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/*******************************************************************************
 * ============LICENSE_START========================================================================
 * ONAP : ccsdk feature sdnr wt
 * =================================================================================================
 * Copyright (C) 2019 highstreet technologies GmbH Intellectual Property. All rights reserved.
 * =================================================================================================
 * 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.
 * ============LICENSE_END==========================================================================
 ******************************************************************************/
package org.onap.ccsdk.features.sdnr.wt.devicemanager.base.netconf.util;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.TimeZone;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.yang.types.rev130715.DateAndTime;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Function is handling the NETCONF and the format used by database and restconf communication.
 *
 * Input supported for the formats used in NETCONF messages:
 *
 * Format1 ISO 8601 2017-01-18T11:44:49.482-05:00
 *
 * Format2 NETCONF - pattern from ietf-yang-types "2013-07-15" Pattern:
 * "\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}(\.\d+)?(Z|[\+\-](\d{2}):(\d{2}))"
 *
 * Format3 NETCONF DateAndTime CoreModel-CoreFoundationModule-TypeDefinitions vom
 * 2016-07-01 Example1: 20170118114449.1Z Example2: 20170118114449.1-0500 Pattern:
 * "\d{4}\d{2}\d{2}\d{2}\d{2}\d{2}.\d+?(Z|[\+\-](\d{2})(\d{2}))" typedef DateAndTime { description
 * "This primitive type defines the date and time according to the following structure:
 * 'yyyyMMddhhmmss.s[Z|{+|-}HHMm]' where: yyyy '0000'..'9999' year MM '01'..'12' month dd '01'..'31'
 * day hh '00'..'23' hour mm '00'..'59' minute ss '00'..'59' second s '.0'..'.9' tenth of second
 * (set to '.0' if EMS or NE cannot support this granularity) Z 'Z' indicates UTC (rather than local
 * time) {+|-} '+' or '-' delta from UTC HH '00'..'23' time zone difference in hours Mm '00'..'59'
 * time zone difference in minutes."; type string; } Format4 E/// specific Example1:
 * 2017-01-23T13:32:38-05:00 Example2: 2017-01-23T13:32-05:00
 *
 * Input formats netconfTime as String according the formats given above
 *
 * Return format is String in ISO8601 Format for database and presentation.
 *
 * Example formats:
 *    1) ISO8601. Example 2017-01-18T11:44:49.482-05:00
 *    2) Microwave ONF. Examples 20170118114449.1Z, 20170118114449.1-0500
 *    3.1) Ericson. Example: 2017-01-23T13:32:38-05:00
 *    3.2) Ericson. Example: 2017-01-23T13:32-05:00
 *          Always 10 Groups,
 *          1:Year 2:Month 3:day 4:Hour 5:minute 6:optional sec 7:optional ms 8:optional Z or 9:offset
 *           signedhour 10:min
 *
 * Template:
 *     private static final NetconfTimeStamp NETCONFTIME_CONVERTER = NetconfTimeStamp.getConverter();
 */

public class NetconfTimeStamp {
    private static final Logger LOG = LoggerFactory.getLogger(NetconfTimeStamp.class);

    private static final NetconfTimeStamp CONVERTER = new NetconfTimeStamp();

    private final SimpleDateFormat dateFormatResult = init("yyyy-MM-dd'T'HH:mm:ss.S'Z'", TimeZone.getTimeZone("GMT"));
    private final SimpleDateFormat dateFormatConvert = init("yyyy-MM-dd HH:mm:ss.S", TimeZone.getTimeZone("GMT"));
    private static int MILLISECONDSDIGITS = 3; // Digits of milliseconds in dateFormatResult
    private static String MILLISECONDZEROS = "000"; // String with zeros for milliseconds in dateFormatResult
    private static final Pattern dateNetconfPatter = Pattern.compile(
        "(\\d{4})-?(\\d{2})-?(\\d{2})T?(\\d{2}):?(\\d{2})(?:(?::?)(\\d{2}))?(?:.(\\d+))?(?:(Z)|([+-]\\d{2}):?(\\d{2}))");

    /*
     * ------------------------------------ Public function
     */

    /**
     * Use static access
     */
    private NetconfTimeStamp() {
    }

    /**
     * Use this function to get the converter
     * @return global converter
     */
    public static NetconfTimeStamp getConverter() {
        return CONVERTER;
    }

    /**
     * Get actual timestamp as NETCONF specific type NETCONF/YANG 1.0 Format
     *
     * @return String with Date in NETCONF/YANG Format Version 1.0.
     */
    public String getTimeStampAsNetconfString() {
        return this.getRightFormattedDate(new Date().getTime());
    }

    /**
     * Get actual timestamp as NETCONF specific type NETCONF/YANG 1.0 Format

     * @return String with Date in NETCONF/YANG Format Version 1.0.
     */
    public String getTimeStampAsNetconfString(Date date) {
        return getRightFormattedDate(date.getTime());
    }
    /**
     * Get actual timestamp as NETCONF specific type NETCONF/YANG 1.0 Format in GMT
     *
     * @return DateAndTime Type 1.0. Date in NETCONF/YANG Format Version 1.0.
     */
    public DateAndTime getTimeStamp() {
        return DateAndTime.getDefaultInstance(getTimeStampAsNetconfString());
    }

    /**
     * Get time from date as NETCONF specific type NETCONF/YANG 1.0 Format in GMT
     * @param date specifying the date and time
     * @return DateAndTime Type 1.0. Date in NETCONF/YANG Format Version 1.0.
     */
    public DateAndTime getTimeStamp(Date date) {
        return DateAndTime.getDefaultInstance(getTimeStampAsNetconfString(date));
    }


