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/*******************************************************************************
 * Copyright (c) quickfixengine.org  All rights reserved.
 *
 * This file is part of the QuickFIX FIX Engine
 *
 * This file may be distributed under the terms of the quickfixengine.org
 * license as defined by quickfixengine.org and appearing in the file
 * LICENSE included in the packaging of this file.
 *
 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING
 * THE WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE.
 *
 * See http://www.quickfixengine.org/LICENSE for licensing information.
 *
 * Contact [email protected] if any conditions of this licensing
 * are not clear to you.
 ******************************************************************************/

package quickfix.field.converter;

import quickfix.FieldConvertError;

import java.text.DateFormat;
import java.text.ParseException;
import java.util.Date;

/**
 * Convert between a time and a String.
 */
public class UtcTimeOnlyConverter extends AbstractDateTimeConverter {

    static final int LENGTH_INCL_SECONDS    = 8;
    static final int LENGTH_INCL_MILLIS     = 12;
    static final int LENGTH_INCL_MICROS     = 15;
    static final int LENGTH_INCL_NANOS      = 18;
    static final int LENGTH_INCL_PICOS      = 21;

    // SimpleDateFormats are not thread safe. A thread local is being
    // used to maintain high concurrency among multiple session threads
    private static final ThreadLocal UTC_TIME_CONVERTER = new ThreadLocal<>();
    private final DateFormat utcTimeFormat = createDateFormat("HH:mm:ss");
    private final DateFormat utcTimeFormatMillis = createDateFormat("HH:mm:ss.SSS");

    /**
     * Convert a time (represented as a Date) to a String (HH:MM:SS or HH:MM:SS.SSS)
     *
     * @param d the date with the time to convert
     * @param includeMilliseconds controls whether milliseconds are included in the result
     * @return a String representing the time.
     */
    public static String convert(Date d, boolean includeMilliseconds) {
        return getFormatter(includeMilliseconds).format(d);
    }

    private static DateFormat getFormatter(boolean includeMillis) {
        UtcTimeOnlyConverter converter = UTC_TIME_CONVERTER.get();
        if (converter == null) {
            converter = new UtcTimeOnlyConverter();
            UTC_TIME_CONVERTER.set(converter);
        }
        return includeMillis ? converter.utcTimeFormatMillis : converter.utcTimeFormat;
    }

    /**
     * Convert between a String and a time
     *
     * @param value the string to parse
     * @return a date object representing the time
     * @throws FieldConvertError raised for invalid time string
     */
    public static Date convert(String value) throws FieldConvertError {
        Date d = null;
        if (value.length() != LENGTH_INCL_SECONDS && value.length() != LENGTH_INCL_MILLIS && value.length() != LENGTH_INCL_MICROS && value.length() != LENGTH_INCL_NANOS && value.length() != LENGTH_INCL_PICOS) {
            throwFieldConvertError(value, "time");
        }
        try {
            final boolean includeMillis = (value.length() >= LENGTH_INCL_MILLIS);
            d = getFormatter(includeMillis).parse(includeMillis ? value.substring(0, LENGTH_INCL_MILLIS) : value);
        } catch (ParseException e) {
            throwFieldConvertError(value, "time");
        }
        return d;
    }

}