using Microsoft.Win32;
using System;
using System.IO;
using System.Windows;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using WinForms = System.Windows.Forms;

namespace dealer
{
    public partial class EditVehicleWindow : Window
    {
        public string? SelectedPhotoPath { get; private set; }
        public System.Windows.Media.Color SelectedColor { get; private set; } = Colors.White;
        public bool WasEdited { get; private set; } = false;

        private DataManager dataManager;
        private Vehicle vehicle;
        private bool photoChanged = false;

        public EditVehicleWindow(Vehicle vehicle, DataManager dataManager)
        {
            InitializeComponent();

            this.dataManager = dataManager;
            this.vehicle = vehicle;

            LoadVehicleData();
        }

        private void LoadVehicleData()
        {
            // SPZ
            SpzTextBox.Text = vehicle.Spz ?? "";

            // Model
            ModelTextBox.Text = vehicle.Model ?? "";

            // Barva
            if (!string.IsNullOrEmpty(vehicle.Barva))
            {
                try
                {
                    SelectedColor = (System.Windows.Media.Color)System.Windows.Media.ColorConverter.ConvertFromString(vehicle.Barva);
                    ColorPreviewBorder.Background = new SolidColorBrush(SelectedColor);
                    ColorNameTextBlock.Text = vehicle.Barva;
                    ColorNameTextBlock.FontStyle = FontStyles.Normal;
                    ColorNameTextBlock.Foreground = System.Windows.Media.Brushes.Black;
                }
                catch
                {
                    ColorPreviewBorder.Background = System.Windows.Media.Brushes.White;
                }
            }

            // Rok vyroby
            YearTextBox.Text = vehicle.RokVyroby?.ToString() ?? "";

            // Najete km
            MileageTextBox.Text = vehicle.NajeteKm?.ToString() ?? "";

            // Cena
            PriceTextBox.Text = vehicle.Cena?.ToString() ?? "";

            // Fotografie (base64)
            if (!string.IsNullOrEmpty(vehicle.Fotografie))
            {
                try
                {
                    byte[] imageBytes = Convert.FromBase64String(vehicle.Fotografie);
                    using (var ms = new MemoryStream(imageBytes))
                    {
                        var bitmap = new BitmapImage();
                        bitmap.BeginInit();
                        bitmap.CacheOption = BitmapCacheOption.OnLoad;
                        bitmap.StreamSource = ms;
                        bitmap.EndInit();
                        bitmap.Freeze();
                        CurrentPhotoImage.Source = bitmap;
                    }
                    CurrentPhotoBorder.Visibility = Visibility.Visible;
                    PhotoPathTextBlock.Text = "Aktualni fotografie zobrazena vyse";
                }
                catch
                {
                    CurrentPhotoBorder.Visibility = Visibility.Collapsed;
                }
            }
        }

        private void SelectPhotoButton_Click(object sender, RoutedEventArgs e)
        {
            Microsoft.Win32.OpenFileDialog openFileDialog = new Microsoft.Win32.OpenFileDialog
            {
                Title = "Vyberte fotografii vozidla",
                Filter = "Obrazky|*.jpg;*.jpeg;*.png;*.bmp;*.gif|Vsechny soubory|*.*",
                FilterIndex = 1
            };

            if (openFileDialog.ShowDialog() == true)
            {
                SelectedPhotoPath = openFileDialog.FileName;
                PhotoPathTextBlock.Text = SelectedPhotoPath;
                photoChanged = true;

                // Show preview of new photo
                try
                {
                    var bitmap = new BitmapImage(new Uri(SelectedPhotoPath));
                    CurrentPhotoImage.Source = bitmap;
                    CurrentPhotoBorder.Visibility = Visibility.Visible;
                }
                catch
                {
                    // Ignore preview errors
                }
            }
        }

        private void SelectColorButton_Click(object sender, RoutedEventArgs e)
        {
            WinForms.ColorDialog colorDialog = new WinForms.ColorDialog
            {
                AllowFullOpen = true,
                FullOpen = true
            };

            if (colorDialog.ShowDialog() == WinForms.DialogResult.OK)
            {
                SelectedColor = System.Windows.Media.Color.FromArgb(
                    colorDialog.Color.A,
                    colorDialog.Color.R,
                    colorDialog.Color.G,
                    colorDialog.Color.B);

                ColorPreviewBorder.Background = new SolidColorBrush(SelectedColor);
                ColorNameTextBlock.Text = $"#{SelectedColor.R:X2}{SelectedColor.G:X2}{SelectedColor.B:X2}";
                ColorNameTextBlock.FontStyle = FontStyles.Normal;
                ColorNameTextBlock.Foreground = System.Windows.Media.Brushes.Black;
            }
        }

        private void NumericOnly_PreviewTextInput(object sender, TextCompositionEventArgs e)
        {
            e.Handled = !int.TryParse(e.Text, out _);
        }

        private void DecimalOnly_PreviewTextInput(object sender, TextCompositionEventArgs e)
        {
            var textBox = sender as System.Windows.Controls.TextBox;
            string newText = textBox?.Text.Insert(textBox.SelectionStart, e.Text) ?? e.Text;
            e.Handled = !decimal.TryParse(newText, out _);
        }

        private void SaveButton_Click(object sender, RoutedEventArgs e)
        {
            // Update vehicle properties
            vehicle.Spz = SpzTextBox.Text;
            vehicle.Model = ModelTextBox.Text;
            vehicle.Barva = $"#{SelectedColor.R:X2}{SelectedColor.G:X2}{SelectedColor.B:X2}";
            vehicle.RokVyroby = int.TryParse(YearTextBox.Text, out int rok) ? rok : (int?)null;
            vehicle.NajeteKm = int.TryParse(MileageTextBox.Text, out int km) ? km : (int?)null;
            vehicle.Cena = decimal.TryParse(PriceTextBox.Text, out decimal cena) ? cena : (decimal?)null;

            // Update photo only if changed
            if (photoChanged && !string.IsNullOrEmpty(SelectedPhotoPath) && File.Exists(SelectedPhotoPath))
            {
                byte[] imageBytes = File.ReadAllBytes(SelectedPhotoPath);
                vehicle.Fotografie = Convert.ToBase64String(imageBytes);
            }

            this.dataManager.Save();
            WasEdited = true;

            this.Close();
        }

        private void CancelButton_Click(object sender, RoutedEventArgs e)
        {
            this.Close();
        }
    }
}