    /**
     * Return the String with a NETCONF time converted to long
     *
     * @param netconfTime as String according the formats given above
     * @return Epoch milliseconds
     * @throws IllegalArgumentException In case of no compliant time format definition for the string
     * @throws ParseException Time parsing failed
     */
    public long getTimeStampFromNetconfAsMilliseconds(String netconfTime)
            throws IllegalArgumentException, ParseException {
        Matcher m = dateNetconfPatter.matcher(netconfTime);
        // According to spezified matches there have to be 10 parameter
        if (m.matches() && m.groupCount() == 10) {
            // Convert now
            long utcMillis = dateFormatConvert.parse(getTimeAsNormalizedString(m, m.group(6), m.group(7))).getTime()
                    - getTimezoneOffsetMilliseconds(m.group(9), m.group(10));
            return utcMillis;
        } else {
            throw new IllegalArgumentException("No pattern for NETCONF data string: " + netconfTime);
        }
    }

    /**
     * Deliver String result.
     *
     * @param netconfTime as String according the formats given above
     * @return If successful: String in ISO8601 Format for database and presentation. If "wrong formed
     *         input" the Input string with the prefix "Mailformed date" is delivered back.
     */
    public String getTimeStampFromNetconf(String netconfTime) {
        Matcher m = dateNetconfPatter.matcher(netconfTime);
        // According to spezified matches there have to be 10 parameter
        if (m.matches() && m.groupCount() == 10) {
            // Convert now
            try {
                long utcMillis = dateFormatConvert.parse(getTimeAsNormalizedString(m, m.group(6), m.group(7))).getTime()
                        - getTimezoneOffsetMilliseconds(m.group(9), m.group(10));
                return getRightFormattedDate(utcMillis);
            } catch (ParseException e) {
                LOG.info(e.getMessage());
            } catch (IllegalArgumentException e) {
                LOG.info(e.getMessage());
            }
        }
        LOG.debug("No pattern for NETCONF data string: {}", netconfTime);
        return "Malformed date: " + netconfTime; // Error handling
    }

    /*-------------------------------------------
     * Private and static functions
     */
    /**
     * Convert timeZone parameter in format [+-]/d/d:/d/d into milliseconds
     *
     * @param m Index 9 with "+/-" and hour string or null for UTZ, Index 10 with minutes
     * @return long milliseconds of TimeZoneOffset
     * @throws IllegalArgumentException If parameters are wrong
     */
    private static long getTimezoneOffsetMilliseconds(String timeZoneHour, String timeZoneMinute)
            throws IllegalArgumentException {
        // -- Calculate timezone specific offset
        long timeZoneOffsetMilliseconds = 0;
        if (timeZoneHour != null) {
            // Time zone offset in hours and minutes
            int tzHour = 0;
            int tzMinutes = 0;
            tzHour = Integer.valueOf(timeZoneHour);
            if (timeZoneMinute != null) {
                tzMinutes = Integer.valueOf(timeZoneMinute);
            } else {
                throw new IllegalArgumentException("Problem in Netconf Time format timeZone minutes parameter.");
            }
            timeZoneOffsetMilliseconds = (tzHour * 60 + (tzHour > 0 ? tzMinutes : -tzMinutes)) * 60000L;
        }
        return timeZoneOffsetMilliseconds;
    }

    /**
     * Convert parameters to String with year .. minutes and optional Seconds and .. milliseconds
     *
     * @param m Matcher with parsed date
     * @param secString Seconds as String or null
     * @param msString Milliseconds as String or null
     * @return Normalized time string
     */
    private static String getTimeAsNormalizedString(Matcher m, String secString, String msString) {
        // -- Create time as normalized string
        StringBuffer sb = new StringBuffer();
        sb.append(m.group(1)); // year
        sb.append('-');
        sb.append(m.group(2)); // Month
        sb.append('-');
        sb.append(m.group(3)); // Day
        sb.append(' ');
        sb.append(m.group(4)); // Hour 0-23
        sb.append(':');
        sb.append(m.group(5)); // Minute
        sb.append(':');
        sb.append(secString != null ? secString : "00"); // Seconds (optional)
        sb.append('.');
        if (msString == null) { // Milliseconds optional
            sb.append(MILLISECONDZEROS);
        } else if (msString.length() <= MILLISECONDSDIGITS) {
            sb.append(msString); // Millisecond
            sb.append(MILLISECONDZEROS.substring(0, MILLISECONDSDIGITS - msString.length()));
        } else {
            sb.append(msString.substring(0, MILLISECONDSDIGITS)); // Only first Three
        }
        return sb.toString();
    }

    /**
     * Deliver format in a way that milliseconds are correct.
     *
     * @param dateMillis Date as milliseconds in Java definition
     * @return String
     */
    private String getRightFormattedDate(long dateMillis) {
        long tenthOfSeconds = dateMillis % 1000 / 100L; // Extract 100 milliseconds
        long base = dateMillis / 1000L * 1000L; // Cut milliseconds to 000
        Date newDate = new Date(base + tenthOfSeconds);
        return dateFormatResult.format(newDate);
    }

    /**
     * Static initialization
     */
    private static SimpleDateFormat init(String format, TimeZone zone) {
        if (zone == null) {
            throw new ExceptionInInitializerError();
        } else {
            SimpleDateFormat dateFormat;
            dateFormat = new SimpleDateFormat(format);
            dateFormat.setTimeZone(zone);
            return dateFormat;
        }
    }



}