/************************************************************************
 *
 *  SectionConverter.java
 *
 *  Copyright: 2002-2014 by Henrik Just
 *
 *  This file is part of Writer2LaTeX.
 *  
 *  Writer2LaTeX is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *  
 *  Writer2LaTeX 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 General Public License for more details.
 *  
 *  You should have received a copy of the GNU General Public License
 *  along with Writer2LaTeX.  If not, see <http://www.gnu.org/licenses/>.
 * 
 *  Version 1.4 (2014-09-08)
 *
 */

package writer2latex.latex;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.w3c.dom.Element;
import org.w3c.dom.Node;

import writer2latex.util.*;
import writer2latex.office.*;
import writer2latex.latex.i18n.ClassicI18n;
import writer2latex.latex.util.BeforeAfter;
import writer2latex.latex.util.Context;

/** <p>This class creates LaTeX code from OOo sections.
 *  <p>Sections are converted to multicols environments using <code>multicol.sty</code>
 */
public class SectionConverter extends ConverterHelper {

    // Do we need multicols.sty?
    private boolean bNeedMulticol = false;
    
    // Display hidden text?
    private boolean bDisplayHiddenText = false;
	
    // Filenames for external sections
    private ExportNameCollection fileNames = new ExportNameCollection(true);
    
    /** <p>Constructs a new <code>SectionStyleConverter</code>.</p>
     */
    public SectionConverter(OfficeReader ofr, LaTeXConfig config, ConverterPalette palette) {
        super(ofr,config,palette);
        this.bDisplayHiddenText = config.displayHiddenText();
    }
	
    public void appendDeclarations(LaTeXDocumentPortion pack, LaTeXDocumentPortion decl) {
        if (bNeedMulticol) { pack.append("\\usepackage{multicol}").nl(); }
    }
    
    // Handle a section as a Zotero bibliography
    private boolean handleZoteroBibliography(Element node, LaTeXDocumentPortion ldp, Context oc) {
    	String sName = node.getAttribute(XMLString.TEXT_NAME);
    	if (config.useBibtex() && config.zoteroBibtexFiles().length()>0	&& sName.startsWith("ZOTERO_BIBL")) {
    		// This section is a Zotero bibliography, and the user wishes to handle it as such
        	// A Zotero bibliography name has the form ZOTERO_BIBL <json object> <identifier> with a single space separating the items
        	// The identifier is a unique identifier for the bibliography and is not used here
    		if (!config.noIndex()) {
    			// Parse the name (errors are ignored) and add \nocite commands as appropriate
        		int nObjectStart = sName.indexOf('{');
        		int nObjectEnd = sName.lastIndexOf('}');
        		if (nObjectStart>-1 && nObjectEnd>-1 && nObjectStart<nObjectEnd) {
        			String sJsonObject = sName.substring(nObjectStart, nObjectEnd+1);
        			JSONObject jo = null;
        			try {
        				jo = new JSONObject(sJsonObject);
        			} catch (JSONException e) {
        			}
        			if (jo!=null) {
        				JSONArray uncited = null;
        				try {
        					uncited = jo.getJSONArray("uncited");
        				}
        				catch (JSONException e) {
        				}
        				if (uncited!=null) {
        					int nCount = uncited.length();
        					if (nCount>0) {
        						ldp.append("\\nocite{");
        						for (int nIndex=0; nIndex<nCount; nIndex++) {
        							if (nIndex>0) {
        								ldp.append(",");
        							}
        							String sURI = null;
        							try { // Each item is an array containing a single string
        								sURI = uncited.getJSONArray(nIndex).getString(0);
        							}
        							catch (JSONException e) {
        							}
        							if (sURI!=null) {
        								int nSlash = sURI.lastIndexOf('/');
        								if (nSlash>0) { ldp.append(sURI.substring(nSlash+1)); }
        								else { ldp.append(sURI); }
        							}
        						}
        						ldp.append("}").nl();
        					}
        				}
        			}
        		}

    			// Use the BibTeX style and files given in the configuration
    			ldp.append("\\bibliographystyle{").append(config.bibtexStyle()).append("}").nl()
    			.append("\\bibliography{").append(config.zoteroBibtexFiles()).append("}").nl();
    		}
    		return true;
    	}
    	else {
    		return false;
    	}
    }
    
