/*
 * $Id$
 *
 * Copyright 1999, 2000, 2001, 2002 by Bruno Lowagie.
 *
 * The contents of this file are subject to the Mozilla Public License Version 1.1
 * (the "License"); you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the License.
 *
 * The Original Code is 'iText, a free JAVA-PDF library'.
 *
 * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
 * the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
 * All Rights Reserved.
 * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
 * are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
 *
 * Contributor(s): all the names of the contributors are added in the source code
 * where applicable.
 *
 * Alternatively, the contents of this file may be used under the terms of the
 * LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
 * provisions of LGPL are applicable instead of those above.  If you wish to
 * allow use of your version of this file only under the terms of the LGPL
 * License and not to allow others to use your version of this file under
 * the MPL, indicate your decision by deleting the provisions above and
 * replace them with the notice and other provisions required by the LGPL.
 * If you do not delete the provisions above, a recipient may use your version
 * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the MPL as stated above or under the terms of the GNU
 * Library General Public License as published by the Free Software Foundation;
 * either version 2 of the License, or any later version.
 *
 * This library 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 Library general Public License for more
 * details.
 *
 * If you didn't download this code from the following link, you should check if
 * you aren't using an obsolete version:
 * http://www.lowagie.com/iText/
 */

package com.lowagie.text;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;

/**
 * A <CODE>Section</CODE> is a part of a <CODE>Document</CODE> containing
 * other <CODE>Section</CODE>s, <CODE>Paragraph</CODE>s, <CODE>List</CODE>
 * and/or <CODE>Table</CODE>s.
 * <P>
 * Remark: you can not construct a <CODE>Section</CODE> yourself.
 * You will have to ask an instance of <CODE>Section</CODE> to the
 * <CODE>Chapter</CODE> or <CODE>Section</CODE> to which you want to
 * add the new <CODE>Section</CODE>.
 * <P>
 * Example:
 * <BLOCKQUOTE><PRE>
 * Paragraph title2 = new Paragraph("This is Chapter 2", FontFactory.getFont(FontFactory.HELVETICA, 18, Font.BOLDITALIC, new Color(0, 0, 255)));
 * Chapter chapter2 = new Chapter(title2, 2);
 * Paragraph someText = new Paragraph("This is some text");
 * chapter2.add(someText);
 * Paragraph title21 = new Paragraph("This is Section 1 in Chapter 2", FontFactory.getFont(FontFactory.HELVETICA, 16, Font.BOLD, new Color(255, 0, 0)));
 * <STRONG>Section section1 = chapter2.addSection(title21);</STRONG>
 * Paragraph someSectionText = new Paragraph("This is some silly paragraph in a chapter and/or section. It contains some text to test the functionality of Chapters and Section.");
 * <STRONG>section1.add(someSectionText);</STRONG>
 * Paragraph title211 = new Paragraph("This is SubSection 1 in Section 1 in Chapter 2", FontFactory.getFont(FontFactory.HELVETICA, 14, Font.BOLD, new Color(255, 0, 0)));
 * <STRONG>Section section11 = section1.addSection(40, title211, 2);</STRONG>
 * <STRONG>section11.add(someSectionText);</STRONG>
 * </PRE></BLOCKQUOTE>
 */

public class Section extends ArrayList implements TextElementArray, LargeElement {
    // constant
	/**
	 * A possible number style. The default number style: "1.2.3."
	 * @since	iText 2.0.8
	 */
	public static final int NUMBERSTYLE_DOTTED = 0;
	/**
	 * A possible number style. For instance: "1.2.3"
	 * @since	iText 2.0.8
	 */
	public static final int NUMBERSTYLE_DOTTED_WITHOUT_FINAL_DOT = 1;
	
	/** A serial version uid. */
	private static final long serialVersionUID = 3324172577544748043L;

	// member variables
	
	/** The title of this section. */
    protected Paragraph title;
    
    /** The bookmark title if different from the content title */
    protected String bookmarkTitle;

    /** The number of sectionnumbers that has to be shown before the section title. */
    protected int numberDepth;
    
    /**
     * The style for sectionnumbers.
     * @since	iText 2.0.8
     */
    protected int numberStyle = NUMBERSTYLE_DOTTED;
    
    /** The indentation of this section on the left side. */
    protected float indentationLeft;
    
    /** The indentation of this section on the right side. */
    protected float indentationRight;
    
    /** The additional indentation of the content of this section. */
    protected float indentation;
    
    /** false if the bookmark children are not visible */
    protected boolean bookmarkOpen = true;
    
