<?php

namespace CorpusParole\Libraries\RdfModel;

use CorpusParole\Libraries\RdfModel\RdfModelDelta;

use EasyRdf\Resource;

/**

 *

 */

class RdfModelResource extends Resource {

    public function __construct($uri, $graph = null) {

        parent::__construct($uri, $graph);

        $this->uri = $uri;

    }

    protected $deltaList = [];

    protected $currentDelta = null;

    protected $uri = null;

    protected function additionalDeltaLists() {

        return [];

    }

    public function isDirty() {

        return $this->deltaCount()>0;

    }

    public function deltaCount() {

        $deltaList = $this->getDeltaList();

        return is_null($deltaList)?0:count($deltaList);

    }

    public function getDeltaList() {

        $deltaList = is_null($this->deltaList)?[]:$this->deltaList;

        $additionalDeltaLists = $this->additionalDeltaLists();

        if(!empty($additionalDeltaLists)) {

            array_unshift($additionalDeltaLists, $deltaList);

            $deltaList = call_user_func_array('array_merge', $additionalDeltaLists);

        }

        return $deltaList;

    }

    public function getUri() {

        return $this->uri;

    }

    public function getCurrentDelta() {

        return $this->currentDelta;

    }

    public function startDelta() {

        $this->currentDelta = new RdfModelDelta($this->getGraph()->getUri());

        array_push($this->deltaList, $this->currentDelta);

        return $this->currentDelta;

    }

    protected function setSimpleProperty($baseNode, $property, $oldValue, $newValue) {

        $delta = $this->startDelta();

        $baseNode->delete($property, $oldValue);

        $delta->getDeletedGraph()->add($baseNode, $property, $oldValue);

        $baseNode->add($property, $newValue);

        $delta->getAddedGraph()->add($baseNode, $property, $newValue);

    }

}