/*
 * $Id: Document.java 4905 2011-06-08 12:26:03Z blowagie $
 *
 * This file is part of the iText (R) project.
 * Copyright (c) 1998-2011 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,
 * a covered work 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
 */
package com.itextpdf.text;

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;

import com.itextpdf.text.error_messages.MessageLocalization;

/**
 * A generic Document class.
 * <P>
 * All kinds of Text-elements can be added to a <CODE>HTMLDocument</CODE>.
 * The <CODE>Document</CODE> signals all the listeners when an element has
 * been added.
 * <P>
 * Remark:
 * <OL>
 *     <LI>Once a document is created you can add some meta information.
 *     <LI>You can also set the headers/footers.
 *     <LI>You have to open the document before you can write content.
 * <LI>You can only write content (no more meta-formation!) once a document is
 * opened.
 * <LI>When you change the header/footer on a certain page, this will be
 * effective starting on the next page.
 * <LI>After closing the document, every listener (as well as its <CODE>
 * OutputStream</CODE>) is closed too.
 * </OL>
 * Example: <BLOCKQUOTE>
 *
 * <PRE>// creation of the document with a certain size and certain margins
 * <STRONG>Document document = new Document(PageSize.A4, 50, 50, 50, 50);
 * </STRONG> try {
 *   // creation of the different writers
 *   HtmlWriter.getInstance(<STRONG>document </STRONG>, System.out);
 *   PdfWriter.getInstance(<STRONG>document </STRONG>, new FileOutputStream("text.pdf"));
 *   // we add some meta information to the document
 *   <STRONG>document.addAuthor("Bruno Lowagie"); </STRONG>
 *   <STRONG>document.addSubject("This is the result of a Test."); </STRONG>
 *   // we open the document for writing
 *   <STRONG>document.open(); </STRONG>
 *   <STRONG>document.add(new Paragraph("Hello world"));</STRONG>
 *  } catch(DocumentException de) {
 *   System.err.println(de.getMessage());
 *  }
 *  <STRONG>document.close();</STRONG>
 * </PRE>
 *
 * </BLOCKQUOTE>
 */

public class Document implements DocListener {

    // membervariables
    /**
     * This constant contains the name of the product.
     * iText is a registered trademark.
     * Please don't change this constant.
     * @since   2.1.6
     */
        private static final String ITEXT = "iText\u00ae";
    /**
     * This constant contains the version number of this iText release.
     * For debugging purposes, we request you NOT to change this constant.
     * @since   2.1.6
     */
        private static final String RELEASE = "5.1.2-SNAPSHOT";
        /**
         * This constant the iText version as shown in the producer line.
         * iText is a product developed by 1T3XT BVBA.
         * 1T3XT requests that you retain the iText producer line
         * in every PDF that is created or manipulated using iText.
         */
        private static final String ITEXT_VERSION = ITEXT + " " + RELEASE + " \u00a92000-2011 1T3XT BVBA";

        /**
         * Allows the pdf documents to be produced without compression for debugging
         * purposes.
         */
    public static boolean compress = true;

        /**
         * When true the file access is not done through a memory mapped file. Use it if the file
     * is too big to be mapped in your address space.
         */
    public static boolean plainRandomAccess = false;

    /** Scales the WMF font size. The default value is 0.86. */
    public static float wmfFontCorrection = 0.86f;

        /**
         * The DocListener.
         * @since iText 5.1.0 changed from private to protected
         */
    protected ArrayList<DocListener> listeners = new ArrayList<DocListener>();

        /** Is the document open or not? */
    protected boolean open;

        /** Has the document already been closed? */
    protected boolean close;

    // membervariables concerning the layout

        /** The size of the page. */
    protected Rectangle pageSize;

        /** margin in x direction starting from the left */
    protected float marginLeft = 0;

        /** margin in x direction starting from the right */
    protected float marginRight = 0;

        /** margin in y direction starting from the top */
    protected float marginTop = 0;

