//Kod kreskowy Code 11
//(c) 2019 by Tomasz Lubinski
//www.algorytm.org

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Imaging;

namespace Barcodes.Code11
{
    public partial class Form1 : Form
    {
        private readonly char[] code11signs = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '-'};
 
        private readonly int[][] code11bars = 
        {
            new int[] {1, 0, 1, 0, 1, 1},
            new int[] {1, 1, 0, 1, 0, 1, 1},
            new int[] {1, 0, 0, 1, 0, 1, 1},
            new int[] {1, 1, 0, 0, 1, 0, 1},
            new int[] {1, 0, 1, 1, 0, 1, 1},
            new int[] {1, 1, 0, 1, 1, 0, 1},
            new int[] {1, 0, 0, 1, 1, 0, 1},
            new int[] {1, 0, 1, 0, 0, 1, 1},
            new int[] {1, 1, 0, 1, 0, 0, 1},
            new int[] {1, 1, 0, 1, 0, 1},
            new int[] {1, 0, 1, 1, 0, 1}
        };

        private readonly int[] start_stop = { 1, 0, 1, 1, 0, 0, 1 };

        /// <summary>
        /// Zainicjuj
        /// </summary>
        public Form1()
        {
            InitializeComponent();
            pictureBox.Image = new Bitmap(pictureBox.Width, pictureBox.Height, PixelFormat.Format24bppRgb);
            System.Drawing.SolidBrush whiteBrush = new System.Drawing.SolidBrush(System.Drawing.Color.White);
            System.Drawing.Graphics graphics = Graphics.FromImage(pictureBox.Image);
            graphics.FillRectangle(whiteBrush, new Rectangle(0, 0, pictureBox.Width, pictureBox.Height));
            pictureBox.Refresh();
            whiteBrush.Dispose();
            graphics.Dispose();
        }

        /// <summary>
        /// Sprawdza czy podany txt mozna zakodowac Code 11
        /// </summary>
        /// <param name="txt">tekst do zakodowania</param>
        /// <returns>true jezeli mozna zakodowac, false w przeciwnym razie</returns>
        public bool check(string txt)
        {
            for (int i = 0; i < txt.Length; i++)
            {
                if (checkLetter(txt[i]) == false)
                    return false;
            }
            return true;
        }

        /// <summary>
        /// Sprawdza czy podany znak mozna zakodowac Code 11
        /// </summary>
        /// <param name="ch">znak do zakodowania</param>
        /// <returns>true jezeli mozna zakodowac, false w przeciwnym razie</returns>
        private bool checkLetter(char ch)
        {
            for (int i = 0; i < code11signs.Length; i++)
            {
                if (code11signs[i] == ch)
                    return true;
            }
            return false;
        }

        /// <summary>
        /// Zwraca paski kodujace podany znak
        /// </summary>
        /// <param name="ch">znak do zakodowania</param>
        /// <returns>paski kodujace dany znak, null w przypadku niekodowalnych znakow</returns>
        public int[] getBars(char ch)
        {
            for (int i = 0; i < code11signs.Length; i++)
            {
                if (code11signs[i] == ch)
                    return code11bars[i];
            }
            return null;
        }

        /// <summary>
        /// Zwraca wartosc danego znaku
        /// </summary>
        /// <param name="ch">znak</param>
        /// <returns>wartosc danego znaku</returns>
        private int getLetterValue(char ch)
        {
            for (int i = 0; i < code11signs.Length; i++)
                if (code11signs[i] == ch)
                    return i;

            return 0;
        }

        /// <summary>
        /// Zwraca sume kontrolna C
        /// </summary>
        /// <param name="txt">kodowany ciag</param>
        /// <returns>suma kontrolna C</returns>
        private int checkDigitC(String txt)
        {
            int sum = 0;
            int w = 0;

            for (int i = txt.Length - 1; i >= 0; i--)
            {
                sum += (getLetterValue(txt[i]) * ((w % 10) + 1));
                w++;
            }

            return (sum % 11);
        }

        /// <summary>
        /// Zwraca sume kontrolna K
        /// </summary>
        /// <param name="txt">kodowany ciag</param>
        /// <returns>suma kontrolna K</returns>
        private int checkDigitK(String txt)
        {
            int sum = 0;
            int w = 0;

            for (int i = txt.Length - 1; i >= 0; i--)
            {
                sum += (getLetterValue(txt[i]) * ((w % 9) + 1));
                w++;
            }

            return (sum % 11);
        }

        /// <summary>
        /// Generuj Code 11
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Generate_Click(object sender, EventArgs e)
        {
            //Zainicjuj narzedzia do rysowania
            System.Drawing.SolidBrush whiteBrush = new System.Drawing.SolidBrush(System.Drawing.Color.White);
            System.Drawing.SolidBrush blackBrush = new System.Drawing.SolidBrush(System.Drawing.Color.Black);
            System.Drawing.Graphics graphics = Graphics.FromImage(pictureBox.Image);
            Font drawFont = new Font("Arial", 10);

            //Wyczysc obszar rysowania
            graphics.FillRectangle(whiteBrush, new Rectangle(0, 0, pictureBox.Width, pictureBox.Height));

            string code = Code.Text.Trim();
            if (check(code) == false)
            {
                MessageBox.Show("Nieprawidłowe znaki!", "Bład", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }

            //Wygeneruj i narysuj kod
            int[] bars = generateBars(ref code);
            for (int i = 0; i < bars.Length; i++)
            {
                if (bars[i] == 1)
                {
                    graphics.FillRectangle(blackBrush, i * 2 + 20, 10, 2, 90);
                }
            }

            //Wypisz cyfry pod kodem
            for (int i = 0; i < code.Length; i++)
            {
                graphics.DrawString(code.Substring(i, 1), drawFont, blackBrush, i * 15 + 37, 102);
            }


            //Odswiez
            pictureBox.Refresh();

            //Zwolinij zasoby
            whiteBrush.Dispose();
            blackBrush.Dispose();
            graphics.Dispose();
        }

        /// <summary>
        /// Generuje kod kreskowy
        /// </summary>
        /// <param name="code">string do zakodowania kodem kreskowym</param>
        /// <returns>kod kreskowy - 1 pasek czarny, 0 - pasek bialy</returns>
        private int[] generateBars(ref string code)
        {
            List<int> bars = new List<int>();

            //Dodaj znak start/stop
            bars.AddRange(start_stop);
            //Dodaj odstep
            bars.Add(0);                                        

            //Dodaj sume kontrolna C
            code += code11signs[checkDigitC(code)];

            //Jezeli kodujemy wiecej niz 9 znakow dodaj sume kontrolna K
            if (code.Length > 9) 
            {
                code += code11signs[checkDigitK(code)];
            }

            //Koduj kolejne znaki (lacznie z dodanymi sumami kontrolnymi)
            for (int i = 0; i < code.Length; i++)
            {
                bars.AddRange(code11bars[getLetterValue(code[i])]); //kodowany znak
                bars.Add(0);                                        //odstep
            }

            //Dodaj znak start/stop
            bars.AddRange(start_stop);
            
            return bars.ToArray();
        }
    }
}