var props = {
  load : function(path, callback, base) {
    if (typeof (base) == 'undefined')
      base = "/json/";
    $.getJSON(base + path, function(data) {
      callback(props.makeNode(data));
    });
  },

  save : function(node, url) {
    alert("can't save yet :-(");
  },

  // convert a JSON node to a PropertyNode by adding
  // the API Methods
  makeNode : function(node) {
    if (typeof (node) == 'undefined')
      return node; // not an object
    if (typeof (node.getNode) == 'function')
      return node; // allready done

    node.getNode = function(name, index) {
      if (typeof (index) == 'undefined') {
        index = 0;
      }
      var reply;
      $.each(node.children, function(key, child) {
        if (child.name == name && child.index == index) {
          reply = props.makeNode(child);
        }
      });

      // be a bit more graceful here...
      if (typeof (reply) == 'undefined')
        alert('unknown property: ' + name + ':' + index);
      return reply;
    };
    return node;
  }
};

var reloadProperties = function() {
  props.load("instrumentation?d=3", function(n) {
    $("#com1u").val(n.getNode("comm").getNode("frequencies").getNode("selected-mhz-fmt").value);
    $("#com1s").val(n.getNode("comm").getNode("frequencies").getNode("standby-mhz-fmt").value);
    $("#com2u").val(n.getNode("comm", 1).getNode("frequencies").getNode("selected-mhz-fmt").value);
    $("#com2s").val(n.getNode("comm", 1).getNode("frequencies").getNode("standby-mhz-fmt").value);
    $("#nav1u").val(n.getNode("nav").getNode("frequencies").getNode("selected-mhz-fmt").value);
    $("#nav1s").val(n.getNode("nav").getNode("frequencies").getNode("standby-mhz-fmt").value);
    $("#nav1rad").val(n.getNode("nav").getNode("radials").getNode("selected-deg").value);
    $("#nav2u").val(n.getNode("nav", 1).getNode("frequencies").getNode("selected-mhz-fmt").value);
    $("#nav2s").val(n.getNode("nav", 1).getNode("frequencies").getNode("standby-mhz-fmt").value);
    $("#nav2rad").val(n.getNode("nav", 1).getNode("radials").getNode("selected-deg").value);
    $("#adf1u").val(n.getNode("adf").getNode("frequencies").getNode("selected-khz").value);
    $("#adf1s").val(n.getNode("adf").getNode("frequencies").getNode("standby-khz").value);
    $("#adf1rad").val(n.getNode("adf").getNode("rotation-deg").value);
    $("#dme1u").val(n.getNode("dme").getNode("frequencies").getNode("selected-mhz").value);
  });

};

$(document).ready(function() {

  $("#com1swap").click(function() {
    var v = $("#com1u").val();
    $("#com1u").val($("#com1s").val());
    $("#com1s").val(v);
  });

  $("#com2swap").click(function() {
    var v = $("#com2u").val();
    $("#com2u").val($("#com2s").val());
    $("#com2s").val(v);
  });

  $("#nav1swap").click(function() {
    var v = $("#nav1u").val();
    $("#nav1u").val($("#nav1s").val());
    $("#nav1s").val(v);
  });

  $("#nav2swap").click(function() {
    var v = $("#nav2u").val();
    $("#nav2u").val($("#nav2s").val());
    $("#nav2s").val(v);
  });

  $("#adf1swap").click(function() {
    var v = $("#adf1u").val();
    $("#adf1u").val($("#adf1s").val());
    $("#adf1s").val(v);
  });

  reloadProperties();
  window.setInterval(reloadProperties, 5000);
});