/*

 * Created on Jun 24, 2003

 *  

 */

package isac.util.genhtml;

import isac.util.InformationProcessor;

import java.io.FileWriter;

import java.io.IOException;

import java.io.InputStream;

import java.io.StringReader;

import java.util.HashSet;

import java.util.Iterator;

import java.util.Set;

import java.util.StringTokenizer;

import java.util.Vector;

import javax.xml.parsers.DocumentBuilder;

import javax.xml.parsers.DocumentBuilderFactory;

import javax.xml.parsers.ParserConfigurationException;

import javax.xml.transform.Source;

import javax.xml.transform.stream.StreamSource;

import org.w3c.dom.Document;

import org.w3c.dom.Element;

import org.w3c.dom.NodeList;

import org.xml.sax.InputSource;

import org.xml.sax.SAXException;

/**

 * @author Andreas Griesmayer

 *  

 */

public class GenHTML {

    static final int PBLTREE_XSL = 1;

    static final int METTREE_XSL = 2;

    static final int EXPTREE_XSL = 3;

    static final int SIMPLE_HIERARCHY_XSL = 4;

    static final int SIMPLE_PBL_NODE = 5;

    static String destination_ = "/home/neuper/proto2/www/kbase/";

   public static void main(String[] argv) {

        if (argv.length > 0) destination_ = argv[0];

        GenHTML genhtml = new GenHTML();

        genhtml.buildHierarchy("met/code.html");

        genhtml.buildHierarchy("met/index.html");

        genhtml.buildHierarchy("met/heading.html");

        genhtml.buildHierarchy("met/menu_empty.html");

        genhtml.buildHierarchy("met/main.html");

        genhtml.buildHierarchy("pbl/code.html");

        genhtml.buildHierarchy("pbl/index.html");

        genhtml.buildHierarchy("pbl/heading.html");

        genhtml.buildHierarchy("pbl/menu_empty.html");

        genhtml.buildHierarchy("pbl/main.html");

        genhtml.buildHierarchy("exp/code.html");

        genhtml.buildHierarchy("exp/index.html");

        genhtml.buildHierarchy("exp/heading.html");

        genhtml.buildHierarchy("exp/menu_empty.html");

        genhtml.buildHierarchy("exp/main.html");

        Set exp_set = genhtml.loadFileList("exp");

        Iterator exp_it = exp_set.iterator();

        int index = exp_set.size();

        while (exp_it.hasNext()) {

            System.out.println("exp to generate:" + (index--));

            genhtml.loadContent("exp/" + exp_it.next());

        }

        Set pbl_set = genhtml.loadFileList("pbl");

        index = pbl_set.size();

        Iterator pbl_it = pbl_set.iterator();

        while (pbl_it.hasNext()) {

            System.out.println("pbl to generate:" + (index--));

            genhtml.loadContent("pbl/" + pbl_it.next());

        }

        Set met_set = genhtml.loadFileList("met");

        index = met_set.size();

        Iterator met_it = met_set.iterator();

        while (met_it.hasNext()) {

            System.out.println("met to generate:" + (index--));

            genhtml.loadContent("met/" + met_it.next());

        }

    }

    Set loadFileList(String type) {

        Set return_set = new HashSet();

        try {

            DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();

            DocumentBuilder db = dbf.newDocumentBuilder();

            String h_xml = InformationProcessor.loadHierarchy("", type);

            InputSource inputsource = new InputSource(new StringReader(h_xml));

            Document document = db.parse(inputsource);

            Element doc_elem = document.getDocumentElement();

            NodeList nodelist = doc_elem.getElementsByTagName("CONTENTREF");

            for (int index = 0; index < nodelist.getLength(); index++) {

                return_set.add(nodelist.item(index).getFirstChild()

                        .getNodeValue().trim());

            }

            nodelist = doc_elem.getElementsByTagName("EXAMPLE");

            for (int index = 0; index < nodelist.getLength(); index++) {

                return_set.add(nodelist.item(index).getFirstChild()

                        .getNodeValue().trim());

            }

        } catch (ParserConfigurationException e) {

            e.printStackTrace();

        } catch (SAXException e) {

            e.printStackTrace();

        } catch (IOException e) {

            e.printStackTrace();

        }

        return return_set;

    }

    /**

     * Loads all hierarchies which are displayed on the web-browser

     */

    protected void buildHierarchy(String path) {

        String session = "";

