/*
 *                 Sun Public License Notice
 * 
 * The contents of this file are subject to the Sun Public License
 * Version 1.0 (the "License"). You may not use this file except in
 * compliance with the License. A copy of the License is available at
 * http://www.sun.com/
 * 
 * The Original Code is NetBeans. The Initial Developer of the Original
 * Code is Sun Microsystems, Inc. Portions Copyright 1997-2003 Sun
 * Microsystems, Inc. All Rights Reserved.
 */

package org.netbeans.modules.httpserver;

import java.io.File;
import java.net.URL;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.net.URLEncoder;
import java.net.URLDecoder;
import java.net.MalformedURLException;
import java.util.StringTokenizer;

import org.openide.ErrorManager;
import org.openide.util.SharedClassObject;
import org.openide.filesystems.URLMapper;
import org.openide.filesystems.FileUtil;
import org.openide.filesystems.FileObject;

/** Implementation of a URLMapper which creates http URLs for fileobjects in the IDE.
 * Directs the requests for URLs to WrapperServlet.
 *
 * @author Petr Jiricka, David Konecny
 */
public class HttpServerURLMapper extends URLMapper {
    
    /** Creates a new instance of HttpServerURLMapper */
    public HttpServerURLMapper() {
    }
    
    /** Get an array of FileObjects for this url
     * @param url to wanted FileObjects
     * @return a suitable arry of FileObjects, or null
     */
    public FileObject[] getFileObjects(URL url) {
        String path = url.getPath();

        // remove the wrapper servlet URI
        HttpServerSettings settings = (HttpServerSettings)SharedClassObject.findObject(HttpServerSettings.class, true);
        String wrapper = settings.getWrapperBaseURL ();
        if (path == null || !path.startsWith(wrapper))
            return null;
        path = path.substring(wrapper.length());
        
        // resource name
        if (path.startsWith ("/")) path = path.substring (1); // NOI18N
        if (path.length() == 0) {
            return new FileObject[0];
        }
        // decode path to EXTERNAL/INTERNAL type of URL
        URL u = decodeURL(path);
        if (u == null) {
            return new FileObject[0];
        }
        return URLMapper.findFileObjects(u);
    }
    
    private URL decodeURL(String path) {
        StringTokenizer slashTok = new StringTokenizer(path, "/", true); // NOI18N
        StringBuffer newPath = new StringBuffer();
        while (slashTok.hasMoreTokens()) {
            String tok = slashTok.nextToken();
            if (tok.startsWith("/")) { // NOI18N
                newPath.append(tok);
            } else {
                newPath.append(URLDecoder.decode(tok));
            }
        }
        
        try {
            return new URL(newPath.toString());
        } catch (MalformedURLException ex) {
            ErrorManager.getDefault().notify(ErrorManager.INFORMATIONAL, ex);
            return null;
        }
    }
    
    /** Get a good URL for this file object which works according to type:
     * -inside this VM
     * - inside this machine
     * - from networked machines 
     * @return a suitable URL, or null
     */            
    public URL getURL(FileObject fileObject, int type) {
        
        // only do external and network URLs
        if (type != URLMapper.NETWORK)
            return null;
        
        // fileObject must not be null
        if (fileObject == null)
            return null;
        
        // if the file is on the localhost, don't return URL with HTTP
        if (FileUtil.toFile(fileObject) != null)
            return null;

        // It should be OK to call URLMapper here because we call
        // it with different then NETWORK type.
        URL u = URLMapper.findURL(fileObject, URLMapper.EXTERNAL);
        if (u == null) {
            // if EXTERNAL type is not available try the INTERNAL one
            u = URLMapper.findURL(fileObject, URLMapper.INTERNAL);
            if (u == null) {
                return null;
            }
        }
        String path = encodeURL(u);
        HttpServerSettings settings = (HttpServerSettings)SharedClassObject.findObject(HttpServerSettings.class, true);
        settings.setRunning(true);
        try {
            URL newURL = new URL("http",   // NOI18N
                getLocalHost(),
                settings.getPort(),
                settings.getWrapperBaseURL() + path); // NOI18N
            return newURL;
        } catch (MalformedURLException e) {
            ErrorManager.getDefault().notify(ErrorManager.WARNING, e);
            return null;
        }
    }
    
    private String encodeURL(URL u) {
        String orig = u.toExternalForm();
        StringTokenizer slashTok = new StringTokenizer(orig, "/", true); // NOI18N
        StringBuffer path = new StringBuffer();
        while (slashTok.hasMoreTokens()) {
            String tok = slashTok.nextToken();
            if (tok.startsWith("/")) { // NOI18N
                path.append(tok);
            } else {
                path.append(URLEncoder.encode(tok));
            }
        }
        return path.toString();
    }
    
    /** Returns string for localhost */
    private static String getLocalHost() {
        try {
            return InetAddress.getLocalHost().getHostName();
        } catch (UnknownHostException e) {
            return "localhost"; // NOI18N
        }
    }

    
}