using System;
using System.Collections.Generic;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using Microsoft.Win32;
using System.IO;
using System.Windows.Threading;
using System.Windows.Forms;
using Hardcodet.Wpf.TaskbarNotification;
using LD_SysInfo.Services;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System.Windows.Media.Animation;
using LD_SysInfo.Models;
using MaterialDesignColors;
using MaterialDesignThemes.Wpf;
using System.Windows.Input;
using Application = System.Windows.Application;
using System.Windows.Media;



namespace LD_SysInfo

{
    public partial class MainWindow : Window
    {

        private static readonly HttpClient httpClient = new HttpClient();
        private static AppConfig _config;
        private static string jwtToken = null; // 🔹 Store the JWT token globally in the app
        private readonly DispatcherTimer messageClearTimer;
        private readonly DispatcherTimer postTimer;
        private readonly DispatcherTimer keepAliveTimer;
        private readonly Uri LightThemeUri = new Uri("pack://application:,,,/Themes/LightTheme.xaml", UriKind.Absolute);
        private readonly Uri DarkThemeUri = new Uri("pack://application:,,,/Themes/DarkTheme.xaml", UriKind.Absolute);
        private bool isDarkTheme = false;

        private static readonly string ConfigPath = Path.Combine(AppContext.BaseDirectory, "config.json");


        public MainWindow()
        {
            // ⚠️ Temporary SSL Certificate Bypass - For Testing Only
            System.Net.ServicePointManager.ServerCertificateValidationCallback += (sender, cert, chain, sslPolicyErrors) => true;

            InitializeComponent();
            LoadConfig();
            DisplaySystemInfo();
            AutoLogin();

            // 🔍 Perform initial connectivity check
            Task.Run(async () => await InitialCheckConnectivity());

            // Initialize the system tray icon event
            TrayIcon.TrayMouseDoubleClick += TrayIcon_DoubleClick;

            // 🔥 Initialize the DispatcherTimer for fading out messages (statically set to 5 seconds)
            messageClearTimer = new DispatcherTimer();
            messageClearTimer.Interval = TimeSpan.FromSeconds(5);  // Set to 5 seconds (static)
            messageClearTimer.Tick += MessageClearTimer_Tick;

            // 🔥 Initialize the DispatcherTimer for periodic POSTs using _config.PollingInterval
            postTimer = new DispatcherTimer();
            postTimer.Interval = TimeSpan.FromSeconds(_config.SystemInfoInterval);
            postTimer.Tick += PostTimer_Tick;
            postTimer.Start();

            // 🔁 Initialize the KeepAlive timer using KeepAlivePeriod from config
            keepAliveTimer = new DispatcherTimer();
            keepAliveTimer.Interval = TimeSpan.FromSeconds(_config.KeepAlivePeriod);  // Set from config
            keepAliveTimer.Tick += KeepAliveTimer_Tick;
            keepAliveTimer.Start();




        }


        private void LoadConfig()
        {
            try
            {
                //System.Windows.MessageBox.Show($"DEBUG: AppContext.BaseDirectory = {AppContext.BaseDirectory}");
                //System.Windows.MessageBox.Show($"DEBUG: ConfigPath = {ConfigPath}");

                if (!File.Exists((string?)ConfigPath))
                {
                    System.Windows.MessageBox.Show("❌ config.json not found at resolved path!");
                }

                _config = ConfigManager.LoadConfig(ConfigPath);


                if (_config == null || string.IsNullOrWhiteSpace(_config.ClientIdentifier))
                {
                    throw new Exception("❌ Invalid or missing ClientIdentifier in config.json.");
                }
            }
            catch (Exception ex)
            {
                System.Windows.MessageBox.Show($"❌ Error loading config: {ex.Message}", "Error", MessageBoxButton.OK, MessageBoxImage.Error);
                _config = new AppConfig(); // Prevent application from crashing
            }
        }


        private async Task InitialCheckConnectivity()
        {
            var apiClient = new ApiClient(_config);
            bool isConnected = await apiClient.CheckConnectivity();