    /** true if the section has to trigger a new page */
    protected boolean triggerNewPage = false;
    
    /** This is the number of subsections. */
    protected int subsections = 0;
    
    /** This is the complete list of sectionnumbers of this section and the parents of this section. */
    protected ArrayList numbers = null;
    
    /**
     * Indicates if the Section will be complete once added to the document.
     * @since	iText 2.0.8
     */
    protected boolean complete = true;
    
    /**
     * Indicates if the Section was added completely to the document.
     * @since	iText 2.0.8
     */
    protected boolean addedCompletely = false;
    
    /**
     * Indicates if this is the first time the section was added.
     * @since	iText 2.0.8
     */
    protected boolean notAddedYet = true;
    
    // constructors
    
    /**
     * Constructs a new <CODE>Section</CODE>.
     */    
    protected Section() {
        title = new Paragraph();
        numberDepth = 1;
    }
    
    /**
     * Constructs a new <CODE>Section</CODE>.
     *
     * @param	title			a <CODE>Paragraph</CODE>
     * @param	numberDepth		the numberDepth
     */
    protected Section(Paragraph title, int numberDepth) {
        this.numberDepth = numberDepth;
        this.title = title;
    }
    
    // implementation of the Element-methods
    
    /**
     * Processes the element by adding it (or the different parts) to an
     * <CODE>ElementListener</CODE>.
     *
     * @param	listener		the <CODE>ElementListener</CODE>
     * @return	<CODE>true</CODE> if the element was processed successfully
     */
    public boolean process(ElementListener listener) {
        try {
        	Element element;
            for (Iterator i = iterator(); i.hasNext(); ) {
            	element = (Element)i.next();
                listener.add(element);
            }
            return true;
        }
        catch(DocumentException de) {
            return false;
        }
    }
    
    /**
     * Gets the type of the text element.
     *
     * @return	a type
     */    
    public int type() {
        return Element.SECTION;
    }
    
    /**
     * Checks if this object is a <CODE>Chapter</CODE>.
     *
     * @return	<CODE>true</CODE> if it is a <CODE>Chapter</CODE>,
     *			<CODE>false</CODE> if it is a <CODE>Section</CODE>.
     */
    public boolean isChapter() {
        return type() == Element.CHAPTER;
    }
    
    /**
     * Checks if this object is a <CODE>Section</CODE>.
     *
     * @return	<CODE>true</CODE> if it is a <CODE>Section</CODE>,
     *			<CODE>false</CODE> if it is a <CODE>Chapter</CODE>.
     */
    public boolean isSection() {
        return type() == Element.SECTION;
    }
    
    /**
     * Gets all the chunks in this element.
     *
     * @return	an <CODE>ArrayList</CODE>
     */
    public ArrayList getChunks() {
        ArrayList tmp = new ArrayList();
        for (Iterator i = iterator(); i.hasNext(); ) {
            tmp.addAll(((Element) i.next()).getChunks());
        }
        return tmp;
    }
	
	/**
	 * @see com.lowagie.text.Element#isContent()
	 * @since	iText 2.0.8
	 */
	public boolean isContent() {
		return true;
	}

	/**
	 * @see com.lowagie.text.Element#isNestable()
	 * @since	iText 2.0.8
	 */
	public boolean isNestable() {
		return false;
	}
    
    // overriding some of the ArrayList-methods
    
    /**
     * Adds a <CODE>Paragraph</CODE>, <CODE>List</CODE> or <CODE>Table</CODE>
     * to this <CODE>Section</CODE>.
     *
     * @param	index	index at which the specified element is to be inserted
     * @param	o   	an object of type <CODE>Paragraph</CODE>, <CODE>List</CODE> or <CODE>Table</CODE>=
     * @throws	ClassCastException if the object is not a <CODE>Paragraph</CODE>, <CODE>List</CODE> or <CODE>Table</CODE>
     */
    public void add(int index, Object o) {
    	if (isAddedCompletely()) {
    		throw new IllegalStateException("This LargeElement has already been added to the Document.");
    	}
        try {
            Element element = (Element) o;
            if (element.isNestable()) {
                super.add(index, element);
            }
            else {
                throw new ClassCastException("You can't add a " + element.getClass().getName() + " to a Section.");
            }
        }
        catch(ClassCastException cce) {
            throw new ClassCastException("Insertion of illegal Element: " + cce.getMessage());
        }
    }
    
