#! /usr/bin/env perl

use strict;
use URI::Escape;
use LWP::UserAgent;

#my $outfile = shift;
my $date1 = shift;
my $date2 = shift;

my $url = "http://maewest.gso.uri.edu/cgi-bin/nph-jg/htnfronts.ascii?time";

# Save page to file
my $ua = init_lwp();
my $uri = create_query($url, $date1, $date2);
my $resp = execute_query($ua, $uri);

chomp $resp;
print $resp;  # print list to screen of available dates.
print "Choose a date and enter it on the command line: ";
 
sub init_lwp {
  my $ua = LWP::UserAgent->new;
  $ua->env_proxy();
  return $ua;
}

sub create_query {
  my($base_url, $dt1, $dt2) = @_;
  my $url = $base_url;

  if (defined($dt2)) {
    $url .= "&time>=$dt1&time<=$dt2";
  } #else {
  #  $url .= "?time=$dt1";
  #}

  my $uri = URI->new($url);

  # Force unescape to prevent unwanted escapes of < and >
  ${$uri} = uri_unescape(${$uri});

  return $uri;
}

sub execute_query {
  my($ua, $uri, $file) = @_;

  my $request = HTTP::Request->new('GET', $uri);
  my $response = $ua->request($request);
  return $response->as_string();
 
}