#!/usr/bin/perl -w
#
# handlemail-support:
# Handle an individual incoming mail message.
#
# This script should be invoked through the .forward mechanism. It processes
# emails to the support address to remove out of office and so on, before
# forwarding on.
#
# Copyright (c) 2013 UK Citizens Online Democracy. All rights reserved.
# Email: matthew@mysociety.org; WWW: http://www.mysociety.org/

use strict;
require 5.8.0;

# Horrible boilerplate to set up appropriate library paths.
use FindBin;
use lib "$FindBin::Bin/../perllib";
use lib "$FindBin::Bin/../commonlib/perllib";

use mySociety::Config;
BEGIN {
    mySociety::Config::set_file("$FindBin::Bin/../conf/general");
}
use mySociety::EmailUtil;
use mySociety::HandleMail;

my %data = mySociety::HandleMail::get_message();
exit 0 if is_ignorable($data{message});
forward_on();

# ---

sub forward_on {
    my ($l, $d) = split /\@/, mySociety::Config::get('CONTACT_EMAIL');
    if (mySociety::EmailUtil::EMAIL_SUCCESS
            != mySociety::EmailUtil::send_email(
                join("\n", @{$data{lines}}) . "\n",
                $data{return_path},
                join('@', join('_deli', $l, 'very'), $d)
            )) {
        exit 75;
    }
    exit 0;
}

sub is_ignorable {
    my $m = shift;
    my $head = $m->head();
    my ($from, $subject, $body) = ($head->get('From'), $head->get('Subject'), $m->body);
    $body = join("\n", @$body);

    open my $fp, "$FindBin::Bin/../../data/ignored-emails.csv" or exit 75;
    while (<$fp>) {
        chomp;
        my ($f, $s, $b) = split /,/;
        next unless $f || $s || $b;
        return 1 unless ( $f && $from !~ /$f/ ) || ( $s && $subject !~ /$s/ ) || ( $b && $body !~ /$b/ );
    }
    return 0;
}