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/*

 * Copyright 2007, 2008, 2009, 2010 Electronic Business Systems Ltd.

 *

 * This file is part of GSS.

 *

 * GSS 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.

 *

 * GSS 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 GSS.  If not, see <http://www.gnu.org/licenses/>.

 */

package gr.ebs.gss.client;

import gr.ebs.gss.client.FilePropertiesDialog.Images;

import gr.ebs.gss.client.dnd.DnDTreeItem;

import gr.ebs.gss.client.rest.PostCommand;

import gr.ebs.gss.client.rest.RestException;

import gr.ebs.gss.client.rest.resource.FolderResource;

import gr.ebs.gss.client.rest.resource.GroupResource;

import gr.ebs.gss.client.rest.resource.PermissionHolder;

import java.util.List;

import java.util.Set;

import com.google.gwt.core.client.GWT;

import com.google.gwt.dom.client.NativeEvent;

import com.google.gwt.event.dom.client.ChangeEvent;

import com.google.gwt.event.dom.client.ChangeHandler;

import com.google.gwt.event.dom.client.ClickEvent;

import com.google.gwt.event.dom.client.ClickHandler;

import com.google.gwt.event.dom.client.KeyCodes;

import com.google.gwt.http.client.URL;

import com.google.gwt.i18n.client.DateTimeFormat;

import com.google.gwt.json.client.JSONArray;

import com.google.gwt.json.client.JSONBoolean;

import com.google.gwt.json.client.JSONObject;

import com.google.gwt.json.client.JSONString;

import com.google.gwt.user.client.DeferredCommand;

import com.google.gwt.user.client.Event.NativePreviewEvent;

import com.google.gwt.user.client.ui.Button;

import com.google.gwt.user.client.ui.CheckBox;

import com.google.gwt.user.client.ui.DecoratedTabPanel;

import com.google.gwt.user.client.ui.DialogBox;

import com.google.gwt.user.client.ui.FlexTable;

import com.google.gwt.user.client.ui.HasHorizontalAlignment;

import com.google.gwt.user.client.ui.HorizontalPanel;

import com.google.gwt.user.client.ui.Label;

import com.google.gwt.user.client.ui.TabPanel;

import com.google.gwt.user.client.ui.TextBox;

import com.google.gwt.user.client.ui.VerticalPanel;

/**

 * The 'Folder properties' dialog box implementation.

 */

public class FolderPropertiesDialog extends DialogBox {

        private List<GroupResource> groups = null;

        final PermissionsList permList;

        private CheckBox readForAll;

        /**

         * The widget that holds the folderName of the folder.

         */

        private TextBox folderName = new TextBox();

        /**

         * A flag that denotes whether the dialog will be used to create or modify a

         * folder.

         */

        private final boolean create;

        final FolderResource folder;

        final TabPanel inner;

        /**

         * The widget's constructor.

         *

         * @param images the image icons from the file properties dialog

         * @param _create true if the dialog is displayed for creating a new

         *            sub-folder of the selected folder, false if it is displayed

         *            for modifying the selected folder

         */

        public FolderPropertiesDialog(Images images, boolean _create,  final List<GroupResource> _groups) {

                setAnimationEnabled(true);

                // Enable IE selection for the dialog (must disable it upon closing it)

                GSS.enableIESelection();

                create = _create;

                DnDTreeItem folderItem = (DnDTreeItem)GSS.get().getFolders().getCurrent();

                folder = folderItem.getFolderResource();

                permList = new PermissionsList(images, folder.getPermissions(), folder.getOwner());

                groups = _groups;

                // Use this opportunity to set the dialog's caption.

                if (create)

                        setText("Create folder");

                else

                        setText("Folder properties");

                // Outer contains inner and buttons

                VerticalPanel outer = new VerticalPanel();

                // Inner contains generalPanel and permPanel

                inner = new DecoratedTabPanel();

                inner.setAnimationEnabled(true);

                VerticalPanel generalPanel = new VerticalPanel();

                VerticalPanel permPanel = new VerticalPanel();

                final HorizontalPanel permForAll = new HorizontalPanel();

                final HorizontalPanel pathPanel = new HorizontalPanel();

                HorizontalPanel buttons = new HorizontalPanel();

                HorizontalPanel permButtons = new HorizontalPanel();

                inner.add(generalPanel, "General");

                if (!create)

