source: main/trunk/greenstone3/web/interfaces/default/js/map-scripts.js@ 25868

var _docList = new Array();
_docList.ids = new Array();
_docList.getDocByIndex = function(index)
{
    return _docList[_docList.ids[index]];
};

var _map;
var _intervalHandle;
var _baseURL = document.URL.substring(0, document.URL.indexOf("?") + 1);
var _retrievedClassifiers = new Array();
var _preventLoopingSingleMarker = false;
var _searchRunning = false;
var _nearbyDocs = new Array();

function initializeMapScripts() 
{
    modifyFunctions();
    
    setUpMap();
    
    var jsonNodeDiv = document.getElementById("jsonNodes");
    if(jsonNodeDiv)
    {
        var jsonNodes = eval(jsonNodeDiv.innerHTML);
        if(jsonNodes && jsonNodes.length > 0)
        {
            for(var i = 0; i < jsonNodes.length; i++)
            {
                _docList[jsonNodes[i].nodeID] = jsonNodes[i];
                _docList.ids.push(jsonNodes[i].nodeID);
                createMarker(jsonNodes[i], true);
            }
            updateMap();
        }
        else
        {
            document.getElementById("map_canvas").style.visibility = "hidden";
        }
    }
    
    _docList.loopIndex = 0;
    
    if(_docList.ids.length > 1)
    {
        _intervalHandle = setInterval(loopThroughMarkers, 2000);
    }
}

function setUpMap()
{
    var myOptions = 
    {
        zoom: 2,
        center: new google.maps.LatLng(0, 0),
        mapTypeId: google.maps.MapTypeId.HYBRID
    };
    _map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
    google.maps.event.addListener(_map, 'bounds_changed', performSearchForMarkers);
}

function performSearchForMarkers()
{
    if(_searchRunning)
    {
        return;
    }
    
    _searchRunning = true;
    
    var bounds = _map.getBounds();
    
    var neLat = bounds.getNorthEast().lat();
    var neLng = bounds.getNorthEast().lng();
    var swLat = bounds.getSouthWest().lat();
    var swLng = bounds.getSouthWest().lng();
    
    var latDistance = neLat - swLat;
    var lngDistance = neLng - swLng;
    
    console.log("neLat = " + neLat + " neLng = " + neLng + " swLat = " + swLat + " swLng = " + swLng + " latDistance = " + latDistance + " lngDistance = " + lngDistance);
    
    //Check which increment to use for latitude (i.e. 0.001, 0.01, 0.1 or 1 degree increments)
    var latDelta;
    var latPrecision;
    for(var i = 3; i >= 0; i--)
    {
        latDelta = (1 / Math.pow(10, i));
        if((latDistance / latDelta) <= 5 || latDelta == 1)
        {
            latPrecision = i;
            break;
        }
    }
    
    //Check which increment to use for longitude (i.e. 0.001, 0.01, 0.1 or 1 degree increments)
    var lngDelta;
    for(var i = 3; i >= 0; i--)
    {
        lngDelta = (1 / Math.pow(10, i));
        if((lngDistance / lngDelta) <= 5 || lngDelta == 1)
        {
            lngPrecision = i;
            break;
        }
    }
    
    if(latDelta == 0.1){latDelta = 1; latPrecision = 0;}
    if(lngDelta == 0.1){lngDelta = 1; lngPrecision = 0;}
    
    var query = "";
    for(var i = 0; i <= Math.floor(latDistance / latDelta) + 1; i++)
    {
        for(var j = 0; j <= Math.floor(lngDistance / lngDelta) + 1; j++)
        {
            //Some necessary variables
            var newLat = neLat - (latDelta * i);
            var newLatString = "" + newLat;
            var newLatTrunc;
            if(newLat < 0){newLatTrunc = Math.ceil(newLat);}
            else{newLatTrunc = Math.floor(newLat);}
            
            var newLng = neLng - (lngDelta * j);
            var newLngString = "" + newLng;
            var newLngTrunc;
            if(newLng < 0){newLngTrunc = Math.ceil(newLng);}
            else{newLngTrunc = Math.floor(newLng);}