    // Handle a section as a JabRef bibliography
    private boolean handleJabRefBibliography(Element node, LaTeXDocumentPortion ldp, Context oc) {
    	String sName = node.getAttribute(XMLString.TEXT_NAME);
    	if (config.useBibtex() && config.jabrefBibtexFiles().length()>0	&& sName.equals("JR_bib")) {
    		// This section is a JabRef bibliography, and the user wishes to handle it as such
        	// A JabRef bibliography is identified by the name JR_bib
			// Use the BibTeX style and files given in the configuration
			ldp.append("\\bibliographystyle{").append(config.bibtexStyle()).append("}").nl()
			   .append("\\bibliography{").append(config.jabrefBibtexFiles()).append("}").nl();
			return true;
    	}
    	return false;
    }
	
    /** <p> Process a section (text:section tag)</p>
     * @param node The element containing the section
     * @param ldp the <code>LaTeXDocumentPortion</code> to which
     * LaTeX code should be added
     * @param oc the current context
     */
    public void handleSection(Element node, LaTeXDocumentPortion ldp, Context oc) {
    	// Unlike headings, paragraphs and spans, text:display is not attached to the style:
        if (!bDisplayHiddenText && "none".equals(Misc.getAttribute(node,XMLString.TEXT_DISPLAY))) {
        	return;
        }

        // We may need a hyperlink target, add this first
        palette.getFieldCv().addTarget(node,"|region",ldp);

        // Create new document, if desired
        String sFileName = null;
        Element source = Misc.getChildByTagName(node,XMLString.TEXT_SECTION_SOURCE);
        if (config.splitLinkedSections() && source!=null) {
            sFileName = fileNames.getExportName(Misc.removeExtension(Misc.urlDecode(source.getAttribute(XMLString.XLINK_HREF))));
        }
        else if (config.splitToplevelSections() && isToplevel(node)) {
            //sFileName = fileNames.getExportName(palette.getOutFileName()+node.getAttribute(XMLString.TEXT_NAME));
            sFileName = fileNames.getExportName(node.getAttribute(XMLString.TEXT_NAME));
        }

        LaTeXDocumentPortion sectionLdp = ldp;
        if (sFileName!=null) {
            LaTeXDocument newDoc = new LaTeXDocument(sFileName,config.getWrapLinesAfter(),false);
            if (config.getBackend()!=LaTeXConfig.XETEX) {
                newDoc.setEncoding(ClassicI18n.writeJavaEncoding(config.getInputencoding()));            	
            }
            else {
                newDoc.setEncoding("UTF-8");            	            	
            }
            palette.addDocument(newDoc);
            sectionLdp = newDoc.getContents();
        }

        // Apply the style
        String sStyleName = node.getAttribute(XMLString.TEXT_STYLE_NAME);
        BeforeAfter ba = new BeforeAfter();
        Context ic = (Context) oc.clone();
        applySectionStyle(sStyleName,ba,ic);
		
        // Do conversion
        ldp.append(ba.getBefore());
        if (sFileName!=null) {
            ldp.append("\\input{").append(sFileName).append("}").nl();
        }
        // Zotero or JabRef might have generated this section as a bibliograhy:
        if (!handleZoteroBibliography(node,sectionLdp,ic) && !handleJabRefBibliography(node,sectionLdp,ic)) {
        	palette.getBlockCv().traverseBlockText(node,sectionLdp,ic);
        }
        if (sectionLdp!=ldp) { sectionLdp.append("\\endinput").nl(); }
        ldp.append(ba.getAfter());
    }

    // Create multicols environment as needed
    private void applySectionStyle(String sStyleName, BeforeAfter ba, Context context) {
        StyleWithProperties style = ofr.getSectionStyle(sStyleName);
        // Don't nest multicols and require at least 2 columns
        if (context.isInMulticols() || style==null || style.getColCount()<2) { return; }
        int nCols = style.getColCount(); 
        bNeedMulticol = true;
        context.setInMulticols(true);
        ba.add("\\begin{multicols}{"+(nCols>10 ? 10 : nCols)+"}\n", "\\end{multicols}\n");
    }
	
    // return true if this node is *not* contained in a text:section element
    private boolean isToplevel(Node node) {
        Node parent = node.getParentNode();
        if (XMLString.TEXT_SECTION.equals(parent.getNodeName())) {
            return false;
        }
        else if (XMLString.OFFICE_BODY.equals(parent.getNodeName())) {
            return true;
        }
        return isToplevel(parent);
    }


    
}