using System;
using Avalonia;
using Avalonia.Controls;
using Avalonia.Interactivity;
using Project_Periodensystem.Model;
using Project_Periodensystem.Persistence;

namespace Project_Periodensystem.View
{
    /// <summary>
    /// Code-Behind für die Landing Page
    /// </summary>
    public partial class LandingPage : UserControl
    {
        /// <summary>
        /// Konstruktor
        /// </summary>
        public LandingPage()
        {
            InitializeComponent();
        }

        /// <summary>
        /// Event-Handler für Periodensystem-Button
        /// </summary>
        private void PeriodicTableButton_Click(object? sender, RoutedEventArgs e)
        {
            try
            {
                var mainWindow = TopLevel.GetTopLevel(this) as Window;
                if (mainWindow != null)
                {
                    var periodicTablePage = new PeriodicTablePage();
                    mainWindow.Content = periodicTablePage;
                    Logger.Log("Navigation zum Periodensystem");
                }
            }
            catch (Exception ex)
            {
                Logger.Log($"Fehler bei Navigation zum Periodensystem: {ex.Message}");
            }
        }

        /// <summary>
        /// Event-Handler für About-Button
        /// </summary>
        private void AboutButton_Click(object? sender, RoutedEventArgs e)
        {
            try
            {
                var mainWindow = TopLevel.GetTopLevel(this) as Window;
                if (mainWindow != null)
                {
                    var aboutPage = new AboutPage();
                    mainWindow.Content = aboutPage;
                    Logger.Log("Navigation zur About-Seite");
                }
            }
            catch (Exception ex)
            {
                Logger.Log($"Fehler bei Navigation zu About: {ex.Message}");
            }
        }

        /// <summary>
        /// Event-Handler für Theme-Button (MIT SETTINGS-SPEICHERUNG)
        /// </summary>
        private void ThemeButton_Click(object? sender, RoutedEventArgs e)
        {
            try
            {
                Logger.Log("Theme-Button geklickt");
                
                var app = Application.Current;
                if (app != null)
                {
                    var currentTheme = app.ActualThemeVariant;
                    Logger.Log($"Aktuelles Theme: {currentTheme}");
                    
                    var newTheme = currentTheme == Avalonia.Styling.ThemeVariant.Dark 
                        ? Avalonia.Styling.ThemeVariant.Light 
                        : Avalonia.Styling.ThemeVariant.Dark;
                    
                    app.RequestedThemeVariant = newTheme;
                    Logger.Log($"Theme gewechselt zu: {newTheme}");
                    
                    // NEUE FUNKTION: Theme-Einstellung speichern
                    var settings = DataManager.LoadSettings();
                    settings.LastTheme = newTheme.ToString();
                    settings.LastUsed = DateTime.Now;
                    DataManager.SaveSettings(settings);
                    Logger.Log("Theme-Einstellung gespeichert");
                }
                else
                {
                    Logger.Log("Application.Current ist null!");
                }
            }
            catch (Exception ex)
            {
                Logger.Log($"EXCEPTION in ThemeButton_Click: {ex.Message}");
            }
        }
    }
}