<?php

namespace CorpusParole\Models;

use Config;

use CorpusParole\Libraries\Utils;

use CorpusParole\Libraries\CocoonUtils;

use CorpusParole\Libraries\RdfModel\RdfModelResource;

use JsonSerializable;

use Log;

use EasyRdf\Literal;

use EasyRdf\Resource;

use EasyRdf\Graph;

use EasyRdf\Isomorphic;

/**

 * Model class for Document. Inherit from EasyRd\Resource

 * SELECT DISTINCT ?g WHERE {GRAPH ?g {?s ?p ?o}}

 */

class Document extends RdfModelResource implements JsonSerializable {

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

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

    }

    private $id = null;

    // memoization

    private $providedCHO = null;

    private $title = false;

    private $publishers = null;

    private $mediaArray = null;

    private $issued = null;

    private $modified = null;

    public function getProvidedCHO() {

        if(is_null($this->providedCHO)) {

            $this->providedCHO = $this->get("<http://www.europeana.eu/schemas/edm/aggregatedCHO>");

        }

        return $this->providedCHO;

    }

    private function clearMemoizationCache() {

        $this->providedCHO = null;

        $this->title = false;

        $this->publishers = null;

        $this->mediaArray = null;

        $this->issued = null;

        $this->modified = null;

    }

    public function getId() {

        if(is_null($this->id)) {

            $this->id = CocoonUtils::getIdFromCorpusUri($this->uri);

        }

        return $this->id;

    }

    public function getTitle() {

        if($this->title === false) {

            try {

                $this->title = $this->getProvidedCHO()->getLiteral('<http://purl.org/dc/elements/1.1/title>');

            } catch(\Exception $e) {

                $this->title = null;

            }

        }

        return $this->title;

    }

    public function getPublishers() {

        if(is_null($this->publishers)) {

            try {

                $this->publishers = $this->getProvidedCHO()->all('dc11:publisher');

            } catch(\Exception $e) {

               $this->publishers = [];

            }

        }

        return $this->publishers;

    }

    public function getIssued() {

        if(is_null($this->issued)) {

            try {

                $this->issued = $this->getProvidedCHO()->getLiteral("<http://purl.org/dc/terms/issued>");

            } catch(\Exception $e) {

                $this->issued = null;

            }

        }

        return $this->issued;

    }

    public function getModified() {

        if(is_null($this->modified)) {

            try {

                $this->modified = $this->getProvidedCHO()->getLiteral("<http://purl.org/dc/terms/modified>");

                if(is_null($this->modified)) {

                    $this->modified = $this->getIssued();

                }

            } catch(\Exception $e) {

                $this->modified = null;

            }

        }

        return $this->modified;

    }

    public function getMediaArray() {

        if(is_null($this->mediaArray)) {

            //TODO: add media type

            $this->mediaArray = [];

            $master = $this->get('<http://www.europeana.eu/schemas/edm/isShownBy>');

            $masterUrl = is_null($master)?null:$master->getUri();

            foreach($this->graph->allOfType("<http://www.europeana.eu/schemas/edm/WebResources>") as $webResource) {

                $extent = is_null($extent)?null:$extent->getValue();

                $extent_ms = Utils::iso8601IntervalToMillis($extent);

                $format = $webResource->getLiteral("dc11:format");

                $this->mediaArray[$webResource->getUri()] = [

                    'url' => $webResource->getUri(),

                    'format' => is_null($format)?null:$format->getValue(),

                    'extent' => $extent,

                    'extent_ms' => $extent_ms,

                    'master' => (($webResource->getUri() === $masterUrl)?true:false)

                ];

            }

        }

        return $this->mediaArray;

    }

    public function getTypes() {

        return $this->getProvidedCHO()->all('dc11:type');

    }

    public function getDiscourseTypes() {

        return array_values(array_filter($this->getTypes(), function($v) {

            return $v instanceof Literal && $v->getDatatypeUri() === Config::get('corpusparole.olac_discourse_type')['uri'];

        }));

    }

    public function getOtherTypes() {

        $res = array_values(array_filter($this->getTypes(), function($v) {

            return $v instanceof Resource || $v->getDatatypeUri() !== Config::get('corpusparole.olac_discourse_type')['uri'];

        }));

        return $res;

    }

    /**

     * change discourse type list

     */

    public function updateDiscourseTypes(array $discoursesTypes) {

        $this->startDelta();

        //delete

        foreach($this->getDiscourseTypes() as $discourseType) {

            $literalValue = new Literal($discourseType, null, Config::get('corpusparole.olac_discourse_type')['uri']);

            $this->getProvidedCHO()->delete('dc11:type', $literalValue);

            $this->currentDelta->getDeletedGraph()->add($this->getProvidedCHO(), 'dc11:type', new Literal($discourseType, null, Config::get('corpusparole.olac_discourse_type')['uri']));

        }

        // and re-add them

        foreach($discoursesTypes as $dType) {

            $this->getProvidedCHO()->add('dc11:type', new Literal($dType, null, Config::get('corpusparole.olac_discourse_type')['uri']));

            $this->currentDelta->getAddedGraph()->add($this->getProvidedCHO(), 'dc11:type', new Literal($dType, null, Config::get('corpusparole.olac_discourse_type')['uri']));

        }

        $this->clearMemoizationCache();

    }

    public function isIsomorphic($doc) {

        return Isomorphic::isomorphic($this->graph, $doc->graph);

    }

    /*

     * Clone document.

     * clone also the innerDocumenent

     */

    public function __clone() {

        $this->graph = new Graph($this->graph->getUri(), $this->graph->toRdfPhp());

    }

    public function jsonSerialize() {

        if(!$this->graph) {

            return [

                'id' => $this->getId(),

            ];

        } else {

            $mediaArray = array_map(

                function($m) {

                    $f = Utils::processLiteralOrString($m['format']);

                $this->getMediaArray()

            );

            $publishers = array_map(

                function($v) { return Utils::processLiteralOrString($v); },

                $this->getPublishers()

            );

            return [

                'id' => $this->getId(),

                'uri' => $this->getUri(),

                'publishers' => $publishers,

                'mediaArray'=> $mediaArray

            ];

        }

    }

}