/* An InfoBox is like an info window, but it displays
 * under the marker, opens quicker, and has flexible styling.
 * @param {GLatLng} latlng Point to place bar at
 * @param {Map} map The map on which to display this InfoBox.
 * @param {Object} opts Passes configuration options - content,
 *   offsetVertical, offsetHorizontal, className, height, width
 */
function InfoBox(options) {
  google.maps.OverlayView.call(this);
  
  var opts = jQuery.extend({
    latlng: null, // REQUIRED
    map: null,    // REQUIRED
    vOffset: 0,
    hOffset: 0,
    width: 229,
    height: 220,
    content: '<b>Hello World!</b>',
    backgroundImg: '/images/tooltip.png'
  }, options);
  
  this.latlng_ = opts.latlng;
  this.map_ = opts.map;
  this.offsetVertical_ = opts.vOffset;
  this.offsetHorizontal_ = opts.hOffset;
  this.content_ = opts.content;
  this.width_ = opts.width;
  this.height_ = opts.height;
  this.bgImgPath = opts.backgroundImg;

  var me = this;
  this.boundsChangedListener_ =
    google.maps.event.addListener(this.map_, "bounds_changed", function() {
      return me.panMap.apply(me);
    });

  // Once the properties of this OverlayView are initialized, set its map so
  // that we can display it.  This will trigger calls to panes_changed and
  // draw.
  this.setMap(this.map_);
}

/* InfoBox extends GOverlay class from the Google Maps API
 */
InfoBox.prototype = new google.maps.OverlayView();

/* Creates the DIV representing this InfoBox
 */
InfoBox.prototype.remove = function() {
  if (this.div_) {
    this.div_.parentNode.removeChild(this.div_);
    this.div_ = null;
  }
};

/* Redraw the Bar based on the current projection and zoom level
 */
InfoBox.prototype.draw = function() {
  // Creates the element if it doesn't exist already.
  if (!this.div_) return;

  // Calculate the DIV coordinates of two opposite corners of our bounds to
  // get the size and position of our Bar
  var pixPosition = this.getProjection().fromLatLngToDivPixel(this.latlng_);
  if (!pixPosition) return;
  
  // Set unique ID on div
  this.div_.id = 'InfoBox';
  
  // Now position our DIV based on the DIV coordinates of our bounds
  this.div_.style.width = this.width_ + "px";
  this.div_.style.left = (pixPosition.x + this.offsetHorizontal_) + "px";
  this.div_.style.height = this.height_ + "px";
  this.div_.style.top = (pixPosition.y + this.offsetVertical_) + "px";
  this.div_.style.display = 'block';
  
  jQuery(this.tooltip_).trigger('infoBoxAdded', this.div_);
};

/* Creates the DIV representing this InfoBox in the floatPane.  If the panes
 * object, retrieved by calling getPanes, is null, remove the element from the
 * DOM.  If the div exists, but its parent is not the floatPane, move the div
 * to the new pane.
 * Called from within draw.  Alternatively, this can be called specifically on
 * a panes_changed event.
 */
InfoBox.prototype.onAdd = function() {
  var panes = this.getPanes();
  var div = this.div_;
  if (!div) {
    // This does not handle changing panes.  You can set the map to be null and
    // then reset the map to move the div.
    div = this.div_ = document.createElement("div");
    div.style.border = "0px none";
    div.style.position = "absolute";
    div.style.background = 'url(' + this.bgImgPath + ')';
    div.style.width = this.width_ + "px";
    div.style.height = this.height_ + "px";
    var contentDiv = document.createElement("div");
    contentDiv.innerHTML = this.content_;
    
    // Build address button
    var addressBtn = document.createElement('div');
    addressBtn.className = 'addressButton ro';
    
    // Bulid features button
    var featureBtn = document.createElement('div');
    featureBtn.className = 'featuresButton';
    
    // Build details button
    var detailsBtn = document.createElement('a');
    detailsBtn.className = 'detailsButton';
    
