/*
 *                 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.web.project.ui.wizards;

import java.awt.Component;
import java.awt.Dialog;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.text.MessageFormat;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Iterator;
import java.util.NoSuchElementException;
import java.util.Set;

import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

import org.openide.DialogDescriptor;
import org.openide.DialogDisplayer;
import org.openide.ErrorManager;
import org.openide.NotifyDescriptor;
import org.openide.WizardDescriptor;
import org.openide.WizardValidationException;
import org.openide.filesystems.FileObject;
import org.openide.filesystems.FileStateInvalidException;
import org.openide.filesystems.FileUtil;
import org.openide.loaders.DataObject;
import org.openide.loaders.TemplateWizard;
import org.openide.util.HelpCtx;
import org.openide.util.NbBundle;

import org.netbeans.api.project.Project;
import org.netbeans.api.project.ProjectManager;

import org.netbeans.modules.web.api.webmodule.WebModule;
import org.netbeans.modules.web.project.ProjectWebModule;
import org.netbeans.modules.web.project.WebProjectGenerator;
import org.netbeans.spi.project.support.ant.GeneratedFilesHelper;

/**
 * Wizard to create a new Web project for an existing web module.
 * @author Pavel Buzek, Radko Najman
 */
public class ImportWebProjectWizardIterator implements TemplateWizard.Iterator {
    
    private static final long serialVersionUID = 1L;
    private String buildfileName = GeneratedFilesHelper.BUILD_XML_PATH;
    private boolean imp = true;
    
    private String moduleLoc;
    
    /** Create a new wizard iterator. */
    public ImportWebProjectWizardIterator () {}
    
    private WizardDescriptor.Panel[] createPanels() {
        return new WizardDescriptor.Panel[] {
            new ImportWebProjectWizardIterator.ThePanel(),
            new ImportWebProjectWizardIterator.SecondPanel()
        };
    }
    
    private String[] createSteps() {
        return new String[] {
            NbBundle.getMessage(ImportWebProjectWizardIterator.class, "LBL_IW_Step1"), //NOI18N
            NbBundle.getMessage(ImportWebProjectWizardIterator.class, "LBL_IW_Step2") //NOI18N
        };
    }
    
    public Set/**/ instantiate(TemplateWizard wiz) throws IOException/*, IllegalStateException*/ {
        //project creation cancelled
        if (!isImport())
            return null;
        
        File dirF = (File) wiz.getProperty(WizardProperties.PROJECT_DIR);
        File dirSrcF = (File) wiz.getProperty (WizardProperties.SOURCE_ROOT);
        String name = (String) wiz.getProperty(WizardProperties.NAME);
        String contextPath = (String) wiz.getProperty(WizardProperties.CONTEXT_PATH);
        String docBaseName = (String) wiz.getProperty(WizardProperties.DOC_BASE);
        String javaRootName = (String) wiz.getProperty(WizardProperties.JAVA_ROOT);
        String libName = (String) wiz.getProperty(WizardProperties.LIB_FOLDER);
        
        FileObject wmFO = FileUtil.toFileObject (dirSrcF);
        assert wmFO != null : "No such dir on disk: " + dirSrcF;
        assert wmFO.isFolder() : "Not really a dir: " + dirSrcF;
        
        FileObject javaRoot;
        FileObject docBase;
        FileObject libFolder;
        if (docBaseName == null || docBaseName.equals("")) //NOI18N
            docBase = guessDocBase(wmFO);
        else {
            File f = new File(docBaseName);
            docBase = FileUtil.toFileObject(f);
        }
        if (javaRootName == null || javaRootName.equals("")) //NOI18N
            javaRoot = guessJavaRoot(wmFO);
        else {
            File f = new File(javaRootName);
            javaRoot = FileUtil.toFileObject(f);
        }
        if (libName == null || libName.equals("")) //NOI18N
            libFolder = guessLibrariesFolder(wmFO);
        else {
            File f = new File(libName);
            libFolder = FileUtil.toFileObject(f);
        }       
        
        String buildfile = getBuildfile();
        
        WebProjectGenerator.importProject (dirF, name, wmFO, javaRoot, docBase, libFolder, WebModule.J2EE_14_LEVEL, buildfile); //PENDING detect spec level
        FileObject dir = FileUtil.toFileObject (dirF);
        Project p = ProjectManager.getDefault().findProject(dir);
        
        ProjectWebModule wm = (ProjectWebModule) p.getLookup ().lookup (ProjectWebModule.class);
        if (wm != null) //should not be null
            wm.setContextPath(contextPath);

