let reference = 0;
let order     = true;
let handle;

function showSystemInformation()
{
  return new Promise((resolve, reject) =>
    fetch('/status/system')
    .then((response) => response.json())
    .then((data) =>
    {
      reference = data.reference;
      order     = data.order == 'LittleEndian';
      document.getElementById('version').innerHTML = data.version + ' &lt;<b>ID ' + data.instance + '</b>&gt;';
      document.getElementById('system').innerHTML = data.system;
      resolve();
    }));
}

function updateContextList()
{
  fetch('/status/contexts')
  .then((response) => response.json())
  .then((data) => 
    {
      let element = document.getElementById('body');
      element.innerHTML = '';
      data.forEach((entry) =>
      {
        element.innerHTML +=
          '<tr>' +
          '<td>' + entry.identifier + '</td>' +
          '<td>' + getSystemTime(entry.outcome, reference) + '</td>' +
          '<td>' + entry.number + '</td>' +
          '<td>' + entry.link + '</td>' +
          '<td>' + entry.agent + '</td>' +
          '<td>' + entry.values.join(', ') + '</td>' +
          '<td>' + getContextDetailString(entry, reference, order) + '</td>' +
          '</tr>';
      });
    });
}

function updateSessionList()
{
  let classes = [ 'Primary', 'Secondary ']
  let types   = [ '-', 'Circular Call', 'Group Call', 'SDS', 'Packet Data' ];
  let states  = [
    'INITIAL', 'FINAL', 'GROUP_TX', 'GROUP_IDLE',
    'SETUP_REQUEST', 'SETUP_ACCEPT', 'SETUP_REJECT', 'CALL_ALERT', 'CONNECT_REQUEST', 'CONNECT_CONFIRM', 'CALL_RELEASE',
    'SHORT_TRANSFER', 'SIMPLEX_GRANTED', 'SIMPLEX_IDLE', 'PDP_REQUEST', 'PDP_ACCEPT', 'PDP_REJECT', 'PDP_RELEASE'
  ];

  let getEndPoint = (data) => (data !== null) ? data.link + ' #' + data.number + ' (' + data.identifier + ') :' + data.tag : '';

  fetch('/status/sessions')
  .then((response) => response.json())
  .then((data) => 
    {
      let element = document.getElementById('body');
      element.innerHTML = '';
      data.forEach((entry) =>
      {
        element.innerHTML +=
          '<tr>' +
          '<td>' + entry.identifier + '</td>' +
          '<td>' + getSystemTime(entry.outcome, reference) + '</td>' +
          '<td>' + classes[entry.type >> 8] + ' ' + types[entry.type & 0xff] + '</td>' +
          '<td>' + states[entry.state] + '</td>' +
          '<td>' + entry.description.source + '</td>' +
          '<td>' + entry.description.destination + '</td>' +
          '<td>' + entry.description.priority + '</td>' +
          '<td>' + formatInterval(entry.count * 0.06) + '</td>' +
          '<td>' + getEndPoint(entry.points.source) + '</td>' +
          '<td>' + getEndPoint(entry.points.destination) + '</td>' +
          '<td>' + entry.values[0].join(', ') + '</td>' +
          '<td>' + entry.values[1].join(', ') + '</td>' +
          '<td>' + getSessionDetailString(0, entry, reference, order) + '</td>' +
          '<td>' + getSessionDetailString(1, entry, reference, order) + '</td>' +
          '</tr>';
      });
    });
}

function showContextList()
{
  document.getElementById('head').innerHTML = 
    '<tr><th>Identifier</th><th>Outcome</th><th>Number</th><th>Link</th><th>Agent</th>' +
    '<th>Values</th><th>Details</th></tr>';
  updateContextList();
  if (handle) clearInterval(handle);
  handle = setInterval(updateContextList, 60000);
}

function showSessionList()
{
  document.getElementById('head').innerHTML = 
    '<tr><th>Identifier</th><th>Outcome</th><th>Type</th><th>State</th>' +
    '<th>Source</th><th>Destination</th><th>Priority</th><th>Duration</th>' +
    '<th>Source EndPoint</th><th>Destination EndPoint</th>' +
    '<th>Source Values</th><th>Destination Values</th>' +
    '<th>Source Details</th><th>Destination Details</th></tr>';
  updateSessionList();
  if (handle) clearInterval(handle);
  handle = setInterval(updateSessionList, 10000);
}

function start()
{
  let actions = { '' : showContextList, 'contexts' : showContextList, 'sessions' : showSessionList };
  showSystemInformation().then(actions[window.location.hash.substring(1) || '']);
}