                        inner.add(permPanel, "Sharing");

                inner.selectTab(0);

                final Label folderNameNote = new Label("Please note that slashes ('/') are not allowed in folder names.", true);

                folderNameNote.setVisible(false);

                folderNameNote.setStylePrimaryName("gss-readForAllNote");

                FlexTable generalTable = new FlexTable();

                generalTable.setText(0, 0, "Name");

                generalTable.setText(1, 0, "Parent");

                generalTable.setText(2, 0, "Creator");

                generalTable.setText(3, 0, "Last modified");

                folderName.setText(create ? "" : folder.getName());

                generalTable.setWidget(0, 1, folderName);

                folderName.addChangeHandler(new ChangeHandler() {

                        @Override

                        public void onChange(ChangeEvent event) {

                                if(folderName.getText().contains("/"))

                                        folderNameNote.setVisible(true);

                                else

                                        folderNameNote.setVisible(false);                                

                        }

                });

                if (create)

                        generalTable.setText(1, 1, folder.getName());

                else if(folder.getParentName() == null)

                        generalTable.setText(1, 1, "-");

                else

                        generalTable.setText(1, 1, folder.getParentName());

                generalTable.setWidget(0, 2, folderNameNote);

                generalTable.setText(2, 1, folder.getOwner());

                DateTimeFormat formatter = DateTimeFormat.getFormat("d/M/yyyy h:mm a");

                if(folder.getModificationDate() != null)

                        generalTable.setText(3, 1, formatter.format(folder.getModificationDate()));

                generalTable.getFlexCellFormatter().setStyleName(0, 0, "props-labels");

                generalTable.getFlexCellFormatter().setStyleName(1, 0, "props-labels");

                generalTable.getFlexCellFormatter().setStyleName(2, 0, "props-labels");

                generalTable.getFlexCellFormatter().setStyleName(3, 0, "props-labels");

                generalTable.getFlexCellFormatter().setStyleName(0, 1, "props-values");

                generalTable.getFlexCellFormatter().setStyleName(1, 1, "props-values");

                generalTable.getFlexCellFormatter().setStyleName(2, 1, "props-values");

                generalTable.getFlexCellFormatter().setStyleName(3, 1, "props-values");

                generalTable.setCellSpacing(4);

                // Create the 'Create/Update' button, along with a listener that hides the dialog

                // when the button is clicked and quits the application.

                String okLabel;

                if (create)

                        okLabel = "Create";

                else

                        okLabel = "Update";

                Button ok = new Button(okLabel, new ClickHandler() {

                        @Override

                        public void onClick(ClickEvent event) {                                

                                if(folderName.getText().contains("/"))

                                        folderNameNote.setVisible(true);

                                else {

                                        folderNameNote.setVisible(false);

                                        createOrUpdateFolder();

                                        closeDialog();

                                }

                        }

                });                

                buttons.add(ok);

                buttons.setCellHorizontalAlignment(ok, HasHorizontalAlignment.ALIGN_CENTER);

                // Create the 'Cancel' button, along with a listener that hides the

                // dialog

                // when the button is clicked.

                Button cancel = new Button("Cancel", new ClickHandler() {

                        @Override

                        public void onClick(ClickEvent event) {

                                closeDialog();

                        }

                });

                buttons.add(cancel);

                buttons.setCellHorizontalAlignment(cancel, HasHorizontalAlignment.ALIGN_CENTER);

                buttons.setSpacing(8);

                buttons.addStyleName("gss-TabPanelBottom");

                Button add = new Button("Add Group", new ClickHandler() {

                        @Override

                        public void onClick(ClickEvent event) {

                                PermissionsAddDialog dlg = new PermissionsAddDialog(groups, permList, false);

                                dlg.center();

                        }

                });

                permButtons.add(add);

                permButtons.setCellHorizontalAlignment(add, HasHorizontalAlignment.ALIGN_CENTER);

                Button addUser = new Button("Add User", new ClickHandler() {

                        @Override

                        public void onClick(ClickEvent event) {

                                PermissionsAddDialog dlg = new PermissionsAddDialog(groups, permList, true);

                                dlg.center();

