// JavaScript Document for google map on front page

var businesses = [
//{name: 'Villas di Tuscany',
//street: '7120 Regency Square Blvd',
//city: 'Houston',
//state: 'TX',
//zip: '77036',
//country: 'USA',
//phone: '(415) 567-6742',
//lat: 29.715660, lng: -95.507207},
//{name: 'Villas del Parque',
//street: '11403 Carla St',
//city: 'Houston',
//state: 'TX',
//zip: '77076',
//country: 'USA',
//phone: '(415) 567-6742',
//lat: 29.866677, lng: -95.373950},
{name: 'Shady Acres Manor',
street: '1200 W 17th St',
city: 'Houston',
state: 'TX',
zip: '77008',
country: 'USA',
//phone: '(415) 567-6742',
lat: 29.800672, lng: -95.418594}
];

/**
 * The map object, null until script loads in.
 * @type {GMap2}
 */
var map = null;  

/**
 * The bounds of the markers once loaded in.
 * @type {GLatLngBounds}
 */
var bounds = null;

/**
 * The marker with currently opened info window.
 * @type {GMarker}
 */
var currentMarker = null;

/**
 * The dom element that the map is loaded into
 * @type {Element}
 */
var mapDiv = null;

/**
 * The dom element that everything is a child of.
 * @type {Element}
 */
var containerDiv = null;

/**
 * Position of mouse click (clientX) on map div when in static mode.
 * @type {Number}
 */
var clickedX = 0;

/**
 * Position of mouse click (clientY) on map div when in static mode.
 * @type {Number}
 */
var clickedY = 0;

/**
 * Indicates whether we've created a script tag with Maps API yet
 * @type {Boolean}
 */
var isLoaded = false;


/**
 * Called after script is asynchronously loaded in.
 * Creates the GMap2, GMarker objects and performs actions according to 
 * what the user did to trigger the map load (search, zoom, click etc).
 */
function loadMap() {
  if (GBrowserIsCompatible()) {
    mapDiv.style.background = '#fff';
    mapDiv.style.cursor = '';
    map = new GMap2(mapDiv, {logoPassive: true});
    bounds = new GLatLngBounds();
    for (var i = 0; i < businesses.length; i++) {
      bounds.extend(new GLatLng(businesses[i].lat, businesses[i].lng));
    }
    var latSpan = bounds.toSpan().lat();
    map.setCenter(bounds.getCenter(), map.getBoundsZoomLevel(bounds));
	map.enableScrollWheelZoom();
	map.enableContinuousZoom();
	
    // The static map server gives markers more space when calculating
    // bounds and zoom level, so sometimes the API will give a higher
    // zoom level than was used by the static map server.
    // The .98 value is just a guess right now, may need tweaking.
    var newBounds = map.getBounds();
    var newLatSpan = newBounds.toSpan().lat();
    if (latSpan/newLatSpan > .90) { map.zoomOut(); }

    for (var i = 0; i < businesses.length; i++) {
      var marker = createMarker(i);
      var latlng = marker.getLatLng();
      var pixel = map.fromLatLngToDivPixel(latlng);
      if (Math.abs(pixel.x - clickedX) < 12 && Math.abs(pixel.y - clickedY) < 20) {
        //GEvent.trigger(marker, 'click');
      }
      map.addOverlay(marker);
    }
  }
}

/**
 * Zooms to the viewport that fits all the markers.
 */
function zoomToAll() {
  map.setCenter(bounds.getCenter(), map.getBoundsZoomLevel(bounds));
}

/**
 * Creates a marker for the given business.
 * @param {Number} ind
 * @return {GMarker}
 */
function createMarker(ind) {
  var business = businesses[ind];
  var marker = new GMarker(new GLatLng(business.lat, business.lng));
  GEvent.addListener(marker, 'click', function() {
    marker.html = ['<b>', business.name, '</b><br>', 
                 business.street, '<br> ', business.city, ',', 
                 business.state, ' ', business.zip, '<br>',
                 business.phone, '<br><br>', 'Get directions: ', 
                 '<a target="_blank" ',
                 'href="http://maps.google.com/maps?saddr=&daddr=',
                 formatAddressForMaps(business), '">to here</a> - ', 
                 '<a target="_blank" ',
                 'href="http://maps.google.com/maps?saddr=',
                 formatAddressForMaps(business), '&daddr=', '"> from here <br> ',
                 '<a href="javascript:zoomToAll()">View all locations</a>'].join('');
    currentMarker = marker;
    marker.openInfoWindowHtml(marker.html);
  });
  return marker;
}

/**
 * Formats business info into a URL-friendly version for maps url.
 * @param {Object} business
 * @return {String}
 */
function formatAddressForMaps(business) {
  var address = business.street + ' ' + business.city + ' ' + business.state + ' ' + business.zip;
  return escape(address.replace(' ', '+'));
}

/**
 * Convenience function for creating an element and assigning an id to it.
 * @param {String} elementType
 * @param {String} id
 * @return {Element} 
 */
function _cel(elementType, id) {
  var element = document.createElement(elementType);
  element.id = id;
  return element;
}

/**
 * Loads in the Maps API script. This is called after some sort of user interaction.
 * The script loads asynchronously and calls loadMap once it's in.
 */
function loadScript() {
  if (!isLoaded) {
    isLoaded = true;
    var div = document.createElement('div');
    div.className = 'message';
    div.innerHTML = 'Loading...';
    div.style.left = (450/2 - 53) + 'px';
    div.style.top = 340/2 + 'px'; 
    mapDiv.appendChild(div);
    var script = document.createElement('script');
    script.type = 'text/javascript';
    script.src = 'http://maps.google.com/maps?file=api&v=2.x' + 
                 '&async=2&callback=loadMap&key=ABQIAAAA7CCAYnG17eojxdKsab8YNhT8hizTWPH6JxjkxxdwUoE2QRBh8RSyPlfCSotEl0qhp53Pxb3gqII9gw';
    document.body.appendChild(script);
  }
}

/**
 * Sets up the gadget by setting CSS and click events.
 */
function loadMapGadget() {
  containerDiv = document.getElementById('container');
  mapDiv = document.getElementById('map');
  loadScript();

  mapDiv.style.cursor = 'pointer';

  var urlString = ['http://maps.google.com/staticmap?markers='];
  var markerString = [];
  for (var i = 0; i < businesses.length; i++) {
    markerString.push(businesses[i].lat + ',' + businesses[i].lng + ',red');
  }
  urlString.push(markerString.join('|'));
  urlString.push('&size=450x340');
  urlString.push('&key=ABQIAAAA7CCAYnG17eojxdKsab8YNhT8hizTWPH6JxjkxxdwUoE2QRBh8RSyPlfCSotEl0qhp53Pxb3gqII9gw');
  //mapDiv.style.background = 'url(\'' + urlString.join('') + '\')';

}