feat, refac: 매달 실행되는 함수 마저 구현

- NewYear: 새해(AddAge 일부)
- AssignGeneralSpeciality: 특히 부여(AddAge 일부)
- RaiseDisaster
- RandomizeCityTradeRate
- ResetOfficeLock: 구 updateQuaterly

hwe/sammo/Event/Action/RandomizeCityTradeRate.php

@@ -0,0 +1,48 @@
+<?php
+
+namespace sammo\Event\Action;
+
+use DB;
+use sammo\LiteHashDRBG;
+use sammo\RandUtil;
+use sammo\UniqueConst;
+use sammo\Util;
+
+class RandomizeCityTradeRate extends \sammo\Event\Action
+{
+  public function run(array $env)
+  {
+    $year = $env['year'];
+    $month = $env['month'];
+
+    $rng = new RandUtil(new LiteHashDRBG(Util::simpleSerialize(
+      UniqueConst::$hiddenSeed,
+      'randomizeCityTradeRate',
+      $year,
+      $month,
+    )));
+
+    $db = DB::db();
+    foreach ($db->query('SELECT city,level FROM city') as $city) {
+      //시세
+      $prob = [
+        1 => 0,
+        2 => 0,
+        3 => 0,
+        4 => 0.2,
+        5 => 0.4,
+        6 => 0.6,
+        7 => 0.8,
+        8 => 1
+      ][$city['level']];
+      if ($prob > 0 && $rng->nextBool($prob)) {
+        $trade = $rng->nextRangeInt(95, 105);
+      } else {
+        $trade = null;
+      }
+      $db->update('city', [
+        'trade' => $trade
+      ], 'city=%i', $city['city']);
+    }
+  }
+}