            //Construct query
            query += "(";
            query += "LA:" + coordToAbsDirected(newLatTrunc, "lat");
            if(latDelta != 1)
            { 
                query += "+AND+";
                query += "LA:" + newLatString.substring(newLatString.indexOf(".") + 1, newLatString.indexOf(".") + latPrecision + 1);
            }
            query += "+AND+";
            query += "LN:" + coordToAbsDirected(newLngTrunc, "lng");
            if(lngDelta != 1)
            { 
                query += "+AND+";
                query += "LN:" + newLngString.substring(newLngString.indexOf(".") + 1, newLngString.indexOf(".") + lngPrecision + 1);
            }
            query += ")";

            if(i != (Math.floor(latDistance / latDelta) + 1) || j != (Math.floor(lngDistance / lngDelta) + 1)){ query += "+OR+"; }
        }
    }
    
    var ajax = new gs.functions.ajaxRequest();
    ajax.open("GET", gs.xsltParams.library_name + "?a=q&s=RawQuery&rt=rd&c=" + gs.cgiParams.c + "&s1.rawquery=" + query + "&excerptid=jsonNodes", true);
    ajax.onreadystatechange = function()
    {
        if(ajax.readyState == 4 && ajax.status == 200)
        {
            if(ajax.responseText.search("id=\"jsonNodes") != -1)
            {
                var startIndex = ajax.responseText.indexOf(">");
                var endIndex = ajax.responseText.indexOf("</");

                var jsonNodes = eval(ajax.responseText.substring(startIndex+1, endIndex));
                if(jsonNodes && jsonNodes.length > 0)
                {
                    for(var i = 0; i < jsonNodes.length; i++)
                    {
                        var doc = jsonNodes[i];
                        
                        var found = false;
                        for(var j = 0; j < _docList.ids.length; j++){if(doc.nodeID == _docList.ids[j]){found = true; break;}}
                        
                        if(!found)
                        {
                            _docList[doc.nodeID] = doc;
                            _docList.ids.push(doc.nodeID);

                            createMarker(doc, false);
                        }
                    }
                }
            }
            else
            {
                console.log("No JSON information received");
            }
            
            _searchRunning = false;
        }
    }
    ajax.send();
}

function coordToAbsDirected(coord, type)
{
    var value = "" + coord;
    if(coord < 0)
    {
        value = value.substring(1);
        if(type == "lat")
        {
            value += "S";   
        }
        else
        {
            value += "W";
        }
    }
    else
    {
        if(type == "lat")
        {
            value += "N";   
        }
        else
        {
            value += "E";
        }
    }
    
    return value;
}

function updateMap()
{
    var north = -180;
    var east = -180;
    var south = 180;
    var west = 180;

    var markersOnMap = 0;
    for(var i = 0; i < _docList.ids.length; i++)
    {
        var doc = _docList.getDocByIndex(i);

        if(doc.parentCL && doc.parentCL.style.display == "none")
        {
            doc.marker.setVisible(false);
            continue;
        }
        else
        {
            doc.marker.setVisible(true);
            markersOnMap++;
        }
        
        if(doc.lat > north)
        {
            north = doc.lat;
        }
        if(doc.lat < south)
        {
            south = doc.lat;
        }
        if(doc.lng > east)
        {
            east = doc.lng;
        }
        if(doc.lng < west)
        {
            west = doc.lng;
        }
    }
    
    //As there is always 2 possible bounding boxes we want the smaller of the two
    if(east - west > 180)
    {
        var temp = east;
        east = west;
        west = temp;
    }
    
    var bounds;
    if(markersOnMap > 0)
    {
        bounds = new google.maps.LatLngBounds(new google.maps.LatLng(south, west), new google.maps.LatLng(north, east));
        _map.fitBounds(bounds);
    }
}

function loopThroughMarkers()
{
    if(_docList.ids.length == 0)
    {
        return;
    }
    
    var visibleMarkers = new Array();
    for(var i = 0; i < _docList.ids.length; i++)
    {
        var doc = _docList.getDocByIndex(i);
        if(doc.marker.getVisible())
        {
            visibleMarkers.push(doc);
        }
    }
    
    if(visibleMarkers.length < 2)
    {
        clearAllInfoBoxes();
        return;
    }

    clearAllInfoBoxes();
    
    var elem = null;
    while(!elem)
    {
        if(_docList.loopIndex >= visibleMarkers.length)
        {
            _docList.loopIndex = 0;
        }

        var doc = visibleMarkers[_docList.loopIndex];
        var elem = document.getElementById("div" + doc.nodeID);
        if(elem)
        {
            elem.style.background = "#BBFFBB";
            setTimeout(function(){elem.style.background = "";}, 2000);
        }
        _docList.loopIndex++;
    }
    doc.marker.markerInfo.open(_map, doc.marker);
}