    // Build directions button
    var directionsBtn = document.createElement('a');
    directionsBtn.className = 'directionsButton';
    
    function togglePanes() {
      jQuery('.addressButton, .featuresButton').toggleClass('ro');
      jQuery('.pane', '#InfoBox').toggle();
    }
    
    jQuery(addressBtn).bind('click', togglePanes);
    jQuery(featureBtn).bind('click', togglePanes);
    
    // Build close button
    var closeBtn = document.createElement("div");
    closeBtn.style.position = 'absolute';
    closeBtn.style.right = '5px';
    closeBtn.style.top = '5px';
    closeBtn.style.width = '20px';
    closeBtn.style.height = '20px';
    closeBtn.style.cursor = 'pointer';

    function removeInfoBox(ib) {
      return function() {
        ib.setMap(null);
      };
    }

    google.maps.event.addDomListener(closeBtn, 'click', removeInfoBox(this));
    
    // Build features tooltip
    var tooltip = document.createElement('div');
		tooltip.id = 'InfoBoxTooltip';
		tooltip.style.display = 'none';
		this.tooltip_ = tooltip;
    
    div.appendChild(addressBtn);
    div.appendChild(featureBtn);
    div.appendChild(detailsBtn);
    div.appendChild(directionsBtn);
    div.appendChild(closeBtn);
    div.appendChild(tooltip);
    div.appendChild(contentDiv);
    div.style.display = 'none';
    panes.floatPane.appendChild(div);
    this.panMap();
  } else if (div.parentNode != panes.floatPane) {
    // The panes have changed.  Move the div.
    div.parentNode.removeChild(div);
    panes.floatPane.appendChild(div);
  } else {
    // The panes have not changed, so no need to create or move the div.
  }
}

/* Pan the map to fit the InfoBox.
 */
InfoBox.prototype.panMap = function() {
  // if we go beyond map, pan map
  var map = this.map_;
  var bounds = map.getBounds();
  if (!bounds) return;

  // The position of the infowindow
  var position = this.latlng_;

  // The dimension of the infowindow
  var iwWidth = this.width_;
  var iwHeight = this.height_;

  // The offset position of the infowindow
  var iwOffsetX = this.offsetHorizontal_;
  var iwOffsetY = this.offsetVertical_;

  // Padding on the infowindow
  var padX = 40;
  var padY = 40;

  // The degrees per pixel
  var mapDiv = map.getDiv();
  var mapWidth = mapDiv.offsetWidth;
  var mapHeight = mapDiv.offsetHeight;
  var boundsSpan = bounds.toSpan();
  var longSpan = boundsSpan.lng();
  var latSpan = boundsSpan.lat();
  var degPixelX = longSpan / mapWidth;
  var degPixelY = latSpan / mapHeight;

  // The bounds of the map
  var mapWestLng = bounds.getSouthWest().lng();
  var mapEastLng = bounds.getNorthEast().lng();
  var mapNorthLat = bounds.getNorthEast().lat();
  var mapSouthLat = bounds.getSouthWest().lat();

  // The bounds of the infowindow
  var iwWestLng = position.lng() + (iwOffsetX - padX) * degPixelX;
  var iwEastLng = position.lng() + (iwOffsetX + iwWidth + padX) * degPixelX;
  var iwNorthLat = position.lat() - (iwOffsetY - padY) * degPixelY;
  var iwSouthLat = position.lat() - (iwOffsetY + iwHeight + padY) * degPixelY;

  // calculate center shift
  var shiftLng =
      (iwWestLng < mapWestLng ? mapWestLng - iwWestLng : 0) +
      (iwEastLng > mapEastLng ? mapEastLng - iwEastLng : 0);
  var shiftLat =
      (iwNorthLat > mapNorthLat ? mapNorthLat - iwNorthLat : 0) +
      (iwSouthLat < mapSouthLat ? mapSouthLat - iwSouthLat : 0);

  // The center of the map
  var center = map.getCenter();

  // The new map center
  var centerX = center.lng() - shiftLng;
  var centerY = center.lat() - shiftLat;

  // center the map to the new shifted center
  map.setCenter(new google.maps.LatLng(centerY, centerX));

  // Remove the listener after panning is complete.
  google.maps.event.removeListener(this.boundsChangedListener_);
  this.boundsChangedListener_ = null;
};