        /** margin in y direction starting from the bottom */
    protected float marginBottom = 0;

    /** mirroring of the left/right margins */
    protected boolean marginMirroring = false;

    /**
     * mirroring of the top/bottom margins
     * @since   2.1.6
     */
    protected boolean marginMirroringTopBottom = false;

        /** Content of JavaScript onLoad function */
    protected String javaScript_onLoad = null;

        /** Content of JavaScript onUnLoad function */
    protected String javaScript_onUnLoad = null;

        /** Style class in HTML body tag */
    protected String htmlStyleClass = null;

    // headers, footers

        /** Current pagenumber */
    protected int pageN = 0;

    /** This is a chapter number in case ChapterAutoNumber is used. */
    protected int chapternumber = 0;

    // constructor

        /**
         * Constructs a new <CODE>Document</CODE> -object.
 */

    public Document() {
        this(PageSize.A4);
    }

        /**
         * Constructs a new <CODE>Document</CODE> -object.
 *
         * @param pageSize
         *            the pageSize
 */

    public Document(Rectangle pageSize) {
        this(pageSize, 36, 36, 36, 36);
    }

        /**
         * Constructs a new <CODE>Document</CODE> -object.
 *
         * @param pageSize
         *            the pageSize
         * @param marginLeft
         *            the margin on the left
         * @param marginRight
         *            the margin on the right
         * @param marginTop
         *            the margin on the top
         * @param marginBottom
         *            the margin on the bottom
 */

        public Document(Rectangle pageSize, float marginLeft, float marginRight,
                        float marginTop, float marginBottom) {
        this.pageSize = pageSize;
        this.marginLeft = marginLeft;
        this.marginRight = marginRight;
        this.marginTop = marginTop;
        this.marginBottom = marginBottom;
    }

    // listener methods

        /**
 * Adds a <CODE>DocListener</CODE> to the <CODE>Document</CODE>.
 *
         * @param listener
         *            the new DocListener.
 */

    public void addDocListener(DocListener listener) {
        listeners.add(listener);
    }

        /**
 * Removes a <CODE>DocListener</CODE> from the <CODE>Document</CODE>.
 *
         * @param listener
         *            the DocListener that has to be removed.
 */

    public void removeDocListener(DocListener listener) {
        listeners.remove(listener);
    }

    // methods implementing the DocListener interface

        /**
         * Adds an <CODE>Element</CODE> to the <CODE>Document</CODE>.
 *
         * @param element
         *            the <CODE>Element</CODE> to add
         * @return <CODE>true</CODE> if the element was added, <CODE>false
         *         </CODE> if not
         * @throws DocumentException
         *             when a document isn't open yet, or has been closed
 */

    public boolean add(Element element) throws DocumentException {
        if (close) {
                        throw new DocumentException(MessageLocalization.getComposedMessage("the.document.has.been.closed.you.can.t.add.any.elements"));
        }
                if (!open && element.isContent()) {
                        throw new DocumentException(MessageLocalization.getComposedMessage("the.document.is.not.open.yet.you.can.only.add.meta.information"));
        }
        boolean success = false;
        if (element instanceof ChapterAutoNumber) {
                chapternumber = ((ChapterAutoNumber)element).setAutomaticNumber(chapternumber);
        }
        for (DocListener listener : listeners) {
            success |= listener.add(element);
        }
                if (element instanceof LargeElement) {
                        LargeElement e = (LargeElement)element;
                        if (!e.isComplete())
                                e.flushContent();
                }
        return success;
    }

        /**
 * Opens the document.
 * <P>
         * Once the document is opened, you can't write any Header- or
         * Meta-information anymore. You have to open the document before you can
         * begin to add content to the body of the document.
 */

    public void open() {
                if (!close) {
            open = true;
        }
                for (DocListener listener : listeners) {
            listener.setPageSize(pageSize);
                        listener.setMargins(marginLeft, marginRight, marginTop,
                                        marginBottom);
            listener.open();
        }
    }