function attachClickHandler(marker, nodeID)
{
    google.maps.event.addListener(marker, 'click', function()
    {
        document.location.href = gs.xsltParams.library_name + "?a=d&ed=1&c=" + gs.cgiParams.c + "&d=" + nodeID + "&dt=hierarchy&p.a=b&p.sa=&p.s=ClassifierBrowse";
    });
}

function focusDocument(id)
{
    var doc = _docList[id];
    if(doc)
    {
        clearInterval(_intervalHandle);
        _map.panTo(new google.maps.LatLng(doc.lat, doc.lng));
        clearAllInfoBoxes();
        doc.marker.markerInfo.open(_map, doc.marker);
    }
}

function clearAllInfoBoxes()
{
    for(var i = 0; i < _docList.ids.length; i++)
    {
        var doc = _docList.getDocByIndex(i);
        doc.marker.markerInfo.close();
    }
}

function createMarker(doc, mainMarker)
{
    var pos = new google.maps.LatLng(doc.lat,doc.lng);
    var marker
    if(mainMarker)
    {
        marker = new google.maps.Marker
        ({
            position: pos,
            title:doc.title,
            map:_map,
            icon:"interfaces/" + gs.xsltParams.interface_name + "/images/bluemarker.png"
        });
    }
    else
    {
        marker = new google.maps.Marker
        ({
            position: pos,
            title:doc.title,
            map:_map
        });
    }

    var docElement = document.getElementById("div" + doc.nodeID);
    var parent;
    if(docElement)
    {
        parent = docElement.parentNode;
    }

    while(parent && parent.nodeName != "BODY")
    {
        if(parent.getAttribute("id") && parent.getAttribute("id").search("divCL") != -1)
        {
            doc.parentCL = parent;
            break;
        }
        
        parent = parent.parentNode;
    }

    var info = new google.maps.InfoWindow({content:doc.title});
    marker.markerInfo = info;
    doc.marker = marker;

    attachClickHandler(marker, doc.nodeID);
}

function getSubClassifier(sectionID)
{
    var ajax = new gs.functions.ajaxRequest();
    ajax.open("GET", gs.xsltParams.library_name + "?a=b&rt=s&s=ClassifierBrowse&c=" + gs.cgiParams.c + "&cl=" + sectionID + "&excerptid=jsonNodes", true);      
    ajax.onreadystatechange = function()
    {
        if(ajax.readyState == 4 && ajax.status == 200)
        {
            var startIndex = ajax.responseText.indexOf(">");
            var endIndex = ajax.responseText.indexOf("</");
            
            var jsonNodes = eval(ajax.responseText.substring(startIndex+1, endIndex));
            if(jsonNodes && jsonNodes.length > 0)
            {
                for(var i = 0; i < jsonNodes.length; i++)
                {
                    var doc = jsonNodes[i];
                    _docList[doc.nodeID] = doc;
                    _docList.ids.push(doc.nodeID);

                    createMarker(doc, false);
                }
                
                document.getElementById("map_canvas").style.visibility = "visible";
            }
            
            updateMap();
        }
        else if(ajax.readyState == 4)
        {
            console.log("Error getting subclassifiers");
            return;
        }
    }
    ajax.send();
}

function performDistanceSearch(id, lat, lng, degrees)
{
    if(parseFloat(lat) > 180 || parseFloat(lat) < -180 || parseFloat(lng) > 180 || parseFloat(lat) < -180)
    {
        console.log("Latitude or longitude incorrectly formatted");
        return;
    }

    if(lat.indexOf(".") == -1 || lng.indexOf(".") == -1 || (lat.indexOf(".") + 3) >= lat.length || (lng.indexOf(".") + 3) >= lng.length)
    {
        console.log("Latitude or longitude does not have the required precision for a distance search");
        return;
    }
    
    var query = "";
    for(var i = 0; i < degrees * 2; i++)
    {
        for (var j = 0; j < degrees * 2; j++)
        {
            var latDelta = (i - degrees) * 0.01;
            var lngDelta = (j - degrees) * 0.01;
            
            query += "(" + getDistanceQueryString(lat, latDelta, 2, "LA", ["N","S"]);
            query += "+AND+";
            query += getDistanceQueryString(lng, lngDelta, 2, "LN", ["E","W"]) + ")";
            
            if(i != ((degrees * 2) - 1) || j != ((degrees * 2) - 1)){ query += "+OR+"; }
        }
    }