        StringTokenizer tokens = new StringTokenizer(path, "/");

        //	(String)request.getSession().getAttribute("session_id");

        //	if(session==null)

        //	    session="";

        path = "";

        String type = tokens.nextToken();

        if (!tokens.hasMoreTokens())

            path = "/index.html";

        else

            while (tokens.hasMoreTokens())

                path += "/" + tokens.nextToken();

        try {

            if (path.endsWith("code.html")) {

                Vector parameter = new Vector();

                parameter.add(session);

                parameter.add(type);

                Vector result;

                Source xslSource = null;

                Source xmlSource = new StreamSource(new StringReader(

                        InformationProcessor.loadHierarchy(session, type)));

                if (type.equals("pbl"))

                    xslSource = new StreamSource(

                            getClass()

                                    .getResourceAsStream(

                                            "/isac/util/genhtml/templates/pbl_hierarchy_jmenu.xsl"));

                else if (type.equals("met"))

                    xslSource = new StreamSource(

                            getClass()

                                    .getResourceAsStream(

                                            "/isac/util/genhtml/templates/met_hierarchy_jmenu.xsl"));

                else

                    xslSource = new StreamSource(

                            getClass()

                                    .getResourceAsStream(

                                            "/isac/util/genhtml/templates/exp_hierarchy_jmenu.xsl"));

                String header = toString(getClass().getResourceAsStream(

                        "/isac/util/genhtml/templates/codeheader.html"));

                String footer = toString(getClass().getResourceAsStream(

                        "/isac/util/genhtml/templates/codefooter.html"));

                // Perform the transformation, sending the output to the

                // response.

                //java.io.PrintWriter out = response.getWriter();

                FileWriter out = new FileWriter(destination_ + type + "/"

                        + path);

                out.write(header);

                Encoder.encodeInformation(xslSource, xmlSource, out);

                out.write(footer);

                out.close();

            } else {

                if (path.trim().endsWith("index.html")) {

                    if (type.equals("pbl")) {

                        path = "index_pbl.html";

                    } else if (type.equals("met"))

                        path = "index_met.html";

                    else

                        path = "index_exp.html";

                }

                System.out.println(path);

                InputStream istream = getClass().getResourceAsStream(

                        "/isac/util/genhtml/jscript/" + path);

                FileWriter out = new FileWriter(destination_ + type + "/"

                        + path);

                int input;

                while ((input = istream.read()) != -1) {

                    out.write(input);

                }

                out.close();

            }

        } catch (IOException exc) {

            System.out.println("IOException:" + exc.getMessage());

        }

    }

    private String toString(InputStream istream) {

        StringBuffer buf = new StringBuffer(10000);

        int input;

        try {

            while ((input = istream.read()) != -1) {

                buf.append((char) input);

            }

        } catch (IOException e) {

            return getErrorXML("Sorry, IOException while accessing the InputStream "

                    + e.getMessage());

        }

        return buf.toString();

    }

    private static String getErrorXML(String string) {

        return "<ERROR><DESCRIPTION> <h1> Error in file LoadHierarchy.java </h1>"

                + string + "</DESCRIPTION></ERROR>";

    }

    protected void loadFile(String path) {

        StringTokenizer tokens = new StringTokenizer(path, "/");

        //		(String)request.getSession().getAttribute("session_id");

        //		if(session==null)

        //			session="";

        String session_id = "";

        path = "";

        String type = (String) tokens.nextToken();

        if (!tokens.hasMoreTokens())

            path = "/index.html";

        else

            while (tokens.hasMoreTokens())

                path += "/" + tokens.nextToken();

        try {

            if (path.endsWith("code.html")) {

                Vector parameter = new Vector();

                parameter.add(session_id);

                parameter.add(type);

                Vector result;

                Source xmlSource = new StreamSource(new StringReader(

                        InformationProcessor.loadHierarchy(session_id, type)));

                // Perform the transformation, sending the output to the

                // response.

                java.io.FileWriter out = new FileWriter(destination_ + type

                        + "/" + path);

                Encoder.encodeHierarchy(type, xmlSource, out);

                return;

            } else if (path.trim().endsWith("heading.html")) {

                java.io.FileWriter out = new FileWriter(destination_ + type

                        + "/" + path);

                out.write(getHeader(session_id));

                return;

            } else if (path.trim().endsWith("treecontent.html")) {

                Vector parameter = new Vector();

                parameter.add(session_id);

                parameter.add(type);

