/**

 * parseCsv()
 * @return an array of GLatLng() objects
 * @param opt_options object {lat, lng} integers defining the csv cells of coordinates (default: {lat:1, lng:0})
 * @author Esa 2008
 */

String.prototype.parseCsv = function(opt_options){
  var results = [];
  var opts = opt_options||{};
  var iLat = opts.lat||1;
  var iLng = opts.lng||0;
  var lines = this.split("\n");
  for (var i=0; i<lines.length; i++) {
    var blocks = lines[i].split('"');

    //finding commas inside quotes. Replace them with '::::'
    for(var j=0;j<blocks.length;j++){
      if(j%2){
        blocks[j]=blocks[j].replace(/,/g,'::::');
      }
    }  //@author Esa 2008, keep this note.

    lines[i] = blocks.join("");
    var lineArray = lines[i].split(",");
    var lat = parseFloat(lineArray[iLat]);
    var lng = parseFloat(lineArray[iLng]);
    var point = new GLatLng(lat,lng);

    //after splitting by commas, we put hidden ones back
    for(var cell in lineArray){
      lineArray[cell] = lineArray[cell].replace(/::::/g,',');
    } //corrupted line step-over
    if(!isNaN(lat+lng)){
      point.textArray = lineArray;
      results.push(point);
    }
  }
  return results;
}

//parameters for tinyIcon function
//Electronics freaks  know the numbering scheme
var icons = ["black","brown","red","orange","yellow","green","blue","purple","gray","white"];




//preload loop
for(var color in icons){
  tinyImage(icons[color], true);
}

/**
 * Marker icon
 */

function tinyImage(opt_color, opt_preload){

  var color = opt_color||"red";
//  var src_ = "http://labs.google.com/ridefinder/images/mm_20_"+color+".png";
    var src_ = "images/school_icon.gif";
  if(opt_preload){

    var preImage = new Image();

    preImage.src = src_;

  }

  return  src_;
}

function tinyIcon(opt_color){
  var tiny = new GIcon();
  tiny.image = tinyImage(opt_color);

//  tiny.shadow = "http://labs.google.com/ridefinder/images/mm_20_shadow.png";

  tiny.iconSize = new GSize(26, 30);

  tiny.shadowSize = new GSize(22, 20);

  tiny.iconAnchor = new GPoint(6, 20);

  tiny.infoWindowAnchor = new GPoint(5, 1);

  tiny.imageMap = [4,0,0,4,0,7,3,11,4,19,7,19,8,11,11,7,11,4,7,0];

  tiny.transparent = "http://maps.google.com/mapfiles/transparent.png";

  return tiny;

}


/**

 * GMap2.showBounds() method. Fit bounds to viewport with paddings.

 * @ author Esa 2008

 * @ param bounds_ GLatLngBounds()

 * @ param opt_options Optional options object {top, right, bottom, left, save}

 */

GMap2.prototype.showBounds = function(bounds_, opt_options){

  var opts = opt_options||{};

  opts.top = opt_options.top*1||0;

  opts.left = opt_options.left*1||0;

  opts.bottom = opt_options.bottom*1||0;

  opts.right = opt_options.right*1||0;

  opts.save = opt_options.save||true;

  opts.disableSetCenter = opt_options.disableSetCenter||false;

  var ty = this.getCurrentMapType();

  var port = this.getSize();

  if(!opts.disableSetCenter){

    var virtualPort = new GSize(port.width - opts.left - opts.right, 

                            port.height - opts.top - opts.bottom);

    this.setZoom(ty.getBoundsZoomLevel(bounds_, virtualPort));

    var xOffs = (opts.left - opts.right)/2;

    var yOffs = (opts.top - opts.bottom)/2;

    var bPxCenter = this.fromLatLngToDivPixel(bounds_.getCenter());

    var newCenter = this.fromDivPixelToLatLng(new GPoint(bPxCenter.x-xOffs, bPxCenter.y-yOffs));

    this.setCenter(newCenter);

    if(opts.save)this.savePosition();

  }

  var portBounds = new GLatLngBounds();

  portBounds.extend(this.fromContainerPixelToLatLng(new GPoint(opts.left, port.height-opts.bottom)));

  portBounds.extend(this.fromContainerPixelToLatLng(new GPoint(port.width-opts.right, opts.top)));

  return portBounds;

}

/**

 * create the markers

 */

function populateMap(points, opt_options){
  var bounds = new GLatLngBounds();
  var opts = opt_options||{};
  var color = opts.color||'red';
  for (var i=0; i < points.length; i++) {
    var label = points[i].textArray[2];
    points[i].marker = new GMarker(points[i],{title: label, icon:tinyIcon(opts.icon)});
    map.addOverlay(points[i].marker);
    bounds.extend(points[i]);
    createInfoWindow(points[i]);
    addToMapBar(points[i], opts);
  }

  var paddings = {top:30, right:10, bottom:10, left:50};
  map.showBounds(bounds,paddings); 

}

/**

 * A general helper function for creating html elements. <div> as default element type
 * @author Esa 2008 
 * used for infowindows and mapbar
 */

function createElem(opt_className, opt_html, opt_tagName) {

  var tag = opt_tagName||"div";
  var elem = document.createElement(tag);
  if (opt_html) elem.innerHTML = opt_html;
  if (opt_className) elem.className = opt_className;
  return elem;

}


/**
 * create infowindow
 */

function createInfoWindow(point){
  var iwNode = createElem("info-window");
  for(var i=2; i<point.textArray.length; i++)
  iwNode.appendChild(createElem("iw-cell-"+i, point.textArray[i]));
  point.marker.bindInfoWindow(iwNode,{maxWidth:300});
}



/**
 * This function triggers the downloading and parsing of a selected text file
 * marker, mapbar and infowindow data is extracted from the file
 */

function ajaxLoad(fileNumber,opt_options){
  var opts = opt_options||{};
  var iconNumber = opts.iconNumber||2;
  opts.icon = icons[iconNumber];
  clearMapBar();
  map.clearOverlays();
  var process = function(material){
    var entries = material.parseCsv(material, opts);
    populateMap(entries, opts);
  }
  GDownloadUrl(textFiles[fileNumber], process);

}