        // Returning set of DataObject of project diretory. 
        // Project will be open and set as main
        return Collections.singleton(DataObject.find(dir));
    }
    
    private String getBuildfile() {
        return buildfileName;
    }
    
    private void setBuildfile(String name) {
        buildfileName = name;
    }
    
    private boolean isImport() {
        return imp;
    }

    private void setImport(boolean imp) {
        this.imp = imp;
    }
    
    private transient int index;
    private transient WizardDescriptor.Panel[] panels;
    private transient TemplateWizard wiz;
    
    public void initialize(TemplateWizard wiz) {
        this.wiz = wiz;
        index = 0;
        panels = createPanels();
        // Make sure list of steps is accurate.
        String[] steps = createSteps();
        for (int i = 0; i < panels.length; i++) {
            Component c = panels[i].getComponent();
            if (steps[i] == null) {
                // Default step name to component name of panel.
                // Mainly useful for getting the name of the target
                // chooser to appear in the list of steps.
                steps[i] = c.getName();
            }
            if (c instanceof JComponent) { // assume Swing components
                JComponent jc = (JComponent)c;
                jc.putClientProperty("NewProjectWizard_Title", NbBundle.getMessage(ImportWebProjectWizardIterator.class, "TXT_WebExtSources")); // NOI18N
                // Step #.
                jc.putClientProperty("WizardPanel_contentSelectedIndex", new Integer(i)); // NOI18N
                // Step name (actually the whole list for reference).
                jc.putClientProperty("WizardPanel_contentData", steps); // NOI18N
            }
        }
    }
    public void uninitialize(TemplateWizard wiz) {
        this.wiz = null;
        panels = null;
    }
    
    public String name() {
        return MessageFormat.format(NbBundle.getMessage(ImportWebProjectWizardIterator.class, "LBL_WizardStepsCount"), new String[] {(new Integer(index + 1)).toString(), (new Integer(panels.length)).toString()}); //NOI18N
    }
    
    public boolean hasNext() {
        return index < panels.length - 1;
    }
    public boolean hasPrevious() {
        return index > 0;
    }
    public void nextPanel() {
        if (!hasNext()) throw new NoSuchElementException();
        index++;
    }
    public void previousPanel() {
        if (!hasPrevious()) throw new NoSuchElementException();
        index--;
    }
    public WizardDescriptor.Panel current() {
        return panels[index];
    }
    
    // If nothing unusual changes in the middle of the wizard, simply:
    public final void addChangeListener(ChangeListener l) {}
    public final void removeChangeListener(ChangeListener l) {}
    // If something changes dynamically (besides moving between panels),
    // e.g. the number of panels changes in response to user input, then
    // uncomment the following and call when needed:
    // fireChangeEvent();
    /*
    private transient Set listeners = new HashSet(1); // Set
    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);
        }
    }
    private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
        in.defaultReadObject();
        listeners = new HashSet(1);
    }
     */

    private FileObject guessDocBase (FileObject dir) {
        Enumeration ch = dir.getChildren (true);
        while (ch.hasMoreElements ()) {
            FileObject f = (FileObject) ch.nextElement ();
            if (f.isFolder () && f.getName ().equals ("WEB-INF")) {
                if (f.getFileObject ("web.xml").isData ()) {
                    return f.getParent ();
                }
            }
        }
        return null;
    }
    
    private FileObject guessLibrariesFolder (FileObject dir) {
        FileObject docBase = guessDocBase (dir);
        if (docBase != null) {
            FileObject lib = docBase.getFileObject ("WEB-INF/lib"); //NOI18N
            if (lib != null) {
                return lib;
            }
        }
        Enumeration ch = dir.getChildren (true);
        while (ch.hasMoreElements ()) {
            FileObject f = (FileObject) ch.nextElement ();
            if (f.getExt ().equals ("jar")) { //NOI18N
                return f.getParent ();
            }
        }
        return null;
    }
    
    private FileObject 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 f.getFileSystem ().findResource (rootName);
                    }
                }
            }
        } catch (FileStateInvalidException fsie) {
            ErrorManager.getDefault ().notify (ErrorManager.INFORMATIONAL, fsie);
        }
        return null;
    }
    
