-(void)viewDidLoad{

    [self queryFifeScoresForTopUsers];

}

//Queries the Scores object in Firebase and sorts them based on the score key
-(void)queryFifeScoresForTopUsers {

    [self.topUsersArray removeAllObjects];

    FIRDatabaseQuery *sortedRef = [[[[[FIRDatabase database] reference] child:@"Scores"] queryOrderedByChild:@"fifeScore"] queryLimitedToLast:5];

    [sortedRef observeSingleEventOfType:FIRDataEventTypeValue withBlock:^(FIRDataSnapshot *snapshot) {

        if(snapshot.exists){

            for(NSMutableDictionary *object in [snapshot.value allValues]){

                [self.topUsersArray addObject:object];

                [self loadTopUsersForFriendSuggestions];

                NSSortDescriptor *sortDescriptor = [NSSortDescriptor sortDescriptorWithKey:@"fifeScore" ascending:NO];
                NSArray *arrayOfDescriptors = [NSArray arrayWithObject:sortDescriptor];

                [self.topUsersArray sortUsingDescriptors: arrayOfDescriptors];

            }

            [self setupUidArray];
        }
    }];
}

//Adds the uid from each object in self.topUsersArray into a new array self.uidArray
-(void)setupUidArray{

    for (NSMutableDictionary *object in self.topUsersArray){

        NSString *uid = [object objectForKey:@"uid"];

        if (uid){
            [self.uidArray addObject:uid];
        }
    }

}

//Queries all users, loops through each object, adds object to self.suggestedUsersArray if they match
-(void)loadTopUsersForFriendSuggestions{

    FIRDatabaseReference *userRef = [[[FIRDatabase database] reference] child:@"Users"];

    [userRef observeSingleEventOfType:FIRDataEventTypeValue withBlock:^(FIRDataSnapshot * _Nonnull snapshot) {
        if (snapshot.exists){

            for (NSString *uid in [snapshot.value allKeys]){

                if([self.uidArray containsObject:uid]) {

                    [self.suggestedUsersArray addObject:[snapshot.value objectForKey:uid]];
                    NSLog(@"%@",uid);

                }
            }

        }
    }];
}