src/common.php

   1 <?php declare(strict_types=1);
   2
   3 require_once(__DIR__ . '/config.php');
   4 require_once(AUTOLOAD_PATH);
   5
   6 use Telegram\Bot\Api;
   7
   8 function getTelegram(): \Telegram\Bot\Api {
   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 $x;
  19 }
  20
  21 const notEmpty = 'notEmpty';
  22 function notEmpty($value) {
  23     return !empty($value);
  24 }
  25
  26 function getMessageSender($update) {
  27     return PARTICIPANT_IDS[getMessageSenderId($update)];
  28 }
  29
  30 function getMessageSenderId($update) {
  31     return $update->get('message')->get('from')->get('id');
  32 }
  33
  34 function getMessageSenderDisplayName($update) {
  35     return $update->get('message')->get('from')->get('first_name');
  36 }
  37
  38 function canChatWith($update) {
  39     return in_array($update->get('message')->get('from')->get('id'), array_keys(PARTICIPANT_IDS));
  40 }
  41
  42 function debug($whatever) {
  43     echo '<pre>';
  44     print_r($whatever);
  45     echo '</pre>';
  46 }
  47
  48 function partition(int $numPartitions, $array) {
  49     $partitionSize = (int)ceil(count($array) / $numPartitions);
  50
  51     return
  52         array_values(filter(notEmpty)(
  53             map(function($p) use ($array, $partitionSize) {
  54                 return array_slice($array, $p*$partitionSize, $partitionSize);
  55             })(range(0, $numPartitions-1))
  56         ));
  57 }
  58
  59 function getInbox($inbox) {
  60     STATIC $inboxes;
  61
  62     if (!isset($inboxes[$inbox])) {
  63         $inboxes[$inbox] = imap_open(
  64             '{imap.gmail.com:993/debug/imap/ssl/novalidate-cert}' . $inbox,
  65             EMAIL,
  66             PASSWORD
  67         );
  68     }
  69
  70     return $inboxes[$inbox];
  71 }
  72
  73 function getRules() {
  74     STATIC $rules;
  75     return $rules = $rules ?? require 'rules.php';
  76 }
  77
  78 const getString = 'getString';
  79 function getString($identifier, ...$vars) {
  80     STATIC $strings;
  81     $strings = $strings ?? require 'strings.php';
  82
  83     return isset($strings[$identifier]) ? sprintf($strings[$identifier], ...$vars) : "[[$identifier]]";
  84 }
  85
  86 const getStringAndCode = 'getStringAndCode';
  87 function getStringAndCode($string) {
  88     return getString($string) . " (" . $string . ")";
  89 };
  90
  91 function formatDate($date) {
  92     return $date->format(DATE_FORMAT);
  93 }
  94
  95 function ssort($comparitor) {
  96     return function($array) use ($comparitor) {
  97         uasort($array, uncurry($comparitor));
  98         return $array;
  99     };
 100 }
 101
 102 function uncurry($f) {
 103     return function($a, $b) use ($f) {
 104         return $f($a)($b);
 105     };
 106 }
 107
 108 const sendToGroupChat = 'sendToGroupChat';
 109 function sendToGroupChat(string $message) {
 110     return getTelegram()->sendMessage(['chat_id' => CHAT_ID, 'text' => $message]);
 111 }
 112
 113 const generateReminderText = 'generateReminderText';
 114 function generateReminderText($message) {
 115     return getString('billreminder', REMIND_THRESHOLD, $message['service'], splitBill($message['amount']), formatDate($message['due']));
 116 }
 117
 118 const generateNewBillText = 'generateNewBillText';
 119 function generateNewBillText($message) {
 120     return getString('newbill', $message['service'], splitBill($message['amount']), formatDate($message['due']));
 121 }
 122
 123 const messageNeedsReminder = 'messageNeedsReminder';
 124 function messageNeedsReminder($message) {
 125     return $message['due']->diff(new DateTimeImmutable)->d == REMIND_THRESHOLD;
 126 }
 127
 128 const lines = 'lines';
 129 function lines(string $string): array {
 130     return explode("\n", $string);
 131 }
 132
 133 const glue = 'glue';
 134 function glue(string $delim): callable {
 135     return function(array $strings) use ($delim): string {
 136         return implode($delim, $strings);
 137     };
 138 }
 139
 140 const unlines = 'unlines';
 141 function unlines($lines) {
 142     return implode("\n", $lines);
 143 }
 144
 145 const ununlines = 'ununlines';
 146 function ununlines($lines) {
 147     return implode("\n\n", $lines);
 148 }
 149
 150 const zipWith = 'zipWith';
 151 function zipWith(callable $zipper, array $a, array $b) {
 152     return array_map($zipper, $a, $b);
 153 }
 154
 155 function field($field) {
 156     return function($array) use ($field) {
 157         return $array[$field];
 158     };
 159 }
 160
 161 const ⬄ = '⬄';
 162 function ⬄($a) {
 163     return function($b) use ($a) {
 164         return $a <=> $b;
 165     };
 166 }
 167
 168
 169 function ∘(...$fs) {
 170     return function($arg) use ($fs) {