    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 ();
                }
            }
        } 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;
    }
    
    public final class ThePanel implements WizardDescriptor.FinishablePanel, WizardDescriptor.ValidatingPanel {

        private ImportLocationVisual panel;
        private WizardDescriptor wizardDescriptor;
        
        private ThePanel () {
        }
        
        public boolean isFinishPanel() {
            return false;
        }

        public java.awt.Component getComponent () {
            if (panel == null) {
                panel = new ImportLocationVisual (this);
            }
            return panel;
        }
        
        public HelpCtx getHelp() {
            return new HelpCtx(ThePanel.class);
        }

        public boolean isValid () {
            getComponent();
            return panel.valid(wizardDescriptor);
        }
        
        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;        
            panel.read(wizardDescriptor);

            // XXX hack, TemplateWizard in final setTemplateImpl() forces new wizard's title
            // this name is used in NewProjectWizard to modify the title
            Object substitute = ((JComponent) panel).getClientProperty("NewProjectWizard_Title"); //NOI18N
            if (substitute != null)
                wizardDescriptor.putProperty("NewProjectWizard_Title", substitute); //NOI18N
        }
        
        public void storeSettings (Object settings) {
            WizardDescriptor d = (WizardDescriptor) settings;
            panel.store(d);
            ((WizardDescriptor) d).putProperty ("NewProjectWizard_Title", null); //NOI18N
            
            moduleLoc = panel.moduleLocationTextField.getText().trim();
        }
        
        private boolean isWebModule (FileObject dir) {
            return guessDocBase (dir) != null && guessJavaRoot (dir) != null;
        }
    
        //use it as a project root iff it is not sources or document root
        public boolean isSuitableProjectRoot (FileObject dir) {
            FileObject docRoot = guessDocBase (dir);
            FileObject srcRoot = guessJavaRoot (dir);
            return (docRoot == null || FileUtil.isParentOf (dir, docRoot))
                && (srcRoot == null || FileUtil.isParentOf (dir, srcRoot));
        }
    
        //extra finish dialog        
        private Dialog dialog;
            
        public void validate() throws WizardValidationException {
            File dirF = new File(panel.projectLocationTextField.getText());
            JButton ok = new JButton(NbBundle.getMessage(ImportWebProjectWizardIterator.class, "LBL_IW_Buildfile_OK")); //NOI18N
            ok.getAccessibleContext().setAccessibleDescription(NbBundle.getMessage(ImportWebProjectWizardIterator.class, "ACS_IW_BuildFileDialog_OKButton_LabelMnemonic")); //NOI18N
            ok.setMnemonic(NbBundle.getMessage(ImportWebProjectWizardIterator.class, "LBL_IW_BuildFileDialog_OK_LabelMnemonic").charAt(0)); //NOI18N
            JButton cancel = new JButton(NbBundle.getMessage(ImportWebProjectWizardIterator.class, "LBL_IW_Buildfile_Cancel")); //NOI18N
            cancel.getAccessibleContext().setAccessibleDescription(NbBundle.getMessage(ImportWebProjectWizardIterator.class, "ACS_IW_BuildFileDialog_CancelButton_LabelMnemonic")); //NOI18N
            cancel.setMnemonic(NbBundle.getMessage(ImportWebProjectWizardIterator.class, "LBL_IW_BuildFileDialog_Cancel_LabelMnemonic").charAt(0)); //NOI18N
            
            final ImportBuildfile ibf = new ImportBuildfile(dirF.getAbsolutePath(), ok);
            if ((new File(dirF, GeneratedFilesHelper.BUILD_XML_PATH)).exists()) {
                ActionListener actionListener = new ActionListener() {
                    public void actionPerformed(ActionEvent event) {
                        Object src = event.getSource();
                        if (src instanceof JButton) {
                            String name = ((JButton) src).getText();
                            if (name.equals(NbBundle.getMessage(ImportWebProjectWizardIterator.class, "LBL_IW_Buildfile_OK"))) { //NOI18N
                                setBuildfile(ibf.getBuildName());
                                setImport(true);
                                closeDialog();
                            } else if (name.equals(NbBundle.getMessage(ImportWebProjectWizardIterator.class, "LBL_IW_Buildfile_Cancel"))) { //NOI18N
                                NotifyDescriptor ndesc = new NotifyDescriptor.Confirmation(NbBundle.getMessage(ImportWebProjectWizardIterator.class, "LBL_IW_Buildfile_CancelConfirmation"), NotifyDescriptor.YES_NO_OPTION); //NOI18N
                                Object ret = DialogDisplayer.getDefault().notify(ndesc);
                                if (ret == NotifyDescriptor.YES_OPTION) {
                                    setImport(false);
                                    closeDialog();
                                }
                            }
                        }
                    }
                };

