common.php

   1 <?php declare(strict_types=1);
   2
   3 require_once('vendor/autoload.php');
   4 require_once(__DIR__ . '/config.php');
   5
   6 use Telegram\Bot\Api;
   7
   8 function getTelegram() {
   9     STATIC $tg;
  10     return $tg = $tg ?? new \Telegram\Bot\Api(BOT_TOKEN);
  11 }
  12
  13 function splitBill($amount) {
  14     return floor($amount/2);
  15 }
  16
  17 function identity($x) {
  18     return $x;
  19 }
  20
  21 function getMessageSender($update) {
  22     return PARTICIPANT_IDS[$update->get('message')->get('from')->get('id')];
  23 }
  24
  25 function getMessageSenderDisplayName($update) {
  26     return $update->get('message')->get('from')->get('first_name');
  27 }
  28
  29 function canChatWith($update) {
  30     return in_array($update->get('message')->get('from')->get('id'), array_keys(PARTICIPANT_IDS));
  31 }
  32
  33 function debug($whatever) {
  34     echo '<pre>';
  35     print_r($whatever);
  36     echo '</pre>';
  37 }
  38
  39 function getInbox($inbox) {
  40     STATIC $inboxes;
  41
  42     if (!isset($inboxes[$inbox])) {
  43         $inboxes[$inbox] = imap_open(
  44             '{imap.gmail.com:993/debug/imap/ssl/novalidate-cert}' . $inbox,
  45             EMAIL,
  46             PASSWORD
  47         );
  48     }
  49
  50     return $inboxes[$inbox];
  51 }
  52
  53 function getRules() {
  54     STATIC $rules;
  55     return $rules = $rules ?? require 'rules.php';
  56 }
  57
  58 function getString($identifier, ...$vars) {
  59     STATIC $strings;
  60     $strings = $strings ?? require 'strings.php';
  61
  62     return sprintf($strings[$identifier], ...$vars);
  63 }
  64
  65 function formatDate($date) {
  66     return $date->format(DATE_FORMAT);
  67 }
  68
  69 const sendToGroupChat = 'sendToGroupChat';
  70 function sendToGroupChat(string $message) {
  71     return getTelegram()->sendMessage(['chat_id' => CHAT_ID, 'text' => $message]);
  72 }
  73
  74 const generateReminderText = 'generateReminderText';
  75 function generateReminderText($message) {
  76     return getString('billreminder', REMIND_THRESHOLD, $message['service'], splitBill($message['amount']), formatDate($message['due']));
  77 }
  78
  79 const generateNewBillText = 'generateNewBillText';
  80 function generateNewBillText($message) {
  81     return getString('newbill', $message['service'], splitBill($message['amount']), formatDate($message['due']));
  82 }
  83
  84 const messageNeedsReminder = 'messageNeedsReminder';
  85 function messageNeedsReminder($message) {
  86     return $message['due']->diff(new DateTimeImmutable)->d == REMIND_THRESHOLD;
  87 }
  88
  89
  90 function ∘(...$fs) {
  91     return function($arg) use ($fs) {
  92         return array_reduce(array_reverse($fs), function($c, $f) {
  93             return $f($c);
  94         }, $arg);
  95     };
  96 }
  97
  98 function map($callable) {
  99     return function($list) use ($callable) {
 100         return array_map($callable, $list);
 101     };
 102 }
 103
 104 function filter($callable) {
 105     return function($list) use ($callable) {
 106         return array_filter($list, $callable);
 107     };
 108 }
 109
 110 function ∪($a, $b) {
 111     return array_merge($a, $b);
 112 }
 113
 114 function getMessagesFromInbox($inbox, array $rules, $unseenOnly = true) {
 115     return array_filter(
 116         array_map(
 117             function($rule, $service) use ($inbox, $unseenOnly) {
 118                 $emails = imap_search($inbox, ['SEEN ', 'UNSEEN '][$unseenOnly] . $rule['imapQuery'], SE_UID);
 119
 120                 if(!$emails) {
 121                     return [];
 122                 }
 123
 124                 $messageTransform = $rule['messageTransform'] ?? 'identity';
 125                 $dateTransform = $rule['dateTransform'] ?? 'identity';
 126
 127                 $body = imap_fetchbody($inbox, $emails[0], '1', FT_UID);
 128                 preg_match($rule['regex'], $messageTransform($body), $matches);
 129
 130                 return [
 131                     'service' => $service,
 132                     'id' => substr(md5($body), 0, 6),
 133                     'uid' => $emails[0],
 134                     'due' => new DateTimeImmutable($dateTransform($matches['due'])),
 135                     'amount' => $matches['amount']
 136                 ];
 137             },
 138             $rules,
 139             array_keys($rules)
 140         ),
 141         function($e) {
 142             return !!$e;
 143         }
 144     );
 145 }