/*
 *   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;

import java.math.BigInteger;
import java.util.GregorianCalendar;

import javax.jws.WebMethod;
import javax.jws.WebParam;
import javax.jws.WebService;
import javax.xml.bind.annotation.XmlElement;

import net.brutex.xservices.types.DateFormatType;
import net.brutex.xservices.types.DateTimeUnits;
import net.brutex.xservices.util.BrutexNamespaces;

import org.apache.cxf.annotations.WSDLDocumentation;
import org.apache.cxf.annotations.WSDLDocumentationCollection;

/**
 * Date and time related services.
 * @author Brian Rosenberger
 *
 */
@WebService(targetNamespace = BrutexNamespaces.WS_XSERVICES)
@WSDLDocumentationCollection(
    {
    	@WSDLDocumentation(value = BrutexNamespaces.BRUTEX_COPYRIGHT, placement = WSDLDocumentation.Placement.TOP)
    }
)
public interface DateService {
	
	public static final String SERVICE_NAME = "DateService";
	public static final String OPERATION_GETDATE = "getDate";
	public static final String OPERATION_GETTIMESTAMP = "getTimestamp";
	public static final String OPERATION_GETINTIMEZONE = "getInTimezone";
	public static final String OPERATION_FORMATDATE = "formatDate";
	public static final String OPERATION_FORMATDATEADVANCED = "formatDateAdvanced";	
	public static final String OPERATION_PARSEDATE = "parseDate";
	public static final String OPERATION_PARSEDATEADVANCED = "parseDateAdvanced";
	public static final String OPERATION_DATETIMEDIFF = "dateTimeDiff";
	public static final String OPERATION_DATETIMEDIFF2 = "dateTimeDiff2";
	
	public static final String PARAM_TIMEZONE = "timezone";
	public static final String PARAM_DATETIME = "datetime";
	public static final String PARAM_FORMAT = "format";
	
	/**
	 * Get current date and time.
	 * 
	 * @param timezone Optional timezone. Defaults to server timezone.
	 * @return Current date and time.
	 * @throws XServicesFault 
	 */
	@WebMethod(operationName=OPERATION_GETDATE)
	@WSDLDocumentation(value="Get current date and time.")
	public abstract GregorianCalendar getDate(
			@WebParam(name=PARAM_TIMEZONE) String timezone) throws XServicesFault;
	
	/**
	 * Get milliseconds since 01.01.1970.
	 * 
	 * @return timestamp milliseconds
	 */
	@WebMethod(operationName=OPERATION_GETTIMESTAMP)
	@WSDLDocumentation(value="Get milliseconds since 01.01.1970 (Unix timestap).")
	public abstract BigInteger getTimestamp();
	
	/**
	 * Display a date time with a different time zone. 
	 * Changes representation only (no conversion).
	 * 
	 * @param cal date time.
	 * @param timezone time zone
	 * @return date time
	 * @throws XServicesFault
	 */
	@WebMethod(operationName=OPERATION_GETINTIMEZONE)
	public abstract GregorianCalendar getInTimezone(
			@WebParam(name=PARAM_DATETIME) @XmlElement(required=true) GregorianCalendar cal,
			@WebParam(name=PARAM_TIMEZONE) @XmlElement(required=true) String timezone) throws XServicesFault;
	
	/**
	 * @param cal
	 * @param format
	 * @return formatted date/time string
	 * @throws XServicesFault
	 */
	@WebMethod(operationName=OPERATION_FORMATDATE)
	public abstract String formatDate(
			@WebParam(name=PARAM_DATETIME) @XmlElement(required=true) GregorianCalendar cal,
			@WebParam(name=PARAM_FORMAT) @XmlElement(required=true) DateFormatType format) throws XServicesFault;
	
	@WebMethod(operationName=OPERATION_FORMATDATEADVANCED)
	public abstract String formatDateAdvanced(
			@WebParam(name=PARAM_DATETIME) @XmlElement(required=true) GregorianCalendar cal,
			@WebParam(name=PARAM_FORMAT) @XmlElement(required=true) String format) throws XServicesFault;
	
	@WebMethod(operationName=OPERATION_PARSEDATE)
	public abstract GregorianCalendar parseDate(
			@WebParam(name=PARAM_DATETIME) @XmlElement(required=true) String s,
			@WebParam(name=PARAM_FORMAT) @XmlElement(required=true) DateFormatType format,
			@WebParam(name=PARAM_TIMEZONE) String timezone) throws XServicesFault;
	
	@WebMethod(operationName=OPERATION_PARSEDATEADVANCED)
	public abstract GregorianCalendar parseDateAdvanced(
			@WebParam(name=PARAM_DATETIME) @XmlElement(required=true) String s,
			@WebParam(name=PARAM_FORMAT) @XmlElement(required=true) String format,
			@WebParam(name=PARAM_TIMEZONE) String timezone) throws XServicesFault;
	
	@WebMethod(operationName=OPERATION_DATETIMEDIFF)
	public abstract BigInteger dateTimeDiff(
			@WebParam(name="fromDateTime") @XmlElement(required=true) GregorianCalendar fromCal,
			@WebParam(name="toDateTime") @XmlElement(required=true) GregorianCalendar toCal) throws XServicesFault;
	
	/**
	 * Fully elapsed units between two dates.
	 * 4:15:10-4:15:55 in minutes = 0 and in seconds = 45
	 * 
	 * @param fromCal
	 * @param toCal
	 * @param unit
	 * @return Date/time difference in unit
	 * @throws XServicesFault
	 */
	@WebMethod(operationName=OPERATION_DATETIMEDIFF2)
	@WSDLDocumentation(value="Get elapsed time between to dates.")
	public abstract BigInteger dateTimeDiff2(
			@WebParam(name="fromDateTime") @XmlElement(required=true) GregorianCalendar fromCal,
			@WebParam(name="toDateTime") @XmlElement(required=true) GregorianCalendar toCal,
			@WebParam(name="unit") DateTimeUnits unit) throws XServicesFault;
}