ILogger<Login> logger)
    {
        _azaionApi = azaionApi;
        _logger = logger;
        _dirConfig = directoriesConfig.Value;
        InitializeComponent();
    }

    private void SetControlsStatus(bool isLoading)
    {
        LoginBtn.IsEnabled = !isLoading;
        TbEmail.IsEnabled = !isLoading;
        TbPassword.IsEnabled = !isLoading;
        LoginBtn.Cursor = isLoading ? Cursors.Wait : Cursors.Arrow;
        Cursor = isLoading ? Cursors.Wait : Cursors.Arrow;
    }

    private async void LoginClick(object sender, RoutedEventArgs e)
    {
        var creds = new ApiCredentials
        {
            Email = TbEmail.Text,
            Password = TbPassword.Password
        };
        if (string.IsNullOrWhiteSpace(creds.Email) || string.IsNullOrWhiteSpace(creds.Password))
            return;
        
        try
        {
            SetControlsStatus(isLoading: true);
            _azaionApi.Login(creds);
            Validate(creds);

            TbStatus.Foreground = Brushes.Black;
            var installerVersion = await GetInstallerVer();
            var localVersion = GetLocalVer();
            var credsEncrypted = Security.Encrypt(creds);

            if (installerVersion > localVersion)
            {
                TbStatus.Text = $"Updating from {localVersion} to {installerVersion}...";
                var (installerName, stream) = await _azaionApi.DownloadInstaller(_dirConfig?.SuiteInstallerDirectory ?? "");
                var localFileStream = new FileStream(installerName, FileMode.Create, FileAccess.Write);
                await stream.CopyToAsync(localFileStream);
                localFileStream.Close();
                stream.Close();
                Process.Start(new ProcessStartInfo
                {
                    FileName = "cmd.exe",
                    Arguments = $"/c updater.cmd {Process.GetCurrentProcess().Id} {installerName} {Constants.AZAION_SUITE_EXE} \"{credsEncrypted}\""
                });
            }
            else
            {
                TbStatus.Text = "Your version is up to date!";

                Process.Start(Constants.AZAION_SUITE_EXE, $"-c {credsEncrypted}");
                await Task.Delay(800);
                TbStatus.Text = "Loading...";
                while (!Process.GetProcessesByName(Constants.INFERENCE_EXE).Any())
                    await Task.Delay(500);
                await Task.Delay(1500);
            }

            Close();
        }
        catch (Exception exception)
        {
            _logger.LogError(exception, exception.Message);
            TbStatus.Foreground = Brushes.Red;
            TbStatus.Text = exception.Message;
            SetControlsStatus(isLoading: false);
        }
    }

    private void Validate(ApiCredentials creds)
    {
        var dealer = new DealerSocket();
        try
        {
            using var process = new Process();
            process.StartInfo = new ProcessStartInfo
            {
                FileName = Constants.EXTERNAL_LOADER_PATH,
                Arguments = $"--port {Constants.EXTERNAL_LOADER_PORT} --api {Constants.API_URL}",
                CreateNoWindow = true
            };
            process.Start();
            dealer.Options.Identity = Encoding.UTF8.GetBytes(Guid.NewGuid().ToString("N"));
            dealer.Connect($"tcp://{Constants.EXTERNAL_LOADER_HOST}:{Constants.EXTERNAL_LOADER_PORT}");

            var result = SendCommand(dealer, RemoteCommand.Create(CommandType.Login, creds));
            if (result.CommandType != CommandType.Ok)
                throw new Exception(result.Message);

            result = SendCommand(dealer, RemoteCommand.Create(CommandType.CheckResource));
            if (result.CommandType != CommandType.Ok)
                throw new Exception(result.Message);
        }
        catch (Exception e)
        {
            _logger.LogError(e, e.Message);
            throw;
        }
        finally
        {
            SendCommand(dealer, RemoteCommand.Create(CommandType.Exit));
            dealer.Close();
            dealer.Dispose();
        }
    }

    private RemoteCommand SendCommand(DealerSocket dealer, RemoteCommand command, int retryCount = 30, int retryDelayMs = 800)
    {
        try
        {
            dealer.SendFrame(MessagePackSerializer.Serialize(command));

            var tryNum = 0;
            while (tryNum++ < retryCount)
            {
                if (!dealer.TryReceiveFrameBytes(TimeSpan.FromMilliseconds(retryDelayMs), out var bytes))
                    continue;
                var res = MessagePackSerializer.Deserialize<RemoteCommand>(bytes);
                if (res.CommandType == CommandType.Error)
                    throw new Exception(res.Message);
                return res;
            }

            throw new Exception($"Sent {command} {retryCount} times, with wait time {retryDelayMs}ms for each call. No response from client.");
        }
        catch (Exception e)
        {
            _logger.LogError(e, e.Message);
            throw;
        }
    }
    
    private async Task<Version> GetInstallerVer()
    {
        TbStatus.Text = "Checking for the newer version...";
        var installerDir = string.IsNullOrWhiteSpace(_dirConfig?.SuiteInstallerDirectory)
            ? Constants.SUITE_FOLDER
            : _dirConfig.SuiteInstallerDirectory;
        var installerName = await _azaionApi.GetLastInstallerName(installerDir);
        var match = Regex.Match(installerName, @"\d+(\.\d+)+");
        if (!match.Success)
            throw new Exception($"Can't find version in {installerName}");
        return new Version(match.Value);
    }

    private Version GetLocalVer()
    {
        var localFileInfo = FileVersionInfo.GetVersionInfo(Constants.AZAION_SUITE_EXE);
        if (string.IsNullOrWhiteSpace(localFileInfo.ProductVersion))
            throw new Exception($"Can't find {Constants.AZAION_SUITE_EXE} and its version");
        return new Version(localFileInfo.FileVersion!);
    }

    private void CloseClick(object sender, RoutedEventArgs e) => Close();

    private void MainMouseMove(object sender, MouseEventArgs e)
    {
        if (e.OriginalSource is Button || e.OriginalSource is TextBox)
            return;

        if (e.LeftButton == MouseButtonState.Pressed)
            DragMove();
    }
}