#!/usr/bin/env perl
# weather_watch.pl
use strict;
use Getopt::Long;
use JSON::XS;
use LWP::Simple;
use Sys::Syslog;

my $app = bless { 
    city => 'London,uk',
};

GetOptions(
    $app,
    'city=s',
);

$app->init;
$app->run;

sub init {
    my ($app) = @_;

    openlog($0, 'pid', 'user');
    syslog("info", "Starting up");
    $SIG{TERM} = sub {
        $app->{should_stop} = 1;
    };
}

sub run {
    my ($app) = @_;

    my $url = "http://api.openweathermap.org/data/2.5/weather?q=$app->{city}";
    until ( $app->{should_stop} ) {
        if ( my $json = get($url) ) {
            my $data = decode_json($json);
            syslog("info", "Temperature is $data->{main}{temp}");
            syslog("info", "Wind speed is $data->{wind}{speed}");
        }
        sleep 5;        
    }
    syslog("info", "Shutting down");
    closelog();
}