<?php
/**
 * DynamicPageList3
 * DPL Variables Class
 *
 * @author		IlyaHaykinson, Unendlich, Dangerville, Algorithmix, Theaitetos, Alexia E. Smith
 * @license		GPL-2.0-or-later
 * @package		DynamicPageList3
 *
 **/
namespace DPL;

class Variables {
	/**
	 * Memory storage for variables.
	 *
	 * @var		array
	 */
	static public $memoryVar = [];

	/**
	 * Memory storage for arrays of variables.
	 *
	 * @var		array
	 */
	static public $memoryArray = [];

	// expects pairs of 'variable name' and 'value'
	// if the first parameter is empty it will be ignored {{#vardefine:|a|b}} is the same as {{#vardefine:a|b}}
	public static function setVar($arg) {
		$numargs = count($arg);
		if ($numargs >= 3 && $arg[2] == '') {
			$start = 3;
		} else {
			$start = 2;
		}
		for ($i = $start; $i < $numargs; $i++) {
			$var = $arg[$i];
			if (++$i <= $numargs - 1) {
				self::$memoryVar[$var] = $arg[$i];
			} else {
				self::$memoryVar[$var] = '';
			}
		}
		return '';
	}

	public static function setVarDefault($arg) {
		$numargs = count($arg);
		if ($numargs > 3) {
			$value = $arg[3];
		} else {
			return '';
		}
		$var = $arg[2];
		if (!array_key_exists($var, self::$memoryVar) || self::$memoryVar[$var] == '') {
			self::$memoryVar[$var] = $value;
		}
		return '';
	}

	public static function getVar($var) {
		if (array_key_exists($var, self::$memoryVar)) {
			return self::$memoryVar[$var];
		}
		return '';
	}

	public static function setArray($arg) {
		$numargs = count($arg);
		if ($numargs < 5) {
			return '';
		}
		$var       = trim($arg[2]);
		$value     = $arg[3];
		$delimiter = $arg[4];
		if ($var == '') {
			return '';
		}
		if ($value == '') {
			self::$memoryArray[$var] = [];
			return;
		}
		if ($delimiter == '') {
			self::$memoryArray[$var] = [
				$value
			];
			return;
		}
		if (0 !== strpos($delimiter, '/') || (strlen($delimiter) - 1) !== strrpos($delimiter, '/')) {
			$delimiter = '/\s*' . $delimiter . '\s*/';
		}
		self::$memoryArray[$var] = preg_split($delimiter, $value);
		return "value={$value}, delimiter={$delimiter}," . count(self::$memoryArray[$var]);
	}

	public static function dumpArray($arg) {
		$numargs = count($arg);
		if ($numargs < 3) {
			return '';
		}
		$var  = trim($arg[2]);
		$text = " array {$var} = {";
		$n    = 0;
		if (array_key_exists($var, self::$memoryArray)) {
			foreach (self::$memoryArray[$var] as $value) {
				if ($n++ > 0) {
					$text .= ', ';
				}
				$text .= "{$value}";
			}
		}
		return $text . "}\n";
	}

	public static function printArray($var, $delimiter, $search, $subject) {
		$var = trim($var);
		if ($var == '') {
			return '';
		}
		if (!array_key_exists($var, self::$memoryArray)) {
			return '';
		}
		$values          = self::$memoryArray[$var];
		$rendered_values = [];
		foreach ($values as $v) {
			$temp_result_value = str_replace($search, $v, $subject);
			$rendered_values[] = $temp_result_value;
		}
		return [
			implode($delimiter, $rendered_values),
			'noparse'	=> false,
			'isHTML'	=> false
		];
	}
}