            // You must update the UI from the UI thread
            Dispatcher.Invoke(() =>
            {
                if (isConnected)
                {
                    ConnectionStatusTextBlock.Text = "Connected to Server";
                    ConnectionStatusTextBlock.Foreground = new System.Windows.Media.SolidColorBrush(System.Windows.Media.Colors.Green);
                }
                else
                {
                    ConnectionStatusTextBlock.Text = "No Connection";
                    ConnectionStatusTextBlock.Foreground = new System.Windows.Media.SolidColorBrush(System.Windows.Media.Colors.Red);
                }
            });
        }

        private async void AutoLogin()
        {
            if (_config == null || _config.Auth == null ||
                string.IsNullOrEmpty(_config.Auth.Username) || string.IsNullOrEmpty(_config.Auth.Password))
            {
                UpdateStatusUI(false);
                return;
            }

            var apiClient = new ApiClient(_config);
            LoginResponse loginResponse = await apiClient.AuthenticateAsync(_config.Auth.Username, _config.Auth.Password);

            if (loginResponse != null && !string.IsNullOrEmpty(loginResponse.Token))
            {
                ApiClient.SetJwtToken(loginResponse.Token);
                UpdateStatusUI(true);
            }
            else
            {
                UpdateStatusUI(false);
            }
        }

        private async void AuthenticateButton_Click(object sender, RoutedEventArgs e)
        {
            var apiClient = new ApiClient(_config);
            LoginResponse loginResponse = await apiClient.AuthenticateAsync(txtUsername.Text, pwdPassword.Password);

            if (loginResponse != null && !string.IsNullOrEmpty(loginResponse.Token))
            {
                ApiClient.SetJwtToken(loginResponse.Token);
                UpdateStatusUI(true);  // 🔥 Successfully authenticated
            }
            else
            {
                UpdateStatusUI(false);
            }
        }


        private async void CheckConnectivityButton_Click(object sender, RoutedEventArgs e)
        {
            var apiClient = new ApiClient(_config);
            bool isConnected = await apiClient.CheckConnectivity();

            if (isConnected)
            {
                ConnectionStatusTextBlock.Text = "Connected to Server";
                ConnectionStatusTextBlock.Foreground = new System.Windows.Media.SolidColorBrush(System.Windows.Media.Colors.Green);
            }
            else
            {
                ConnectionStatusTextBlock.Text = "No Connection";
                ConnectionStatusTextBlock.Foreground = new System.Windows.Media.SolidColorBrush(System.Windows.Media.Colors.Red);
            }
        }

        private void GenerateLogsButton_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                string logDir = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "LD_SysInfo", "Logs");
                Directory.CreateDirectory(logDir); // Ensure directory exists

                string logFile = Path.Combine(logDir, $"log_{DateTime.Now:yyyyMMdd_HHmmss}.txt");
                File.WriteAllText(logFile, "=== LD SysInfo Diagnostic Log ===\n");

                File.AppendAllText(logFile, $"Timestamp: {DateTime.Now}\n");
                File.AppendAllText(logFile, $"Hostname: {Environment.MachineName}\n");
                File.AppendAllText(logFile, $"OS: {Environment.OSVersion}\n");
                File.AppendAllText(logFile, $"Server Status: {ConnectionStatusTextBlock.Text}\n");

                System.Windows.MessageBox.Show($"Logs generated successfully!\nPath: {logFile}", "Log Generated", MessageBoxButton.OK, MessageBoxImage.Information);
            }
            catch (Exception ex)
            {
                System.Windows.MessageBox.Show($"Failed to generate logs.\nError: {ex.Message}", "Error", MessageBoxButton.OK, MessageBoxImage.Error);
            }
        }

        private void DisplaySystemInfo()
        {
            var sysInfo = SystemInfo.GetSystemInfo();
            OSNameTextBlock.Text = $"OS Name: {sysInfo.OSName}";
            OSVersionTextBlock.Text = $"OS Version: {sysInfo.OSVersion}";
            WindowsVersionTextBlock.Text = $"Windows Version: {sysInfo.WindowsVersion}";
            WindowsBuildTextBlock.Text = $"Windows Build: {sysInfo.WindowsBuild}";
            OSArchitectureTextBlock.Text = $"OS Architecture: {sysInfo.OSArchitecture}";
            ProcessorNameTextBlock.Text = $"Processor Name: {sysInfo.ProcessorName}";
            ProcessorArchitectureTextBlock.Text = $"Processor Architecture: {sysInfo.ProcessorArchitecture}";
            HostnameTextBlock.Text = $"Hostname: {sysInfo.Hostname}";
        }

        private void LoadInstalledAppsButton_Click(object sender, RoutedEventArgs e)
        {
            var applications = SystemInfo.GetInstalledApplicationsFromRegistry();
            InstalledAppsListBox.ItemsSource = applications;
        }