    /**
     * Adds a <CODE>Paragraph</CODE>, <CODE>List</CODE>, <CODE>Table</CODE> or another <CODE>Section</CODE>
     * to this <CODE>Section</CODE>.
     *
     * @param	o   	an object of type <CODE>Paragraph</CODE>, <CODE>List</CODE>, <CODE>Table</CODE> or another <CODE>Section</CODE>
     * @return	a boolean
     * @throws	ClassCastException if the object is not a <CODE>Paragraph</CODE>, <CODE>List</CODE>, <CODE>Table</CODE> or <CODE>Section</CODE>
     */
    public boolean add(Object o) {
    	if (isAddedCompletely()) {
    		throw new IllegalStateException("This LargeElement has already been added to the Document.");
    	}
        try {
            Element element = (Element) o;
            if (element.type() == Element.SECTION) {
                Section section = (Section) o;
                section.setNumbers(++subsections, numbers);
                return super.add(section);
            }
            else if (o instanceof MarkedSection && ((MarkedObject)o).element.type() == Element.SECTION) {
            	MarkedSection mo = (MarkedSection)o;
            	Section section = (Section)mo.element;
            	section.setNumbers(++subsections, numbers);
            	return super.add(mo);
            }
            else if (element.isNestable()) {
            	return super.add(o);
            }
            else {
                throw new ClassCastException("You can't add a " + element.getClass().getName() + " to a Section.");
            }
        }
        catch(ClassCastException cce) {
            throw new ClassCastException("Insertion of illegal Element: " + cce.getMessage());
        }
    }
    
    /**
     * Adds a collection of <CODE>Element</CODE>s
     * to this <CODE>Section</CODE>.
     *
     * @param	collection	a collection of <CODE>Paragraph</CODE>s, <CODE>List</CODE>s and/or <CODE>Table</CODE>s
     * @return	<CODE>true</CODE> if the action succeeded, <CODE>false</CODE> if not.
     * @throws	ClassCastException if one of the objects isn't a <CODE>Paragraph</CODE>, <CODE>List</CODE>, <CODE>Table</CODE>
     */
    public boolean addAll(Collection collection) {
        for (Iterator iterator = collection.iterator(); iterator.hasNext(); ) {
            this.add(iterator.next());
        }
        return true;
    }
    
    // methods that return a Section
    
    /**
     * Creates a <CODE>Section</CODE>, adds it to this <CODE>Section</CODE> and returns it.
     *
     * @param	indentation	the indentation of the new section
     * @param	title		the title of the new section
     * @param	numberDepth	the numberDepth of the section
     * @return  a new Section object
     */
    public Section addSection(float indentation, Paragraph title, int numberDepth) {
    	if (isAddedCompletely()) {
    		throw new IllegalStateException("This LargeElement has already been added to the Document.");
    	}
        Section section = new Section(title, numberDepth);
        section.setIndentation(indentation);
        add(section);
        return section;
    }
    
    /**
     * Creates a <CODE>Section</CODE>, adds it to this <CODE>Section</CODE> and returns it.
     *
     * @param	indentation	the indentation of the new section
     * @param	title		the title of the new section
     * @return  a new Section object
     */
    public Section addSection(float indentation, Paragraph title) {
        return addSection(indentation, title, numberDepth + 1);
    }
    
    /**
     * Creates a <CODE>Section</CODE>, add it to this <CODE>Section</CODE> and returns it.
     *
     * @param	title		the title of the new section
     * @param	numberDepth	the numberDepth of the section
     * @return  a new Section object
     */
    public Section addSection(Paragraph title, int numberDepth) {
        return addSection(0, title, numberDepth);
    }
    
    /**
     * Adds a marked section. For use in class MarkedSection only!
     */
    public MarkedSection addMarkedSection() {
    	MarkedSection section = new MarkedSection(new Section(null, numberDepth + 1));
    	add(section);
    	return section;
    }
    
    /**
     * Creates a <CODE>Section</CODE>, adds it to this <CODE>Section</CODE> and returns it.
     *
     * @param	title		the title of the new section
     * @return  a new Section object
     */
    public Section addSection(Paragraph title) {
        return addSection(0, title, numberDepth + 1);
    }
    
    /**
     * Adds a <CODE>Section</CODE> to this <CODE>Section</CODE> and returns it.
     *
     * @param	indentation	the indentation of the new section
     * @param	title		the title of the new section
     * @param	numberDepth	the numberDepth of the section
     * @return  a new Section object
     */
    public Section addSection(float indentation, String title, int numberDepth) {
        return addSection(indentation, new Paragraph(title), numberDepth);
    }
    
