using System;
using System.Collections.Generic;
using System.Data.SqlClient;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tango.Core;
using Tango.Core.Commands;
using Tango.Core.Helpers;
using Tango.Integration.Operation;
using Tango.Logging;
using Tango.PMR.Connection;
using Tango.PPC.Common;
using Tango.PPC.Common.Application;
using Tango.PPC.Common.MachineSetup;
using Tango.PPC.Common.Navigation;
using Tango.PPC.UI.ViewsContracts;
using Tango.Settings;
using Tango.SharedUI.Helpers;
using Tango.SQLExaminer;
using Tango.Transport.Adapters;

namespace Tango.PPC.UI.ViewModels
{
    /// <summary>
    /// Represents the machine setup view ViewModel.
    /// </summary>
    /// <seealso cref="Tango.PPC.Common.PPCViewModel{Tango.PPC.UI.ViewsContracts.IMachineSetupView}" />
    public class MachineSetupViewVM : PPCViewModel<IMachineSetupView>
    {
        /// <summary>
        /// Represents the various machine setup view states.
        /// </summary>
        public enum MachineSetupStates
        {
            None,
            Working,
            Completed,
            Failed,
        }

        public enum MachineSetupView
        {
            WelcomeView,
            WiFiSelectionView,
            WiFiTestView,
            EmbeddedWelcomeView,
            EmbeddedTestView,
            SetupWelcomeView,
            SetupProgressView,
            SetupCompletedView,
            SetupFailedView,
        }

        private MachineSetupResult _setup_result;

        #region Properties

        /// <summary>
        /// Gets or sets the machine setup manager.
        /// </summary>
        public IMachineSetupManager MachineSetupManager { get; set; }

        private String _serialNumber;
        /// <summary>
        /// Gets or sets the serial number.
        /// </summary>
        public String SerialNumber
        {
            get { return _serialNumber; }
            set { _serialNumber = value; RaisePropertyChangedAuto(); InvalidateRelayCommands(); }
        }

        private String _hostAddress;
        /// <summary>
        /// Gets or sets the host address.
        /// </summary>
        public String HostAddress
        {
            get { return _hostAddress; }
            set { _hostAddress = value; RaisePropertyChangedAuto(); InvalidateRelayCommands(); }
        }

        private String _log;
        /// <summary>
        /// Gets or sets the log.
        /// </summary>
        public String Log
        {
            get { return _log; }
            set { _log = value; RaisePropertyChangedAuto(); }
        }

        private MachineSetupStates _state;
        /// <summary>
        /// Gets or sets the state.
        /// </summary>
        public MachineSetupStates State
        {
            get { return _state; }
            set { _state = value; RaisePropertyChangedAuto(); InvalidateRelayCommands(); }
        }

        private String _machineConnectionStatus;
        public String MachineConnectionStatus
        {
            get { return _machineConnectionStatus; }
            set { _machineConnectionStatus = value; RaisePropertyChangedAuto(); }
        }

        #endregion

        #region Commands

        /// <summary>
        /// Gets or sets the complete command.
        /// </summary>
        public RelayCommand CompleteCommand { get; set; }

        /// <summary>
        /// Gets or sets the navigate to WiFi command.
        /// </summary>
        public RelayCommand NavigateToWiFiCommand { get; set; }

        /// <summary>
        /// Gets or sets the skip embedded test command.
        /// </summary>
        public RelayCommand SkipEmbeddedTestCommand { get; set; }

        /// <summary>
        /// Gets or sets the perform embedded test command.
        /// </summary>
        public RelayCommand PerformEmbeddedTestCommand { get; set; }

        /// <summary>
        /// Gets or sets the install command.
        /// </summary>
        public RelayCommand InstallCommand { get; set; }

        /// <summary>
        /// Gets or sets the restart command.
        /// </summary>
        public RelayCommand RestartCommand { get; set; }

        #endregion

        #region Constructors

        /// <summary>
        /// Initializes a new instance of the <see cref="MachineSetupViewVM"/> class.
        /// </summary>
        /// <param name="applicationManager">The application manager.</param>
        /// <param name="machineSetupManager">The machine setup manager.</param>
        public MachineSetupViewVM(IPPCApplicationManager applicationManager, IMachineSetupManager machineSetupManager)
        {
            MachineSetupManager = machineSetupManager;
            //MachineSetupManager.ProgressLog += (x, msg) => AppendLog(msg);
            MachineSetupManager.ProgressStep += (x, step) => AppendLog(Environment.NewLine + "-----------" + step.ToDescription().ToUpper() + "-----------" + Environment.NewLine);

            HostAddress = "localhost\\SQLEXPRESS";
            SerialNumber = "1111";

            CompleteCommand = new RelayCommand(CompleteSetup, () => State == MachineSetupStates.Completed);

            applicationManager.SetupRequired += ApplicationManager_SetupRequired;

            NavigateToWiFiCommand = new RelayCommand(EnsureWiFi);

            PerformEmbeddedTestCommand = new RelayCommand(PerformEmbeddedTest);
            SkipEmbeddedTestCommand = new RelayCommand(SkipEmbeddedTest);
            InstallCommand = new RelayCommand(Install);
            RestartCommand = new RelayCommand(() => { NavigateTo(MachineSetupView.WelcomeView); });

            if (!LogManager.Categories.Contains(LogCategory.Debug))
            {
                LogManager.Categories.Add(LogCategory.Debug);
            }

            var logger = new SimpleStringLogger();
            LogManager.RegisterLogger(logger);
            logger.LogReceived += Logger_LogReceived;
        }

