<?php

namespace CorpusParole\Console\Commands;

use Config;

use Log;

use Illuminate\Console\Command;

use Symfony\Component\Console\Input\InputOption;

use Symfony\Component\Console\Input\InputArgument;

use Phpoaipmh\Client;

use Phpoaipmh\Endpoint;

class ImportCocoonRDF extends Command {

    const INSERT_TIMEOUT_RETRY = 5;

    const MAPPER_CLASS_MAP = [

        "http://purl.org/dc/dcmitype/Sound" => '\CorpusParole\Libraries\Mappers\CocoonSoundRdfMapper',

        "http://purl.org/dc/dcmitype/MovingImage" => '\CorpusParole\Libraries\Mappers\CocoonSoundRdfMapper',

        "http://purl.org/dc/dcmitype/Text" => '\CorpusParole\Libraries\Mappers\CocoonTextRdfMapper',

        "http://purl.org/dc/dcmitype/Collection" => '\CorpusParole\Libraries\Mappers\CocoonCollectionRdfMapper'

    ];

    /**

     * The console command description.

     *

     * @var string

     */

    protected $description = 'Import Rdf from Cocoon.';

    /**

    * The name and signature of the console command.

    *

    * @var string

    */

    protected $signature = "corpus-parole:importRDF

        {--skip=0 : Number of record to skip}

        {--no-raw : Do not record raw queries}

        {--no-raw-clear : Do not clear raw repository}

        {--clear : Clear repository}

        {--force-import : Overwrite document from import event if the repo version is more recent}

        {--keep-repo-doc : Keep the existing doc in repo (default is replace document)}

    ";

    //protected $signature = 'corpus-parole:importRDF {--skip=0 : Number of record to skip}';

    /**

     * Create a new command instance.

     */

    public function __construct() {

        parent::__construct();

    }

    /**

     * Get the list of dcmi types for the graph

     */

    private function getDocTypes($doc, $docUri) {

        $res = $doc->resource($docUri);

        $docTypes = [];

        //foreach ($res->all("http://purl.org/dc/elements/1.1/type") as $resType) {

        foreach ($res->all("dc11:type","resource") as $resType) {

            $type = $resType->getUri();

            if(0 === strpos($type, 'http://purl.org/dc/dcmitype/')) {

                $docTypes[] = $type;

            }

        }

        // if the doc type list is empty, check that we have a collection

        if(empty($docTypes)) {

            if(!empty($doc->allOfType('edm:Collection'))) {

                $docTypes[] = "http://purl.org/dc/dcmitype/Collection";

            }

        }

        return $docTypes;

    }

    /**

     * Map a documents into graphes.

     */

    public function mapDoc($doc, $docUri) {

        $inputDocTypes = $this->getDocTypes($doc, $docUri);

        $docType = count($inputDocTypes)>0? $inputDocTypes[0]:null;

        if(is_null($docType) || !array_key_exists($docType,ImportCocoonRDF::MAPPER_CLASS_MAP)) {

            $this->error("\nError processing $identifier ($docRdfUrl) : $docType unknown mapper");

            Log::error("Error processing $identifier ($docRdfUrl) : $docType unknown mapper");

            $this->documentCount['unknown'] += 1;

            return ['unknown', null];

        }

        $mapperClass = ImportCocoonRDF::MAPPER_CLASS_MAP[$docType];

        $mapper = new $mapperClass($doc, $docUri);

        try {

            $mapper->mapGraph();

        } catch (\Exception $e) {

            Log::error("Error processing $identifier ($docRdfUrl) : error mapping graph : $e");

            $this->documentCount['error'] += 1;

            return ['error', null];

        }

        $this->documentCount['all'] += 1;

        $this->documentCount[$docType] = isset($this->documentCount[$docType])?$this->documentCount[$docType]+1:1;

        return [$docType, $mapper->getOutputGraphes()];

    }

    public function mergeDocs($docType, $outputGraphes) {

        foreach ($outputGraphes as $mappedGraphKey => $mappedGraph) {

            $mappedGraphUri = $mappedGraph->getUri();

            try {

                $resDocs = $this->gs->query("CONSTRUCT { ?s ?p ?o } WHERE { GRAPH <$mappedGraphUri> { ?s ?p ?o }}");

            } catch (\Exception $e) {

                $this->error("\nError on graph query $mappedGraphUri : $e \n" . $e->getMessage() . "\n");

                Log::error("\nError on graph query $mappedGraphUri : $e \n" . $e->getMessage());

                exit;

