/*
 * Copyright (C) 2021 Christian Pierre MOMON <christian@momon.org>
 * 
 * This file is part of StatoolInfos, simple service statistics tool.
 * 
 * StatoolInfos is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 * 
 * StatoolInfos 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 Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with StatoolInfos.  If not, see <http://www.gnu.org/licenses/>.
 */
package fr.devinsy.statoolinfos.metrics.http;

import java.io.File;
import java.io.IOException;

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

import fr.devinsy.statoolinfos.util.LineIterator;

/**
 * The Class HttpLogIterator.
 */
public class HttpLogIterator
{
    private static Logger logger = LoggerFactory.getLogger(HttpLogIterator.class);

    public static final String DEFAULT_CHARSET_NAME = "UTF-8";

    private long errorCount;
    private LineIterator iterator;

    /**
     * Instantiates a new http log iterator.
     *
     * @param source
     *            the source
     * @throws IOException
     *             Signals that an I/O exception has occurred.
     */
    public HttpLogIterator(final File source) throws IOException
    {
        this.errorCount = 0;
        this.iterator = new LineIterator(source);
    }

    /**
     * Close.
     */
    public void close()
    {
        this.iterator.close();
    }

    /**
     * Gets the error count.
     *
     * @return the error count
     */
    public long getErrorCount()
    {
        return this.errorCount;
    }

    /**
     * Checks for next.
     *
     * @return true, if successful
     * @throws IOException
     */
    public boolean hasNext() throws IOException
    {
        boolean result;

        result = this.iterator.hasNext();

        //
        return result;
    }

    /**
     * Next.
     *
     * @return the http log
     * @throws IOException
     */
    public HttpLog next() throws IOException
    {
        HttpLog result;

        try
        {
            String line = this.iterator.next();
            result = HttpAccessLogAnalyzer.parseNginxCombinedLog(line);
        }
        catch (Exception exception)
        {
            exception.printStackTrace();
            this.errorCount += 1;
            if (this.iterator.hasNext())
            {
                result = next();
            }
            else
            {
                result = null;
            }
        }

        //
        return result;
    }
}