                DialogDescriptor descriptor = new DialogDescriptor(
                    ibf,
                    NbBundle.getMessage(ImportWebProjectWizardIterator.class, "LBL_IW_BuildfileTitle"), //NOI18N
                    true,
                    new Object[] {ok, cancel},
                    DialogDescriptor.OK_OPTION, 
                    DialogDescriptor.DEFAULT_ALIGN,
                    null,
                    actionListener
                );
                
                dialog = DialogDisplayer.getDefault().createDialog(descriptor);
                dialog.show();
            } else
                return;            
        }
        
        private void closeDialog() {
            dialog.dispose();
        }
    }
    
    public final class SecondPanel implements WizardDescriptor.FinishablePanel, WizardDescriptor.ValidatingPanel {
        private ImportWebLocationsVisual panel;
        
        private SecondPanel () {
        }
        
        public boolean isFinishPanel() {
            return true;
        }
        
        public java.awt.Component getComponent () {
            if (panel == null)
                panel = new ImportWebLocationsVisual(this);
            
            return panel;
        }
        
        public HelpCtx getHelp() {
            return new HelpCtx(SecondPanel.class);
        }
        
        public boolean isValid () {
            boolean res1 = false;
            boolean res2 = false;
            boolean res3 = true;
            
            if (panel.jTextFieldWebPages.getText().trim().length() > 0)
                res1 = relativePath(panel.jTextFieldWebPages.getText().trim());
            if (panel.jTextFieldJavaSources.getText().trim().length() > 0)
                res2 = relativePath(panel.jTextFieldJavaSources.getText().trim());
            if (panel.jTextFieldLibraries.getText().trim().length() > 0)
                res3 = relativePath(panel.jTextFieldLibraries.getText().trim());
                
            return res1 && res2 && res3;
        }
        
        private boolean relativePath(String path) {
            String moduleRoot = ((ImportLocationVisual) panels[0].getComponent()).moduleLocationTextField.getText().trim();
            File fp = new File(moduleRoot);
            FileObject parent = FileUtil.toFileObject(fp);

            File fch = new File(path);
            FileObject child;
            try {
                child = FileUtil.toFileObject(fch);
            } catch (Exception exc) {
                return false;
            }
            if (child == null)
                return false;
            
            if (child.equals(parent))
                return true;
            if (!FileUtil.isParentOf(parent, child))
                return false;
            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) {
            presetSecondPanel(moduleLoc);
            
            // XXX hack, TemplateWizard in final setTemplateImpl() forces new wizard's title
            // this name is used in NewProjectWizard to modify the title
            Object substitute = ((JComponent) panel).getClientProperty("NewProjectWizard_Title"); //NOI18N
            if (substitute != null)
                ((WizardDescriptor) settings).putProperty("NewProjectWizard_Title", substitute); //NOI18N
        }
        
        public void storeSettings (Object settings) {
            WizardDescriptor d = (WizardDescriptor) settings;
            
            d.putProperty(WizardProperties.DOC_BASE, panel.jTextFieldWebPages.getText().trim());
            d.putProperty(WizardProperties.JAVA_ROOT, panel.jTextFieldJavaSources.getText().trim());
            d.putProperty(WizardProperties.LIB_FOLDER, panel.jTextFieldLibraries.getText().trim());
            d.putProperty(WizardProperties.J2EE_LEVEL, panel.j2eeLevel);

            d.putProperty("NewProjectWizard_Title", null); //NOI18N
        }
        
        private void presetSecondPanel(String sourceRoot) {
            if (sourceRoot.length() > 0) {
                File f = new File(sourceRoot);
                FileObject fo;
                try {
                    fo = FileUtil.toFileObject(f);
                } catch (IllegalArgumentException exc) {
                    return; //invalid file object
                }
                if (fo != null) {
                    FileObject guessFO;
                    String webPages = ""; //NOI18N
                    String javaSources = ""; //NOI18N
                    String libraries = ""; //NOI18N

                    guessFO = guessDocBase(fo);
                    if (guessFO != null)
                        webPages = FileUtil.toFile(guessFO).getPath();
                    guessFO = guessJavaRoot(fo);
                    if (guessFO != null)
                        javaSources = FileUtil.toFile(guessFO).getPath();
                    guessFO = guessLibrariesFolder(fo);
                    if (guessFO != null)
                        libraries = FileUtil.toFile(guessFO).getPath();

                    ((ImportWebLocationsVisual) panels[1].getComponent()).initValues(sourceRoot, webPages, javaSources, libraries);
                }
            }
        }

        public void validate() throws WizardValidationException {
            panel.validateLocations();
        }
    }
}