/*

 * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 * questions.

 */

package javax.swing.text.html;

import java.net.*;

import java.io.*;

import java.awt.*;

import java.awt.event.*;

import java.util.*;

import javax.swing.*;

import javax.swing.event.*;

import javax.swing.text.*;

/**

 * Component decorator that implements the view interface

 * for form elements, <input>, <textarea>,

 * and <select>.  The model for the component is stored

 * and is used to build the component of the view.  The type

 * of the model is assumed to of the type that would be set by

 * <code>HTMLDocument.HTMLReader.FormAction</code>.  If there are

 * multiple views mapped over the document, they will share the

 * embedded component models.

 * <p>

 * The following table shows what components get built

 * by this view.

 * <table summary="shows what components get built by this view">

 * <tr>

 *   <th>Element Type</th>

 *   <th>Component built</th>

 * </tr>

 * <tr>

 *   <td>input, type button</td>

 *   <td>JButton</td>

 * </tr>

 * <tr>

 *   <td>input, type checkbox</td>

 *   <td>JCheckBox</td>

 * </tr>

 * <tr>

 *   <td>input, type image</td>

 *   <td>JButton</td>

 * </tr>

 * <tr>

 *   <td>input, type password</td>

 *   <td>JPasswordField</td>

 * </tr>

 * <tr>

 *   <td>input, type radio</td>

 *   <td>JRadioButton</td>

 * </tr>

 * <tr>

 *   <td>input, type reset</td>

 *   <td>JButton</td>

 * </tr>

 * <tr>

 *   <td>input, type submit</td>

 *   <td>JButton</td>

 * </tr>

 * <tr>

 *   <td>input, type text</td>

 *   <td>JTextField</td>

 * </tr>

 * <tr>

 *   <td>select, size &gt; 1 or multiple attribute defined</td>

 *   <td>JList in a JScrollPane</td>

 * </tr>

 * <tr>

 *   <td>select, size unspecified or 1</td>

 *   <td>JComboBox</td>

 * </tr>

 * <tr>

 *   <td>textarea</td>

 *   <td>JTextArea in a JScrollPane</td>

 * </tr>

 * <tr>

 *   <td>input, type file</td>

 *   <td>JTextField</td>

 * </tr>

 * </table>

 *

 * @author Timothy Prinzing

 * @author Sunita Mani

 */

public class FormView extends ComponentView implements ActionListener {

    /**

     * If a value attribute is not specified for a FORM input element

     * of type "submit", then this default string is used.

     *

     * @deprecated As of 1.3, value now comes from UIManager property

     *             FormView.submitButtonText

     */

    @Deprecated

    public static final String SUBMIT = new String("Submit Query");

    /**

     * If a value attribute is not specified for a FORM input element

     * of type "reset", then this default string is used.

     *

     * @deprecated As of 1.3, value comes from UIManager UIManager property

     *             FormView.resetButtonText

     */

    @Deprecated

    public static final String RESET = new String("Reset");

    /**

     * Document attribute name for storing POST data. JEditorPane.getPostData()

     * uses the same name, should be kept in sync.

     */

    final static String PostDataProperty = "javax.swing.JEditorPane.postdata";

    /**

     * Used to indicate if the maximum span should be the same as the

     * preferred span. This is used so that the Component's size doesn't

     * change if there is extra room on a line. The first bit is used for

     * the X direction, and the second for the y direction.

     */

    private short maxIsPreferred;

    /**

     * Creates a new FormView object.

     *

     * @param elem the element to decorate

     */

    public FormView(Element elem) {

        super(elem);

    }

    /**

     * Create the component.  This is basically a

     * big switch statement based upon the tag type

     * and html attributes of the associated element.

