using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace AnalizaObrazow
{
    public partial class MainForm : Form
    {
        private Bitmap img = null;
        private bool isGrayScale = false;

        public MainForm()
        {
            InitializeComponent();
        }

        private void panel1_Paint(object sender, PaintEventArgs e)
        {

        }

        private void mainPanel_Paint(object sender, PaintEventArgs e)
        {

        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void btFileOpen_Click(object sender, EventArgs e)
        {
            // otwieranie okna dialogowego z plikami
            OpenFileDialog open = new OpenFileDialog();

            // filtry obrazu
            open.Filter = "Image Files(*.jpg; *.jpeg; *.gif; *.bmp; *.png)|*.jpg; *.jpeg; *.gif; *.bmp; *.png";
            if(open.ShowDialog() == DialogResult.OK)
            {
                // wyświetlanie obrazka w picture box
                img = new Bitmap(open.FileName);
                bitmap.Image = img;
                isGrayScale = false;
            }
        }

        private void btFileSave_Click(object sender, EventArgs e)
        {
            // otwieranie okna dialogowego zapisu
            SaveFileDialog save = new SaveFileDialog();

            // filtry obrazu
            save.Filter = "Image Files(*.jpg; *.jpeg; *.gif; *.bmp; *.png)|*.jpg; *.jpeg; *.gif; *.bmp; *.png";

            if (save.ShowDialog() == DialogResult.OK)
            {
                bitmap.Image.Save(save.FileName);
            }
        }

        private void btFileNew_Click(object sender, EventArgs e)
        {
            bitmap.Image = null;
            isGrayScale = false;
        }

        // przeciąganie formularza po ekranie
        [DllImport("user32.DLL", EntryPoint = "ReleaseCapture")]
        private extern static void ReleaseCapture();

        [DllImport("user32.DLL", EntryPoint = "SendMessage")]
        private extern static void SendMessage(IntPtr hWnd, int wMsg, int wParam, int lParam);

        private void panelHeader_MouseDown(object sender, MouseEventArgs e)
        {
            if (btFullscreen.IconChar == FontAwesome.Sharp.IconChar.WindowRestore)
            {
                btFullscreen.IconChar = FontAwesome.Sharp.IconChar.WindowMaximize;
            }

            ReleaseCapture();
            SendMessage(this.Handle, 0x112, 0xf012, 0);
        }

        private void btClose_Click(object sender, EventArgs e)
        {
            this.Close();
            Application.Exit();
        }

        private void btFullscreen_Click(object sender, EventArgs e)
        {
            if (this.WindowState == FormWindowState.Normal)
            {
                this.WindowState = FormWindowState.Maximized;
                btFullscreen.IconChar = FontAwesome.Sharp.IconChar.WindowRestore;

            }
            else if (this.WindowState == FormWindowState.Maximized)
            {
                this.WindowState = FormWindowState.Normal;
                btFullscreen.IconChar = FontAwesome.Sharp.IconChar.WindowMaximize;
            }
        }

        private void btMinimize_Click(object sender, EventArgs e)
        {
            this.WindowState = FormWindowState.Minimized;
        }

        private void btEdit_Click(object sender, EventArgs e)
        {
            // zmiana wygladu przyciskow
            btEdit.BackColor = Color.FromArgb(43, 43, 43);
            btEdit.ForeColor = Color.FromArgb(255, 255, 255);
            btFile.BackColor = Color.FromArgb(210, 19, 19);
        }

        private void btGrayscale_Click(object sender, EventArgs e)
        {
            if(img != null)
            {
                for (int x = 0; x < img.Width; x++)
                {
                    for (int y = 0; y < img.Height; y++)
                    {
                        Color color = img.GetPixel(x, y);
                        byte red = (byte)(color.R * 0.299);
                        byte green = (byte)(color.G * 0.587);
                        byte blue = (byte)(color.B * 0.114);
                        int grayScale = red + green + blue;
                        color = Color.FromArgb(grayScale, grayScale, grayScale);
                        img.SetPixel(x, y, color);
                    }
                }
                isGrayScale = true;
                bitmap.Image = img;
            }
        }

        private void btHistogram_Click(object sender, EventArgs e)
        {
            if (isGrayScale)
            {
                int[] pixelsGrayScale = new int[256];
                foreach (int i in pixelsGrayScale)
                {
                    pixelsGrayScale[i] = 0;
                }

                for(int x = 0; x < img.Width; x++)
                {
                    for(int y = 0; y < img.Height; y++)
                    {
                        Color color = img.GetPixel(x, y);
                        byte grayLevel = color.R;
                        Console.WriteLine(grayLevel);
                        pixelsGrayScale[grayLevel] += 1;
                    }
                }

                GrayscaleHistogramForm histogramForm = new GrayscaleHistogramForm(pixelsGrayScale);
                histogramForm.Show();
            }
        }
    }
}