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<?php |
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/** |
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* Created by Gorlum 17.02.2018 23:55 |
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*/ |
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namespace Common; |
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/** |
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* Class OutcomeManager |
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* |
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* Manage outcomes for a bunch of random cases |
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* |
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* @package Common |
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*/ |
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class OutcomeManager implements \Countable { |
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/** |
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* Possible outcomes |
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* |
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* @var array $outcomes |
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*/ |
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protected $outcomes = []; |
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/** |
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* Chances for outcome to roll |
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* |
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* @var int[] $chances |
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*/ |
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protected $chances = []; |
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public function __construct() { |
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} |
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/** |
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* Roll element from predefined array |
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* |
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* @param iterable|array $iterable - [P_CHANCE => (int), ...(payload)] |
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* |
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* @return mixed|null |
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*/ |
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public static function rollArray($iterable) { |
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if (!is_iterable($iterable) || empty($iterable)) { |
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return null; |
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} |
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$manager = new static(); |
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foreach ($iterable as $element) { |
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if (!is_array($element) || empty($element[P_CHANCE])) { |
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continue; |
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} |
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$manager->add($element, $element[P_CHANCE]); |
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} |
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$result = $manager->rollOutcome(); |
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unset($manager); |
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return $result; |
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} |
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/** |
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* Adds outcome to internal array |
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* |
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* @param mixed $outcome - Outcome which can be selected |
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* @param int $chance - Chance of this particular outcome. Should be integer. Sum of all chances can be above mt_getrandmax() |
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*/ |
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public function add($outcome, $chance) { |
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$this->outcomes[] = $outcome; |
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$this->chances[] = $chance; |
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} |
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/** |
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* Removed outcome from list |
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* |
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* @param mixed $outcome - Outcome to be removed |
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* @param bool|null $strict - Strict search flag |
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*/ |
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public function remove($outcome, $strict = null) { |
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if (($index = array_search($outcome, $this->outcomes, $strict)) !== false) { |
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unset($this->outcomes[$index]); |
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unset($this->chances[$index]); |
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} |
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} |
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/** |
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* Get max range of all current outcomes to use as maximum in mt_rand() |
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* |
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* @return float|int |
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*/ |
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public function getMaxRange() { |
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return array_sum($this->chances); |
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} |
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/** |
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* Get outcome by rolled chance |
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* |
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* @param int $rolled - Rolled chance |
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* |
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* @return mixed|null - (null) if no outcomes |
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*/ |
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public function getOutcome($rolled) { |
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foreach ($this->chances as $index => $chance) { |
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if ($rolled <= $chance) { |
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break; |
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} |
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$rolled -= $chance; |
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} |
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return array_key_exists($index, $this->outcomes) ? $this->outcomes[$index] : null; |
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} |
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/** |
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* All-in-one function |
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* |
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* Code can use this function if it don't want to know what number was rolled |
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* |
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* @return mixed|null |
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*/ |
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public function rollOutcome() { |
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return $this->getOutcome(mt_rand(1, $this->getMaxRange())); |
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} |
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/** |
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* Count elements of an object |
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* @link http://php.net/manual/en/countable.count.php |
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* @return int The custom count as an integer. |
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* </p> |
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* <p> |
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* The return value is cast to an integer. |
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* @since 5.1.0 |
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*/ |
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public function count() { |
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return count($this->outcomes); |
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} |
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} |
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supernova-ws /
SuperNova
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