<?php

namespace ProcessMaker\Rules;

use DOMXPath;

use Illuminate\Contracts\Validation\Rule;

use Illuminate\Support\Facades\Validator;

use ProcessMaker\Nayra\Storage\BpmnElement;

use ProcessMaker\Rules\BPMN\AssignPreviousUser;

class BPMNValidation implements Rule

{

protected $rules = [

AssignPreviousUser::class,

];

/** @var \Illuminate\Support\MessageBag */

protected $errors = [];

/**

* Create a new rule instance.

*

* @return void

*/

public function __construct()

{

//

}

/**

* Determine if the validation rule passes.

*

* @param string $attribute

* @param mixed $document

* @return bool

*/

public function passes($attribute, $document)

{

$nodes = [];

$rules = [];

$xpath = new DOMXPath($document);

$childNodes = $xpath->query('//*[@id]');

foreach ($childNodes as $node) {

if ($node instanceof BpmnElement) {

$nodes[$node->getAttribute('id')] = $node;

$rules = $this->addRulesFor($node, $rules);

}

}

$validator = Validator::make($nodes, $rules);

$passes = $validator->passes();

$this->errors = $validator->errors();

return $passes;

}

/**

* Get the validation error message.

*

* @return string

*/

public function message()

{

return 'BPMN Validation failed';

}

public function errors($attribute, $document)

{

return $this->errors;

}

/**

* Add rule for BPMN element $node

*

* @param BpmnElement $node

* @param array $rules

*

* @return array

*/

private function addRulesFor(BpmnElement $node, array $rules)

{

foreach ($this->rules as $rule) {

if ($rule::applyTo($node)) {

$rules[$node->getAttribute('id')][] = new $rule;

}

}

return $rules;

}

}