            }

            $mergedGraph = null;

            $doDelete = true;

            if($resDocs->isEmpty()) {

                $mergedGraph = $mappedGraph;

                $doDelete = false;

            } else {

                $doDelete = true;

                $mappedTypes = $this->getDocTypes($mappedGraph, $mappedGraphUri);

                $presentTypes = $this->getDocTypes($resDocs, $mappedGraphUri);

                if($docType == "http://purl.org/dc/dcmitype/Collection" || in_array("http://purl.org/dc/dcmitype/Collection", $mappedTypes)) {

                    $merger = new \CorpusParole\Libraries\Mergers\CocoonCollectionRdfMerger();

                    $baseGraph = $resDocs;

                    $sourceGraph = $mappedGraph;

                }

                elseif ($docType == "http://purl.org/dc/dcmitype/Text") {

                    $merger = new \CorpusParole\Libraries\Mergers\CocoonTextRdfMerger();

                    $baseGraph = $resDocs;

                    $sourceGraph = $mappedGraph;

                }

                else {

                    $merger = new \CorpusParole\Libraries\Mergers\CocoonSoundRdfMerger();

                    $baseGraph = $mappedGraph;

                    $sourceGraph = $resDocs;

                }

                $mergedGraph = $merger->mergeGraph($baseGraph, $sourceGraph, $mappedGraphUri);

                if(\EasyRdf\Isomorphic::isomorphic($resDocs, $mergedGraph)) {

                    //graph are isomorphic no need to go farther for this graph

                    Log::info("Graph are isomorphic for $mappedGraphUri, skipping");

                    continue;

                }

            }

            try {

                if($doDelete) {

                    $this->gs->clear($mappedGraphUri);

                }

                $this->gs->insert($mergedGraph, $mappedGraphUri);

            }

            catch(\Exception $e) {

                // just log not much we can do here...

                $this->error("\nError on insert $mappedGraphUri : $e");

                Log::error("Error on insert $mappedGraphUri : $e");

                $code = $e->getCode();

                $message = $e->getMessage();

                if($e instanceof EasyRdf\Exception && stripos($message, 'timed out')>=0 && $insertTimeout<= ImportCocoonRDF::INSERT_TIMEOUT_RETRY) {

                    $this->info("\nThis is a timeout, we continue.");

                    Log::info("This is a timeout, we continue.");

                    $insertTimeouts++;

                    continue;

                }

                throw $e;

            }

        }

    }

    function getModified($graph) {

        // get first element of array

        $providedCHORes = $graph->allOfType('http://www.europeana.eu/schemas/edm/ProvidedCHO');

        $providedCHO = reset($providedCHORes);

        if($providedCHO === false) {

            $date = new \DateTime();

            $date->setTimestamp(0);

            return $date;

        }

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

        if(is_null($modified)) {

            $date = new \DateTime();

            $date->setTimestamp(0);

            return $date;

        }

        return \DateTime::createFromFormat(\DateTime::W3C, $modified->getValue());

    }

    /**

     * Execute the console command.

     *

     * @return mixed

     */

    public function handle() {

        libxml_use_internal_errors(true);

        $skip = (int)$this->option('skip');

        $raw = !$this->option('no-raw');

        $rawClear = !$this->option('no-raw-clear');

        $clear = $this->option('clear');

        $forceImport = $this->option('force-import');

        $keepRepoDoc = $this->option('keep-repo-doc');

        $this->comment("Skipping $skip records");

        $this->comment("Querying Cocoon: ".($raw?'TRUE':'FALSE'));

        $this->comment("Clear raw repository: ".($rawClear?'TRUE':'FALSE'));

        $this->comment("Clear repository: ".($clear?'TRUE':'FALSE'));

        $this->comment("Keep existing document into repository: ".($keepRepoDoc?'TRUE':'FALSE'));

        $this->comment("Overwrite more recent document:".($forceImport?'TRUE':'FALSE'));

        $this->documentCount = [

            'all' => 0,

            'unknown' => 0,

            'error' => 0,

            'raw_duplicates' => 0,

            'modified' => 0,

            'replaced' => 0

        ];

        if($raw) {

            $client = new Client(Config::get('corpusparole.cocoon_oaipmh_url'));

            $endpoint = new Endpoint($client);

            $recs = $endpoint->listRecords('olac', null, null, 'LanguesDeFrance');

            $progressBar = $this->output->createProgressBar($recs->getTotalRecordsInCollection());

            $progressBar->setFormat(' %current%/%max% [%bar%] %percent:3s%% - %message%');

