/**
 *    Copyright 2009-2017 the original author or authors.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */
package com.googlecode.htmlcompressor.compressor;

import java.io.IOException;
import java.io.StringReader;
import java.io.StringWriter;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.yahoo.platform.yui.compressor.CssCompressor;

/**
 * Basic CSS compressor implementation using <a href="http://developer.yahoo.com/yui/compressor/">Yahoo YUI
 * Compressor</a> that could be used by {@link HtmlCompressor} for inline CSS compression.
 * 
 * @author <a href="mailto:serg472@gmail.com">Sergiy Kovalchuk</a>
 * 
 * @see HtmlCompressor#setCssCompressor(Compressor)
 * @see <a href="http://developer.yahoo.com/yui/compressor/">Yahoo YUI Compressor</a>
 */
public class YuiCssCompressor implements Compressor {

    /** The Constant Logger. */
    private static final Logger logger    = LoggerFactory.getLogger(YuiCssCompressor.class);

    /** The line break. */
    private int                 lineBreak = -1;

    @Override
    public String compress(String source) {
        StringWriter result = new StringWriter();

        try {
            CssCompressor compressor = new CssCompressor(new StringReader(source));
            compressor.compress(result, lineBreak);
        } catch (IOException e) {
            result.write(source);
            logger.error("", e);
        }

        return result.toString();
    }

    /**
     * Returns number of symbols per line Yahoo YUI Compressor will use during CSS compression. This corresponds to
     * <code>--line-break</code> command line option.
     * 
     * @return <code>line-break</code> parameter value used for CSS compression.
     * 
     * @see <a href="http://developer.yahoo.com/yui/compressor/">Yahoo YUI Compressor</a>
     */
    public int getLineBreak() {
        return lineBreak;
    }

    /**
     * Tells Yahoo YUI Compressor to break lines after the specified number of symbols during CSS compression. This
     * corresponds to <code>--line-break</code> command line option. This option has effect only if CSS compression is
     * enabled. Default is <code>-1</code> to disable line breaks.
     * 
     * @param lineBreak
     *            set number of symbols per line
     * 
     * @see <a href="http://developer.yahoo.com/yui/compressor/">Yahoo YUI Compressor</a>
     */
    public void setLineBreak(int lineBreak) {
        this.lineBreak = lineBreak;
    }

}