 171         return array_reduce(array_reverse($fs), function($c, $f) {
 172             return $f($c);
 173         }, $arg);
 174     };
 175 }
 176
 177 function map($callable) {
 178     return function($list) use ($callable) {
 179         return array_map($callable, $list);
 180     };
 181 }
 182
 183 function aaray_column($column) {
 184     return function($array) use ($column) {
 185         return array_column($array, $column);
 186     };
 187 }
 188
 189 function aaray_slice($start) {
 190     return function($length) use ($start) {
 191         return function($array) use ($length, $start) {
 192             return array_slice($array, $start, $length);
 193         };
 194     };
 195 }
 196
 197 function filter($callable) {
 198     return function($list) use ($callable) {
 199         return array_filter($list, $callable);
 200     };
 201 }
 202
 203 function f∘(callable $f) {
 204     return function(callable $g) use ($f) {
 205         return function($arg) use($g, $f) {
 206             return $f($g($arg));
 207         };
 208     };
 209 }
 210
 211 function ∘f(callable $f) {
 212     return function(callable $g) use ($f) {
 213         return function($arg) use($g, $f) {
 214             return $g($f($arg));
 215         };
 216     };
 217 }
 218
 219 function ∪($a, $b) {
 220     return array_merge($a, $b);
 221 }
 222
 223 function getSeason(int $monthNum) {
 224     return ['summer', 'autumn', 'winter', 'spring'][floor(($monthNum%12)/3)];
 225 }
 226
 227 function getMonthName($monthNum) {
 228     return ['january', 'february', 'march', 'april', 'may', 'june', 'july', 'august', 'september', 'october', 'november', 'december'][$monthNum-1];
 229 }
 230
 231 // XXX: Consider renaming these to "is[First/Last]WeekOf[Month/Season]"
 232 function isStartOfSeason($monthNum, $dayNum) {
 233     return ($monthNum)%3 == 0 && isStartOfMonth($dayNum);
 234 }
 235
 236 function isStartOfMonth($dayNum) {
 237     return $dayNum < 8;
 238 }
 239
 240 function isEndOfSeason($yearNum, $monthNum, $dayNum) {
 241     return ($monthNum+1)%3 == 0 && isEndOfMonth($yearNum, $monthNum, $dayNum);
 242 }
 243
 244 function isEndOfMonth($yearNum, $monthNum, $dayNum) {
 245     return $dayNum + 7 > cal_days_in_month(CAL_GREGORIAN, $monthNum, $yearNum);
 246 }
 247
 248 function isEndOfYear($yearNum, $monthNum, $dayNum) {
 249     return $monthNum == 12 && isEndOfMonth($yearNum, $monthNum, $dayNum);
 250 }
 251
 252 function getTasksForTheSeason($season, $taskMatrix) {
 253     return array_unique(
 254         array_reduce(
 255             $taskMatrix['annualy'][$season],
 256             function($c, $v) {
 257                 return array_merge(
 258                     $c,
 259                     array_reduce($v, function($c, $v) {
 260                         return array_merge($c, is_array($v) ? $v : [$v]);
 261                     }, [])
 262                 );
 263             },
 264             []
 265         )
 266     );
 267 }
 268
 269 function getTasksForTheMonth($monthNum, $taskMatrix) {
 270     return array_merge(
 271         $taskMatrix['monthly'],
 272         $monthNum % 6 == 0 ? $taskMatrix['biannualy'] : [],
 273         $monthNum % 3 == 0 ? $taskMatrix['quadriannualy'] : [],
 274         array_filter(
 275             $taskMatrix['annualy'][getSeason($monthNum)][getMonthName($monthNum)],
 276             function($v) {
 277                 return !is_array($v);
 278             }
 279         )
 280     );
 281 }
 282
 283 function getTasksForTheWeek(int $weekNum, int $monthNum, array $taskMatrix) {
 284     return  array_merge(
 285         $weekNum % 2 == 0 ? $taskMatrix['bimonthly'] : [],
 286         $taskMatrix['annualy'][getSeason($monthNum)][getMonthName($monthNum)]['weekly'] ?? [],
 287         partition(4, getTasksForTheMonth($monthNum, $taskMatrix))[$weekNum-1]
 288     );
 289 }
 290
 291 const getFilePathForWeek = 'getFilePathForWeek';
 292 function getFilePathForWeek(int $year, int $monthNum, int $weekNum) {
 293     // December is part of next year's summer
 294     $seasonYear = $year;
 295     return sprintf(
 296         'tasks/%s/%s/%s/week%s.txt',
 297         $seasonYear,
 298         getSeason($monthNum),
 299         getMonthName($monthNum),
 300         $weekNum
 301     );
 302 }
 303
 304 function getFilePathsForMonth(int $year, int $monthNum) {
 305     return map(function($week) use ($year, $monthNum){
 306         return getFilePathForWeek($year, $monthNum, $week);
 307     })(range(1,4));
 308 }
 309
 310 function getFilePathsForSeason(int $year, string $season) {
 311     return array_merge(...map(function($monthNum) use ($year) {
 312         // Summer of the current year includes december of the previous year.