    /**
     * Adds a <CODE>Section</CODE> to this <CODE>Section</CODE> and returns it.
     *
     * @param	title		the title of the new section
     * @param	numberDepth	the numberDepth of the section
     * @return  a new Section object
     */
    public Section addSection(String title, int numberDepth) {
        return addSection(new Paragraph(title), numberDepth);
    }
    
    /**
     * Adds a <CODE>Section</CODE> to this <CODE>Section</CODE> and returns it.
     *
     * @param	indentation	the indentation of the new section
     * @param	title		the title of the new section
     * @return  a new Section object
     */
    public Section addSection(float indentation, String title) {
        return addSection(indentation, new Paragraph(title));
    }
    
    /**
     * Adds a <CODE>Section</CODE> to this <CODE>Section</CODE> and returns it.
     *
     * @param	title		the title of the new section
     * @return  a new Section object
     */
    public Section addSection(String title) {
        return addSection(new Paragraph(title));
    }
    
    // public methods
    
    /**
     * Sets the title of this section.
     *
     * @param	title	the new title
     */
    public void setTitle(Paragraph title) {
        this.title = title;
    }

	/**
     * Returns the title, preceded by a certain number of sectionnumbers.
     *
     * @return	a <CODE>Paragraph</CODE>
     */
    public Paragraph getTitle() {
        return constructTitle(title, numbers, numberDepth, numberStyle);
    }
    
    /**
     * Constructs a Paragraph that will be used as title for a Section or Chapter.
     * @param	title	the title of the section
     * @param	numbers	a list of sectionnumbers
     * @param	numberDepth	how many numbers have to be shown
     * @param	numberStyle	the numbering style
     * @return	a Paragraph object
	 * @since	iText 2.0.8
     */
    public static Paragraph constructTitle(Paragraph title, ArrayList numbers, int numberDepth, int numberStyle) {
    	if (title == null) {
    		return null;
    	}

        int depth = Math.min(numbers.size(), numberDepth);
        if (depth < 1) {
            return title;
        }
        StringBuffer buf = new StringBuffer(" ");
        for (int i = 0; i < depth; i++) {
            buf.insert(0, ".");
            buf.insert(0, ((Integer) numbers.get(i)).intValue());
        }
        if (numberStyle == NUMBERSTYLE_DOTTED_WITHOUT_FINAL_DOT) {
        	buf.deleteCharAt(buf.length() - 2);
        }
        Paragraph result = new Paragraph(title);
        result.add(0, new Chunk(buf.toString(), title.getFont()));
        return result;
    }
    
    /**
     * Sets the depth of the sectionnumbers that will be shown preceding the title.
     * <P>
     * If the numberdepth is 0, the sections will not be numbered. If the numberdepth
     * is 1, the section will be numbered with their own number. If the numberdepth is
     * higher (for instance x > 1), the numbers of x - 1 parents will be shown.
     *
     * @param	numberDepth		the new numberDepth
     */
    public void setNumberDepth(int numberDepth) {
        this.numberDepth = numberDepth;
    }
    
	/**
     * Returns the numberdepth of this <CODE>Section</CODE>.
     *
     * @return	the numberdepth
     */
    public int getNumberDepth() {
        return numberDepth;
    }

    /**
     * Sets the style for numbering sections.
     * Possible values are NUMBERSTYLE_DOTTED: 1.2.3. (the default)
     * or NUMBERSTYLE_DOTTED_WITHOUT_FINAL_DOT: 1.2.3
	 * @since	iText 2.0.8
     */
	public void setNumberStyle(int numberStyle) {
		this.numberStyle = numberStyle;
	}
	
	/**
	 * Gets the style used for numbering sections.
	 * @since	iText 2.0.8
	 * @return	a value corresponding with a numbering style
	 */
	public int getNumberStyle() {
		return numberStyle;
	}
    
    /**
     * Sets the indentation of this <CODE>Section</CODE> on the left side.
     *
     * @param	indentation		the indentation
     */
    public void setIndentationLeft(float indentation) {
        indentationLeft = indentation;
    }

	/**
     * Returns the indentation of this <CODE>Section</CODE> on the left side.
     *
     * @return	the indentation
     */
    public float getIndentationLeft() {
        return indentationLeft;
    }
    
    /**
     * Sets the indentation of this <CODE>Section</CODE> on the right side.
     *
     * @param	indentation		the indentation
     */
    public void setIndentationRight(float indentation) {
        indentationRight = indentation;
    }

	/**
     * Returns the indentation of this <CODE>Section</CODE> on the right side.
     *
     * @return	the indentation
     */
    public float getIndentationRight() {
        return indentationRight;
    }
    