                        }

                });

                permButtons.add(addUser);

                permButtons.setCellHorizontalAlignment(addUser, HasHorizontalAlignment.ALIGN_CENTER);

                permButtons.setCellHorizontalAlignment(cancel, HasHorizontalAlignment.ALIGN_CENTER);

                permButtons.setSpacing(8);

                permButtons.addStyleName("gss-TabPanelBottom");

                final Label readForAllNote = new Label("When this option is enabled, the folder will be readable" +

                                        " by everyone. By checking this option, you are certifying that you have the right to " +

                                        "distribute this folder's contents and that it does not violate the Terms of Use.", true);

                readForAllNote.setVisible(false);

                readForAllNote.setStylePrimaryName("gss-readForAllNote");

                readForAll = new CheckBox();

                readForAll.setValue(folder.isReadForAll());

                readForAll.addClickHandler(new ClickHandler() {

                        @Override

                        public void onClick(ClickEvent event) {

                                readForAllNote.setVisible(readForAll.getValue());

                        }

                });

                generalPanel.add(generalTable);

                permPanel.add(permList);

                permPanel.add(permButtons);

                // Only show the read for all permission if the user is the owner.

                if (folder.getOwner().equals(GSS.get().getCurrentUserResource().getUsername())) {

                        permForAll.add(new Label("Public"));

                        permForAll.add(readForAll);

                        permForAll.setSpacing(8);

                        permForAll.addStyleName("gss-TabPanelBottom");

                        permForAll.add(readForAllNote);

                        permPanel.add(permForAll);

                }

                TextBox path = new TextBox();

                path.setWidth("100%");

                path.addClickHandler(new ClickHandler() {

                        @Override

                        public void onClick(ClickEvent event) {

                                GSS.enableIESelection();

                                ((TextBox) event.getSource()).selectAll();

                                GSS.preventIESelection();

                        }

                });

                path.setText(folder.getUri());

                path.setTitle("Use this link for sharing the folder via e-mail, IM, etc. (crtl-C/cmd-C to copy to system clipboard)");

                path.setWidth("100%");

                path.setReadOnly(true);

                pathPanel.setWidth("100%");

                pathPanel.setHorizontalAlignment(HasHorizontalAlignment.ALIGN_LEFT);

                pathPanel.add(new Label("Link"));

                pathPanel.setSpacing(8);

                pathPanel.addStyleName("gss-TabPanelBottom");

                pathPanel.add(path);

                permPanel.add(pathPanel);

                outer.add(inner);

                outer.add(buttons);

                outer.setCellHorizontalAlignment(buttons, HasHorizontalAlignment.ALIGN_CENTER);

                outer.addStyleName("gss-TabPanelBottom");

                setWidget(outer);

                /*if (create)

                        folderName.setFocus(true);

                else

                        ok.setFocus(true);*/

        }

        @Override

        public void center() {

                super.center();

                folderName.setFocus(true);

        }

        @Override

        protected void onPreviewNativeEvent(NativePreviewEvent preview) {

                super.onPreviewNativeEvent(preview);

                NativeEvent evt = preview.getNativeEvent();

                if (evt.getType().equals("keydown"))

                        // Use the popup's key preview hooks to close the dialog when either

                        // enter or escape is pressed.

                        switch (evt.getKeyCode()) {

                                case KeyCodes.KEY_ENTER:

                                        closeDialog();

                                        createOrUpdateFolder();

                                        break;

                                case KeyCodes.KEY_ESCAPE:

                                        closeDialog();

                                        break;

                        }

        }

        /**

         * Enables IE selection prevention and hides the dialog

         * (we disable the prevention on creation of the dialog)

         */

        public void closeDialog() {

                GSS.preventIESelection();

                hide();

        }

        /**

         * Generate an RPC request to create a new folder.

         *

         * @param userId the ID of the user whose namespace will be searched for

         *            folders

         * @param _folderName the name of the folder to create

         */

        private void createFolder() {

                String name = folderName.getText();

                if (!GSS.isValidResourceName(name)) {

                        GSS.get().displayError("The folder name '" + name + "' is invalid");

                        return;

                }

                PostCommand ep = new PostCommand(folder.getUri() + "?new=" +

                                URL.encodeComponent(name), "", 201) {

                        @Override

                        public void onComplete() {

                                GSS.get().getFolders().updateFolder((DnDTreeItem) GSS.get().getFolders().getCurrent());

                        }

                        @Override

                        public void onError(Throwable t) {

                                GWT.log("", t);