        #endregion

        #region Event Handlers

        /// <summary>
        /// Handles the SetupRequired event of the ApplicationManager.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="EventArgs"/> instance containing the event data.</param>
        private void ApplicationManager_SetupRequired(object sender, EventArgs e)
        {
            LogManager.Log("SetupRequired event received. Navigating to MachineSetupView...");
            NavigationManager.NavigateTo(NavigationView.MachineSetupView);
        }


        private void Logger_LogReceived(object sender, LogItemBase e)
        {
            AppendLog(e.Message);
        }

        #endregion

        #region Private Methods

        /// <summary>
        /// Appends the log.
        /// </summary>
        /// <param name="msg">The MSG.</param>
        private void AppendLog(String msg)
        {
            if (msg != null && !msg.Contains("SQL Examiner"))
            {
                InvokeUI(() =>
                {
                    View.AppendLog(msg + Environment.NewLine);
                });
            }
        }

        /// <summary>
        /// Completes the setup.
        /// </summary>
        private void CompleteSetup()
        {
            String updater_exe = AssemblyHelper.GetCurrentAssemblyFolder() + "\\Tango.PPC.Updater.exe";

            LogManager.Log("Completing machine setup...");
            LogManager.Log($"Executing '{updater_exe}' with arguments '{_setup_result.UpdatePackagePath}'...");
            Process.Start(updater_exe, _setup_result.UpdatePackagePath);
            LogManager.Log("Terminating application process!");
            Environment.Exit(0);
        }

        /// <summary>
        /// Navigates to the specified view.
        /// </summary>
        /// <param name="view">The view.</param>
        private Task NavigateTo(MachineSetupView view)
        {
            return View.NavigateTo(view);
        }

        #endregion

        #region WiFi

        private async void EnsureWiFi()
        {
            await NavigateTo(MachineSetupView.WiFiTestView);

            await Task.Delay(2000);

            bool connected = await ConnectivityProvider.CheckInternetConnection();

            if (connected)
            {
                await NavigateTo(MachineSetupView.EmbeddedWelcomeView);
            }
            else
            {
                await NavigateTo(MachineSetupView.WiFiSelectionView);
                await ConnectivityProvider.RefreshAvailableWiFiNetworks();

                ConnectivityProvider.ConnectionStateChanged += ConnectivityProvider_ConnectionStateChanged;
            }
        }

        private void ConnectivityProvider_ConnectionStateChanged(object sender, Common.Connectivity.ConnectionStateEventArgs e)
        {
            if (e.IsConnected)
            {
                ConnectivityProvider.ConnectionStateChanged -= ConnectivityProvider_ConnectionStateChanged;
                EnsureWiFi();
            }
        }

        #endregion

        #region Embedded

        private async void PerformEmbeddedTest()
        {
            await NavigateTo(MachineSetupView.EmbeddedTestView);

            try
            {
                MachineConnectionStatus = "Scanning for the machine...";

                LogManager.Log("Starting machine connection procedure...");

                TimeSpan timeout = TimeSpan.FromSeconds(SettingsManager.Default.GetOrCreate<PPCSettings>().MachineScanningTimeoutSeconds);

                LogManager.Log("Scanning for machine on available serial ports...");
                Transport.Discovery.UsbCommunicationScanner<ConnectRequest, ConnectResponse> scanner = new Transport.Discovery.UsbCommunicationScanner<ConnectRequest, ConnectResponse>(UsbSerialBaudRates.BR_9600);

                scanner.ScanningPort += (port) =>
                {
                    MachineConnectionStatus = $"Scanning for the machine on {port}...";
                };

                var response = await scanner.Scan(new ConnectRequest() { Password = "1234" }, timeout);

                MachineConnectionStatus = "Machine discovered on port: " + response.Adapter.Address + ", trying to connect...";

                LogManager.Log("Machine discovered on port: " + response.Adapter.Address);
                LogManager.Log("Device Information:");
                LogManager.Log(response.Response.DeviceInformation.ToJsonString());

                LogManager.Log("Disconnecting machine operator...");

                IMachineOperator op = new MachineOperator(response.Adapter);

                op.EnableDiagnostics = false;
                op.EnableEmbeddedDebugging = false;
                op.EnableEventsNotification = false;

                LogManager.Log("Connecting machine operator...");
                await op.Connect();

                MachineConnectionStatus = "Test completed successfully!";

                await Task.Delay(1000);

                try
                {
                    await op.Disconnect();
                }
                catch { }

                await NavigateTo(MachineSetupView.SetupWelcomeView);
            }
            catch (Exception ex)
            {
                LogManager.Log(ex, "Error while trying to scan and connect to the machine.");
                MachineConnectionStatus = "Test Failed!";
                await Task.Delay(2000);
                await NavigateTo(MachineSetupView.EmbeddedWelcomeView);
            }
        }

        private async void SkipEmbeddedTest()
        {
            if (await NotificationProvider.ShowQuestion("Are you sure you want to skip the machine communication test?"))
            {

            }
        }

        #endregion

        #region Setup

        private async void Install()
        {
            await NavigateTo(MachineSetupView.SetupProgressView);

            LogManager.Log("Starting machine setup...");

            State = MachineSetupStates.Working;

            try
            {
                _setup_result = await MachineSetupManager.Setup(SerialNumber, HostAddress);
                Settings.ApplicationState = ApplicationStates.SemiSetup;
                Settings.Save();
                State = MachineSetupStates.Completed;
                LogManager.Log("Machine setup completed.");
                await NavigateTo(MachineSetupView.SetupCompletedView);
            }
            catch (Exception ex)
            {
                LogManager.Log(ex, "Machine setup failed.");
                State = MachineSetupStates.Failed;
                await NavigateTo(MachineSetupView.SetupFailedView);
            }
        }

        #endregion
    }
}