using System;
using System.Text;
using iTextSharp.text;
using iTextSharp.text.error_messages;
/*
 * $Id: Barcode39.cs 222 2011-01-16 14:58:31Z psoares33 $
 *
 * This file is part of the iText project.
 * Copyright (c) 1998-2012 1T3XT BVBA
 * Authors: Bruno Lowagie, Paulo Soares, et al.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License version 3
 * as published by the Free Software Foundation with the addition of the
 * following permission added to Section 15 as permitted in Section 7(a):
 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY 1T3XT,
 * 1T3XT DISCLAIMS THE WARRANTY OF NON INFRINGEMENT OF THIRD PARTY RIGHTS.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Affero General Public License for more details.
 * You should have received a copy of the GNU Affero General Public License
 * along with this program; if not, see http://www.gnu.org/licenses or write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA, 02110-1301 USA, or download the license from the following URL:
 * http://itextpdf.com/terms-of-use/
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License.
 *
 * In accordance with Section 7(b) of the GNU Affero General Public License,
 * you must retain the producer line in every PDF that is created or manipulated
 * using iText.
 *
 * You can be released from the requirements of the license by purchasing
 * a commercial license. Buying such a license is mandatory as soon as you
 * develop commercial activities involving the iText software without
 * disclosing the source code of your own applications.
 * These activities include: offering paid services to customers as an ASP,
 * serving PDFs on the fly in a web application, shipping iText with a closed
 * source product.
 *
 * For more information, please contact iText Software Corp. at this
 * address: sales@itextpdf.com
 */
namespace iTextSharp.text.pdf {
    /** Implements the code 39 and code 39 extended. The default parameters are:
     * <pre>
     *x = 0.8f;
     *n = 2;
     *font = BaseFont.CreateFont("Helvetica", "winansi", false);
     *size = 8;
     *baseline = size;
     *barHeight = size * 3;
     *textint= Element.ALIGN_CENTER;
     *generateChecksum = false;
     *checksumText = false;
     *startStopText = true;
     *extended = false;
     * </pre>
     *
     * @author Paulo Soares
     */
    public class Barcode39 : Barcode {

        /** The bars to generate the code.
        */    
        private static readonly byte[][] BARS = 
        {
            new byte[] {0,0,0,1,1,0,1,0,0},
            new byte[] {1,0,0,1,0,0,0,0,1},
            new byte[] {0,0,1,1,0,0,0,0,1},
            new byte[] {1,0,1,1,0,0,0,0,0},
            new byte[] {0,0,0,1,1,0,0,0,1},
            new byte[] {1,0,0,1,1,0,0,0,0},
            new byte[] {0,0,1,1,1,0,0,0,0},
            new byte[] {0,0,0,1,0,0,1,0,1},
            new byte[] {1,0,0,1,0,0,1,0,0},
            new byte[] {0,0,1,1,0,0,1,0,0},
            new byte[] {1,0,0,0,0,1,0,0,1},
            new byte[] {0,0,1,0,0,1,0,0,1},
            new byte[] {1,0,1,0,0,1,0,0,0},
            new byte[] {0,0,0,0,1,1,0,0,1},
            new byte[] {1,0,0,0,1,1,0,0,0},
            new byte[] {0,0,1,0,1,1,0,0,0},
            new byte[] {0,0,0,0,0,1,1,0,1},
            new byte[] {1,0,0,0,0,1,1,0,0},
            new byte[] {0,0,1,0,0,1,1,0,0},
            new byte[] {0,0,0,0,1,1,1,0,0},
            new byte[] {1,0,0,0,0,0,0,1,1},
            new byte[] {0,0,1,0,0,0,0,1,1},
            new byte[] {1,0,1,0,0,0,0,1,0},
            new byte[] {0,0,0,0,1,0,0,1,1},
            new byte[] {1,0,0,0,1,0,0,1,0},
            new byte[] {0,0,1,0,1,0,0,1,0},
            new byte[] {0,0,0,0,0,0,1,1,1},
            new byte[] {1,0,0,0,0,0,1,1,0},
            new byte[] {0,0,1,0,0,0,1,1,0},
            new byte[] {0,0,0,0,1,0,1,1,0},
            new byte[] {1,1,0,0,0,0,0,0,1},
            new byte[] {0,1,1,0,0,0,0,0,1},
            new byte[] {1,1,1,0,0,0,0,0,0},
            new byte[] {0,1,0,0,1,0,0,0,1},
            new byte[] {1,1,0,0,1,0,0,0,0},
            new byte[] {0,1,1,0,1,0,0,0,0},
            new byte[] {0,1,0,0,0,0,1,0,1},
            new byte[] {1,1,0,0,0,0,1,0,0},
            new byte[] {0,1,1,0,0,0,1,0,0},
            new byte[] {0,1,0,1,0,1,0,0,0},
            new byte[] {0,1,0,1,0,0,0,1,0},
            new byte[] {0,1,0,0,0,1,0,1,0},
            new byte[] {0,0,0,1,0,1,0,1,0},
            new byte[] {0,1,0,0,1,0,1,0,0}
        };
     