                                if(t instanceof RestException){

                                        int statusCode = ((RestException)t).getHttpStatusCode();

                                        if(statusCode == 405)

                                                GSS.get().displayError("You don't have the necessary" +

                                                                " permissions or a folder with same name " +

                                                                "already exists");

                                        else if(statusCode == 404)

                                                GSS.get().displayError("Resource not found");

                                        else

                                                GSS.get().displayError("Unable to create folder:" +

                                                                ((RestException)t).getHttpStatusText());

                                }

                                else

                                        GSS.get().displayError("System error creating folder:" +

                                                        t.getMessage());

                        }

                };

                DeferredCommand.addCommand(ep);

        }

        /**

         * Upon closing the dialog by clicking OK or pressing ENTER this method does

         * the actual work of modifying folder properties or creating a new Folder

         * depending on the value of the create field

         *

         * @param userId

         */

        private void createOrUpdateFolder() {

                if (create)

                        createFolder();

                else

                        updateFolder();

        }

        private void updateFolder() {

                permList.updatePermissionsAccordingToInput();

                Set<PermissionHolder> perms = permList.getPermissions();

                JSONObject json = new JSONObject();

                if(!folder.getName().equals(folderName.getText()))

                        json.put("name", new JSONString(folderName.getText()));

                //only update the read for all perm if the user is the owner

                if (readForAll.getValue() != folder.isReadForAll())

                        if (folder.getOwner().equals(GSS.get().getCurrentUserResource().getUsername()))

                                json.put("readForAll", JSONBoolean.getInstance(readForAll.getValue()));

                if (permList.hasChanges()) {

                        JSONArray perma = new JSONArray();

                        int i=0;

                        for(PermissionHolder p : perms){

                                JSONObject po = new JSONObject();

                                if(p.getUser() != null)

                                        po.put("user", new JSONString(p.getUser()));

                                if(p.getGroup() != null)

                                        po.put("group", new JSONString(p.getGroup()));

                                po.put("read", JSONBoolean.getInstance(p.isRead()));

                                po.put("write", JSONBoolean.getInstance(p.isWrite()));

                                po.put("modifyACL", JSONBoolean.getInstance(p.isModifyACL()));

                                perma.set(i,po);

                                i++;

                        }

                        json.put("permissions", perma);

                        GWT.log(json.toString(), null);

                }

                PostCommand ep = new PostCommand(folder.getUri()+"?update=", json.toString(), 200){

                        @Override

                        public void onComplete() {

                                if(getPostBody() != null && !"".equals(getPostBody().trim())){

                                        DnDTreeItem folderItem = (DnDTreeItem) GSS.get().getFolders().getCurrent();

                                        FolderResource fres = folderItem.getFolderResource();

                                        String initialPath = fres.getUri();

                                        String newPath =  getPostBody().trim();

                                        fres.setUri(newPath);

                                        if(folderItem.getParentItem() != null && ((DnDTreeItem)folderItem.getParentItem()).getFolderResource() != null){

                                                ((DnDTreeItem)folderItem.getParentItem()).getFolderResource().removeSubfolderPath(initialPath);

                                                ((DnDTreeItem)folderItem.getParentItem()).getFolderResource().getSubfolderPaths().add(newPath);

                                        }

                                }

                                GSS.get().getFolders().updateFolder( (DnDTreeItem) GSS.get().getFolders().getCurrent());

                                GSS.get().showFileList(true);

                        }

                        @Override

                        public void onError(Throwable t) {

                                GWT.log("", t);

                                if(t instanceof RestException){

                                        int statusCode = ((RestException)t).getHttpStatusCode();

                                        if(statusCode == 405)

                                                GSS.get().displayError("You don't have the necessary permissions or" +

                                                                " a folder with same name already exists");

                                        else if(statusCode == 404)

                                                GSS.get().displayError("Resource not found, or user specified in sharing does not exist");

                                        else

                                                GSS.get().displayError("Unable to update folder: "+((RestException)t).getHttpStatusText());

                                }

                                else

                                        GSS.get().displayError("System error moifying file: "+t.getMessage());

                                GSS.get().getFolders().updateFolder( (DnDTreeItem) GSS.get().getFolders().getCurrent());

                        }

                };

                DeferredCommand.addCommand(ep);

        }

        public void selectTab(int _tab) {

                inner.selectTab(_tab);

        }

}