<?php

namespace Automad\Engine;

use Automad\Core\Debug;
use Automad\Core\Str;

/**
 * The Pipe class handles the chain of processes to manipulate variable values.
 *
 * @author Marc Anton Dahmen
 * @copyright Copyright (c) 2016-2023 by Marc Anton Dahmen - https://marcdahmen.de
 * @license MIT license - https://automad.org/license
 */
class Pipe
{
	/** Whitelist of standard PHP functions. */
	private static array $phpFunctions = array(
		'ceil',
		'floor',
		'round',
		'strlen',
		'strtolower',
		'strtoupper',
		'ucwords'
	);


	/**
	 * Processes an array of functions applied to a given value.
	 *
	 * $functions is an array of associative arrays with function name and parameters.
	 * In case the function name is a mathematical operator,
	 * the value is just the numeric value instead of an array.
	 *
	 * @param string $value
	 * @param array $functions
	 * @return string The modified $value
	 */
	public static function process(string $value, array $functions): string
	{
		Debug::log($functions);

		foreach ($functions as $function) {
			if (preg_match('/^[\+\/\*\-]$/', $function['name'])) {
				$value = Pipe::math($function['name'], $function['parameters'], $value);
			} else {
				$value = Pipe::stringFunction($function['name'], $function['parameters'], $value);
			}
		}

		return $value;
	}


	/**
	 * Call custom string function.
	 *
	 * @param string $function
	 * @param array $parameters
	 * @param string $value
	 * @return string $value
	 */
	private static function extension(string $function, array $parameters, string $value): string
	{
		$class = '\\' . str_replace('/', '\\', $function);

		if (!class_exists($class, false)) {
			$file = strtolower(AM_BASE_DIR . AM_DIR_PACKAGES . '/' . $function . '/' . basename($function) . '.php');

			if (is_readable($file)) {
				require_once($file);
			}
		}

		if (class_exists($class)) {
			$object = new $class();
			$method = basename($function);

			if (method_exists($class, $method)) {
				$value = strval(call_user_func_array(array($object, $method), $parameters));
				Debug::log(array('Result' => $value, 'Parameters' => $parameters), 'Call ' . $function);
			}
		}

		return $value;
	}


	/**
	 * Simple math operations.
	 *
	 * @param string $operator
	 * @param string $number
	 * @param string $value
	 * @return string $value
	 */
	private static function math(string $operator, string $number, string $value): string
	{
		$number = floatval($number);
		$value = floatval($value);
		$result = $value;

		switch ($operator) {
			case '+':
				$result = $value + $number;

				break;
			case '-':
				$result = $value - $number;

				break;
			case '*':
				$result = $value * $number;

				break;
			case '/':
				$result = $value / $number;

				break;
		}

		Debug::log($result, $value . $operator . $number);

		return strval($result);
	}


	/**
	 * Apply string function to $value.
	 *
	 * @param string $function
	 * @param array $parameters
	 * @param string $value
	 * @return string $value
	 */
	private static function stringFunction(string $function, array $parameters, string $value = ''): string
	{
		if (!$parameters) {
			$parameters = array();
		}

		// Add the actual $value to the parameters array as its first element.
		$parameters = array_merge(array(0 => $value), $parameters);

		// Call a String class method.
		if (method_exists('\Automad\Core\Str', $function)) {
			$value = call_user_func_array('\Automad\Core\Str::' . $function, $parameters);
			Debug::log(array('Result' => $value, 'Parameters' => $parameters), 'Call Str::' . $function);

			return $value;
		}

		// Call standard PHP string function.
		if (in_array(strtolower($function), Pipe::$phpFunctions)) {
			$value = strval(call_user_func_array($function, $parameters));
			Debug::log(array('Result' => $value, 'Parameters' => $parameters), 'Call ' . $function);

			return $value;
		}

		// In case $function is a number, call Str::shorten() method and pass $function as paramter
		// for the max number of characters.
		if (is_numeric($function)) {
			Debug::log($value, 'Shorten content to max ' . $function . ' characters');

			return Str::shorten($value, (int) $function);
		}

		// Loading custom string functions as extensions.
		return self::extension($function, $parameters, $value);
	}
}
__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----OTg1MTE2ODk2MTk3ODg5NiA1ODM3ODE4NTc1Mzk0MDM5IDE2ODg5MzE1MDk3ODY3OTQ=