#!/usr/bin/perl
# caffeine_deposit.pl
# Written by akreher2 on April 27th, 2009

use strict;
use warnings;
use LWP::Debug ();

# LWP::Authen::Negotiate is the Perl module that makes kerberos authenitcation
# magically work

my $URL    = 'https://www-s.acm.uiuc.edu/caffeine';

# Argument handling
die "Usage: $0 netid amount\n" unless @ARGV == 2;

my $to     = shift;
my $amount = shift;

unless ($amount =~ /^-?\d+(?:\.\d{1,2})?$/) {
	die "amount ($amount) does not look like a valid number.\n";
}

use Term::ReadKey 'ReadMode';
use WWW::Mechanize;

print "Deposit: \$$amount -> '$to'\n";

# Fetch the main page
my $mech = WWW::Mechanize->new(autocheck => 1, agent => 'Caffeinator');

# Try to automatically log in, otherwise prompt for use
eval {
	$mech->get("$URL/user");
};
if ($@ && $@ =~ /authorization \s+ required/xi) {
	# authorization failed. we probably don't have tickets,
	# so we'll prompt the user for information and use that for authorization.
	print "Kerberos auth failed.\nEnter your netid: ";
	my $netid = <STDIN>;
	chomp $netid;

	print "Enter your ACM Linux password (echo off): ";
	ReadMode('noecho');
	my $passwd = <STDIN>;
	chomp $passwd;
	ReadMode('restore');
	print "\n";

	$mech->credentials($netid, $passwd);
	$mech->get("$URL/user");
} elsif ($@){ # some other error
	die $@;
}

# Make sure we can deposit stuff
unless ($mech->content =~ /admin \s+ operations/xi) {
	die "You are not a caffeine admin.\n";
}

# Look up the user
$mech->submit_form(
	form_name => 'lookupuser',
	fields    => {
		user => $to,
	},
);

if ($mech->content =~ /Unknown \s+ user/xi) {
	die "netid($to) is not valid\n";
}

# Print out the current balance
{
	my($balance) = $mech->content =~ m{balance</td><td>\$([\d\.\-]+)}i;
	print "$to currently has $balance on caffeine.\n";
}

# Deposit the money
$mech->submit_form(
	form_name => 'depositmoney',
	fields    => {
		cash => $amount,
	},
);

{
	my($balance) = $mech->content =~ m{balance</td><td>\$([\d\.\-]+)}i;
	print "$to now has $balance on caffeine.\n";
}