    /**
     * Sets the indentation of the content of this <CODE>Section</CODE>.
     *
     * @param	indentation		the indentation
     */
    public void setIndentation(float indentation) {
        this.indentation = indentation;
    }

	/**
     * Returns the indentation of the content of this <CODE>Section</CODE>.
     *
     * @return	the indentation
     */
    public float getIndentation() {
        return indentation;
    }
    
    /** Setter for property bookmarkOpen.
     * @param bookmarkOpen false if the bookmark children are not
     * visible.
     */
    public void setBookmarkOpen(boolean bookmarkOpen) {
        this.bookmarkOpen = bookmarkOpen;
    }
    
    /**
     * Getter for property bookmarkOpen.
     * @return Value of property bookmarkOpen.
     */
    public boolean isBookmarkOpen() {
        return bookmarkOpen;
    }
    
    /**
     * Setter for property triggerNewPage.
     * @param triggerNewPage true if a new page has to be triggered.
     */
	public void setTriggerNewPage(boolean triggerNewPage) {
		this.triggerNewPage = triggerNewPage;
	}

    /**
     * Getter for property bookmarkOpen.
     * @return Value of property triggerNewPage.
     */
    public boolean isTriggerNewPage() {
		return triggerNewPage && notAddedYet;
	}
    
    /**
     * Sets the bookmark title. The bookmark title is the same as the section title but
     * can be changed with this method.
     * @param bookmarkTitle the bookmark title
     */    
    public void setBookmarkTitle(String bookmarkTitle) {
        this.bookmarkTitle = bookmarkTitle;
    }

	/**
     * Gets the bookmark title.
     * @return the bookmark title
     */    
    public Paragraph getBookmarkTitle() {
        if (bookmarkTitle == null)
            return getTitle();
        else
            return new Paragraph(bookmarkTitle);
    }
    
    /**
     * Changes the Chapter number.
     */
    public void setChapterNumber(int number) {
    	numbers.set(numbers.size() - 1, new Integer(number));
    	Object s;
    	for (Iterator i = iterator(); i.hasNext(); ) {
    		s = i.next();
    		if (s instanceof Section) {
    			((Section)s).setChapterNumber(number);
    		}
    	}
    }

	/**
     * Returns the depth of this section.
     *
     * @return	the depth
     */
    public int getDepth() {
        return numbers.size();
    }
    
    // private methods
    
    /**
     * Sets the number of this section.
     *
     * @param	number		the number of this section
     * @param	numbers		an <CODE>ArrayList</CODE>, containing the numbers of the Parent
     */
    private void setNumbers(int number, ArrayList numbers) {
        this.numbers = new ArrayList();
        this.numbers.add(new Integer(number));
        this.numbers.addAll(numbers);
    }

	/**
	 * Indicates if this is the first time the section is added.
	 * @since	iText2.0.8
	 * @return	true if the section wasn't added yet
	 */
	public boolean isNotAddedYet() {
		return notAddedYet;
	}

	/**
	 * Sets the indication if the section was already added to
	 * the document.
	 * @since	iText2.0.8
	 * @param notAddedYet
	 */
	public void setNotAddedYet(boolean notAddedYet) {
		this.notAddedYet = notAddedYet;
	}
    
    /**
     * @since	iText 2.0.8
     */
    protected boolean isAddedCompletely() {
		return addedCompletely;
	}
    
	/**
     * @since	iText 2.0.8
	 */
	protected void setAddedCompletely(boolean addedCompletely) {
		this.addedCompletely = addedCompletely;
	}
	
	/**
	 * @since	iText 2.0.8
	 * @see com.lowagie.text.LargeElement#flushContent()
	 */
	public void flushContent() {
		setNotAddedYet(false);
		title = null;
		Element element;
		for (Iterator i = iterator(); i.hasNext(); ) {
			element = (Element)i.next();
			if (element instanceof Section) {
				Section s = (Section)element;
				if (!s.isComplete() && size() == 1) {
					s.flushContent();
					return;
				}
				else {
					s.setAddedCompletely(true);
				}
			}
			i.remove();
		}
	}

	/**
     * @since	iText 2.0.8
	 * @see com.lowagie.text.LargeElement#isComplete()
	 */
	public boolean isComplete() {
		return complete;
	}

	/**
     * @since	iText 2.0.8
	 * @see com.lowagie.text.LargeElement#setComplete(boolean)
	 */
	public void setComplete(boolean complete) {
		this.complete = complete;
	}

	/**
	 * Adds a new page to the section.
	 * @since	2.1.1
	 */
	public void newPage() {
		this.add(Chunk.NEXTPAGE);
	}
}