                Vector result;

                Source xmlSource = new StreamSource(new StringReader(

                        InformationProcessor.loadHierarchy(session_id, type)));

                // Perform the transformation, sending the output to the

                // response.

                java.io.FileWriter out = new FileWriter(destination_ + type

                        + "/" + path);

                Encoder.encodeHContent(type, xmlSource, out);

                return;

            }

            //TODO this type should not result in different files but in an

            // autogeneration of a fitting file

            if (path.trim().endsWith("index.html")) {

                if (type.equals("pbl")) {

                    path = "index_pbl.html";

                } else if (type.equals("met"))

                    path = "index_met.html";

                else

                    path = "index_exp.html";

            }

            InputStream istream = getClass().getResourceAsStream(

                    "/isac/BrowserServlet/jscript/" + path);

            java.io.FileWriter out = new FileWriter(destination_ + type + "/"

                    + path);

            int input;

            while ((input = istream.read()) != -1) {

                out.write(input);

            }

        } catch (IOException exc) {

            System.out.println("bla");

        }

    }

    private String getHeader(String session_id) {

        String headercontent = "<html>"

                + "<body>"

                + "<a href=\"../../isac.BrowserServlet.Login\" target=\"text\">"

                + " login </a>"

                + "  "

                + "<a href=\"../../isac.BrowserServlet.Logout\" target=\"text\">"

                + " logout </a>"

                + "<br> <a href=\"../../isac.BrowserServlet.LoadFile/pbl/index.html\" target=\"_top\">PBLHierarchy</a>"

                + "&nbsp;&nbsp;<a href=\"../../isac.BrowserServlet.LoadFile/met/index.html\" target=\"_top\">METHierarchy</a>"

                + "&nbsp;&nbsp;<a href=\"../../isac.BrowserServlet.LoadFile/exp/index.html\" target=\"_top\">ExampleHierarchy</a>"

                + "  ";

        String username;

        if ((username = InformationProcessor.getUsername(session_id)) == null)

            headercontent += "not logged in";

        else

            headercontent += " welcome <b>" + username + "</b>";

        headercontent += "</body> </html>";

        return headercontent;

    }

    protected void loadContent(String path) {

        StringTokenizer tokens = new StringTokenizer(path, "/");

        String session = "";

        Vector parameter = new Vector();

        parameter.add(session);

        try {

            Source xslSource = null;

            Source xmlSource = null;

            String command = tokens.nextToken();

            String header = "<?xml version=\"1.0\"?> \n"

                    + "<?xml-stylesheet href=\"http://pear.math.pitt.edu/mathzilla/Examples/mml.css\" type=\"text/css\"?>\n"

                    + "<!DOCTYPE html SYSTEM \"mathml.dtd_\">\n" +

                    //"<?xml-stylesheet type=\"text/xsl\"

                    // href=\"http://www.w3.org/Math/XSL/pmathml.xsl\"?>\n"+

                    //" <HTML xmlns=\"http://www.w3.org/1999/xhtml\">\n"+

                    "<HTML xmlns=\"http://www.w3.org/1999/xhtml\"\n"

                    + "xmlns:math=\"http://www.w3.org/1998/Math/MathML\"\n"

                    + "xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n"

                    + "<BODY>";

            String footer = "</BODY>\n</HTML>";

            //		if(command.equals("pbl-node")){

            FileWriter out;

            parameter.add(command);

            if (!tokens.hasMoreElements()) {

                out = new FileWriter(destination_ + path + ".html");

                out.write(header);

                out.write("no details");

                out.write(footer);

                return;

            }

            String contentfile = tokens.nextToken();

            parameter.add(contentfile);

            if (!contentfile.trim().endsWith(".xml")) { return; }

            out = new FileWriter(destination_ + path + ".html");

            xmlSource = new StreamSource(new StringReader(InformationProcessor

                    .loadXML(session, command, contentfile)));

            xslSource = new StreamSource(getClass().getResourceAsStream(

                    "/isac/util/genhtml/templates/pbl_node_content.xsl"));

            //		}

            // Perform the transformation, sending the output to the response.

            out.write(header);

            Encoder.encodeInformation(xslSource, xmlSource, out);

            out.write(footer);

        } catch (IOException exc) {

            exc.printStackTrace();

        }

        //	arg1.getWriter().print("pathinfo: "+arg0.getPathInfo()+"\n

        // transl:"+arg0.getPathTranslated());

    }

}