            $insertTimeouts = 0;

            //Clear raw repository if asked

            if($rawClear) {

                $this->gs_raw->clear("all");

            }

            foreach ($recs as $item) {

                $item->registerXPathNamespace('oai', "http://www.openarchives.org/OAI/2.0/");

                $identifier = (string) $item->xpath('oai:header/oai:identifier')[0];

                $docRdfUrl = Config::get('corpusparole.cocoon_rdf_base_uri').substr($identifier, strlen(Config::get('corpusparole.cocoon_doc_id_base')));

                $message = "$identifier : $docRdfUrl";

                if($recs->getNumRetrieved() <= $skip) {

                    $progressBar->setMessage("$message - Skipping");

                    $progressBar->advance();

                    continue;

                }

                $progressBar->setMessage($message);

                $progressBar->advance();

                $docUri = config('corpusparole.cocoon_doc_id_base_uri').substr($identifier, strlen(Config::get('corpusparole.cocoon_doc_id_base')));

                $docLoaded = false;

                $loadRetry = 0;

                $doc = null;

                while(!$docLoaded && $loadRetry < config('corpusparole.max_load_retry', 3)) {

                    $loadRetry++;

                    try {

                        $docLoaded = true;

                    }

                    //TODO: catch network exception - add error to database

                            $this->info("\nTimeout error processing $identifier ($docRdfUrl) : $e, retrying");

                            Log::warning("Timeout error processing $identifier ($docRdfUrl) : $e, retrying");

                            continue;

                        }

                        else {

                            $this->error("\nError processing $identifier ($docRdfUrl) : $e");

                            Log::error("Error processing $identifier ($docRdfUrl) : $e");

                            break;

                        }

                    }

                }

                if(!$docLoaded) {

                    $this->documentCount['error'] += 1;

                    continue;

                }

                $resDocsRaw = $this->gs_raw->query("ASK WHERE { GRAPH <$docUri> { ?s ?p ?o }}");

                if($resDocsRaw->getBoolean()) {

                    $this->gs_raw->clear($docUri);

                    $this->documentCount['raw_duplicates'] += 1;

                }

                $this->gs_raw->insert($doc, $docUri);

            }

            $progressBar->setMessage("finished raw import");

            $progressBar->finish();

        }

        if($clear) {

            $this->gs->clear("all");

        }

        $collectionDocsUris = $this->gs_raw->query("SELECT distinct ?uri WHERE {

            GRAPH ?uri {

                ?s <http://purl.org/dc/elements/1.1/type> <http://purl.org/dc/dcmitype/Collection>.

            }

        }");

        $collectionCount = count($collectionDocsUris);

        $this->info("\nImporting $collectionCount Collections from raw repository");

        $progressBar = $this->output->createProgressBar($collectionCount);

        $progressBar->setFormat(' %current%/%max% [%bar%] %percent:3s%% - %message%');

        foreach($collectionDocsUris as $docUriRes) {

            $docUri = $docUriRes->uri->getUri();

            $progressBar->setMessage("Importing collection $docUri.");

            $progressBar->advance();

            $doc = $this->gs_raw->query("CONSTRUCT { ?s ?p ?o } WHERE { GRAPH <$docUri> { ?s ?p ?o. }}");

            //map the doc

            list($docType, $mappedGraphes) = $this->mapDoc($doc, $docUri);

            if($docType === 'unknown' || $docType === 'error') {

                // The error has been traced in mapDoc

                continue;

            }

            //merge the result docs

            $this->mergeDocs($docType, $mappedGraphes);

        }

        $progressBar->setMessage("finished raw import for collections.");

        $progressBar->finish();

        // list the existing documents

        $providedCHODocsUris = [];

        $providedCHODocsUrisRes = $this->gs->query("SELECT distinct ?uri WHERE {

            GRAPH ?uri {

                ?s <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.europeana.eu/schemas/edm/ProvidedCHO>.

            }

        }");

        foreach($providedCHODocsUrisRes as $docUriRes) {

            array_push($providedCHODocsUris, $docUriRes->uri->getUri());

        }

        $this->info("\n\nWe have ".count($providedCHODocsUris)." providedCHO in database.\n");

        $soundDocsUris = $this->gs_raw->query("SELECT distinct ?uri WHERE {

            GRAPH ?uri {

                ?s <http://purl.org/dc/elements/1.1/type> ?o.

                FILTER(?o IN (<http://purl.org/dc/dcmitype/Sound>, <http://purl.org/dc/dcmitype/MovingImage>))

            }