<?php

namespace App\Paper;

use DiDom\Document;
use DiDom\Query;


class Vocabulary
{

    const URL = 'https://www.vocabulary.com/';
    const EXAMPLES_URL = 'https://corpus.vocabulary.com/api/1.0/';


    public function getWordData($word)
    {
        return new Document($this->getWordUrl($word), true);
    }

    private function getWordUrl($word)
    {
        $word = trim($word);
        return self::URL . 'dictionary/definition.ajax?search=' . $word . '&lang=en';
    }

    private function getWordExamplesUrl($word, $maxResult = 10, $offset = 0)
    {
        $word = trim($word);
        return sprintf('%sexamples.json?query=%s&maxResults=%d&startOffset=%d', self::EXAMPLES_URL, $word, $maxResult, $offset);
    }

    public function getWord($word)
    {
        $document = $this->getWordData($word);


        $wordData = new \stdClass();
        $wordPageSelector = $document->first('.wordPage');
        $wordData->lang = $wordPageSelector->attr('data-lang');
        $wordData->word = $wordPageSelector->attr('data-word');
        $wordData->next = $wordPageSelector->attr('data-next');
        $wordData->prev = $wordPageSelector->attr('data-prev');
        $wordData->short = trim($document->first('p.short')->text());
        $wordData->long = trim($document->first('p.long')->text());

        $wordData->instances = [];
        foreach ($document->find('.ordinal ') as $ordinal) {
            $definition = [];
            $definition['type'] = $ordinal->first('h3')->first('a')->attr('title');
            $definition['definition'] = trim($ordinal->first('//h3[@class="definition"][1]/text()[2]', Query::TYPE_XPATH));
            $definition['example'] = ($example = $ordinal->first('//div[@class="example"]', Query::TYPE_XPATH)) ? $example->text() : '';

            foreach ($ordinal->find('.instances') as $instance) {
                $in = [];
                $in['type'] = str_replace(' ', '_', trim(strtolower($instance->first('dt::text()')), ': '));
                $in['words'] = $instance->find('dd a::text()');
                $in['definition'] = $instance->first('div.definition::text()');
                $definition[$in['type']] = $in;
            }

            $wordData->instances[] = $definition;
        }
        $wordData->examples = $this->getExamples($word, 3);


        return $wordData;
    }

    private function getRandomWordUrl()
    {
        return self::URL . 'randomword.json';
    }

    public function getRandomWord()
    {
        $data = json_decode(file_get_contents($this->getRandomWordUrl()));
        if ($data->status != 0) {
            throw new Exception('error');
        }
        return $data->result->word;
    }

    public function getExamples($word, $maxResult = 10, $offset = 0)
    {
        return json_decode(file_get_contents($this->getWordExamplesUrl($word, $maxResult, $offset)), 1);
    }
}