 313         $seasonYear = $year - ($monthNum == 12 ? 1 : 0);
 314         return getFilePathsForMonth($seasonYear, $monthNum);
 315     })(array_filter(range(1,12), function($month) use ($season) {
 316         return getSeason($month) == $season;
 317     })));
 318 }
 319
 320 function getFilePathsForYear(int $year) {
 321     return array_merge(...map(function($season) use ($year) {
 322         return getFilePathsForSeason($year, $season);
 323     })(['summer', 'winter', 'spring', 'autumn']));
 324 }
 325
 326 function closest($n, $list) {
 327     $a = array_filter($list, function($value) use ($n) {
 328         return $value <= $n;
 329     });
 330
 331     arsort($a);
 332     return array_values($a)[0];
 333 }
 334
 335 function reveal($str) {
 336     $lastBytes = array_filter(
 337         (unpack('C*', $str)),
 338         function($key) {
 339             return $key % 4 == 0;
 340         },
 341         ARRAY_FILTER_USE_KEY
 342     );
 343
 344     $penultimateBytes = array_filter(
 345         (unpack('C*', $str)),
 346         function($key) {
 347             return ($key + 1) % 4 == 0;
 348         },
 349         ARRAY_FILTER_USE_KEY
 350     );
 351
 352     return implode('', zipWith(function($byte, $prevByte) {
 353         return chr($byte - ($prevByte == 133 ? 64 : 128));
 354     }, $lastBytes, $penultimateBytes));
 355 }
 356
 357 function hide($str) {
 358     $charBytes = unpack('C*', $str);
 359     return pack(...array_merge(['C*'], array_merge(...map(function($charByte) {
 360         $magic = [243, 160, $charByte < 65 ? 132 : 133];
 361         return array_merge($magic, [$charByte + ($charByte < 65 ? 128 : 64)]);
 362     })($charBytes))));
 363 }
 364
 365 function getMessagesFromInbox($inbox, array $rules, $unseenOnly = true) {
 366     return array_filter(
 367         array_map(
 368             function($rule, $service) use ($inbox, $unseenOnly) {
 369                 $emails = imap_search($inbox, ['SEEN ', 'UNSEEN '][$unseenOnly] . $rule['imapQuery'], SE_UID);
 370
 371                 if(!$emails) {
 372                     return [];
 373                 }
 374
 375                 $messageTransform = $rule['messageTransform'] ?? 'identity';
 376                 $dateTransform = $rule['dateTransform'] ?? 'identity';
 377
 378                 $body = quoted_printable_decode(imap_fetchbody($inbox, $emails[0], '1', FT_UID));
 379                 preg_match($rule['regex'], $messageTransform($body), $matches);
 380
 381                 return [
 382                     'service' => $service,
 383                     'id' => substr(md5($body), 0, 6),
 384                     'uid' => $emails[0],
 385                     'due' => new DateTimeImmutable($dateTransform($matches['due'])),
 386                     'amount' => $matches['amount']
 387                 ];
 388             },
 389             $rules,
 390             array_keys($rules)
 391         ),
 392         function($e) {
 393             return !!$e;
 394         }
 395     );
 396 }