     */

    protected Component createComponent() {

        AttributeSet attr = getElement().getAttributes();

        HTML.Tag t = (HTML.Tag)

            attr.getAttribute(StyleConstants.NameAttribute);

        JComponent c = null;

        Object model = attr.getAttribute(StyleConstants.ModelAttribute);

        // Remove listeners previously registered in shared model

        // when a new UI component is replaced.  See bug 7189299.

        removeStaleListenerForModel(model);

        if (t == HTML.Tag.INPUT) {

            c = createInputComponent(attr, model);

        } else if (t == HTML.Tag.SELECT) {

            if (model instanceof OptionListModel) {

                @SuppressWarnings("unchecked")

                JList<?> list = new JList<>((ListModel) model);

                int size = HTML.getIntegerAttributeValue(attr,

                                                         HTML.Attribute.SIZE,

                                                         1);

                list.setVisibleRowCount(size);

                list.setSelectionModel((ListSelectionModel)model);

                c = new JScrollPane(list);

            } else {

                @SuppressWarnings("unchecked")

                JComboBox<?> tmp = new JComboBox<>((ComboBoxModel) model);

                c = tmp;

                maxIsPreferred = 3;

            }

        } else if (t == HTML.Tag.TEXTAREA) {

            JTextArea area = new JTextArea((Document) model);

            int rows = HTML.getIntegerAttributeValue(attr,

                                                     HTML.Attribute.ROWS,

                                                     1);

            area.setRows(rows);

            int cols = HTML.getIntegerAttributeValue(attr,

                                                     HTML.Attribute.COLS,

                                                     20);

            maxIsPreferred = 3;

            area.setColumns(cols);

            c = new JScrollPane(area,

                                JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,

                                JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);

        }

        if (c != null) {

            c.setAlignmentY(1.0f);

        }

        return c;

    }

    /**

     * Creates a component for an <INPUT> element based on the

     * value of the "type" attribute.

     *

     * @param set of attributes associated with the <INPUT> element.

     * @param model the value of the StyleConstants.ModelAttribute

     * @return the component.

     */

    private JComponent createInputComponent(AttributeSet attr, Object model) {

        JComponent c = null;

        String type = (String) attr.getAttribute(HTML.Attribute.TYPE);

        if (type.equals("submit") || type.equals("reset")) {

            String value = (String)

                attr.getAttribute(HTML.Attribute.VALUE);

            if (value == null) {

                if (type.equals("submit")) {

                    value = UIManager.getString("FormView.submitButtonText");

                } else {

                    value = UIManager.getString("FormView.resetButtonText");

                }

            }

            JButton button = new JButton(value);

            if (model != null) {

                button.setModel((ButtonModel)model);

                button.addActionListener(this);

            }

            c = button;

            maxIsPreferred = 3;

        } else if (type.equals("image")) {

            String srcAtt = (String) attr.getAttribute(HTML.Attribute.SRC);

            JButton button;

            try {

                URL base = ((HTMLDocument)getElement().getDocument()).getBase();

                URL srcURL = new URL(base, srcAtt);

                Icon icon = new ImageIcon(srcURL);

                button  = new JButton(icon);

            } catch (MalformedURLException e) {

                button = new JButton(srcAtt);

            }

            if (model != null) {

                button.setModel((ButtonModel)model);

                button.addMouseListener(new MouseEventListener());

            }

            c = button;

            maxIsPreferred = 3;

        } else if (type.equals("checkbox")) {

            c = new JCheckBox();

            if (model != null) {

                ((JCheckBox)c).setModel((JToggleButton.ToggleButtonModel) model);

            }

            maxIsPreferred = 3;

        } else if (type.equals("radio")) {

            c = new JRadioButton();

            if (model != null) {

                ((JRadioButton)c).setModel((JToggleButton.ToggleButtonModel)model);

            }

            maxIsPreferred = 3;

        } else if (type.equals("text")) {

            int size = HTML.getIntegerAttributeValue(attr,

                                                     HTML.Attribute.SIZE,

                                                     -1);

            JTextField field;

            if (size > 0) {

                field = new JTextField();

                field.setColumns(size);

            }

            else {

                field = new JTextField();

                field.setColumns(20);

            }

            c = field;

            if (model != null) {

                field.setDocument((Document) model);

            }

            field.addActionListener(this);

            maxIsPreferred = 3;

        } else if (type.equals("password")) {

            JPasswordField field = new JPasswordField();

            c = field;

            if (model != null) {

                field.setDocument((Document) model);

