#!/usr/pkg/bin/perl

use WWW::Mechanize;
local $mech = WWW::Mechanize->new();

my $configfile = $ARGV[0];

error("Usage: $0 configfile") unless defined($configfile);

open CONFIG, "<$configfile" or die $!;

while (<CONFIG>)
{
    chomp;
    # no newline
    s/#.*//;
    # no comments
    s/^\s+//;
    # no leading white
    s/\s+$//;
    # no trailing white
    next unless length;
    # anything left?
    my ($var, $value) = split(/\s*=\s*/, $_, 2);
    $options{$var} = $value;
} 

close CONFIG;

$username = $options{'username'};
error("username not set") unless defined($username);

$password = $options{'password'};
error("password not set") unless defined($password);

$downloaddir = $options{'downloaddir'};
error("downloaddir not set") unless defined($downloaddir);

print "Fetching homepage\n";
$mech->get("https://www.orange.co.uk/");

$mech->follow_link( text_regex => qr/mobile account/ );

print "Logging in\n";

$mech->submit_form(
	form_number => 1,
	fields      => {
		LOGIN     => $username,
		PASSWORD  => $password,
	}
);

# Stupid JavaScript here to submit the form on loading of the page.
# Just log in.

print "Following intermediate login form\n";

$mech->submit_form(
	form_number => 1,
	fields      => {
	}
);

follow_processing();

print "Following view your bills link\n";

$mech->follow_link( text_regex => qr/view your bills/ );

follow_processing();

my @links = $mech->find_all_links( text_regex => qr/download PDF/ );
for $link (@links) {
    my $url = $link->url();
    my ($invoice) = $url =~ /leg_invoice=(\d+)/;
    my $filename = $downloaddir . '/' . $invoice . ".pdf";
    unless (-e $filename) {
	print "Downloading invoice $invoice to $filename\n";
        downloadbill($url, $filename);
        #$mech->mirror($url, $filename);
    } else {
	print "Skipping download of invoice $invoice\n";
    }
}

sub follow_processing {
    my $url, $attempts;

    $attempts = 0;

    while ($attempts < 10) {
	$attempts++;
        ($url) = $mech->content() =~ /var sURL = "(.*)";/;

        return unless defined($url);

	sleep(1);

        $url =~ s/&amp;/&/g;

	print "Waiting for processing. Attempt $attempts.\n";

        my $newurl = $mech->uri();

        $newurl =~ s/\/[^\/]*$//;
        $newurl = $newurl . "/" . $url;

        $mech->get($newurl);
        print "Processing finished.\n";
    }
}

sub downloadbill {
    my ($url, $filename) = @_;

    print "Following download link\n";
    $mech->get($url);
    follow_processing();
    print "Following View your bill link\n";
    my $billlink = $mech->find_link( text_regex => qr/View your bill/ );
    if (!defined($billlink)) {
	print "Unable to download bill\n";
	return;
    }
    my $billurl = $billlink->url_abs();
    print "Downloading bill\n";
    $mech->mirror($billurl, $filename);
}

sub error {
    my ($error) = @_;
    print STDERR $error;
    print STDERR "\n";
    exit 1;
}