using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
//using System.Windows.Shapes;
using System.IO;
using System.Drawing;
using System.Drawing.Imaging;
using System.ComponentModel;

namespace ImageWPFApp
{
    /// <summary>
    /// Логика взаимодействия для MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        public class WBitmap: INotifyPropertyChanged
        {
            private WriteableBitmap wb;

            public WriteableBitmap Bitmap
            {
                get
                {
                    return this.wb;
                }
                set
                {
                    if (value != this.wb)
                    {
                        this.wb = value;
                        NotifyPropertyChanged("Bitmap");
                    }
                }
            }

            protected void NotifyPropertyChanged(String propertyName)
            {
                if (PropertyChanged != null)
                    PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
            }

            public event PropertyChangedEventHandler PropertyChanged;
        }

        private string path = System.IO.Path.Combine(Environment.CurrentDirectory, "picture.jpg");
        public WBitmap wb { get; set; }
        private double lastBrightness = 0;

        private byte ToByte(int Value)
        {
            if (Value < 0) Value = 0;
            if (Value > 255) Value = 255;
            return (byte)Value;
        }

        private void Window_Loaded(object sender, RoutedEventArgs e) // тут биндинг
        {
            wb = new WBitmap { Bitmap = new WriteableBitmap(new BitmapImage(new Uri(path))) };
            Binding binding = new Binding("Bitmap");
            binding.Source = wb;
            //binding.Mode = BindingMode.OneWay;
            image.SetBinding(System.Windows.Controls.Image.SourceProperty, binding);

        }

        private void slider_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
        {
            var transform = new RotateTransform(360.0 - rotateSlider.Value);
            image.RenderTransform = transform;
        }


        private void brightnessSlider_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e) // <---
        {
            if (wb == null) return; // в этой функции wb будет меняться
            wb.Bitmap.Lock();
            // в Слайдере у меня Min 0, Max 200, перевожу в шкалу от -100 до 100
            double brightness = brightnessSlider.Value - 100;
            int delta = (int)(brightness - lastBrightness);
            int width = (int)wb.Bitmap.Width;
            int height = (int)wb.Bitmap.Height;
            int stride = wb.Bitmap.BackBufferStride;
            int bytesPerPixel = (wb.Bitmap.Format.BitsPerPixel + 7) / 8;
            unsafe
            {
                IntPtr pBackBuffer = wb.Bitmap.BackBuffer;
                byte* pBuff = (byte*)pBackBuffer.ToPointer();

                for (int row = 0; row < height; row++)
                    for (int col = 0; col < width; col++)
                        for (int k = 0; k < bytesPerPixel-1; k++)
                        {
                            int index = row * width * bytesPerPixel + col * bytesPerPixel + k;
                            pBuff[index] = ToByte(pBuff[index] + delta);
                        }
            }
            lastBrightness = brightness;
            Title = lastBrightness.ToString();
            wb.Bitmap.Unlock();
        }

        private void CreateThumbnail(string filename, BitmapSource image5)
        {
            if (filename != string.Empty)
            {
                using (FileStream stream5 = new FileStream(filename, FileMode.Create))
                {
                    JpegBitmapEncoder encoder5 = new JpegBitmapEncoder();
                    encoder5.Frames.Add(BitmapFrame.Create(image5));
                    encoder5.Save(stream5);
                }
            }
        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            CreateThumbnail("changedImage.jpg", wb.Bitmap.Clone());
        }
    }
}