            }

            int size = HTML.getIntegerAttributeValue(attr,

                                                     HTML.Attribute.SIZE,

                                                     -1);

            field.setColumns((size > 0) ? size : 20);

            field.addActionListener(this);

            maxIsPreferred = 3;

        } else if (type.equals("file")) {

            JTextField field = new JTextField();

            if (model != null) {

                field.setDocument((Document)model);

            }

            int size = HTML.getIntegerAttributeValue(attr, HTML.Attribute.SIZE,

                                                     -1);

            field.setColumns((size > 0) ? size : 20);

            JButton browseButton = new JButton(UIManager.getString

                                           ("FormView.browseFileButtonText"));

            Box box = Box.createHorizontalBox();

            box.add(field);

            box.add(Box.createHorizontalStrut(5));

            box.add(browseButton);

            browseButton.addActionListener(new BrowseFileAction(

                                           attr, (Document)model));

            c = box;

            maxIsPreferred = 3;

        }

        return c;

    }

    private void removeStaleListenerForModel(Object model) {

        if (model instanceof DefaultButtonModel) {

            // case of JButton whose model is DefaultButtonModel

            // Need to remove stale ActionListener, ChangeListener and

            // ItemListener that are instance of AbstractButton$Handler.

            DefaultButtonModel buttonModel = (DefaultButtonModel) model;

            String listenerClass = "javax.swing.AbstractButton$Handler";

            for (ActionListener listener : buttonModel.getActionListeners()) {

                if (listenerClass.equals(listener.getClass().getName())) {

                    buttonModel.removeActionListener(listener);

                }

            }

            for (ChangeListener listener : buttonModel.getChangeListeners()) {

                if (listenerClass.equals(listener.getClass().getName())) {

                    buttonModel.removeChangeListener(listener);

                }

            }

            for (ItemListener listener : buttonModel.getItemListeners()) {

                if (listenerClass.equals(listener.getClass().getName())) {

                    buttonModel.removeItemListener(listener);

                }

            }

        } else if (model instanceof AbstractListModel) {

            // case of JComboBox and JList

            // For JList, the stale ListDataListener is instance

            // BasicListUI$Handler.

            // For JComboBox, there are 2 stale ListDataListeners, which are

            // BasicListUI$Handler and BasicComboBoxUI$Handler.

            @SuppressWarnings("unchecked")

            AbstractListModel<?> listModel = (AbstractListModel) model;

            String listenerClass1 =

                    "javax.swing.plaf.basic.BasicListUI$Handler";

            String listenerClass2 =

                    "javax.swing.plaf.basic.BasicComboBoxUI$Handler";

            for (ListDataListener listener : listModel.getListDataListeners()) {

                if (listenerClass1.equals(listener.getClass().getName())

                        || listenerClass2.equals(listener.getClass().getName()))

                {

                    listModel.removeListDataListener(listener);

                }

            }

        } else if (model instanceof AbstractDocument) {

            // case of JPasswordField, JTextField and JTextArea

            // All have 2 stale DocumentListeners.

            String listenerClass1 =

                    "javax.swing.plaf.basic.BasicTextUI$UpdateHandler";

            String listenerClass2 =

                    "javax.swing.text.DefaultCaret$Handler";

            AbstractDocument docModel = (AbstractDocument) model;

            for (DocumentListener listener : docModel.getDocumentListeners()) {

                if (listenerClass1.equals(listener.getClass().getName())

                        || listenerClass2.equals(listener.getClass().getName()))

                {

                    docModel.removeDocumentListener(listener);

                }

            }

        }

    }

    /**

     * Determines the maximum span for this view along an

     * axis. For certain components, the maximum and preferred span are the

     * same. For others this will return the value

     * returned by Component.getMaximumSize along the

     * axis of interest.

     *

     * @param axis may be either View.X_AXIS or View.Y_AXIS

     * @return   the span the view would like to be rendered into >= 0.

     *           Typically the view is told to render into the span

     *           that is returned, although there is no guarantee.

     *           The parent may choose to resize or break the view.