        /**
 * Sets the pagesize.
 *
         * @param pageSize
         *            the new pagesize
 * @return      a <CODE>boolean</CODE>
 */

    public boolean setPageSize(Rectangle pageSize) {
        this.pageSize = pageSize;
                for (DocListener listener : listeners) {
            listener.setPageSize(pageSize);
        }
        return true;
    }

        /**
 * Sets the margins.
 *
         * @param marginLeft
         *            the margin on the left
         * @param marginRight
         *            the margin on the right
         * @param marginTop
         *            the margin on the top
         * @param marginBottom
         *            the margin on the bottom
 * @return      a <CODE>boolean</CODE>
 */

        public boolean setMargins(float marginLeft, float marginRight,
                        float marginTop, float marginBottom) {
        this.marginLeft = marginLeft;
        this.marginRight = marginRight;
        this.marginTop = marginTop;
        this.marginBottom = marginBottom;
                for (DocListener listener : listeners) {
                        listener.setMargins(marginLeft, marginRight, marginTop,
                                        marginBottom);
        }
        return true;
    }

        /**
 * Signals that an new page has to be started.
 *
         * @return <CODE>true</CODE> if the page was added, <CODE>false</CODE>
         *         if not.
 */

    public boolean newPage() {
        if (!open || close) {
            return false;
        }
        for (DocListener listener : listeners) {
            listener.newPage();
        }
        return true;
    }

        /**
 * Sets the page number to 0.
 */

    public void resetPageCount() {
        pageN = 0;
        for (DocListener listener: listeners) {
            listener.resetPageCount();
        }
    }

        /**
 * Sets the page number.
 *
         * @param pageN
         *            the new page number
 */

    public void setPageCount(int pageN) {
        this.pageN = pageN;
        for (DocListener listener: listeners) {
            listener.setPageCount(pageN);
        }
    }

        /**
 * Returns the current page number.
 *
 * @return the current page number
 */

    public int getPageNumber() {
        return this.pageN;
    }

        /**
 * Closes the document.
 * <P>
         * Once all the content has been written in the body, you have to close the
         * body. After that nothing can be written to the body anymore.
 */

    public void close() {
                if (!close) {
            open = false;
            close = true;
        }
                for (DocListener listener : listeners) {
            listener.close();
        }
    }

    // methods concerning the header or some meta information

        /**
 * Adds a user defined header to the document.
 *
         * @param name
         *            the name of the header
         * @param content
         *            the content of the header
 * @return      <CODE>true</CODE> if successful, <CODE>false</CODE> otherwise
 */

    public boolean addHeader(String name, String content) {
        try {
            return add(new Header(name, content));
                } catch (DocumentException de) {
            throw new ExceptionConverter(de);
        }
    }

        /**
 * Adds the title to a Document.
 *
         * @param title
         *            the title
 * @return      <CODE>true</CODE> if successful, <CODE>false</CODE> otherwise
 */

    public boolean addTitle(String title) {
        try {
            return add(new Meta(Element.TITLE, title));
                } catch (DocumentException de) {
            throw new ExceptionConverter(de);
        }
    }

        /**
 * Adds the subject to a Document.
 *
         * @param subject
         *            the subject
 * @return      <CODE>true</CODE> if successful, <CODE>false</CODE> otherwise
 */

    public boolean addSubject(String subject) {
        try {
            return add(new Meta(Element.SUBJECT, subject));
                } catch (DocumentException de) {
            throw new ExceptionConverter(de);
        }
    }

        /**
 * Adds the keywords to a Document.
 *
         * @param keywords
         *            adds the keywords to the document
 * @return <CODE>true</CODE> if successful, <CODE>false</CODE> otherwise
 */

    public boolean addKeywords(String keywords) {
        try {
            return add(new Meta(Element.KEYWORDS, keywords));
                } catch (DocumentException de) {
            throw new ExceptionConverter(de);
        }
    }

