<?php

require_once "Mail.php";
$smtp = Mail::factory(
  "smtp", array(
  "auth" => true, // wichtig!
  "host" => "smtp.ionos.de",
  "port" => "587",
  "username" => "xxx",
  "password" => "xxx"));

$json_stat_name = "/var/www/tm-freifunk/wd_stat.json";

if (! file_exists($json_stat_name))
  create_json_sample();
  check_hosts();
exit;

//------------------------------------------------------------

function check_hosts() {
  global $json_stat_name;
  $hosts = read_json();
  $update = false;
  foreach ($hosts as &$host) {
    if (array_key_exists('ignore', $host))
      if ($host['ignore'])
	continue;
    if (array_key_exists('watchstart', $host))
      if (array_key_exists('watchend', $host))
	if ( (time() < strtotime($host['watchstart'])) ||
	  (time() > strtotime($host['watchend'])) )
	  continue;
    $lastseen = strtotime($host['lastseen']);
    $timedout = strtotime($host['timeout'], $lastseen);
    $offline = ($timedout < time());
    $statechanged = ($offline != $host['wasoffline']);
    if ($statechanged) {
      $update = true; // write changes to file
      $host['wasoffline'] = $offline;
      if ($offline) {
	$subj = "OFFLINE: ".$host['hostname'];
	$body = 'Please check your device: ' . $host['hostname'] . "!";
      } else {
	$subj = "ONLINE: ".$host['hostname'];
	$body = 'Device is online again: ' . $host['hostname'] . ".";
      }
      send_mail($host['mailto'], $host['mailfrom'], $subj, $body);
    }
  }
  if ($update)
    file_put_contents($json_stat_name,
      json_encode($hosts, JSON_PRETTY_PRINT));
}

function read_json() {
  global $json_stat_name;
  $content = file_get_contents($json_stat_name);
  return json_decode($content, true);
}

function send_mail($mailto, $mailfrom, $mailsubj, $mailbody) {
  global $smtp;
  echo "send mail\n";
  $mailheader = array(
    "Content-Type" => "text/plain; charset=\"UTF-8\"",
    "From" => $mailfrom,
    "To" => $mailto,
    "Subject" => $mailsubj);
  $mail = $smtp->send($mailto, $mailheader, $mailbody);
  if (PEAR::isError($mail)) {
    echo "error: " . $mail->getMessage() . "\n";
  }
  # if not using PEAR::Mail, setup a local MTA
  #$mailhead='Content-Type: text/plain; charset="UTF-8"' . "\r\n"
  #  . "From: $mailfrom" . "\r\n";
  #if (! mail ($mailto, $mailsubj, $mailbody, $mailhead))
  #  echo "error";
}

// create a sample file
function create_json_sample() {
  global $json_stat_name;
  $host = array(
    "hostname" => "host",
    "lastseen" => date("Y-m-d H:i:s", strtotime('-2 hour')),
    "wasoffline" => false,
    "mailto" => "name@mail.tld",
    "mailfrom" => '"FF-Watchdog" <name@mail.tld>',
    "ignore" => false,
    "timeout" => "+1 hour",
    "watchstart" => "00:00:00",
    "watchend" => "23:59:59"
  );
  $arr = array($host, $host);
  $json = json_encode($arr, JSON_PRETTY_PRINT);
  file_put_contents($json_stat_name, $json);
}

?>