#!/usr/bin/perl

use strict;
use warnings;

use LWP::UserAgent;
use JSON::XS;

my $ua = LWP::UserAgent->new();
my $json = JSON::XS->new();
my $location = "https://papillon.john.me.tz/data/location.json";

my $lat_lon = fetch_lat_lon($ua, $json, $location);

my $pid = fork;
unless ($pid) {
    open STDIN,  '/dev/null';
    open STDOUT, '>>/dev/null';
    open STDERR, '>>/dev/null';

    `gammastep -l $lat_lon`;
}

sub fetch_lat_lon {
    my ($ua, $json, $location) = @_;

    my $raw = $ua->get($location)->content();
    if (defined $raw) {
        my $decoded = $json->decode($raw);
        if (defined $decoded->{lat} && defined $decoded->{lon}) {
            return "$decoded->{lat}:$decoded->{lon}";
        }
        print $decoded->{lat};

    }
    sleep 5;
    return fetch_lat_lon($ua, $json, $location);
}

exit;