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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2009-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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 */

package com.sun.grizzly.config;

import com.sun.grizzly.config.dom.NetworkListener;
import com.sun.hk2.component.Holder;
import com.sun.hk2.component.InhabitantsParser;
import com.sun.hk2.component.InhabitantsScanner;
import org.jvnet.hk2.component.Habitat;
import org.jvnet.hk2.config.ConfigParser;
import org.jvnet.hk2.config.DomDocument;

import javax.xml.stream.XMLInputFactory;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Enumeration;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * Created Dec 18, 2008
 *
 * @author Justin Lee
 */
public class Utils {
    private final static String habitatName = "default";
    private final static String inhabitantPath = "META-INF/inhabitants";

    public static Habitat getHabitat(final String fileURL) {
        URL url = Utils.class.getClassLoader().getResource(fileURL);
        if (url == null) {
            try {
                url = new URL(fileURL);
            } catch (MalformedURLException e) {
                throw new GrizzlyConfigException(e.getMessage());
            }
        }
        Habitat habitat = null;
        if (url != null) {
            try {
                habitat = getHabitat(url.openStream());
            } catch (IOException e) {
                e.printStackTrace();
                throw new RuntimeException(e.getMessage());
            }
        }
        return habitat;
    }

    public static Habitat getHabitat(final InputStream inputStream) {
        try {
            final Habitat habitat = getNewHabitat();
            final ConfigParser parser = new ConfigParser(habitat);
            XMLInputFactory xif = XMLInputFactory.class.getClassLoader() == null
                    ? XMLInputFactory.newInstance()
                    : XMLInputFactory.newInstance(XMLInputFactory.class.getName(),
                            XMLInputFactory.class.getClassLoader());
            final DomDocument document = parser.parse(xif.createXMLStreamReader(inputStream));

            habitat.addComponent("document", document);
            return habitat;
        } catch (Exception e) {
            e.printStackTrace();
            throw new GrizzlyConfigException(e.getMessage(), e);
        }
    }

    public static Habitat getNewHabitat() {
        final Holder holder = new Holder() {
            public ClassLoader get() {
                return getClass().getClassLoader();
            }
        };
        final Enumeration resources;
        try {
            resources = Utils.class.getClassLoader().getResources(inhabitantPath + "/" + habitatName);
        } catch (IOException e) {
            throw new GrizzlyConfigException(e);
        }
        if (resources == null) {
            System.out.println("Cannot find any inhabitant file in the classpath");
            return null;
        }
        final Habitat habitat = new Habitat();
        while (resources.hasMoreElements()) {
            final URL resource = resources.nextElement();
            final InhabitantsScanner scanner;
            try {
                scanner = new InhabitantsScanner(resource.openConnection().getInputStream(), habitatName);
            } catch (IOException e) {
                throw new GrizzlyConfigException(e);
            }
            final InhabitantsParser inhabitantsParser = new InhabitantsParser(habitat);
            try {
                inhabitantsParser.parse(scanner, holder);
            } catch (IOException e1) {
                e1.printStackTrace();
            }
        }
        return habitat;
    }

    public static String composeThreadPoolName(
            final NetworkListener networkListener) {
        return networkListener.getThreadPool() + "-" + networkListener.getPort();
    }

    /**
     * Load {@link AsyncFilter} with the specific service name and classname.
     * 
     * @param habitat
     * @param name
     * @param realClassName
     * @return
     */
    public static  E newInstance(Habitat habitat, Class clazz,
            final String name, final String realClassName) {
        boolean isInitialized = false;

        E instance = habitat.getComponent(clazz, name);
        if (instance == null) {
            try {
                instance = (E) newInstance(realClassName);
                isInitialized = true;
            } catch (Exception e) {
            }
        } else {
            isInitialized = true;
        }

        if (!isInitialized) {
            GrizzlyEmbeddedHttp.logger().log(Level.WARNING, "Instance could not be initialized. "
                    + "Class={0}, name={1}, realClassName={2}",
                    new Object[]{clazz, name, realClassName});
            return null;
        }

        return instance;
    }
    
    public static Object newInstance(String classname) throws Exception {
        return loadClass(classname).newInstance();
    }

    public static Class loadClass(String classname) throws ClassNotFoundException {
        Class clazz = null;
        ClassLoader cl = Thread.currentThread().getContextClassLoader();
        if (cl != null) {
            try {
                clazz = cl.loadClass(classname);
            } catch (Exception cnfe) {
            }
        }
        return clazz == null ? GrizzlyEmbeddedHttp.class.getClassLoader().loadClass(classname) : clazz;
    }

}