        /** The index chars to <CODE>BARS</CODE>.
        */    
        private const string CHARS = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ-. $/+%*";
        
        /** The character combinations to make the code 39 extended.
        */    
        private const string EXTENDED = "%U" +
            "$A$B$C$D$E$F$G$H$I$J$K$L$M$N$O$P$Q$R$S$T$U$V$W$X$Y$Z" +
            "%A%B%C%D%E  /A/B/C/D/E/F/G/H/I/J/K/L - ./O" +
            " 0 1 2 3 4 5 6 7 8 9/Z%F%G%H%I%J%V" +
            " A B C D E F G H I J K L M N O P Q R S T U V W X Y Z" +
            "%K%L%M%N%O%W" +
            "+A+B+C+D+E+F+G+H+I+J+K+L+M+N+O+P+Q+R+S+T+U+V+W+X+Y+Z" +
            "%P%Q%R%S%T";
            
        /** Creates a new Barcode39.
        */    
        public Barcode39() {
            x = 0.8f;
            n = 2;
            font = BaseFont.CreateFont("Helvetica", "winansi", false);
            size = 8;
            baseline = size;
            barHeight = size * 3;
            textAlignment = Element.ALIGN_CENTER;
            generateChecksum = false;
            checksumText = false;
            startStopText = true;
            extended = false;
        }
        
        /** Creates the bars.
        * @param text the text to create the bars. This text does not include the start and
        * stop characters
        * @return the bars
        */    
        public static byte[] GetBarsCode39(string text) {
            text = "*" + text + "*";
            byte[] bars = new byte[text.Length * 10 - 1];
            for (int k = 0; k < text.Length; ++k) {
                int idx = CHARS.IndexOf(text[k]);
                if (idx < 0)
                    throw new ArgumentException(MessageLocalization.GetComposedMessage("the.character.1.is.illegal.in.code.39", text[k]));
                Array.Copy(BARS[idx], 0, bars, k * 10, 9);
            }
            return bars;
        }
        
        /** Converts the extended text into a normal, escaped text,
        * ready to generate bars.
        * @param text the extended text
        * @return the escaped text
        */    
        public static string GetCode39Ex(string text) {
            StringBuilder ret = new StringBuilder();
            for (int k = 0; k < text.Length; ++k) {
                char c = text[k];
                if (c > 127)
                    throw new ArgumentException(MessageLocalization.GetComposedMessage("the.character.1.is.illegal.in.code.39.extended", c));
                char c1 = EXTENDED[c * 2];
                char c2 = EXTENDED[c * 2 + 1];
                if (c1 != ' ')
                    ret.Append(c1);
                ret.Append(c2);
            }
            return ret.ToString();
        }
        
        /** Calculates the checksum.
        * @param text the text
        * @return the checksum
        */    
        internal static char GetChecksum(string text) {
            int chk = 0;
            for (int k = 0; k < text.Length; ++k) {
                int idx = CHARS.IndexOf(text[k]);
                if (idx < 0)
                    throw new ArgumentException(MessageLocalization.GetComposedMessage("the.character.1.is.illegal.in.code.39", text[k]));
                chk += idx;
            }
            return CHARS[chk % 43];
        }
        
        /** Gets the maximum area that the barcode and the text, if
        * any, will occupy. The lower left corner is always (0, 0).
        * @return the size the barcode occupies.
        */    
        public override Rectangle BarcodeSize {
            get {
                float fontX = 0;
                float fontY = 0;
                string fCode = code;
                if (extended)
                    fCode = GetCode39Ex(code);
                if (font != null) {
                    if (baseline > 0)
                        fontY = baseline - font.GetFontDescriptor(BaseFont.DESCENT, size);
                    else
                        fontY = -baseline + size;
                    string fullCode = code;
                    if (generateChecksum && checksumText)
                        fullCode += GetChecksum(fCode);
                    if (startStopText)
                        fullCode = "*" + fullCode + "*";
                    fontX = font.GetWidthPoint(altText != null ? altText : fullCode, size);
                }            
                int len = fCode.Length + 2;
                if (generateChecksum)
                    ++len;
                float fullWidth = len * (6 * x + 3 * x * n) + (len - 1) * x;
                fullWidth = Math.Max(fullWidth, fontX);
                float fullHeight = barHeight + fontY;
                return new Rectangle(fullWidth, fullHeight);
            }
        }
        