    var inlineTemplate = '\
    <xsl:template match="/" priority="5">\
        <table id="nearbyDocs">\
            <tr>\
                <th><a href="javascript:sortByDistance();">Distance (km)</a></th><th><a href="javascript:sortAlphabetically();">Document</a></th>\
            </tr>\
            <xsl:apply-templates select="//documentNode"/>\
        </table>\
    </xsl:template>\
    \
    <xsl:template match="documentNode" priority="5">\
        <tr>\
            <td>___<gsf:metadata name="Latitude"/>______<gsf:metadata name="Longitude"/>___</td>\
            <td><gsf:link type="document"><gsf:metadata name="Title"/></gsf:link></td>\
        </tr>\
    </xsl:template>';
    
    var ajax = new gs.functions.ajaxRequest();
    ajax.open("GET", gs.xsltParams.library_name + "?a=q&s=RawQuery&rt=rd&c=" + gs.cgiParams.c + "&s1.rawquery=" + query + "&excerptid=nearbyDocs&ilt=" + inlineTemplate.replace(/ /, "%20"), true);     
    ajax.onreadystatechange = function()
    {
        if(ajax.readyState == 4 && ajax.status == 200)
        {
            var response = ajax.responseText;
            response = response.replace(/<img src="[^"]*map_marker.png"[^>]*>/g, "");

            console.log(ajax.responseText);

            var nearbyDocsArray = new Array();

            var lats = new Array();
            var lngs = new Array();

            var matches = response.match(/___(-?[0-9\.]*)___/g);
            for(var i = 0; i < matches.length; i += 2)
            {
                var matchLatFloat = parseFloat(matches[i].replace("___", ""));
                var matchLngFloat = parseFloat(matches[i+1].replace("___", ""));

                lats.push(matchLatFloat);
                lngs.push(matchLngFloat);
                
                var distance = Math.sqrt(Math.pow(matchLatFloat - parseFloat(lat), 2) + Math.pow(matchLngFloat - parseFloat(lng), 2)) * (40000.0/360.0);
                var distanceString = "" + distance;
                distanceString = distanceString.substring(0, 6);

                response = response.replace(matches[i] + matches[i+1], distanceString);
            }
            
            var index = 0;
            var i = 0;
            while(true)
            {
                var distanceStart = response.indexOf("<td>", index);
                if(distanceStart == -1)
                {
                    break;
                }
                var distanceEnd = response.indexOf("</td>", distanceStart);
                
                var docLinkStart = response.indexOf("<td>", distanceEnd);
                var docLinkEnd = response.indexOf("</td>", docLinkStart);
                
                var dist = response.substring(distanceStart + 4, distanceEnd);
                var docLink = response.substring(docLinkStart + 4, docLinkEnd);

                _nearbyDocs.push({title:docLink, distance:dist, lat:lats[i], lng:lngs[i++]});
                
                index = docLinkEnd;
            }
            
            sortByDistance();
            
            var toggle = document.getElementById("nearbyDocumentsToggle");
            toggle.setAttribute("src", gs.imageURLs.collapse);
            gs.functions.makeToggle(toggle, document.getElementById("nearbyDocuments"));
        }
    }
    ajax.send();
}

function sortByDistance()
{
    var sortedTable = '<table id="nearbyDocs"><tr><th><a href="javascript:;">Distance (km)</a></th><th><a href="javascript:sortAlphabetically();">Document</a></th></tr>';
    _nearbyDocs.sort(function(a, b){return (a.distance - b.distance);});
    for(var i = 0; i < _nearbyDocs.length; i++)
    {
        sortedTable += "<tr><td>" + _nearbyDocs[i].distance + '</td><td onmouseover="_map.setCenter(new google.maps.LatLng(' + _nearbyDocs[i].lat + ',' + _nearbyDocs[i].lng + '))">' + _nearbyDocs[i].title + "</td></tr>";
    }
    sortedTable += "</table>";
    
