#!/usr/bin/perl
#
# Monitorix - Sends Monitorix monthly reports.
#
# Copyright (C) 2005-2012 by Jordi Sanfeliu <jordi@fibranet.cat>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#

require 5.006;

no strict "vars";
no warnings "once";
#use warnings;
use LWP::UserAgent;
use Getopt::Long;
use MIME::Lite;

use constant SMTP_HOST	=> "localhost";
use constant FROM	=> "noreply\@example.com";
use constant PREFIX	=> "http://127.0.0.1";
use constant SUBJECT	=> "Monitorix: monthly traffic report";

# ========================================================================
# ======  Probably you don't need to touch anything below this line ======
# ========================================================================

my $url;
my $ua;
my (undef, undef, undef, undef, $prev_month, $prev_year) = localtime(time - 3600);

sub adjust($) {
	my $bytes = (shift);
	my $adjust = 0;
	my $b = "  ";

	if($bytes > 0  &&  $bytes < 1048576) {
		$adjust = $bytes/1024;
		$b = "KB";
	}
	if($bytes > 1048576  &&  $bytes < 1073741824) {
		$adjust = $bytes/1024/1024;
		$b = "MB";
	}
	if($bytes > 1073741824  &&  $bytes < 1000000000000) {
		$adjust = $bytes/1024/1024/1024;
		$b = "GB";
	}
	return sprintf("%3u%s", $adjust, $b);
}

GetOptions(
	"host=s"	=> \$opt_host,
	"config=s"	=> \$opt_config,
);
if(!$opt_host || !$opt_config) {
	die("send_reports -h|--host <host> -c|--config <config_file>\n\n");
}
if(!stat($opt_config)) {
	die("can't open file $opt_config.\n");
}
# load configuration file
require $opt_config;


# get the traffic counters
# -----------------------------------------------------------------------------
my @traffic = ();
my $tot_in = 0;
my $tot_out = 0;
my $tot = 0;
open(IN, $USAGE_DIR . $opt_host);
push(@traffic, "DAY              INPUT             OUTPUT                 TOTAL\n");
push(@traffic, "---------------------------------------------------------------\n");
while(<IN>) {
	my ($day, $in, $out) = split(' ', $_);
	chomp($day);
	chomp($in);
	chomp($day);
	$tot_in += $in;
	$tot_out += $out;
	$tot = $in + $out;
	push(@traffic, sprintf("%3u %12u %s %12u %s %15u %s\n", $day, $in, adjust($in), $out, adjust($out), $tot, adjust($tot)));
}
close(IN);
push(@traffic, "---------------------------------------------------------------\n");
$tot = $tot_in + $tot_out;
push(@traffic, sprintf("%16u %s %12u %s %15u %s\n", $tot_in, adjust($tot_in), $tot_out, adjust($tot_out), $tot, adjust($tot)));


# get the recipient's email address
# -----------------------------------------------------------------------------
my %index;
@index{@PC_LIST} = (0 .. $#PC_LIST);
my $i = $index{$opt_host};
my $to_addr = $PC_LIST[$i];
$to_addr = $PC_DEFAULT_MAIL unless $PC_REPORT_MAIL[$i];


# get the Monitorix logo
# -----------------------------------------------------------------------------
$url = PREFIX . $BASE_URL . "/logo_bot.png";
$ua = LWP::UserAgent->new(timeout => 30);
my $logo = $ua->request(HTTP::Request->new('GET', $url));


# get the monthly graph
# -----------------------------------------------------------------------------
$url = PREFIX . $BASE_CGI . "/monitorix.cgi?mode=pc.$i&graph=all&when=month&color=$THEME_COLOR&silent=imagetagbig";
$ua = LWP::UserAgent->new(timeout => 30);
$ua->request(HTTP::Request->new('GET', $url));
$url = PREFIX . $BASE_URL . "/" . $IMGS_DIR . "pc" . $i . ".month.png";
my $graph = $ua->request(HTTP::Request->new('GET', $url));


# create the multipart container, add attachments and send the message
# -----------------------------------------------------------------------------
$msg = new MIME::Lite(
	From		=> FROM,
	To		=> $to_addr,
	Subject		=> SUBJECT . " - $opt_host",
	Type		=> "multipart/related",
	Organization	=> "Monitorix",
);

$msg->attach(
	Type		=> 'text/html',
	Path		=> $PC_REPORT_LANG . '.html',
);
$msg->attach(
	Type		=> 'image/png',
	Id		=> 'image_01',
	Data		=> $logo->content,
);
$msg->attach(
	Type		=> 'image/png',
	Id		=> 'image_02',
	Data		=> $graph->content,
);
$msg->attach(
	Type		=> 'text/plain',
	Id		=> 'text_01',
	Data		=> join("", @traffic),
);

$msg->send('smtp', SMTP_HOST, Timeout => 60);


# rename $opt_host file to avoid reusing
# -----------------------------------------------------------------------------
my $newname = sprintf("%s.%02u-%u", $USAGE_DIR . $opt_host, $prev_month + 1, $prev_year + 1900);
rename($USAGE_DIR . $opt_host, $newname);