/*
 *                 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 1997-2004 Sun
 * Microsystems, Inc. All Rights Reserved.
 */

package org.netbeans.modules.ant.freeform.ui;

import java.awt.Component;
import java.io.BufferedReader;
import java.io.File;
import java.io.InputStreamReader;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import org.netbeans.modules.ant.freeform.FreeformProjectGenerator;
import org.openide.ErrorManager;
import org.openide.WizardDescriptor;
import org.openide.filesystems.FileObject;
import org.openide.filesystems.FileStateInvalidException;
import org.openide.filesystems.FileUtil;
import org.openide.util.HelpCtx;

/**
 * @author  Radko Najman
 */
public class WebLocationsWizardPanel implements WizardDescriptor.Panel {

    private WebLocationsPanel component;
    private WizardDescriptor wizardDescriptor;
    private File baseFolder;

    public WebLocationsWizardPanel() {
    }

    public Component getComponent() {
        if (component == null) {
            component = new WebLocationsPanel();
        }
        return component;
    }

    public HelpCtx getHelp() {
        return new HelpCtx( WebLocationsWizardPanel.class );
    }

    public boolean isValid() {
        getComponent();
        return true;
    }

    private final Set/**/ listeners = new HashSet(1);
    public final void addChangeListener(ChangeListener l) {
        synchronized (listeners) {
            listeners.add(l);
        }
    }
    public final void removeChangeListener(ChangeListener l) {
        synchronized (listeners) {
            listeners.remove(l);
        }
    }
    protected final void fireChangeEvent() {
        Iterator it;
        synchronized (listeners) {
            it = new HashSet(listeners).iterator();
        }
        ChangeEvent ev = new ChangeEvent(this);
        while (it.hasNext()) {
            ((ChangeListener)it.next()).stateChanged(ev);
        }
    }

    public void readSettings(Object settings) {
        wizardDescriptor = (WizardDescriptor) settings;
        wizardDescriptor.putProperty("NewProjectWizard_Title", component.getClientProperty("NewProjectWizard_Title")); // NOI18N

        //guess webapps well-known locations and preset them
        ProjectModel pm = (ProjectModel)wizardDescriptor.getProperty(NewJ2SEFreeformProjectWizardIterator.PROP_PROJECT_MODEL);
        File baseFolder = pm.getBaseFolder();
        File nbProjectFolder = pm.getNBProjectFolder();
        final String webPages;
        final String srcPackages;
        if(baseFolder.equals(this.baseFolder)) {
            webPages = component.getWebPagesLocation().getAbsolutePath();
            srcPackages = component.getSrcPackagesLocation().getAbsolutePath();
        } else {
            this.baseFolder = baseFolder;
            FileObject fo = FileUtil.toFileObject(baseFolder);
            if (fo != null) {
                webPages = guessDocBase(fo);
                srcPackages = guessJavaRoot(fo);
            } else {
                webPages = ""; // NOI18N
                srcPackages = ""; // NOI18N
            }
        }
        component.setFolders(baseFolder, nbProjectFolder);
        component.setWebPages(webPages);
        component.setSrcPackages(srcPackages);
    }

    public void storeSettings(Object settings) {
        wizardDescriptor = (WizardDescriptor) settings;
        wizardDescriptor.putProperty(NewWebFreeformProjectWizardIterator.PROP_WEB_WEBMODULES, component.getWebModules());
        
        List l = component.getJavaSrcFolder();
        // at the moment there is always just one item
        assert l.size() == 1;
        ProjectModel pm = (ProjectModel) wizardDescriptor.getProperty(NewJ2SEFreeformProjectWizardIterator.PROP_PROJECT_MODEL);
        pm.clearSourceFolders();
        pm.addSourceFolder((FreeformProjectGenerator.SourceFolder)l.get(0));
        
        wizardDescriptor.putProperty(NewWebFreeformProjectWizardIterator.PROP_WEB_SOURCE_FOLDERS, component.getWebSrcFolder());
        wizardDescriptor.putProperty("NewProjectWizard_Title", null); // NOI18N
    }

    private String guessDocBase (FileObject dir) {
        Enumeration ch = dir.getChildren (true);
        while (ch.hasMoreElements ()) {
            FileObject f = (FileObject) ch.nextElement ();
            if (f.isFolder () && f.getName ().equals ("WEB-INF")) { // NOI18N
                if (f.getFileObject ("web.xml").isData ()) { // NOI18N
                    return FileUtil.toFile(f.getParent()).getAbsolutePath();
                }
            }
        }
        return ""; // NOI18N
    }

    private String guessJavaRoot (FileObject dir) {
        Enumeration ch = dir.getChildren (true);
        try {
            while (ch.hasMoreElements ()) {
                FileObject f = (FileObject) ch.nextElement ();
                if (f.getExt ().equals ("java")) { // NOI18N
                    String pckg = guessPackageName (f);
                    String pkgPath = f.getParent ().getPath ();
                    if (pckg != null && pkgPath.endsWith (pckg.replace ('.', '/'))) {
                        String rootName = pkgPath.substring (0, pkgPath.length () - pckg.length ());
                        return FileUtil.toFile(f.getFileSystem().findResource(rootName)).getAbsolutePath();
                    }
                }
            }
        } catch (FileStateInvalidException fsie) {
            ErrorManager.getDefault ().notify (ErrorManager.INFORMATIONAL, fsie);
        }
        return ""; // NOI18N
    }

    private String guessPackageName (FileObject f) {
        java.io.Reader r = null;
        try {
            r = new BufferedReader (new InputStreamReader (f.getInputStream (), "utf-8")); // NOI18N
            StringBuffer sb = new StringBuffer ();
            final char[] BUFFER = new char[4096];
            int len;

            for (;;) {
                len = r.read (BUFFER);
                if (len == -1) break;
                sb.append (BUFFER, 0, len);
            }
            int idx = sb.indexOf ("package"); // NOI18N
            if (idx >= 0) {
                int idx2 = sb.indexOf (";", idx);  // NOI18N
                if (idx2 >= 0) {
                    return sb.substring (idx + "package".length (), idx2).trim (); // NOI18N
                }
            }
        } catch (java.io.IOException ioe) {
            ErrorManager.getDefault ().notify (ErrorManager.INFORMATIONAL, ioe);
        } finally {
            try { if (r != null) r.close (); } catch (java.io.IOException ioe) { // ignore this
            }
        }
        return null;
    }

}