        /**
 * Adds the author to a Document.
 *
         * @param author
         *            the name of the author
 * @return      <CODE>true</CODE> if successful, <CODE>false</CODE> otherwise
 */

    public boolean addAuthor(String author) {
        try {
            return add(new Meta(Element.AUTHOR, author));
                } catch (DocumentException de) {
            throw new ExceptionConverter(de);
        }
    }

        /**
 * Adds the creator to a Document.
 *
         * @param creator
         *            the name of the creator
 * @return      <CODE>true</CODE> if successful, <CODE>false</CODE> otherwise
 */

    public boolean addCreator(String creator) {
        try {
            return add(new Meta(Element.CREATOR, creator));
                } catch (DocumentException de) {
            throw new ExceptionConverter(de);
        }
    }

        /**
 * Adds the producer to a Document.
 *
 * @return      <CODE>true</CODE> if successful, <CODE>false</CODE> otherwise
 */

    public boolean addProducer() {
        try {
            return add(new Meta(Element.PRODUCER, getVersion()));
                } catch (DocumentException de) {
            throw new ExceptionConverter(de);
        }
    }

        /**
 * Adds the current date and time to a Document.
 *
 * @return      <CODE>true</CODE> if successful, <CODE>false</CODE> otherwise
 */

    public boolean addCreationDate() {
        try {
                        /* bugfix by 'taqua' (Thomas) */
                        final SimpleDateFormat sdf = new SimpleDateFormat(
                                        "EEE MMM dd HH:mm:ss zzz yyyy");
                        return add(new Meta(Element.CREATIONDATE, sdf.format(new Date())));
                } catch (DocumentException de) {
            throw new ExceptionConverter(de);
        }
    }

    // methods to get the layout of the document.

        /**
 * Returns the left margin.
 *
 * @return      the left margin
 */

    public float leftMargin() {
        return marginLeft;
    }

        /**
 * Return the right margin.
 *
 * @return      the right margin
 */

    public float rightMargin() {
        return marginRight;
    }

        /**
 * Returns the top margin.
 *
 * @return      the top margin
 */

    public float topMargin() {
        return marginTop;
    }

        /**
 * Returns the bottom margin.
 *
 * @return      the bottom margin
 */

    public float bottomMargin() {
        return marginBottom;
    }

        /**
 * Returns the lower left x-coordinate.
 *
 * @return      the lower left x-coordinate
 */

    public float left() {
        return pageSize.getLeft(marginLeft);
    }

        /**
 * Returns the upper right x-coordinate.
 *
 * @return      the upper right x-coordinate
 */

    public float right() {
        return pageSize.getRight(marginRight);
    }

        /**
 * Returns the upper right y-coordinate.
 *
 * @return      the upper right y-coordinate
 */

    public float top() {
        return pageSize.getTop(marginTop);
    }

        /**
 * Returns the lower left y-coordinate.
 *
 * @return      the lower left y-coordinate
 */

    public float bottom() {
        return pageSize.getBottom(marginBottom);
    }

        /**
 * Returns the lower left x-coordinate considering a given margin.
 *
         * @param margin
         *            a margin
 * @return      the lower left x-coordinate
 */

    public float left(float margin) {
        return pageSize.getLeft(marginLeft + margin);
    }

        /**
 * Returns the upper right x-coordinate, considering a given margin.
 *
         * @param margin
         *            a margin
 * @return      the upper right x-coordinate
 */

    public float right(float margin) {
        return pageSize.getRight(marginRight + margin);
    }

        /**
 * Returns the upper right y-coordinate, considering a given margin.
 *
         * @param margin
         *            a margin
 * @return      the upper right y-coordinate
 */

    public float top(float margin) {
        return pageSize.getTop(marginTop + margin);
    }

        /**
 * Returns the lower left y-coordinate, considering a given margin.
 *
         * @param margin
         *            a margin
 * @return      the lower left y-coordinate
 */

    public float bottom(float margin) {
        return pageSize.getBottom(marginBottom + margin);
    }

