using Akari.Provider.WaveshareUART.Users;
using System.IO;
using System.Threading.Tasks;
using Terminal.Gui;
using WaveshareUARTFingerprintSensor;

namespace Akari.Provider.WaveshareUART.Views
{
    public class TUIManager : Toplevel
    {
        public const string SettingsFilePath = "settings.txt";

        public WaveshareUARTProvider Provider => WaveshareUARTProvider.Instance;
        public FingerprintSensor FingerprintSensor => Provider.FingerprintSensor;
        public UsersManager UsersManager => Provider.UsersManager;

        private Label _serialPortLabel;
        private Label _comparisonLevelLabel;
        private Label _userCountLabel;
        private bool _needToClear;

        public TUIManager()
        {
            Init();
        }

        private void Init()
        {
            ColorScheme = Colors.Error;

            // Creates the top-level window to show
            var win = new Window("TUIManager")
            {
                X = 0,
                Y = 1, // Leave one row for the toplevel menu

                // By using Dim.Fill(), it will automatically resize without manual intervention
                Width = Dim.Fill(),
                Height = Dim.Fill()
            };

            win.ColorScheme = Colors.ColorSchemes["Dialog"];

            Add(win);

            // Creates a menubar, the item "New" has a help menu.
            var menu = new MenuBar(new MenuBarItem[] {
                new MenuBarItem ("_Options", new MenuItem [] {
                    new MenuItem ("_Change Config", "", () => { ChangeConfig(); }),
                    new MenuItem ("_Quit", "", () => { Application.RequestStop(); })
                })
            });

            Add(menu);

            // Window Content
            _serialPortLabel = new Label("Serial Port:")
            {
                X = 2,
                Y = 1,
                Width = Dim.Fill()
            };
            _comparisonLevelLabel = new Label("Comparison Level: 0")
            {
                X = Pos.Left(_serialPortLabel),
                Y = Pos.Bottom(_serialPortLabel),
                Width = Dim.Fill()
            };
            _userCountLabel = new Label($"Users: {UsersManager.Count}")
            {
                X = Pos.Left(_comparisonLevelLabel),
                Y = Pos.Bottom(_comparisonLevelLabel),
                Width = Dim.Fill()
            };

            var manageUsersButton = new Button("_Manage Users")
            {
                X = Pos.Center(),
                Y = Pos.Center() - 1
            };
            manageUsersButton.Clicked += ManageUsersButton_Clicked;

            var setComparisonLevelButton = new Button("Set Comparison _Level")
            {
                X = Pos.Center(),
                Y = Pos.Bottom(manageUsersButton) + 1
            };
            setComparisonLevelButton.Clicked += SetComparisonLevelButton_Clicked;

            var quitButton = new Button("_Quit")
            {
                X = Pos.Center(),
                Y = Pos.Percent(95)
            };
            quitButton.Clicked += Quit_Clicked;

            win.Add(
                _serialPortLabel,
                _comparisonLevelLabel,
                _userCountLabel,
                manageUsersButton,
                setComparisonLevelButton,
                quitButton
            );

            // Init Sensor
            if (!File.Exists(SettingsFilePath))
            {
                _needToClear = true;

                Application.Run(new SettingsDisplay());
            }

            Provider.InitSensor();

            if (_needToClear)
            {
                if (!Provider.FingerprintSensor.DeleteAllUsers())
                {
                    MessageBox.ErrorQuery("Provider", "Can't clear registered fingerprints, check if the sensor is working correctly", "Ok");
                }

                _needToClear = false;
            }

            // Update gui
            UpdateSerialPort();
            UpdateUserCount();
            UpdateComparisonLevel();
        }

        private void UpdateSerialPort()
        {
            _serialPortLabel.Text = $"Serial Port: {FingerprintSensor.PortName}";
        }

        private void UpdateUserCount()
        {
            _userCountLabel.Text = $"Users: {UsersManager.Count}";
        }

        private void UpdateComparisonLevel()
        {
            if (FingerprintSensor.TryGetComparisonLevel(out byte comparisonLevel))
            {
                _comparisonLevelLabel.Text = $"Comparison Level: {comparisonLevel}";
            }
        }

        private void SetComparisonLevelButton_Clicked()
        {
            if (new EntryDialog("Comparison Level", i => int.TryParse(i.ToString(), out var n) && n > 0 && n < 10, "Need to be a valid number in 0-9 range").TryShow(out var input))
            {
                if (!FingerprintSensor.TrySetComparisonLevel(byte.Parse(input.ToString())))
                {
                    MessageBox.ErrorQuery("Comparison Level", "Can't set comparison level", "Ok");
                }
            }

            UpdateComparisonLevel();
        }

        private void AddUserButton_Clicked()
        {
            if (new EntryDialog("User id", i => ushort.TryParse(i.ToString(), out var n), "Need to be a valid user id").TryShow(out var input))
            {
                var dialog = new FingerprintDialog("Add Fingerprint", "Can't add fingerprint, try to place your finger flat on the sensor");

                Task.Run(() =>
                {
                    switch (FingerprintSensor.AddFingerprint(ushort.Parse(input.ToString()), UserPermission.Level1))
                    {
                        case ResponseType.Success:
                            dialog.Cancel();

                            Application.MainLoop.Invoke(() => MessageBox.Query("Add Fingerprint", "Successfully added fingerprint", "Ok"));

                            break;
                        case ResponseType.Full:
                            dialog.ErrorMessage = "Sensor full, can't add more users";

                            dialog.CancelAndShowError();

                            break;
                        case ResponseType.NoUser:
                            dialog.ErrorMessage = "Can't add fingerprint, invalid id";

                            dialog.CancelAndShowError();

                            break;
                        case ResponseType.FingerOccupied:
                            dialog.ErrorMessage = "Can't add fingerprint, finger already registered";

                            dialog.CancelAndShowError();

                            break;
                        case ResponseType.UserOccupied:
                            dialog.ErrorMessage = "Can't add fingerprint, id already used";

                            dialog.CancelAndShowError();

                            break;
                        default:
                            dialog.CancelAndShowError();
                            break;
                    }
                });

                dialog.Show();

                UpdateUserCount();
            }
        }

        private void ManageUsersButton_Clicked()
        {
            Application.Run(new ManageUsersDisplay());

            UpdateUserCount();
        }

        private void ChangeConfig()
        {
            File.Delete(SettingsFilePath);

            Application.Run(new SettingsDisplay());

            Provider.InitSensor();

            UpdateSerialPort();
        }

        private void Quit_Clicked()
        {
            Application.RequestStop();
        }
    }
}