        private async void StoreSystemInfoButton_Click(object sender, RoutedEventArgs e)
        {
            if (string.IsNullOrEmpty(ApiClient.GetJwtToken()))  // Check token via ApiClient
            {
                System.Windows.MessageBox.Show("❌ Please log in first.", "Not Authenticated", MessageBoxButton.OK, MessageBoxImage.Warning);
                return;
            }

            try
            {
                var sysInfo = SystemInfo.GetSystemInfo();
                var applications = SystemInfo.GetInstalledApplicationsFromRegistry();

                var formattedApplications = new List<object>();
                foreach (var app in applications)
                {
                    formattedApplications.Add(new
                    {
                        app_name = app.Name,
                        app_version = app.Version,
                        publisher = app.Publisher
                    });
                }

                var payload = new
                {
                    clientIdentifier = _config.ClientIdentifier,
                    hostname = sysInfo.Hostname,
                    osName = sysInfo.OSName,
                    osVersion = sysInfo.OSVersion,
                    windowsVersion = sysInfo.WindowsVersion,
                    windowsBuild = sysInfo.WindowsBuild,
                    osArchitecture = sysInfo.OSArchitecture,
                    processorName = sysInfo.ProcessorName,
                    processorArchitecture = sysInfo.ProcessorArchitecture,
                    gpuName = sysInfo.GpuNames,
                    totalMemory = sysInfo.TotalMemory,
                    ipAddresses = sysInfo.IpAddresses,
                    lastBootTime = sysInfo.LastBootTime,
                    drives = sysInfo.Drives,
                    installedApplications = formattedApplications
                };


                var apiClient = new ApiClient(_config);
                string jsonPayload = JsonConvert.SerializeObject(payload);
                Console.WriteLine("🔍 [DEBUG] Raw JSON Payload:\n" + jsonPayload);

                string encryptedPayload = EncryptionHelper.EncryptData(jsonPayload);

                string response = await apiClient.StoreSystemInfoAsync(encryptedPayload);

                if (response.StartsWith("Error"))
                {
                    StatusTextBlock.Text = $"❌ {response}";
                    StatusTextBlock.Foreground = new System.Windows.Media.SolidColorBrush(System.Windows.Media.Colors.Red);
                }
                else
                {
                    StatusTextBlock.Text = "✅ System info stored successfully!";
                    StatusTextBlock.Foreground = new System.Windows.Media.SolidColorBrush(System.Windows.Media.Colors.Green);

                    // 🔥 Trigger Fade Out Animation
                    messageClearTimer.Stop(); // Stop existing timer
                    FadeOutStatusMessage();   // Start the fade-out animation
                }
            }
            catch (Exception ex)
            {
                StatusTextBlock.Text = $"❌ Error: {ex.Message}";
                StatusTextBlock.Foreground = new System.Windows.Media.SolidColorBrush(System.Windows.Media.Colors.Red);
            }
        }

        private void LoadThemeResources(string resourcePath)
        {
            var dictionaries = Application.Current.Resources.MergedDictionaries;
            dictionaries.Clear();

            // Add required MaterialDesign v5 resource dictionaries
            dictionaries.Add(new ResourceDictionary
            {
                Source = new Uri("pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesign3.Defaults.xaml", UriKind.Absolute)
            });

            dictionaries.Add(new ResourceDictionary
            {
                Source = new Uri(isDarkTheme
                    ? "pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesign3.Dark.xaml"
                    : "pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesign3.Light.xaml", UriKind.Absolute)
            });

            // Optional: Your custom theme overrides (LightTheme.xaml or DarkTheme.xaml)
            dictionaries.Add(new ResourceDictionary
            {
                Source = new Uri(resourcePath, UriKind.RelativeOrAbsolute)
            });
        }






        private void ThemeToggleButton_Click(object sender, RoutedEventArgs e)
        {
            isDarkTheme = !isDarkTheme;

            LoadThemeResources(isDarkTheme ? "Themes/DarkTheme.xaml" : "Themes/LightTheme.xaml");
        }


        private void TitleBar_MouseDown(object sender, MouseButtonEventArgs e)
        {
            if (e.ChangedButton == MouseButton.Left)
            {
                this.DragMove();
            }
        }

        private void MinimizeWindow_Click(object sender, RoutedEventArgs e)
        {
            WindowState = WindowState.Minimized;
        }

        private void MaximizeRestoreWindow_Click(object sender, RoutedEventArgs e)
        {
            if (WindowState == WindowState.Maximized)
                WindowState = WindowState.Normal;
            else
                WindowState = WindowState.Maximized;
        }

        private void CloseWindow_Click(object sender, RoutedEventArgs e)
        {
            Close();
        }