    document.getElementById("nearbyDocuments").innerHTML = sortedTable;
}

function sortAlphabetically()
{
    var sortedTable = '<table id="nearbyDocs"><tr><th><a href="javascript:sortByDistance();">Distance (km)</a></th><th><a href="javascript:;">Document</a></th></tr>';
    _nearbyDocs.sort(function(a, b)
    {
        var firstTitleStartIndex = a.title.indexOf(">");
        var firstTitleEndIndex = a.title.indexOf("<", firstTitleStartIndex);
        var firstTitle = a.title.substring(firstTitleStartIndex + 1, firstTitleEndIndex);
        var secondTitleStartIndex = b.title.indexOf(">");
        var secondTitleEndIndex = b.title.indexOf("<", secondTitleStartIndex);
        var secondTitle = b.title.substring(secondTitleStartIndex + 1, secondTitleEndIndex);
        return ((firstTitle.toLowerCase() == secondTitle.toLowerCase()) ? 0 : ((firstTitle.toLowerCase() > secondTitle.toLowerCase()) ? 1 : -1));
    });
    for(var i = 0; i < _nearbyDocs.length; i++)
    {
        sortedTable += "<tr><td>" + _nearbyDocs[i].distance + '</td><td onmouseover="_map.setCenter(new google.maps.LatLng(' + _nearbyDocs[i].lat + ',' + _nearbyDocs[i].lng + '))">' + _nearbyDocs[i].title + "</td></tr>";
    }
    sortedTable += "</table>";
    
    document.getElementById("nearbyDocuments").innerHTML = sortedTable;
}

function getDistanceQueryString(currentCoord, delta, precision, indexName, dirs)
{
    var query = "";
    var coordFloat = parseFloat(currentCoord);

    var newCoord = "" + (coordFloat + delta);
    var beforeDec = newCoord.substring(0, newCoord.indexOf("."));

    var dir = dirs[0];
    if(coordFloat < 0)
    {
        dir = dirs[1];
        beforeDec = beforeDec.substring(1);
    }
    beforeDec += dir;

    var afterDec = newCoord.substring(newCoord.indexOf(".") + 1, newCoord.indexOf(".") + (precision) + 1);

    return indexName + ":" + beforeDec + "+AND+" + indexName + ":" + afterDec;
}

function modifyFunctions()
{
    toggleSection = function(sectionID)
    {
        var section = document.getElementById("div" + sectionID);
        var sectionToggle = document.getElementById("toggle" + sectionID);
        
        if(sectionToggle == undefined)
        {
            return;
        }
        
        if(section)
        {
            if(isExpanded(sectionID))
            {
                section.style.display = "none";
                sectionToggle.setAttribute("src", gs.imageURLs.expand);
                
                if(openClassifiers[sectionID] != undefined)
                {
                    delete openClassifiers[sectionID];
                }
            }
            else
            {
                section.style.display = "block";
                sectionToggle.setAttribute("src", gs.imageURLs.collapse);
                openClassifiers[sectionID] = true;  
            }
            updateOpenClassifiers();
            updateMap();
        }
        else
        {
            httpRequest(sectionID);
        }
    }
    
    httpRequest = function(sectionID)
    {
        if(!inProgress[sectionID])
        {
            inProgress[sectionID] = true;
            var httpRequest = new gs.functions.ajaxRequest();
            
            var sectionToggle = document.getElementById("toggle" + sectionID);
            sectionToggle.setAttribute("src", gs.imageURLs.loading);

            var url = gs.xsltParams.library_name + "/collection/" + gs.cgiParams.c + "/browse/" + sectionID.replace(/\./g, "/") + "?excerptid=div" + sectionID;

            if(gs.cgiParams.berryBasket == "on")
            {
                url = url + "&berrybasket=on";
            }

            if(url.indexOf("#") != -1)
            {
                url = url.substring(0, url.indexOf("#"));
            }
            httpRequest.open('GET', url, true);
            httpRequest.onreadystatechange = function() 
            {
                if (httpRequest.readyState == 4) 
                {
                    if (httpRequest.status == 200) 
                    {
                        var newDiv = document.createElement("div");                                     
                        var sibling = document.getElementById("title" + sectionID);
                        var parent = sibling.parentNode;
                        if(sibling.nextSibling)
                        {
                            parent.insertBefore(newDiv, sibling.nextSibling);
                        }
                        else
                        {
                            parent.appendChild(newDiv);
                        }
                        
                        newDiv.innerHTML = httpRequest.responseText;
                        sectionToggle.setAttribute("src", gs.imageURLs.collapse);
                        openClassifiers[sectionID] = true;  
                        
                        if(gs.cgiParams.berryBasket == "on")
                        {
                            checkout();
                        }
                        updateOpenClassifiers();
                        getSubClassifier(sectionID);
                    }
                    else
                    {
                        sectionToggle.setAttribute("src", gs.imageURLs.expand);
                    }
                    inProgress[sectionID] = false;
                    busy = false;
                }
            }
            httpRequest.send();
        }
    }
}