// Copyright 2007, Google Inc.
//
// Redistribution and use in source and binary forms, with or without 
// modification, are permitted provided that the following conditions are met:
//
//  1. Redistributions of source code must retain the above copyright notice, 
//     this list of conditions and the following disclaimer.
//  2. Redistributions in binary form must reproduce the above copyright notice,
//     this list of conditions and the following disclaimer in the documentation
//     and/or other materials provided with the distribution.
//  3. Neither the name of Google Inc. nor the names of its contributors may be
//     used to endorse or promote products derived from this software without
//     specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
// EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
// OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 
// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// On some WinCE devices, IE Mobile uses 'unknown' rather than 'undefined'. If
// an element has type 'unknown', we can not pass it to a function, so we must
// pass its type instead.
function isDefined(type) {
  return (type != 'undefined' && type != 'unknown');
}

function childNodes(element) {
  if (isDefined(typeof element.childNodes)) {
    return element.childNodes;
  } else if (isDefined(typeof element.children)) {
    return element.children;
  }
}

function getElementById(element_name) {
  if (isDefined(typeof document.getElementById)) {
    return document.getElementById(element_name);
  } else if(typeof isDefined(document.all)) {
    return document.all[element_name];
  }
}

function setTextContent(elem, content) {
  if (isDefined(typeof elem.innerText)) {
    elem.innerText = content; 
  } else if (isDefined(typeof elem.textContent)) {
    elem.textContent = content;
  }
}

function setupSample() {
  // Make sure we have Gears. If not, tell the user.
  if (!window.google || !google.gears) {
    if (confirm("WhatsGood requires Google Gears to be installed. Install now?")) {
      // Use an absolute URL to allow this to work when run from a local file.
      location.href = "http://code.google.com/apis/gears/install.html";
      return;
    }
  }

}

function checkProtocol() {
  if (location.protocol.indexOf('http') != 0) {
    setError('This sample must be hosted on an HTTP server');
    return false;
  } else {
    return true;
  }
}

function addStatus(message, opt_class) {
  var elm = getElementById('warning');
  var id = 'statusEntry' + (childNodes(elm).length + 1);
  if (!elm) return;
  if (opt_class) {
    elm.innerHTML += '<span id="' + id + '" class="' + opt_class + '"></span>';
  } else {
    elm.innerHTML += '<span id="' + id + '"></span>';
  }
  elm.innerHTML += '<br>';
  setTextContent(getElementById(id), message);
}

function clearStatus() {
  var elm = getElementById('status');
  elm.innerHTML = '';
}

function setError(s) {
  clearStatus();
  addStatus(s, 'error');
}

//setupSample();