        /**
 * Gets the pagesize.
         *
 * @return the page size
 */

        public Rectangle getPageSize() {
        return this.pageSize;
    }

        /**
         * Checks if the document is open.
         *
     * @return <CODE>true</CODE> if the document is open
     */
    public boolean isOpen() {
        return open;
    }

        /**
         * Gets the product name.
         * This method may only be changed by Paulo Soares and/or Bruno Lowagie.
     * @return the product name
     * @since   2.1.6
     */
    public static final String getProduct() {
        return ITEXT;
    }

        /**
         * Gets the release number.
         * This method may only be changed by Paulo Soares and/or Bruno Lowagie.
     * @return the product name
     * @since   2.1.6
     */
    public static final String getRelease() {
        return RELEASE;
    }

        /**
         * Returns the iText version as shown in the producer line.
         * iText is a product developed by 1T3XT BVBA.
         * 1T3XT requests that you retain the iText producer line
         * in every PDF that is created or manipulated using iText.
     * @return iText version
     */
    public static final String getVersion() {
        return ITEXT_VERSION;
    }

        /**
 * Adds a JavaScript onLoad function to the HTML body tag
 *
         * @param code
         *            the JavaScript code to be executed on load of the HTML page
 */

    public void setJavaScript_onLoad(String code) {
        this.javaScript_onLoad = code;
    }

        /**
 * Gets the JavaScript onLoad command.
         *
 * @return the JavaScript onLoad command
 */

    public String getJavaScript_onLoad() {
        return this.javaScript_onLoad;
    }

        /**
 * Adds a JavaScript onUnLoad function to the HTML body tag
 *
         * @param code
         *            the JavaScript code to be executed on unload of the HTML page
 */

    public void setJavaScript_onUnLoad(String code) {
        this.javaScript_onUnLoad = code;
    }

        /**
 * Gets the JavaScript onUnLoad command.
         *
 * @return the JavaScript onUnLoad command
 */

    public String getJavaScript_onUnLoad() {
        return this.javaScript_onUnLoad;
    }

        /**
 * Adds a style class to the HTML body tag
 *
         * @param htmlStyleClass
         *            the style class for the HTML body tag
 */

    public void setHtmlStyleClass(String htmlStyleClass) {
        this.htmlStyleClass = htmlStyleClass;
    }

        /**
 * Gets the style class of the HTML body tag
 *
 * @return              the style class of the HTML body tag
 */

    public String getHtmlStyleClass() {
        return this.htmlStyleClass;
    }

    /**
     * Set the margin mirroring. It will mirror right/left margins for odd/even pages.
         *
         * @param marginMirroring
         *            <CODE>true</CODE> to mirror the margins
     * @return always <CODE>true</CODE>
     */
    public boolean setMarginMirroring(boolean marginMirroring) {
        this.marginMirroring = marginMirroring;
        DocListener listener;
                for (Object element : listeners) {
            listener = (DocListener) element;
            listener.setMarginMirroring(marginMirroring);
        }
        return true;
    }

    /**
     * Set the margin mirroring. It will mirror top/bottom margins for odd/even pages.
         *
         * @param marginMirroringTopBottom
         *            <CODE>true</CODE> to mirror the margins
     * @return always <CODE>true</CODE>
     * @since   2.1.6
     */
    public boolean setMarginMirroringTopBottom(boolean marginMirroringTopBottom) {
        this.marginMirroringTopBottom = marginMirroringTopBottom;
        DocListener listener;
                for (Object element : listeners) {
            listener = (DocListener) element;
            listener.setMarginMirroringTopBottom(marginMirroringTopBottom);
        }
        return true;
    }

    /**
     * Gets the margin mirroring flag.
         *
     * @return the margin mirroring flag
     */
    public boolean isMarginMirroring() {
        return marginMirroring;
    }
}