package org.exist.xquery.modules.xslfo;

import java.io.OutputStream;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.util.Properties;
import javax.xml.transform.Source;
import javax.xml.transform.dom.DOMSource;
import org.exist.storage.DBBroker;
import org.exist.xquery.XPathException;
import org.exist.xquery.value.NodeValue;
import org.w3c.dom.Node;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;

/**
 *
 * @author Adam Retter <adam@exist-db.org>
 */
public class RenderXXepProcessorAdapter implements ProcessorAdapter {

    private Object formatter = null;


    @Override
    public ContentHandler getContentHandler(DBBroker broker, NodeValue configFile, Properties parameters, String mimeType, OutputStream os) throws XPathException, SAXException {

        if(configFile == null) {
            throw new XPathException("XEP requires a configuration file");
        }

        try {

            Class formatterImplClazz = Class.forName("com.renderx.xep.FormatterImpl");

            if(parameters == null) {
                Constructor formatterImplCstr = formatterImplClazz.getConstructor(Source.class);
                formatter = formatterImplCstr.newInstance(new DOMSource((Node)configFile));
            } else {
                Constructor formatterImplCstr = formatterImplClazz.getConstructor(Source.class, Properties.class);
                formatter = formatterImplCstr.newInstance(new DOMSource((Node)configFile), parameters);
            }
            String backendType = mimeType.substring(mimeType.indexOf("/")+1).toUpperCase();

            Class foTargetClazz = Class.forName("com.renderx.xep.FOTarget");
            Constructor foTargetCstr = foTargetClazz.getConstructor(OutputStream.class, String.class);
            Object foTarget = foTargetCstr.newInstance(os, backendType);

            Method createContentHandlerMethod = formatterImplClazz.getMethod("createContentHandler", String.class, foTargetClazz);

            return (ContentHandler) createContentHandlerMethod.invoke(formatter, null, foTarget);
        } catch (Exception e) {
            throw new SAXException(e.getMessage(), e);
        }
    }

    @Override
    public void cleanup() {
        if(formatter != null) {
            try{
                Class formatterImplClazz = Class.forName("com.renderx.xep.FormatterImpl");
                Method cleanupMethod = formatterImplClazz.getMethod("cleanup");
                cleanupMethod.invoke(formatter);
            } catch(Exception e) {
                // do nothing
            }
        }
     }
}