/*
 * Javascript for the Google map
 *
 * I wish I knew website
 *
 */

// coordinates for Utrecht
// map.setCenter(new GLatLng(52.069377, 5.114136), 13);

// address for the Google Docs spreadsheet gigs
// http://spreadsheets.google.com/feeds/list/pVabH0j6EqpO9qbXwzAuCGA/od6/public/basic

// address for the news
// http://spreadsheets.google.com/feeds/list/pVabH0j6EqpMOY1usFUgVXg/od6/public/basic

//<![CDATA[
var iwik_map;
var iwik_mapMarkers = [];
var iwik_mapHTMLS = [];

// Create a base icon for all of our markers that specifies the
// shadow, icon dimensions, etc.
var cm_baseIcon = new GIcon();
cm_baseIcon.shadow = "http://www.google.com/mapfiles/shadow50.png";
cm_baseIcon.iconSize = new GSize(20, 34);
cm_baseIcon.shadowSize = new GSize(37, 34);
cm_baseIcon.iconAnchor = new GPoint(9, 34);
cm_baseIcon.infoWindowAnchor = new GPoint(9, 2);
cm_baseIcon.infoShadowAnchor = new GPoint(18, 25);

// Change these parameters to customize map
var param_wsId = "od6";
var param_ssKey = "pVabH0j6EqpO9qbXwzAuCGA";
var param_useSidebar = true;
var param_gigtitle = "gigtitle";
var param_gigdescription = "gigvenue";
var param_gigdate = "gigdate";
var param_gigtime = "gigtime";
var param_gigaddress = "gigaddress";
var param_gigtown = "gigtown";
var param_gigregion = "gigregion";
var param_gigcountry = "gigcountry";
var param_giglink = "giglink";
var param_latColumn = "ltd";
var param_lngColumn = "lng";
var param_rankColumn = "";
var param_iconType = "green";
var param_iconOverType = "orange";

/**
 * Loads map and calls function to load in worksheet data.
 */
function cm_load() {  
  if (GBrowserIsCompatible()) {
    // create the map
    iwik_map = new GMap2(document.getElementById("iwik_map"));
    iwik_map.addControl(new GLargeMapControl());
    iwik_map.addControl(new GMapTypeControl());
	iwik_map.enableDragging();
	iwik_map.enableScrollWheelZoom();
    iwik_map.setCenter(new GLatLng(52.069377, 5.114136), 6);
	iwik_map.setMapType(G_HYBRID_MAP);

cm_getJSON();
  } else {
    alert("Sorry, the Google Maps API is not compatible with this browser");
  } 
}

/**
 * Function called when marker on the map is clicked.
 * Opens an info window (bubble) above the marker.
 * @param {Number} markerNum Number of marker in global array
 */
function cm_markerClicked(markerNum) {
  iwik_mapMarkers[markerNum].openInfoWindowHtml(iwik_mapHTMLS[markerNum]);
}

/**
 * Function that sorts 2 worksheet rows from JSON feed
 * based on their rank column. Only called if column is defined.
 * @param {rowA} Object Represents row in JSON feed
 * @param {rowB} Object Represents row in JSON feed
 * @return {Number} Difference between row values
 */
function cm_sortRows(rowA, rowB) {
  var rowAValue = parseFloat(rowA["gsx$" + param_rankColumn].$t);
  var rowBValue = parseFloat(rowB["gsx$" + param_rankColumn].$t);

  return rowAValue - rowBValue;
}

/** 
 * Called when JSON is loaded. Creates sidebar if param_sideBar is true.
 * Sorts rows if param_rankColumn is valid column. Iterates through worksheet rows, 
 * creating marker and sidebar entries for each row.
 * @param {JSON} json Worksheet feed
 */       
function cm_loadMapJSON(json) {
  var usingRank = false;

  if(param_useSidebar == true) {
    var sidebarTD = document.createElement("td");
    sidebarTD.setAttribute("width","150");
    sidebarTD.setAttribute("valign","top");
    var sidebarDIV = document.createElement("div");
    sidebarDIV.id = "cm_sidebarDIV";
    sidebarDIV.style.overflow = "auto";
    sidebarDIV.style.height = "450px";
//    sidebarDIV.style.fontSize = "11px";
	   sidebarDIV.style.color = "#000000";
    sidebarTD.appendChild(sidebarDIV);
    document.getElementById("iwik_mapTR").appendChild(sidebarTD);
  }

  var bounds = new GLatLngBounds();	  

  if(json.feed.entry[0]["gsx$" + param_rankColumn]) {
    usingRank = true;
    json.feed.entry.sort(cm_sortRows);
  }

  for (var i = 0; i < json.feed.entry.length; i++) {
    var entry = json.feed.entry[i];
    if(entry["gsx$" + param_latColumn]) {
	  /*
	   * This code to fix a compatibility problem: in NL they use , as a decimal deliminator
	   */
	  var lat = entry["gsx$" + param_latColumn].$t;
	  var lng = entry["gsx$" + param_lngColumn].$t;
	  lat = parseFloat(lat.replace(',', '.'));
	  lng = parseFloat(lng.replace(',', '.'));
	  /*
	   * original code
      var lat = parseFloat(entry["gsx$" + param_latColumn].$t);
      var lng = parseFloat(entry["gsx$" + param_lngColumn].$t);
	  */

