Firebase function to search

const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp(functions.config().firebase);
// // Create and Deploy Your First Cloud Functions
// // https://firebase.google.com/docs/functions/write-firebase-functions
//
// exports.helloWorld = functions.https.onRequest((request, response) => {
//  response.send("Hello from Firebase!");
// });

// Docs: https://firebase.google.com/docs/functions/http-events
// use this for calling this function: curl -X POST -H "Content-Type:application/json"  -d '{"city":"Naples"}' https://us-central1-sportme-4e614e.cloudfunctions.net/getMatch?city=Naples
exports.getMatch = functions.https.onRequest((req,res) => {
    const myCity = req.query.city
    console.log("Matching for my city: " + myCity)
    b = [ 5, 5 ]
    var match = []
    admin.database().ref().child('users/').once('value').then(function(snapshot) {
        //for ( u in snapshot.val() ) {
        snapshot.forEach(function(user){
            //console.log( user.key )
            //console.log( user.val() )
            // Only matches people from my city
            //console.log("  - " + user.val().city )
            if ( myCity.localeCompare( user.val().city ) == 0 ) {
                var x = b[0]*user.val().fitness + b[1]*user.val().goal
                var obj = { mVal: x, user: user.key }
                //console.log("  ++ " + obj)
                match.push( obj )
                //console.log(match)
            }
            //})
        })
        match.sort(function(a,b){
            return a.mVal < b.mVal
        })
        //console.log(match)

        res.status(200).send(match)
    })
    //console.log("match result" + match)
})

//TODO: when matching by tags, if there's no match, just proceed with matching by city