function setWhite(acl)
{
    acl == 'custom' ? $('#whitelistBox').removeClass('hidden') : $('#whitelistBox').addClass('hidden');
}

function switchStatus(projectID, status)
{
  if(status) location.href = createLink('project', 'task', 'project=' + projectID + '&type=' + status);
}

function switchGroup(projectID, groupBy)
{
    link = createLink('project', 'groupTask', 'project=' + projectID + '&groupBy=' + groupBy);
    location.href=link;
}

/**
 * Convert a date string like 2011-11-11 to date object in js.
 * 
 * @param  string $date 
 * @access public
 * @return date
 */
function convertStringToDate(dateString)
{
    dateString = dateString.split('-');
    dateString = dateString[1] + '/' + dateString[2] + '/' + dateString[0];
    
    return Date.parse(dateString);
}

/**
 * Compute delta of two days.
 * 
 * @param  string $date1 
 * @param  string $date1 
 * @access public
 * @return int
 */
function computeDaysDelta(date1, date2)
{
    date1 = convertStringToDate(date1);
    date2 = convertStringToDate(date2);
    delta = (date2 - date1) / (1000 * 60 * 60 * 24) + 1;

    weekEnds = 0;
    for(i = 0; i < delta; i++)
    {
        if(date1.getDay() == 0 || date1.getDay() == 6) weekEnds ++;
        date1 = date1.valueOf();
        date1 += 1000 * 60 * 60 * 24;
        date1 = new Date(date1);
    }
    return delta - weekEnds; 
}

/**
 * Compute work days.
 * 
 * @access public
 * @return void
 */
function computeWorkDays()
{
    beginDate = $('#begin').val();
    endDate   = $('#end').val();
    if(beginDate && endDate) 
    {
      $('#days').val(computeDaysDelta(beginDate, endDate));
    }
    else if($('input[checked="true"]').val()) 
    {
      computeEndDate();
    }
}

/**
 * Compute the end date for project.
 * 
 * @param  int    $delta 
 * @access public
 * @return void
 */
function computeEndDate(delta)
{
    beginDate = $('#begin').val();
    if(!beginDate) return;

    endDate = convertStringToDate(beginDate).addDays(parseInt(delta));
    endDate = endDate.toString('yyyy-M-dd');
    $('#end').val(endDate);
    computeWorkDays();
}

/* Auto compute the work days. */
$(function() 
{
    $(".date").bind('dateSelected', function()
    {
        computeWorkDays();
    })
});