/*
 * Copyright (c) 2005-2011 Grameen Foundation USA
 * 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.
 *
 * See also http://www.apache.org/licenses/LICENSE-2.0.html for an
 * explanation of the license and how it is applied.
 */

package org.mifos.framework.util;

import junit.framework.Assert;

import org.joda.time.DateMidnight;
import org.joda.time.DateTime;
import org.joda.time.Duration;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

public class DateTimeServiceTest {

    private static final int ONE_SECOND = 1000;

    @Before
    public void setUp() {
        new DateTimeService().resetToCurrentSystemDateTime();
    }

    @After
    public void tearDown() {
        new DateTimeService().resetToCurrentSystemDateTime();
    }

    @Test
    public void testSetCurrentTimeFixed() throws InterruptedException {
        DateTime dateTime = new DateTime(2007,1,2,0,0,0,0);
        DateTimeService dateTimeService = new DateTimeService();
        dateTimeService.setCurrentDateTimeFixed(dateTime);
        // do something to make sure that a measurable about of time passes
        Thread.sleep(10);
        DateTime newDateTime = dateTimeService.getCurrentDateTime();
        Assert.assertEquals("After setting a frozen date time, time should not advance",dateTime, newDateTime);
    }

    @Test
    public void testGetCurrentJavaDateTime() {
        DateTimeService dateTimeService = new DateTimeService();
        DateTime systemDateTime = new DateTime(System.currentTimeMillis());
        DateTime timeServiceDateTime = new DateTime(dateTimeService.getCurrentJavaDateTime());
        Duration duration = new Duration(systemDateTime,timeServiceDateTime);
        // the dates returned should be equal or very close
        Assert.assertTrue("Expected the java date time returned by DateTimeService to be equal or close to the actual system time", duration.getMillis() < ONE_SECOND);
    }

    @Test
    public void testGetCurrentDateMidnight() {
        DateTimeService dateTimeService = new DateTimeService();
        DateTime dateTime = dateTimeService.getCurrentDateTime();
        dateTimeService.setCurrentDateTimeFixed(dateTime);
        DateMidnight dateMidnight = dateTimeService.getCurrentDateMidnight();
        Assert.assertEquals("DateMidnight portions should be equal",
                dateTime.toDateMidnight(), dateMidnight);
    }

    @Test
    public void testSetCurrentTime() throws InterruptedException {
        DateTimeService dateTimeService = new DateTimeService();
        DateTime someDateTime = new DateTime(2008,1,1,12,0,0,0);
        dateTimeService.setCurrentDateTime(someDateTime);
        // The date that comes back should be as set
        Assert.assertEquals(someDateTime.toLocalDate(), dateTimeService.getCurrentDateTime().toLocalDate());
        // do something to make sure that a measurable about of time passes
        Thread.sleep(100);
        // Some time should have passed since setting the time on the dateTimeService
        Assert.assertTrue("After setting a date, the current time returned by the DateTimeService should continue advancing.",
                dateTimeService.getCurrentDateTime().getMillis() > someDateTime.getMillis());
    }

    @Test
    public void testGetCurrentJavaSqlDate() {
        DateTimeService dateTimeService = new DateTimeService();
        DateTime dateTime = new DateTime(2008,1,1,12,0,0,0);
        dateTimeService.setCurrentDateTimeFixed(dateTime);
        DateTime javaSqlDateTime = new DateTime(dateTimeService.getCurrentJavaSqlDate().getTime());
        Assert.assertEquals("Dates should be equal", dateTime.toLocalDate(), javaSqlDateTime.toLocalDate());
    }

}