/**
 * The contents of this file are subject to the license and copyright
 * detailed in the LICENSE and NOTICE files at the root of the source
 * tree and available online at
 *
 * http://www.dspace.org/license/
 */

package org.dspace.core;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Encapsulate access to the news texts.
 *
 * @author mhwood
 */
public class NewsManager
{
    private static final Logger log = LoggerFactory.getLogger(NewsManager.class);

    /** Not instantiable. */
    private NewsManager() {}

    /**
     * Reads news from a text file.
     *
     * @param newsFile
     *        name of the news file to read in, relative to the news file path.
     */
    public static String readNewsFile(String newsFile)
    {
        String fileName = getNewsFilePath();

        fileName += newsFile;

        StringBuilder text = new StringBuilder();

        try
        {
            // retrieve existing news from file
            FileInputStream fir = new FileInputStream(fileName);
            InputStreamReader ir = new InputStreamReader(fir, "UTF-8");
            BufferedReader br = new BufferedReader(ir);

            String lineIn;

            while ((lineIn = br.readLine()) != null)
            {
                text.append(lineIn);
            }

            br.close();
            ir.close();
            fir.close();
        }
        catch (IOException e)
        {
            log.warn("news_read: " + e.getLocalizedMessage());
        }

        return text.toString();
    }

    /**
     * Writes news to a text file.
     *
     * @param newsFile
     *        name of the news file to read in, relative to the news file path.
     * @param news
     *            the text to be written to the file.
     */
    public static String writeNewsFile(String newsFile, String news)
    {
        String fileName = getNewsFilePath();

        fileName += newsFile;

        try
        {
            // write the news out to the appropriate file
            FileOutputStream fos = new FileOutputStream(fileName);
            OutputStreamWriter osr = new OutputStreamWriter(fos, "UTF-8");
            PrintWriter out = new PrintWriter(osr);
            out.print(news);
            out.close();
        }
        catch (IOException e)
        {
            log.warn("news_write: " + e.getLocalizedMessage());
        }

        return news;
    }

    /**
     * Get the path for the news files.
     *
     */
    public static String getNewsFilePath()
    {
        String filePath = ConfigurationManager.getProperty("dspace.dir")
                + File.separator + "config" + File.separator;

        return filePath;
    }
}