<?php

namespace CorpusParole\Http\Controllers\Api;

// use Illuminate\Http\Request;

// use CorpusParole\Http\Requests;

use CorpusParole\Http\Controllers\Controller;

use Illuminate\Http\Request;

use EasyRdf\Resource;

use EasyRdf\Literal;

use CorpusParole\Libraries\Sparql\SparqlClient;

use CorpusParole\Services\LexvoResolverInterface;

use CorpusParole\Services\BnfResolverInterface;

class ThemeController extends Controller

{

    private $sparqlClient = null;

    public function __construct(SparqlClient $sparqlClient, LexvoResolverInterface $lexvoResolver, BnfResolverInterface $bnfResolver) {

        $this->sparqlClient = $sparqlClient;

        $this->lexvoResolver = $lexvoResolver;

        $this->bnfResolver = $bnfResolver;

    }

    /**

     * Display the specified resource.

     *

     * @return \Illuminate\Http\Response

     */

    public function index(Request $request)

    {

        $filter = $request->input('filter', 'bnf');

        $resolve = filter_var($request->input('resolve', true), FILTER_VALIDATE_BOOLEAN);

        $filterClause = "";

        if($filter === 'bnf') {

            $filterClause = "FILTER (isIRI(?o) && regex(str(?o), '^".config('corpusparole.bnf_ark_base_url')."')) .";

        }

        elseif($filter === 'uri') {

            $filterClause = "FILTER isIRI(?o) .";

        }

        elseif($filter === 'all' || $filter === 'none' || $filter === '') {

            $filterClause = "";

        }

        else {

            abort(401,"Value for filter parameter must be in 'bnf', 'uri', 'all' or 'none'");

        }

        $query =  preg_replace('/\s+/', ' ',

         "select (?o as ?theme) (COUNT(?s) as ?count) where {

            ?s a <http://www.europeana.eu/schemas/edm/ProvidedCHO> .

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

            $filterClause

          }

          GROUP BY ?o

          ORDER BY DESC(?count)");

        $docs = $this->sparqlClient->query($query);

        $themes = [];

        $labels = [];

        $bnfUris = [];

        $lexvoUris = [];

        foreach ($docs as $row) {

            $key = "";

            $label = null;

            if($row->theme instanceof Resource) {

                $key = $row->theme->getUri();

                if($resolve && strpos($key, config('corpusparole.bnf_ark_base_url')) === 0) {

                    array_push($bnfUris, $key);

                }

                elseif($resolve && strpos($key, config('corpusparole.lexvo_base_url')) === 0) {

                    array_push($lexvoUris, $key);

                }

                $label = null;

            }

            elseif($row->theme instanceof Literal) {

                $key = $row->theme->getValue();

                $label = $row->theme->getValue();

            }

            $themes[$key] = [

                "label" => $label,

                "count" => $row->count->getValue()

            ];

        }

        if($resolve) {

            if(count($lexvoUris) > 0) {

                $labels = $this->lexvoResolver->getNames($lexvoUris);

            }

            if(count($bnfUris) > 0) {

                $labels = array_merge($labels, $this->bnfResolver->getLabels($bnfUris));

            }

            foreach ($themes as $themeKey => $themeDef) {

                if(array_key_exists($themeKey, $labels)) {

                    $themeDef['label'] = $labels[$themeKey];

                }

                $themes[$themeKey] = $themeDef;

            }

        }

        return response()->json(['themes' => $themes ]);

    }

}