/*
 * This program 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.
 * 
 * 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 General Public License for more
 * details.
 * 
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <http://www.gnu.org/licenses/>.
 */
package net.sf.l2j.gameserver.script.faenor;

import java.io.File;
import java.io.FileFilter;
import java.io.IOException;
import java.util.LinkedList;
import java.util.List;
import java.util.logging.Logger;
import java.util.zip.ZipException;
import java.util.zip.ZipFile;

import javax.script.ScriptContext;
import javax.script.ScriptException;

import net.sf.l2j.Config;
import net.sf.l2j.gameserver.script.Parser;
import net.sf.l2j.gameserver.script.ParserNotCreatedException;
import net.sf.l2j.gameserver.script.ScriptDocument;
import net.sf.l2j.gameserver.script.ScriptEngine;
import net.sf.l2j.gameserver.script.ScriptPackage;
import net.sf.l2j.gameserver.scripting.L2ScriptEngineManager;

import org.w3c.dom.Node;

/**
 * @author Luis Arias
 *
 */
public class FaenorScriptEngine extends ScriptEngine
{
    static Logger _log = Logger.getLogger(FaenorScriptEngine.class.getName());
    public final static String PACKAGE_DIRECTORY = "data/faenor/";
    public final static boolean DEBUG = true;

    private static FaenorScriptEngine _instance;

    private LinkedList<ScriptDocument> _scripts;

    public static FaenorScriptEngine getInstance()
    {
        if (_instance == null)
        {
            _instance = new FaenorScriptEngine();
        }

        return _instance;
    }

    private FaenorScriptEngine()
    {
        _scripts = new LinkedList<ScriptDocument>();
        loadPackages();
        parsePackages();

    }

    public void reloadPackages()
    {
        _scripts = new LinkedList<ScriptDocument>();
        parsePackages();
    }

    private void loadPackages()
    {
        File packDirectory = new File(Config.DATAPACK_ROOT, PACKAGE_DIRECTORY);//_log.sss(packDirectory.getAbsolutePath());

        FileFilter fileFilter = new FileFilter() {
            public boolean accept(File file)
            {
                return file.getName().endsWith(".zip");
            }
        };

        File[] files = packDirectory.listFiles(fileFilter);
        if (files == null) return;
        ZipFile zipPack;

        for (int i = 0; i < files.length; i++)
        {
            try
            {
                zipPack = new ZipFile(files[i]);
            }
            catch (ZipException e)
            {
                e.printStackTrace();
                continue;
            }
            catch (IOException e)
            {
                e.printStackTrace();
                continue;
            }

            ScriptPackage module = new ScriptPackage(zipPack);

            List<ScriptDocument> scrpts = module.getScriptFiles();
            for (ScriptDocument script : scrpts)
            {
                _scripts.add(script);
            }

        }
        /*for (ScriptDocument script : scripts)
         {
         _log.sss("Script: "+script);
         }
         _log.sss("Sorting");
         orderScripts();
         for (ScriptDocument script : scripts)
         {
         _log.sss("Script: "+script);
         }*/
    }

    public void orderScripts()
    {
        if (_scripts.size() > 1)
        {
            //ScriptDocument npcInfo = null;

            for (int i = 0; i < _scripts.size();)
            {
                if (_scripts.get(i).getName().contains("NpcStatData"))
                {
                    _scripts.addFirst(_scripts.remove(i));
                    //scripts.set(i, scripts.get(0));
                    //scripts.set(0, npcInfo);
                }
                else
                {
                    i++;
                }
            }
        }
    }

    public void parsePackages()
    {
        L2ScriptEngineManager sem = L2ScriptEngineManager.getInstance();
        ScriptContext context = sem.getScriptContext("beanshell");
        try
        {
            sem.eval("beanshell", "double log1p(double d) { return Math.log1p(d); }");
            sem.eval("beanshell", "double pow(double d, double p) { return Math.pow(d,p); }");

            for (ScriptDocument script : _scripts)
            {
                parseScript(script, context);
            }
        }
        catch (ScriptException e)
        {
            e.printStackTrace();
        }
    }

    public void parseScript(ScriptDocument script, ScriptContext context)
    {
        if (DEBUG) 
        {
            _log.fine("Parsing Script: " + script.getName());
        }

        Node node = script.getDocument().getFirstChild();
        String parserClass = "faenor.Faenor" + node.getNodeName() + "Parser";

        Parser parser = null;
        try
        {
            parser = createParser(parserClass);
        }
        catch (ParserNotCreatedException e)
        {
            _log.warning("ERROR: No parser registered for Script: " + parserClass);
            e.printStackTrace();
        }

        if (parser == null)
        {
            _log.warning("Unknown Script Type: " + script.getName());
            return;
        }

        try
        {
            parser.parseScript(node, context);
            _log.fine(script.getName() + "Script Sucessfullty Parsed.");
        }
        catch (Exception e)
        {
            e.printStackTrace();
            _log.warning("Script Parsing Failed.");
        }
    }

    @Override
	public String toString()
    {
        if (_scripts.isEmpty()) return "No Packages Loaded.";

        String out = "Script Packages currently loaded:\n";

        for (ScriptDocument script : _scripts)
        {
            out += script;
        }
        return out;
    }
}