     * @exception IllegalArgumentException for an invalid axis

     */

    public float getMaximumSpan(int axis) {

        switch (axis) {

        case View.X_AXIS:

            if ((maxIsPreferred & 1) == 1) {

                super.getMaximumSpan(axis);

                return getPreferredSpan(axis);

            }

            return super.getMaximumSpan(axis);

        case View.Y_AXIS:

            if ((maxIsPreferred & 2) == 2) {

                super.getMaximumSpan(axis);

                return getPreferredSpan(axis);

            }

            return super.getMaximumSpan(axis);

        default:

            break;

        }

        return super.getMaximumSpan(axis);

    }

    /**

     * Responsible for processing the ActionEvent.

     * If the element associated with the FormView,

     * has a type of "submit", "reset", "text" or "password"

     * then the action is processed.  In the case of a "submit"

     * the form is submitted.  In the case of a "reset"

     * the form is reset to its original state.

     * In the case of "text" or "password", if the

     * element is the last one of type "text" or "password",

     * the form is submitted.  Otherwise, focus is transferred

     * to the next component in the form.

     *

     * @param evt the ActionEvent.

     */

    public void actionPerformed(ActionEvent evt) {

        Element element = getElement();

        StringBuilder dataBuffer = new StringBuilder();

        HTMLDocument doc = (HTMLDocument)getDocument();

        AttributeSet attr = element.getAttributes();

        String type = (String) attr.getAttribute(HTML.Attribute.TYPE);

        if (type.equals("submit")) {

            getFormData(dataBuffer);

            submitData(dataBuffer.toString());

        } else if (type.equals("reset")) {

            resetForm();

        } else if (type.equals("text") || type.equals("password")) {

            if (isLastTextOrPasswordField()) {

                getFormData(dataBuffer);

                submitData(dataBuffer.toString());

            } else {

                getComponent().transferFocus();

            }

        }

    }

    /**

     * This method is responsible for submitting the form data.

     * A thread is forked to undertake the submission.

     *

     * @param data data to submit

     */

    protected void submitData(String data) {

        Element form = getFormElement();

        AttributeSet attrs = form.getAttributes();

        HTMLDocument doc = (HTMLDocument) form.getDocument();

        URL base = doc.getBase();

        String target = (String) attrs.getAttribute(HTML.Attribute.TARGET);

        if (target == null) {

            target = "_self";

        }

        String method = (String) attrs.getAttribute(HTML.Attribute.METHOD);

        if (method == null) {

            method = "GET";

        }

        method = method.toLowerCase();

        boolean isPostMethod = method.equals("post");

        if (isPostMethod) {

            storePostData(doc, target, data);

        }

        String action = (String) attrs.getAttribute(HTML.Attribute.ACTION);

        URL actionURL;

        try {

            actionURL = (action == null)

                ? new URL(base.getProtocol(), base.getHost(),

                                        base.getPort(), base.getFile())

                : new URL(base, action);

            if (!isPostMethod) {

                String query = data.toString();

                actionURL = new URL(actionURL + "?" + query);

            }

        } catch (MalformedURLException e) {

            actionURL = null;

        }

        final JEditorPane c = (JEditorPane) getContainer();

        HTMLEditorKit kit = (HTMLEditorKit) c.getEditorKit();

        FormSubmitEvent formEvent = null;

        if (!kit.isAutoFormSubmission() || doc.isFrameDocument()) {

            FormSubmitEvent.MethodType methodType = isPostMethod

                    ? FormSubmitEvent.MethodType.POST

                    : FormSubmitEvent.MethodType.GET;

            formEvent = new FormSubmitEvent(

                    FormView.this, HyperlinkEvent.EventType.ACTIVATED,

                    actionURL, form, target, methodType, data);

        }

        // setPage() may take significant time so schedule it to run later.

        final FormSubmitEvent fse = formEvent;

        final URL url = actionURL;

        SwingUtilities.invokeLater(new Runnable() {

            public void run() {

                if (fse != null) {

                    c.fireHyperlinkUpdate(fse);

                } else {

                    try {

                        c.setPage(url);

                    } catch (IOException e) {

                        UIManager.getLookAndFeel().provideErrorFeedback(c);

                    }

                }

            }

        });

    }