<?php

namespace CorpusParole\Http\Controllers\Api;

use CorpusParole\Http\Controllers\Controller;

use Illuminate\Http\Request;

use EasyRdf\Resource;

use EasyRdf\Literal;

use Es;

use Log;

use CorpusParole\Services\LexvoResolverInterface;

use CorpusParole\Services\BnfResolverInterface;

use CorpusParole\Libraries\Filters\CorpusFilterManager;

class ThemeController extends Controller

{

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

        $this->lexvoResolver = $lexvoResolver;

        $this->bnfResolver = $bnfResolver;

    }

    /**

     * Display the specified resource.

     *

     * @return \Illuminate\Http\Response

     */

    public function index(Request $request)

    {

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

        $index = $request->input('index', 0);

        $limit = $request->input('limit', config('corpusparole.theme_default_limit'));

        $sort = $request->input('sort', 'count');

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

            $include = ".*\\|bnf\\|.*";

        }

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

            $include = ".*\\|lxv\\|.*";

        }

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

            $include = ".*\\|olac\\|.*";

        }

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

            $include = ".*\\|txt\\|.*";

        }

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

            $include = false;

        }

        else {

            abort(401,"Value for filter parameter must be in 'bnf', 'lexvo', 'olac', 'txt', 'all'");

        }

        if($sort == "count" || $sort == "descending") {

            $order_field = "_count";

            $order_dir = "desc";

        } elseif($sort == "-count") {

            $order_field = "_count";

            $order_dir = "asc";

        } elseif ($sort == "label" || $sort == "alphabetical") {

            $order_field = "_term";

            $order_dir = "asc";

        } elseif ($sort == "-label") {

            $order_field = "_term";

            $order_dir = "desc";

        } else {

            $order_field = "_count";

            $order_dir = "desc";

        }

        $filterManager = new CorpusFilterManager();

        $filters = $filterManager->prepareFilters($request);

        unset($filters['themes']);

        $qFilterParts = $filterManager->buildESFilters($filters);

        $query = $filterManager->buildQuery($qFilterParts);

        $termSize = $limit * ($index+1);

        $esQuery = [

            'index' => config('elasticsearch.index'),

            'body' => [

                'size' => 0,

                'query' => $query,

                'aggs' => [

                    "subjects" => [

                        "nested" => [ "path" => "subject" ],

                        "aggs" => [

                            "subjects" => [

                                "terms" => [

                                    "field" => "subject.label_code",

                                    "size" => ($termSize==0)?2147483647:$termSize,

                                    "order" => [ $order_field => $order_dir ]

                                ]

                            ]

                        ]

                    ]

                ]

            ]

        ];

        if($include) {

            $esQuery['body']['aggs']['subjects']['aggs']['subjects']['terms']['include'] = $include;

        }

        $esRes = Es::search($esQuery);

        $themes = [];

        $bucketList = $esRes['aggregations']['subjects']['subjects']['buckets'];

        if($limit > 0) {

            $bucketList = array_slice($bucketList, $index*$limit, $limit);

        }

        foreach($bucketList as $bucket) {

            $parts = explode("|", $bucket['key']);

            $label = $parts[0];

            if($parts[1] === 'bnf' || $parts[1] === 'lxv') {

                $url = ['bnf' => config('corpusparole.bnf_ark_base_url'), 'lxv' => config('corpusparole.lexvo_base_url')][$parts[1]].$parts[2];

            }

            else {

                $url = $parts[2];

            }

            $themes[$url] = [

                "label" => $label,

                "count" => $bucket['doc_count']

            ];

        }

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

    }

}