/*
 *   Copyright 2011 Brian Rosenberger (Brutex Network)
 *
 *   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 net.brutex.xservices.ws.impl;

import java.math.BigInteger;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.List;
import java.util.TimeZone;

import javax.jws.WebService;
import net.brutex.xservices.types.DateFormatType;
import net.brutex.xservices.types.DateInfoExtendedType;
import net.brutex.xservices.types.DateInfoType;
import net.brutex.xservices.types.DateTimeUnits;
import net.brutex.xservices.types.TimeZoneType;
import net.brutex.xservices.util.BrutexNamespaces;
import net.brutex.xservices.ws.DateService;
import net.brutex.xservices.ws.XServicesFault;

/**
 * @author Brian Rosenberger
 * 
 */
@WebService(targetNamespace = BrutexNamespaces.WS_XSERVICES, endpointInterface = "net.brutex.xservices.ws.DateService", serviceName = DateService.SERVICE_NAME)
public class DateServiceImpl implements DateService {

	private static String ERR_INVALIDFORMAT = "Invalid format pattern.";
	private static String ERR_INVALIDTIMEZONE = "Invalid timezone.";

	public DateInfoType getDate() throws XServicesFault {
		GregorianCalendar c = new GregorianCalendar();
		DateInfoType dateinfo = new DateInfoType(c, TimeZone.getDefault());
		return dateinfo;
	}

	public DateInfoExtendedType getDateExtended() throws XServicesFault {
		GregorianCalendar c = new GregorianCalendar();
		DateInfoExtendedType dateinfo = new DateInfoExtendedType(c,
				TimeZone.getDefault());
		return dateinfo;
	}

	public BigInteger getTimestamp() {
		Date d = new Date();
		long l = d.getTime();
		return new BigInteger(Long.toString(l));
	}

	public BigInteger getTimestamp2() {
		Date d = new Date();
		long l = d.getTime() / 1000;
		return new BigInteger(Long.toString(l));
	}

	public String getInTimezone(Date date, String timezone)
			throws XServicesFault {
		if (!isValidTimezone(timezone))
			throw new XServicesFault(ERR_INVALIDTIMEZONE);
		TimeZone targetzone = TimeZone.getTimeZone(timezone);
		String targetstring = DateFormatType.ISO8601.format(date, null, targetzone);
		return targetstring;
	}

	public String formatDate(Date cal, DateFormatType format)
			throws XServicesFault {
		return format.format(cal, null, null);
	}

	public String formatDateAdvanced(Date cal, String format)
			throws XServicesFault {
		String result = null;
		SimpleDateFormat f = new SimpleDateFormat(format);
		result = f.format(cal);
		return result;
	}

	public Date parseDate(String s, DateFormatType format, String timezone) 
			throws XServicesFault {
		if (timezone == null | timezone.equals(""))
			timezone = TimeZone.getDefault().getID();
		if (!isValidTimezone(timezone))
			throw new XServicesFault(ERR_INVALIDTIMEZONE);
		try {
			return format.parse(s, null, TimeZone.getTimeZone(timezone));
		} catch (ParseException e) {
			throw new XServicesFault(e);
		}
	}

	public GregorianCalendar parseDateAdvanced(String s, String format,
			String timezone) throws XServicesFault {
		SimpleDateFormat f = null;
		Date date = null;
		if (timezone == null | timezone.equals(""))
			timezone = TimeZone.getDefault().getID();
		if (!isValidTimezone(timezone))
			throw new XServicesFault(ERR_INVALIDTIMEZONE);

		try {
			f = new SimpleDateFormat(format);
			date = f.parse(s);
		} catch (IllegalArgumentException e) {
			throw new XServicesFault(ERR_INVALIDFORMAT + e.getMessage());
		} catch (ParseException e) {
			throw new XServicesFault("Cannot parse date: " + e.getMessage());
		}
		GregorianCalendar cal = new GregorianCalendar();
		cal.setTimeZone(TimeZone.getTimeZone(timezone));
		cal.setTime(date);
		return cal;
	}

	public BigInteger dateTimeDiff(Date fromCal, Date toCal)
			throws XServicesFault {
		long diff = toCal.getTime() - fromCal.getTime();
		BigInteger d = new BigInteger(String.valueOf(diff), 10);
		return d;
	}

	public BigInteger dateTimeDiff2(Date fromCal, Date toCal, DateTimeUnits unit)
			throws XServicesFault {
		BigInteger d = dateTimeDiff(fromCal, toCal);
		switch (unit) {
		case SECONDS:
			d = d.divide(new BigInteger("1000"));
			break;
		case MINUTES:
			d = d.divide(new BigInteger("60000"));
			break;
		case HOURS:
			d = d.divide(new BigInteger("3600000"));
			break;
		case DAYS:
			d = d.divide(new BigInteger("86400000"));
			break;
		case YEARS:
			d = d.divide(new BigInteger("31536000000"));
			break;
		}
		return d;
	}

	public GregorianCalendar dateAdd(GregorianCalendar cal, BigInteger value,
			DateTimeUnits unit) throws XServicesFault {
		switch (unit) {
		case SECONDS:
			cal.add(GregorianCalendar.SECOND, value.intValue());
			break;
		case MINUTES:
			cal.add(GregorianCalendar.MINUTE, value.intValue());
			break;
		case HOURS:
			cal.add(GregorianCalendar.HOUR_OF_DAY, value.intValue());
			break;
		case DAYS:
			cal.add(GregorianCalendar.DAY_OF_MONTH, value.intValue());
			break;
		case YEARS:
			cal.add(GregorianCalendar.YEAR, value.intValue());
			break;
		default:
			cal.add(GregorianCalendar.MILLISECOND, value.intValue());
		}
		return cal;
	}

	private boolean isValidTimezone(String id) {
		boolean yes = false;
		for (String s : TimeZone.getAvailableIDs()) {
			if (s.equals(id)) {
				yes = true;
				break;
			}
		}
		return yes;
	}

	public List<TimeZoneType> getTimezones() {
		List<TimeZoneType> output = new ArrayList<TimeZoneType>();
		for (String s : TimeZone.getAvailableIDs()) {
			output.add(new TimeZoneType(TimeZone.getTimeZone(s)));
		}
		return output;
	}
}