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/*
 * $Id: StringValues.java 3927 2011-02-22 16:34:11Z kleopatra $
 *
 * Copyright 2008 Sun Microsystems, Inc., 4150 Network Circle,
 * Santa Clara, California 95054, U.S.A. All rights reserved.
 *
 * This library 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.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
package org.jdesktop.swingx.renderer;

import org.jdesktop.swingx.util.Contract;

import javax.swing.filechooser.FileSystemView;
import javax.swing.plaf.UIResource;
import java.io.File;
import java.text.DateFormat;
import java.text.NumberFormat;
import java.util.Locale;

/**
 * A collection of common {@code StringValue} implementations.
 *
 * @author Karl George Schaefer
 * @author Jeanette Winzenburg
 */
public final class StringValues {

    /**
     * A {@code StringValue} that always presents an empty string.
     */
    public static final StringValue EMPTY = value -> "";

    /**
     * A {@code StringValue} that presents a {@link Object#toString() toString}
     * value for the given object. If the value passed is {@code null}, this has
     * the same effect as {@link StringValues#EMPTY}.
     */
    public static final StringValue TO_STRING = value -> value != null ? value.toString() : EMPTY.getString(value);

    /**
     * A {@code StringValue} that presents the current L&F display name for a
     * given file. If the value passed to {@code FILE_NAME} is not a
     * {@link File}, this has the same effect as {@link StringValues#TO_STRING}.
     */
    public static final StringValue FILE_NAME = value -> {
        if (value instanceof File) {
            FileSystemView fsv = FileSystemView.getFileSystemView();

            return fsv.getSystemDisplayName((File) value);
        }

        return TO_STRING.getString(value);
    };

    /**
     * A {@code StringValue} that presents the current L&F type name for a
     * given file. If the value passed to {@code FILE_TYPE} is not a
     * {@link File}, this has the same effect as {@link StringValues#TO_STRING}.
     */
    public static final StringValue FILE_TYPE = value -> {
        if (value instanceof File) {
            FileSystemView fsv = FileSystemView.getFileSystemView();

            return fsv.getSystemTypeDescription((File) value);
        }

        return TO_STRING.getString(value);
    };

    /**
     * keep track of default locale.
     */
    private static Locale defaultLocale;

    /**
     * Returns a boolean to indicate if the default Locale has changed.
     * Updates internal state to keep track of the default Locale.
     *
     * @return true if the default Locale has changed.
     */
    private static boolean localeChanged() {
        boolean changed = !Locale.getDefault().equals(defaultLocale);
        if (changed) {
            defaultLocale = Locale.getDefault();
        }
        return changed;
    }

    /**
     * Default converter for Date types. Uses the default format
     * as returned from DateFormat.
     */
    public static final FormatStringValue DATE_TO_STRING = new FormatStringValue() {

        /**
         * {@inheritDoc}
         */
        @Override
        public String getString(Object value) {
            if (format == null || localeChanged()) {
                format = DateFormat.getDateInstance();
            }
            return super.getString(value);
        }
    };

    /**
     * Default converter for Number types. Uses the default format
     * as returned from NumberFormat.
     */
    public static final FormatStringValue NUMBER_TO_STRING = new FormatStringValue() {

        /**
         * {@inheritDoc}
         */
        @Override
        public String getString(Object value) {
            if (format == null || localeChanged()) {
                format = NumberFormat.getNumberInstance();
            }
            return super.getString(value);
        }
    };

    public static final StringValue TO_STRING_UI = new StringValueUIResource(TO_STRING);
    public static final StringValue EMPTY_UI = new StringValueUIResource(EMPTY);

    /**
     * StringValue wrapper of type UIResource to tag LAF installed converters.
     *
     * @author Jeanette Winzenburg, Berlin
     */
    public static class StringValueUIResource implements StringValue, UIResource {

        private final StringValue delegate;

        public StringValueUIResource(StringValue toString) {
            Contract.asNotNull(toString, "delegate StringValue must not be null");
            this.delegate = toString;
        }

        @Override
        public String getString(Object value) {
            return delegate.getString(value);
        }
    }

    private StringValues() {
        // does nothing
    }
}