        private void ExportToCsvButton_Click(object sender, RoutedEventArgs e)
        {
            var saveFileDialog = new Microsoft.Win32.SaveFileDialog
            {
                Filter = "CSV files (*.csv)|*.csv",
                Title = "Save System Info as CSV",
                FileName = "SystemInfo.csv"
            };

            if (saveFileDialog.ShowDialog() == true)
            {
                var sysInfo = SystemInfo.GetSystemInfo();

                try
                {
                    using (var writer = new StreamWriter(saveFileDialog.FileName))
                    {
                        writer.WriteLine("Property,Value");
                        writer.WriteLine($"Hostname,{sysInfo.Hostname}");
                        writer.WriteLine($"OS Name,{sysInfo.OSName}");
                        writer.WriteLine($"OS Version,{sysInfo.OSVersion}");
                        writer.WriteLine($"Windows Version,{sysInfo.WindowsVersion}");
                        writer.WriteLine($"Windows Build,{sysInfo.WindowsBuild}");
                        writer.WriteLine($"OS Architecture,{sysInfo.OSArchitecture}");
                        writer.WriteLine($"Processor Name,{sysInfo.ProcessorName}");
                        writer.WriteLine($"Processor Architecture,{sysInfo.ProcessorArchitecture}");

                        if (IncludeInstalledAppsCheckBox.IsChecked == true)
                        {
                            writer.WriteLine();
                            writer.WriteLine("Installed Applications:");
                            writer.WriteLine("Name,Version,Publisher");

                            var applications = SystemInfo.GetInstalledApplicationsFromRegistry();
                            foreach (var app in applications)
                            {
                                writer.WriteLine($"{app.Name},{app.Version},{app.Publisher}");
                            }
                        }
                    }

                    StatusTextBlock.Text = "System info exported successfully!";
                    messageClearTimer.Start(); // Start the timer to clear the message after 5 seconds
                }
                catch (Exception ex)
                {
                    StatusTextBlock.Text = $"Error saving file: {ex.Message}";
                }
            }
        }

        private async void UpdateStatusUI(bool isAuthenticated)
        {
            // Ensure we're on the UI thread before updating UI elements
            Dispatcher.Invoke(() =>
            {
                if (isAuthenticated)
                {
                    txtUsername.Visibility = Visibility.Collapsed;
                    pwdPassword.Visibility = Visibility.Collapsed;
                    AuthenticateButton.Visibility = Visibility.Collapsed;

                    StatusTextBlock.Text = "✅ Authenticated - Connected to Server";
                    StatusTextBlock.Foreground = (SolidColorBrush)FindResource("StatusConnectedBrush");  // Use your custom brush

                    // 🔍 Check connectivity to the server
                    var apiClient = new ApiClient(_config);
                    Task.Run(async () =>
                    {
                        bool isConnected = await apiClient.CheckConnectivity();

                        // Update connection status on the UI thread
                        Dispatcher.Invoke(() =>
                        {
                            if (isConnected)
                            {
                                ConnectionStatusTextBlock.Text = "Connected to Server";
                                ConnectionStatusTextBlock.Foreground = (SolidColorBrush)FindResource("StatusConnectedBrush");  // Use your custom brush
                            }
                            else
                            {
                                ConnectionStatusTextBlock.Text = "No Connection";
                                ConnectionStatusTextBlock.Foreground = (SolidColorBrush)FindResource("ErrorBrush");  // Use your custom error color
                            }
                        });
                    });

                    // 🔥 Start the timer to clear the message after a delay
                    messageClearTimer.Stop(); // Stop any running timer first
                    messageClearTimer.Start();
                }
                else
                {
                    txtUsername.Visibility = Visibility.Visible;
                    pwdPassword.Visibility = Visibility.Visible;
                    AuthenticateButton.Visibility = Visibility.Visible;

                    StatusTextBlock.Text = "❌ Not Authenticated - Please Log In";
                    StatusTextBlock.Foreground = (SolidColorBrush)FindResource("ErrorBrush");  // Use your custom error color

                    ConnectionStatusTextBlock.Text = "No Connection";
                    ConnectionStatusTextBlock.Foreground = (SolidColorBrush)FindResource("ErrorBrush");  // Use your custom error color

                    // Stop the timer if the user is not authenticated
                    messageClearTimer.Stop();
                }
            });
        }

        private void FadeOutStatusMessage()
        {
            var fadeOutAnimation = new DoubleAnimation
            {
                From = 1.0,
                To = 0.0,
                Duration = TimeSpan.FromSeconds(3),
                AutoReverse = false
            };

            fadeOutAnimation.Completed += (s, e) =>
            {
                StatusTextBlock.Text = string.Empty;  // Clear the text after fading
                StatusTextBlock.Opacity = 1.0;        // Reset the opacity for future use
            };

