Random.php
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	<?php
	declare(strict_types=1);

	namespace Keruald\OmniTools\Identifiers;

	use Closure;
	use InvalidArgumentException;

	class Random {

	/**
	* @return string 32 random hexadecimal characters
	*/
	public static function generateHexHash () : string {
	return UUID::UUIDv4WithoutHyphens();
	}

	/**
	* @param string $format A for letters, 1 for digits, e.g. AAA111
	*
	* @return string a random string based on the format e.g. ZCK530
	*/
	public static function generateString (string $format) : string {
	$randomString = "";

	$len = strlen($format);
	for ($i = 0 ; $i < $len ; $i++) {
	$randomString .= self::generateCharacter($format[$i]);
	}

	return $randomString;
	}

	/**
	* @param string $format A for letters, 1 for digits, e.g. A
	*
	* @return string a random string based on the format e.g. Z
	*/
	public static function generateCharacter (string $format) : string {
	return self::getPicker(self::normalizeFormat($format))();
	}

	///
	/// Helper methods for pickers
	///

	public static function normalizeFormat (string $format) : string {
	$normalizers = self::getNormalizers();

	foreach ($normalizers as $normalizedFormat => $conditionClosure) {
	if ($conditionClosure($format)) {
	return (string)$normalizedFormat;
	}
	}

	return $format;
	}

	private static function getNormalizers () : array {
	/**
	* <normalized format> => <method which returns true if format matches>
	*/

	return [

	'A' => function ($format) : bool {
	return ctype_upper($format);
	},

	'a' => function ($format) : bool {
	return ctype_lower($format);
	},

	'1' => function ($format) : bool {
	return is_numeric($format);
	},

	];
	}

	private static function getPickers () : array {
	return [

	'A' => function () : string {
	return Random::pickLetter();
	},

	'a' => function () : string {
	return strtolower(Random::pickLetter());
	},

	'1' => function () : string {
	return (string)Random::pickDigit();
	},

	];
	}

	public static function pickLetter () : string {
	$asciiCode = 65 + mt_rand() % 26;

	return chr($asciiCode);
	}

	public static function pickDigit (int $base = 10) : int {
	return mt_rand() % $base;
	}

	private static function getPicker (string $format) : Closure {
	$pickers = self::getPickers();

	if (isset($pickers[$format])) {
	return $pickers[$format];
	}

	throw new InvalidArgumentException();
	}

	}

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