        /** Places the barcode in a <CODE>PdfContentByte</CODE>. The
        * barcode is always placed at coodinates (0, 0). Use the
        * translation matrix to move it elsewhere.<p>
        * The bars and text are written in the following colors:<p>
        * <P><TABLE BORDER=1>
        * <TR>
        *    <TH><P><CODE>barColor</CODE></TH>
        *    <TH><P><CODE>textColor</CODE></TH>
        *    <TH><P>Result</TH>
        *    </TR>
        * <TR>
        *    <TD><P><CODE>null</CODE></TD>
        *    <TD><P><CODE>null</CODE></TD>
        *    <TD><P>bars and text painted with current fill color</TD>
        *    </TR>
        * <TR>
        *    <TD><P><CODE>barColor</CODE></TD>
        *    <TD><P><CODE>null</CODE></TD>
        *    <TD><P>bars and text painted with <CODE>barColor</CODE></TD>
        *    </TR>
        * <TR>
        *    <TD><P><CODE>null</CODE></TD>
        *    <TD><P><CODE>textColor</CODE></TD>
        *    <TD><P>bars painted with current color<br>text painted with <CODE>textColor</CODE></TD>
        *    </TR>
        * <TR>
        *    <TD><P><CODE>barColor</CODE></TD>
        *    <TD><P><CODE>textColor</CODE></TD>
        *    <TD><P>bars painted with <CODE>barColor</CODE><br>text painted with <CODE>textColor</CODE></TD>
        *    </TR>
        * </TABLE>
        * @param cb the <CODE>PdfContentByte</CODE> where the barcode will be placed
        * @param barColor the color of the bars. It can be <CODE>null</CODE>
        * @param textColor the color of the text. It can be <CODE>null</CODE>
        * @return the dimensions the barcode occupies
        */    
        public override Rectangle PlaceBarcode(PdfContentByte cb, BaseColor barColor, BaseColor textColor) {
            string fullCode = code;
            float fontX = 0;
            string bCode = code;
            if (extended)
                bCode = GetCode39Ex(code);
            if (font != null) {
                if (generateChecksum && checksumText)
                    fullCode += GetChecksum(bCode);
                if (startStopText)
                    fullCode = "*" + fullCode + "*";
                fontX = font.GetWidthPoint(fullCode = altText != null ? altText : fullCode, size);
            }
            if (generateChecksum)
                bCode += GetChecksum(bCode);
            int len = bCode.Length + 2;
            float fullWidth = len * (6 * x + 3 * x * n) + (len - 1) * x;
            float barStartX = 0;
            float textStartX = 0;
            switch (textAlignment) {
                case Element.ALIGN_LEFT:
                    break;
                case Element.ALIGN_RIGHT:
                    if (fontX > fullWidth)
                        barStartX = fontX - fullWidth;
                    else
                        textStartX = fullWidth - fontX;
                    break;
                default:
                    if (fontX > fullWidth)
                        barStartX = (fontX - fullWidth) / 2;
                    else
                        textStartX = (fullWidth - fontX) / 2;
                    break;
            }
            float barStartY = 0;
            float textStartY = 0;
            if (font != null) {
                if (baseline <= 0)
                    textStartY = barHeight - baseline;
                else {
                    textStartY = -font.GetFontDescriptor(BaseFont.DESCENT, size);
                    barStartY = textStartY + baseline;
                }
            }
            byte[] bars = GetBarsCode39(bCode);
            bool print = true;
            if (barColor != null)
                cb.SetColorFill(barColor);
            for (int k = 0; k < bars.Length; ++k) {
                float w = (bars[k] == 0 ? x : x * n);
                if (print)
                    cb.Rectangle(barStartX, barStartY, w - inkSpreading, barHeight);
                print = !print;
                barStartX += w;
            }
            cb.Fill();
            if (font != null) {
                if (textColor != null)
                    cb.SetColorFill(textColor);
                cb.BeginText();
                cb.SetFontAndSize(font, size);
                cb.SetTextMatrix(textStartX, textStartY);
                cb.ShowText(fullCode);
                cb.EndText();
            }
            return this.BarcodeSize;
        }

        public override System.Drawing.Image CreateDrawingImage(System.Drawing.Color foreground, System.Drawing.Color background) {
            String bCode = code;
            if (extended)
                bCode = GetCode39Ex(code);
            if (generateChecksum)
                bCode += GetChecksum(bCode);
            int len = bCode.Length + 2;
            int nn = (int)n;
            int fullWidth = len * (6 + 3 * nn) + (len - 1);
            int height = (int)barHeight;
            System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(fullWidth, height);
            byte[] bars = GetBarsCode39(bCode);
            for (int h = 0; h < height; ++h) {
                bool print = true;
                int ptr = 0;
                for (int k = 0; k < bars.Length; ++k) {
                    int w = (bars[k] == 0 ? 1 : nn);
                    System.Drawing.Color c = background;
                    if (print)
                        c = foreground;
                    print = !print;
                    for (int j = 0; j < w; ++j)
                        bmp.SetPixel(ptr++, h, c);
                }
            }
            return bmp;
        }
    }
}