      var point = new GLatLng(lat,lng);
      var html = "<div class='mapinfo'>";
      html += "<strong>";
	if(entry["gsx$" + param_giglink]) {
        html += "<a href='" + entry["gsx$"+param_giglink].$t + "'>";
      }
	  html += entry["gsx$"+param_gigtitle].$t;
 	if(entry["gsx$" + param_giglink]) {
		html += "</a>";
	}
	  html += "</strong>";

      var label = entry["gsx$"+param_gigtitle].$t;
      var rank = 0;
      if(usingRank && entry["gsx$" + param_rankColumn]) {
        rank = parseInt(entry["gsx$"+param_rankColumn].$t);
      }
      if(entry["gsx$" + param_gigdescription]) {
        html += "<br/>" + entry["gsx$"+param_gigdescription].$t;
      }
	// the date
      if(entry["gsx$" + param_gigdate]) {
        html += "<br/>" + entry["gsx$"+param_gigdate].$t;
      }
		
      if(entry["gsx$" + param_gigtime]) {
        html += "<br/>" + entry["gsx$"+param_gigtime].$t;
      }
		
      if(entry["gsx$" + param_gigaddress]) {
        html += "<br/>" + entry["gsx$"+param_gigaddress].$t;
      }
		
      if(entry["gsx$" + param_gigtown]) {
        html += "<br/>" + entry["gsx$"+param_gigtown].$t;
      }
		
      if(entry["gsx$" + param_gigregion]) {
        html += "<br/>" + entry["gsx$"+param_gigregion].$t;
      }
		
      if(entry["gsx$" + param_gigcountry]) {
        html += "<br/>" + entry["gsx$"+param_gigcountry].$t;
      }
		
      html += "</div>";

      // create the marker
      var marker = cm_createMarker(point,label,html,rank);
      iwik_map.addOverlay(marker);
      iwik_mapMarkers.push(marker);
      iwik_mapHTMLS.push(html);
      bounds.extend(point);
	  
      if(param_useSidebar == true) {
        var markerA = document.createElement("a");
        markerA.setAttribute("href","javascript:cm_markerClicked('" + i +"')");
//        markerA.style.color = "#000000";
        var sidebarText= "";
        if(usingRank) {
          sidebarText += rank + ") ";
        } 
        sidebarText += label;
        markerA.appendChild(document.createTextNode(sidebarText));
        sidebarDIV.appendChild(markerA);
        sidebarDIV.appendChild(document.createElement("br"));
        sidebarDIV.appendChild(document.createElement("br"));
      } 
    }
  }

  iwik_map.setZoom(iwik_map.getBoundsZoomLevel(bounds));
  iwik_map.setCenter(bounds.getCenter());
}

/**
 * Creates marker with ranked Icon or blank icon,
 * depending if rank is defined. Assigns onclick function.
 * @param {GLatLng} point Point to create marker at
 * @param {String} title Tooltip title to display for marker
 * @param {String} html HTML to display in InfoWindow
 * @param {Number} rank Number rank of marker, used in creating icon
 * @return {GMarker} Marker created
 */
function cm_createMarker(point, title, html, rank) {
  var markerOpts = {};
  var nIcon = new GIcon(cm_baseIcon);

  if(rank > 0 && rank < 100) {
    nIcon.imageOut = "http://gmaps-samples.googlecode.com/svn/trunk/" +
        "markers/" + param_iconType + "/marker" + rank + ".png";
    nIcon.imageOver = "http://gmaps-samples.googlecode.com/svn/trunk/" +
        "markers/" + param_iconOverType + "/marker" + rank + ".png";
    nIcon.image = nIcon.imageOut; 
  } else { 
    nIcon.imageOut = "http://gmaps-samples.googlecode.com/svn/trunk/" +
        "markers/" + param_iconType + "/blank.png";
    nIcon.imageOver = "http://gmaps-samples.googlecode.com/svn/trunk/" +
        "markers/" + param_iconOverType + "/blank.png";
    nIcon.image = nIcon.imageOut;
  }

  markerOpts.icon = nIcon;
  markerOpts.title = title;		 
  var marker = new GMarker(point, markerOpts);
	
  GEvent.addListener(marker, "click", function() {
    marker.openInfoWindowHtml(html);
  });
  GEvent.addListener(marker, "mouseover", function() {
    marker.setImage(marker.getIcon().imageOver);
  });
  GEvent.addListener(marker, "mouseout", function() {
    marker.setImage(marker.getIcon().imageOut);
  });
  GEvent.addListener(marker, "infowindowopen", function() {
    marker.setImage(marker.getIcon().imageOver);
  });
  GEvent.addListener(marker, "infowindowclose", function() {
    marker.setImage(marker.getIcon().imageOut);
  });
  return marker;
}

/**
 * Creates a script tag in the page that loads in the 
 * JSON feed for the specified key/ID. 
 * Once loaded, it calls cm_loadMapJSON.
 */
function cm_getJSON() {

  // Retrieve the JSON feed.
  var script = document.createElement('script');

  script.setAttribute('src', 'http://spreadsheets.google.com/feeds/list'
                         + '/' + param_ssKey + '/' + param_wsId + '/public/values' +
                        '?alt=json-in-script&callback=cm_loadMapJSON');
  script.setAttribute('id', 'jsonScript');
  script.setAttribute('type', 'text/javascript');
  document.documentElement.firstChild.appendChild(script);
}

setTimeout('cm_load()', 500); 

//]]>

// Recenters the viewer
function animate() {    
	iwik_map.setCenter(new GLatLng(52.069377, 5.114136), 8);
	iwik_map.openInfoWindow(iwik_map.getCenter(),
	document.createTextNode("I Wish I Knew's home"));
}