var isMSIE = /*@cc_on!@*/false;

function bodyOnLoad() {

  showSystemMessage();

}

function bodyOnUnload() {}

/* return selected radiobutton */
function getSelectedRadio(id) {
  var r = document.getElementsByName(id);
  for (var i = 0; i < r.length; i++) { if (r[i].checked) { return r[i].value }}
  return false;
}

// show system message in the middle of the screen

function showSystemMessage() {
  var msg = document.getElementById('systemMessage');
  if (msg) {
    // make half-visible standard content
    var substrate = document.getElementById('bodySubstrate');
    if (substrate) {
        substrate.style.display = 'block';
    }
  }

  if (isMSIE) {
    // stupid IE, it needs time to understand that content has been scrolled
    window.setTimeout( centerSystemMessage, 400);
  }
  else {
    // just do it
    centerSystemMessage();
  }
}

function centerSystemMessage() {
  var msg = document.getElementById('systemMessage');
  if (msg) {
    var viewport = _cas.window.getViewPort();

    var margin = 4; // same value as in style.css
    var border = 1; // same value as in see style.css
    var padding = 4; // same value as in see style.css

    var screenWidth = parseInt(viewport.x2 - viewport.x1);
    var msgWidth = screenWidth / 2;

    msg.style.top = viewport.y1 + parseInt(viewport.y2 - viewport.y1 - msg.offsetHeight ) / 2 + 'px';
    msg.style.left = screenWidth / 4 - margin - border - padding + 'px';

    msg.style.width = msgWidth + 'px';
    msg.style.display = 'block';

    var closeButton = document.getElementById('messages_close_button');
    if (closeButton) {
      closeButton.focus();
    }
    

  }
}


function hideSystemMessage() {
  var msg = document.getElementById('systemMessage');
  if (msg) {
    msg.style.display = 'none';
  }

    // make half-visible standard content
    var substrate = document.getElementById('bodySubstrate');
    if (substrate) {
        substrate.style.display = 'none';
    }
}



/* returns selected checkbox IDs */
function getSelectedItems(id) {
  ids = new Array();
  p = document.getElementsByName(id);
  for (i = 0; i < p.length; i++) { if (p[i].checked) { ids[ids.length] = p[i].value }};
  if (ids.length == 0) {
    alert('Empty selection. Please select at least one participant');
    return false;
  }
  return ids.join(',');
}

/* inverts the selection  */
function invertSelection(id) {
  var c = document.getElementsByName(id);
  for ( var i = 0; i < c.length; i++ ) { 
    c[i].checked = !c[i].checked;
  }
}

/* change the selection  */
function setSelection(id, checked) {
  var c = document.getElementsByName(id);
  for ( var i = 0; i < c.length; i++ ) { 
    c[i].checked = checked;
  }
}
/* resizes scrollable tables to fit the screen optimally */
function resizeTables() {

  if (isMSIE)
    return;

  var table = document.getElementById('dataTable');
  if (!table) {
    return;
  } 

  var currentTableHeight = table.scrollHeight;
  var otherHeight = document.body.scrollHeight - currentTableHeight;
  var desiredHeight = getPageHeight() - otherHeight - 60;
  if (desiredHeight < 250)
    desiredHeight = 250

  if (getPageHeight() - otherHeight < currentTableHeight) {
    //do not fit, change size of table contents
    table.style.height = desiredHeight + 'px';
 
    //tbody height must be = desiredHeight = thead.height
    if (table.getElementsByTagName('thead') && table.getElementsByTagName('tbody')){
      thead = table.getElementsByTagName('thead')[0];
      tbody = table.getElementsByTagName('tbody')[0];
      tbody.style.height = desiredHeight - thead.scrollHeight + 'px';
    }
  }
}

/* redirects browther to an URL */
function gotoURL(url, target) {
  var s = url.indexOf('?') < 0 ? '?' : '&';
  var location = url + s + 'sid=' + parseInt(Math.random() * 1000000);
  if (typeof(target) == 'undefined') {
    window.location.href = location;
  } else {
    var newWindow = window.open(location, target);
    newWindow.focus();
  }
}



/* returns client page width and height */
function getPageWidth() {
  var W;
  if( typeof( window.innerWidth ) == 'number' ) {
  W = window.innerWidth;
  } else if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
    W = document.documentElement.clientWidth;
  } else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
    W = document.body.clientWidth;
  }
  return W
}

function getPageHeight() {
  var H;
  if( typeof( window.innerWidth ) == 'number' ) {
  H = window.innerHeight;
  } else if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
    H = document.documentElement.clientHeight;
  } else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
    H = document.body.clientHeight;
  }
  return H
}

function getDocHeight() {
  var D = document;
  return Math.max(
    Math.max(D.body.scrollHeight, D.documentElement.scrollHeight),
    Math.max(D.body.offsetHeight, D.documentElement.offsetHeight),
    Math.max(D.body.clientHeight, D.documentElement.clientHeight)
  );
}