/* http://www.dyve.net/jquery/?googlemaps */

jQuery.googleMap = {
    maps: {},
    marker: function(m) {
        if (!m) {
            return null;
        } else if (m.lat == null && m.lng == null) {
            return jQuery.googleMap.marker(jQuery.googleMap.readFromGeo(m));
        } else {
            var flagIcon = new GIcon(G_DEFAULT_ICON);
            flagIcon.image = m.dealerType;

            var marker = new GMarker(new GLatLng(m.lat, m.lng), {icon:flagIcon});
            /*
            if (m.txt) {
            GEvent.addListener(marker, "click", function() {
            marker.openInfoWindowHtml(m.txt);
            });
            }*/
            GEvent.addListener(marker, "click", function() {
                jQuery.get(m.url, function(data) {
                    marker.openInfoWindowHtml(data)
                });
            });

            return marker;
        }
    },
    readFromGeo: function(el) {
        var $el = jQuery(el);
        var $vcard = $el.parent('.vcard');
        var $latElem = jQuery(".latitude:first", el);
        var $lngElem = jQuery(".longitude:first", el);
        var $url = jQuery(".url:first", el);
        var $dealerType = jQuery(".dealerType:first", el);
        if ($latElem && $lngElem) {

            //todo: fix this part up a bit:
            //var txtInfo = '<strong>'+jQuery('.org', $vcard).text() +'</strong><br />'+ jQuery(".adr",$vcard).html();

            return { lat: parseFloat($latElem.attr("title")), lng: parseFloat($lngElem.attr("title")), url: $url.text(), dealerType: $dealerType.text() }
        } else {
            return null;
        }
    },
    mapNum: 1
};

jQuery.fn.googleMap = function(lat, lng, zoom, options) {

    // If we aren't supported, we're done
    if (!window.GBrowserIsCompatible || !GBrowserIsCompatible()) return this;

    // Default values make for easy debugging
    /*
    if (lat == null) lat = 37.4419;
    if (lng == null) lng = -122.1419;
    if (!zoom) zoom = 13;
    */
    if (lat == null) {

        var minLat = false;
        var maxLat, minLng, maxLng;

        jQuery(options.markers).each(function() {
            myLat = parseFloat(jQuery(".latitude:first", this).text())
            myLng = parseFloat(jQuery(".longitude:first", this).text())
            if (!minLat) {
                minLat = myLat;
                maxLat = myLat;
                minLng = myLng;
                maxLng = myLng;
            }
            if (myLat < minLat) minLat = myLat;
            if (myLat > maxLat) maxLat = myLat;
            if (myLng < minLng) minLng = myLng;
            if (myLng > maxLng) maxLng = myLng;
        })
    }
    lat = minLat + (maxLat - minLat) / 2;
    lng = minLng + (maxLng - minLng) / 2;


    var R = 6371; // 6371 = km, 3958.75 = miles

    /* formula
    http://www.movable-type.co.uk/scripts/latlong.html
    http://www.daftlogic.com/projects-google-maps-distance-calculator.htm
    http://www.meridianworlddata.com/Distance-Calculation.asp
    http://www.codedblog.com/2007/09/28/how-to-auto-zoom-and-auto-center-google-maps/
		
		based on the Great Circle Distance Formula using decimal degrees
    www.meridianworlddata.com/Distance-Calculation.asp... use 3963.0 for value in miles.
    */
    dist = 6378.7 * Math.acos(Math.sin(minLat / 57.2958) * Math.sin(maxLat / 57.2958) + Math.cos(minLat / 57.2958) * Math.cos(maxLat / 57.2958) * Math.cos(maxLng / 57.2958 - minLng / 57.2958));
     //todo: adjust these settings a bit
    /*if (dist< 0.5) 		zoom=16;
    else if (dist < 2)	zoom=15;
    else */
    if (dist < 3) zoom = 14;
    else if (dist < 12) zoom = 13;
    //	else if (dist < 6)	zoom=12;
    //	else if (dist < 12) zoom=11;
    else if (dist < 26) zoom = 10;
    else if (dist < 50) zoom = 9;
    else zoom = 8;

    //debugging:
    //console.log('lat:'+lat+', lng:'+lng +', zoom:'+zoom+', distance:' +dist+' km');
    //console.log('zoom:'+zoom+', distance:' +dist+' km');

    // Sanitize options
    if (!options || typeof options != 'object') options = {};
    options.mapOptions = options.mapOptions || {};
    options.markers = options.markers || [];
    options.controls = options.controls || {};

    // Map all our elements
    return this.each(function() {
        // Make sure we have a valid id
        if (!this.id) this.id = "gMap" + jQuery.googleMap.mapNum++;
        // Create a map and a shortcut to it at the same time
        var map = jQuery.googleMap.maps[this.id] = new GMap2(this, options.mapOptions);
        // Center and zoom the map
        map.setCenter(new GLatLng(lat, lng), zoom);
        // Add controls to our map
        for (var i = 0; i < options.controls.length; i++) {
            var c = options.controls[i];
            eval("map.addControl(new " + c + "());");
        }
        // If we have markers, put them on the map
        var marker = null;
        for (var i = 0; i < options.markers.length; i++) {
            if (marker = jQuery.googleMap.marker(options.markers[i])) map.addOverlay(marker);
        }
    });

    //clean up when leaving the page. GUnload() resides in the remote google script.
    jQuery(window).unload(GUnload);

};