contruct_files_and_markdown_properties

// Construct custom Spark Message for Follow Client Tracking
// Build custom Google PATH to create uncerntainty circle

// Your Google Static Map API Key 
var googleApi = '< Google API Key >';

// Google Static Maps Path Circle Function
// Ref: borland592:https://stackoverflow.com/questions/7316963/drawing-a-circle-google-static-maps/35660617#35660617
function GMapCircle(lat,lng,rad,detail=8){

    // Customise your Static Map parameters 
    var uri = 'https://maps.googleapis.com/maps/api/staticmap?';
    var staticMapSrc = 'center=' + lat + ',' + lng;
    staticMapSrc += '&zoom=19';
    staticMapSrc += '&scale=2';
    staticMapSrc += '&size=640x400';
    staticMapSrc += '&maptype=roadmap';
    staticMapSrc += '&key='+googleApi;
    staticMapSrc += '&format=jpg';
    staticMapSrc += '&path=color:0x29fd2f|weight:3|fillcolor:0x29fd2f33';

    var r    = 6371;
    var pi   = Math.PI;
    var _lat  = (lat * pi) / 180;
    var _lng  = (lng * pi) / 180;
    var d    = (rad/1000) / r;

    var i = 0;
    for(i = 0; i <= 360; i+=detail) {
        var brng = i * pi / 180;

        var pLat = Math.asin(Math.sin(_lat) * Math.cos(d) + Math.cos(_lat) * Math.sin(d) * Math.cos(brng));
        var pLng = ((_lng + Math.atan2(Math.sin(brng) * Math.sin(d) * Math.cos(_lat), Math.cos(d) - Math.sin(_lat) * Math.sin(pLat))) * 180) / pi;
            pLat = (pLat * 180) / pi;

        staticMapSrc += "|" + pLat + "," + pLng;
    }

// Add Marker to Map
if (msg.payload.type == "wireless") {
    staticMapSrc += '&markers=color:0xea4335|label:W|'+lat +','+ lng;
} else {
    staticMapSrc += '&markers=color:0x4285f4|label:B|'+lat +','+ lng;
}

// Return custom map URI
return uri + encodeURI(staticMapSrc);}

// Pass Scanning API parameters to GMapCircle Function
var staticMap = GMapCircle(msg.payload.lat,msg.payload.lng,msg.payload.unc,detail=8);

// Build markdown payload
if (msg.payload.type == "wireless") {
    // Render wireless markdown
    msg.payload.markdown = '**Following Wireless Client**<br>' + 
                       '**Name:** ' + msg.payload.name +
                       '<br>**First Seen:** ' + msg.payload.cfirstseen + 
                       '<br>**Last Seen:** ' + msg.payload.clastseen +
                       '<br>**Latitude:** ' + msg.payload.lat + 
                       '<br>**Longitude:** ' + msg.payload.lng +
                       '<br>**IP:** ' + msg.payload.ipv4 +
                       '<br>**MAC:** ' + msg.payload.mac +
                       '<br>**Manufacturer:** ' + msg.payload.manufacturer + 
                       '<br>**OS:** ' + msg.payload.os +
                       '<br>**RSSI:** ' + msg.payload.rssi + 
                       '<br>**SSID:** ' + msg.payload.ssid;
    } else {
    // Render bluetooth markdown string
    msg.payload.markdown = '**Following Bluetooth Client**<br>' + 
                       '**Name:** ' + msg.payload.name +
                       '<br>**First Seen:** ' + msg.payload.cfirstseen +
                       '<br>**Last Seen:** ' + msg.payload.clastseen +
                       '<br>**Latitude:** ' + msg.payload.lat + 
                       '<br>**Longitude:** ' + msg.payload.lng + 
                       '<br>**MAC:** ' + msg.payload.mac + 
                       '<br>**RSSI:** ' + msg.payload.rssi;
}

// Build Camera String for Spark Post based on tag
if (msg.payload.tag.indexOf('front') >= 0) {
    msg.payload.markdown = msg.payload.markdown + '<br>**Camera:** ' + 'https://<shard>.meraki.com/<network>/n/<group>/manage/nodes/new_list/<node A>?timestamp=' + msg.payload.epoch;
}
if (msg.payload.tag.indexOf('rear') >= 0) {
    msg.payload.markdown = msg.payload.markdown + '<br>**Camera:** ' + 'https://<shard>.meraki.com/<network>/n/<group>/manage/nodes/new_list/<node B>?timestamp=' + msg.payload.epoch;
}
if (msg.payload.tag.indexOf('hall') >= 0) {
    msg.payload.markdown = msg.payload.markdown + '<br>**Camera:** ' + 'https://<shard>.meraki.com/<network>/n/<group>/manage/nodes/new_list/<node C>?timestamp=' + msg.payload.epoch;
}


// Render files string
msg.payload.files = staticMap;

return msg;