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/*
 * Copyright 2000,2005 wingS development team.
 *
 * This file is part of wingS (http://wingsframework.org).
 *
 * wingS is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2.1
 * of the License, or (at your option) any later version.
 *
 * Please see COPYING for the complete licence.
 */
package org.wings.plaf.css;

import org.wings.*;
import org.wings.plaf.Update;
import org.wings.io.Device;

import java.io.IOException;

public class ButtonCG extends AbstractLabelCG implements org.wings.plaf.ButtonCG {

    /**
     * a serializable class is supposed to have this ID.
     */
    private static final long serialVersionUID = -1794530181411426283L;

    @Override
    public void writeInternal(final Device device, final SComponent component)
            throws IOException {
        final SAbstractButton button = (SAbstractButton) component;

        String text = button.getText();
        final SIcon icon = getIcon(button);

        if (icon == null && text == null)
            text = "";
        final String ftext = text;

        if (icon == null) {
            device.print("");
            writeText(device, text, button.isWordWrap());
            device.print("");
        }
        else if (text == null) {
            device.print("");
            writeIcon(device, icon, Utils.isMSIE(component));
            device.print("");
        }
        else {
            new IconTextCompound() {
                @Override
                protected void text(Device d) throws IOException {
                    writeText(d, ftext, button.isWordWrap());
                }

                @Override
                protected void icon(Device d) throws IOException {
                    writeIcon(d, icon, Utils.isMSIE(component));
                }

                @Override
                protected void tableAttributes(Device d) throws IOException {
                    ButtonCG.this.tableAttributes(d, button);
                }
            }.writeCompound(device, component, button.getHorizontalTextPosition(), button.getVerticalTextPosition(), false);
        }
    }

    protected void tableAttributes(Device device, SAbstractButton button) throws IOException {
        Utils.printClickability(device, button, button.getToggleSelectionParameter(), button.isEnabled(), button.getShowAsFormComponent());

        String style = button.getStyle();
        StringBuilder className = new StringBuilder(style != null ? style : "SButton");
        if (button.getShowAsFormComponent())
            className.append("_form");
        if (!button.isEnabled())
            className.append("_disabled");
        if (button.isSelected())
            className.append("_selected");

        button.setStyle(className.toString());
        Utils.writeAllAttributes(device, button);
        button.setStyle(style);

        if (button.isFocusOwner())
            Utils.optAttribute(device, "foc", button.getName());

        Utils.optAttribute(device, "tabindex", button.getFocusTraversalIndex());
        Utils.optAttribute(device, "accesskey", button.getMnemonic());
    }

    /* Retrieve according icon for a button. */
    public static SIcon getIcon(SAbstractButton abstractButton) {
        if (abstractButton.isSelected()) {
            return abstractButton.isEnabled()
                    ? abstractButton.getSelectedIcon()
                    : abstractButton.getDisabledSelectedIcon();
        } else {
            return abstractButton.isEnabled()
                    ? abstractButton.getIcon()
                    : abstractButton.getDisabledIcon();
        }
    }

    @Override
    public Update getTextUpdate(SButton button, String text) {
        return text == null ? null : new TextUpdate(button, text);
    }

    @Override
    public Update getIconUpdate(SButton button, SIcon icon) {
        return icon == null ? null : new IconUpdate(button, icon);
    }

}