            StatusTextBlock.BeginAnimation(OpacityProperty, fadeOutAnimation);
            messageClearTimer.Stop();
        }

        private async void PostTimer_Tick(object sender, EventArgs e)
        {
            if (string.IsNullOrEmpty(ApiClient.GetJwtToken()))  // Ensure authentication is active
            {
                StatusTextBlock.Text = "❌ Not authenticated. Please log in first.";
                return;
            }

            var apiClient = new ApiClient(_config);  // Create an instance of ApiClient

            var sysInfo = SystemInfo.GetSystemInfo();
            var applications = SystemInfo.GetInstalledApplicationsFromRegistry();

            var formattedApplications = new List<object>();
            foreach (var app in applications)
            {
                formattedApplications.Add(new
                {
                    app_name = app.Name,
                    app_version = app.Version,
                    publisher = app.Publisher
                });
            }

            var payload = new
            {
                clientIdentifier = _config.ClientIdentifier,
                hostname = sysInfo.Hostname,
                osName = sysInfo.OSName,
                osVersion = sysInfo.OSVersion,
                windowsVersion = sysInfo.WindowsVersion,
                windowsBuild = sysInfo.WindowsBuild,
                osArchitecture = sysInfo.OSArchitecture,
                processorName = sysInfo.ProcessorName,
                processorArchitecture = sysInfo.ProcessorArchitecture,
                gpuName = sysInfo.GpuNames,
                totalMemory = sysInfo.TotalMemory,
                ipAddresses = sysInfo.IpAddresses,
                lastBootTime = sysInfo.LastBootTime,
                drives = sysInfo.Drives,
                installedApplications = formattedApplications
            };




            string jsonPayload = JsonConvert.SerializeObject(payload);
            Console.WriteLine("🔍 [DEBUG] Raw JSON Payload:\n" + jsonPayload);

            string encryptedPayload = EncryptionHelper.EncryptData(jsonPayload);

            string response = await apiClient.StoreSystemInfoAsync(encryptedPayload);

            if (response.StartsWith("Error"))
            {
                StatusTextBlock.Text = $"❌ {response}";
                StatusTextBlock.Foreground = new System.Windows.Media.SolidColorBrush(System.Windows.Media.Colors.Red);
            }
            else
            {
                StatusTextBlock.Text = "✅ System info stored successfully!";
                StatusTextBlock.Foreground = new System.Windows.Media.SolidColorBrush(System.Windows.Media.Colors.Green);
                messageClearTimer.Stop();
                FadeOutStatusMessage();
            }
        }

        private async void KeepAliveTimer_Tick(object sender, EventArgs e)
        {
            var apiClient = new ApiClient(_config);
            bool isConnected = await apiClient.CheckConnectivity();

            Dispatcher.Invoke(() =>
            {
                if (isConnected)
                {
                    ConnectionStatusTextBlock.Text = "Connected to Server (Ping)";
                    // Use the custom gold color for connection status
                    ConnectionStatusTextBlock.Foreground = (SolidColorBrush)FindResource("StatusConnectedBrush");
                }
                else
                {
                    ConnectionStatusTextBlock.Text = "No Connection";
                    // Use the custom error color for no connection
                    ConnectionStatusTextBlock.Foreground = (SolidColorBrush)FindResource("ErrorBrush");
                }
            });
        }


        private void MessageClearTimer_Tick(object sender, EventArgs e)
        {
            FadeOutStatusMessage();  // Trigger the fade-out effect
        }

        private void TrayIcon_DoubleClick(object sender, RoutedEventArgs e)
        {
            ShowWindow();
        }

        private void ShowWindow_Click(object sender, RoutedEventArgs e)
        {
            ShowWindow();
        }

        private void ShowWindow()
        {
            this.Show();
            this.WindowState = WindowState.Normal;
        }

        private void Exit_Click(object sender, RoutedEventArgs e)
        {
            TrayIcon.Dispose();
            System.Windows.Application.Current.Shutdown();
        }

        // Minimize to system tray instead of closing
        protected override void OnStateChanged(EventArgs e)
        {
            if (WindowState == WindowState.Minimized)
            {
                this.Hide();  // Hide the window when minimized
            }
            base.OnStateChanged(e);
        }

    }
}