<?php
namespace gnomephp\mvc\router;

class ToField{
	private $source;
	
	
	const REGEXP_CM = '/([\$A-Za-z0-9_\\\\]+)\.([\$A-Za-z0-9_]+)\((.*?)\)$/';
	
	public function __construct($source){
		$this->source = $source;
	}

	/**
	 * Returns array if success reverseValidated.
	 * Array of additional parameters to deliver to from field.
	 * 
	 * returns false if we didn't find reverse path.
	 * 
	 * @param string $_controller
	 * @param string $_method
	 * @param array $args
	 */
	public function reverseValidate($_controller, $_method, $args){
		$additionalArgs = array();
		
		// Extra regexp that will get appended depended on flags .
		$r = '';
		
		$hasAnonymousArgs = false;
		// Argument check is quite machine costly. 
		if (is_array($args)){
			
			$namedKeys = array_keys($args);
			// remove int keys, they can match anyway! ( Anonymous Arguments )
			foreach($namedKeys as $k => $v){
				if (is_int($v)){
					unset($namedKeys[$k]);
					$hasAnonymousArgs = true;
				}
			}
		
			
			if (count($namedKeys) > 0){
				foreach($namedKeys as $v){
					// Arguments does not match, meaning, lets not compare this one!
					if (!strstr($this->source, '$'.$v)){
						return false;
					}
				}
			}
			
		}
		
		// Allow support for variables in controller / method.
		$c = $_controller;
		$m = $_method;
		
		
		preg_match(ToField::REGEXP_CM, $this->source, $matches);
		list($mock, $controller, $method, $args) = $matches;
		
		$controllerDynamic = substr($controller, 0, 1) == '$' ? true : false;
		$methodDynamic = substr($method, 0, 1) == '$' ? true : false;
		
		// Allow \ns\Controller .
		$c = str_replace('\\','\\\\', $c);
		
		if ($controllerDynamic){
			$c = '([\$A-Za-z0-9_]*)';
			$additionalArgs[substr($controller, 1)] = $_controller;
		}
		if ($methodDynamic){
			$m = '([\$A-Za-z0-9_]*)';
			$additionalArgs[substr($method, 1)] = $_method;
		}
		if (preg_match("/$c\.$m$r/", $this->source))return $additionalArgs;
		
		return false;
	}
	
	public function getComponent($vars){
		preg_match(ToField::REGEXP_CM, $this->source, $matches);
		
		// List them out.
		list($mock, $controller, $method, $args) = $matches;

		// Prepare the arguments
		$ar = array();
		
		// Did we get arguments to parse ?
		if ($args)$ar = str_getcsv($args);
		
			
		// Var support for method and controller.
		$controllerDynamic = substr($controller, 0, 1) == '$' ? true : false;
		$methodDynamic = substr($method, 0, 1) == '$' ? true : false;
		foreach($vars['vars'] as $key => $value){
			
			if ($controllerDynamic){
				if ($key == substr($controller, 1)){
					$controller = $value;
					$controllerDynamic = false; // No longer dynamic
				}
			}
			if ($methodDynamic){
				if ($key == substr($method, 1)){
					$method = $value;
					$methodDynamic = false; // No longer dynamic
				}
			}
		}
		
		
		// Parse arguments to get values.
		foreach($ar as $k => $v){
			if (substr($v, 0, 1) == '$' && isset($vars['vars'][substr($v, 1)])){
				$ar[$k] = $vars['vars'][substr($v, 1)];
			}
		}
		
		// Add anonymous vars in the end if we got it!
		if ($vars['anonymousVars'] !== null){
			$ar = array_merge($ar, $vars['anonymousVars']);
		}
		
		// Return array of controller, method , arguments.
		return new BackendObject($controller, $method, $ar);
	}
}