<?php
/*
本番利用にはクレジット表記が必要なので注意
https://labs.goo.ne.jp/apiusage/
*/

class gooAPI
{
	private $app_id = 'xxxxxxxxxxxxxxxxxxxxxxxxxxxx';
	private $api_base = 'https://labs.goo.ne.jp/api/';

	private function request($path = null, $data = array(), $is_json = false)
	{
		$data['app_id'] = $this->app_id;

		$url = $this->api_base.trim($path, '/');

		$ch = curl_init($url);
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
		curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
		curl_setopt($ch, CURLOPT_TIMEOUT, 20);
		curl_setopt($ch, CURLOPT_POST, true);
		if ($is_json) {
			$data = json_encode($data);
			curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
			curl_setopt($ch, CURLOPT_HTTPHEADER, array(
				'Content-Type: application/json',
				'Content-Length: '.strlen($data)
			));
		} else {
			curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($data));
		}
		
		$response = curl_exec($ch);
		$info = curl_getinfo($ch);
		curl_close($ch);

		if (!empty($info['http_code']) && 200 == $info['http_code']) {
			return json_decode($response, true);
		} else {
			vd($info, $response);
		}
	}

	// 形態素解析API
	public function morph($sentence = null, $info_filter = null, $pos_filter = null)
	{
		if (empty($sentence) || !is_string($sentence)) {
			return false;
		}

		$sentence = str_replace(array("\r", "\n", "\t"), '', $sentence);

		$data = $this->request('morph', array(
			'info_filter' => $info_filter,
			'pos_filter' => $pos_filter,
			'sentence' => $sentence
		));

		if (!empty($data['word_list'])) {
			return $data['word_list'];
		}
	}

	// 形態素解析APIの返り値で、主要な語句のみ抽出
	public function morphSimple($sentence = null)
	{
		$data = $this->morph($sentence, null, '名詞|名詞接尾辞|動詞語幹|動詞活用語尾|動詞接尾辞|動詞活用語尾|連用詞|判定詞|Alphabet');
		if (empty($data)) {
			return null;
		}

		// 名詞系と動詞系は1つにまとめる
		$verb_word = $verb_kana = $words = array();
		$before = null;
		foreach($data as $array) {
			foreach($array as $key => $val) {
				if (false !== mb_strpos($val[1], '動詞', 0, 'utf8')) {
					$verb_word[] = $val[0];
					$verb_kana[] = $val[2];
				} else {
					if (!empty($verb_word)) {
						$word = implode('', $verb_word);
						$words[$word] = array(
							'word' => $word,
							'kana' => implode('', $verb_kana),
							'type' => '動詞'
						);
						$verb_word = $verb_kana = array();
					}

					if (!empty($before) && '名詞接尾辞' === $val[1]) {
						$words[$before]['word'] .= $val[0];
						$words[$before]['kana'] .= $val[2];
					} elseif('判定詞' !== $val[1]) {
						$words[$val[0]] = array(
							'word' => $val[0],
							'kana' => $val[2],
							'type' => $val[1]
						);
						$before = $val[0];
					}
				}
			}
		}

		if (!empty($verb_word)) {
			$word = implode('', $verb_word);
			$words[] = array(
				'word' => $word,
				'kana' => implode('', $verb_kana),
				'type' => '動詞'
			);
		}

		return array_values($words);
	}

	// ひらがな化API
	public function toHiragana($sentence = null)
	{
		if (empty($sentence)) {
			return false;
		}

		$data = $this->request('hiragana', array(
			'output_type' => 'hiragana',
			'sentence' => $sentence
		));

		if (!empty($data['converted'])) {
			return $data['converted'];
		}
	}

	// カタカナ化API
	public function toKatakana($sentence = null)
	{
		if (empty($sentence)) {
			return false;
		}

		$data = $this->request('hiragana', array(
			'output_type' => 'katakana',
			'sentence' => $sentence
		));

		if (!empty($data['converted'])) {
			return $data['converted'];
		}
	}

	// 固有表現抽出API
	public function entity($sentence = null, $class_filter = null)
	{
		if (empty($sentence) || !is_string($sentence)) {
			return false;
		}

		$sentence = str_replace(array("\r", "\n", "\t"), '', $sentence);

		$data = $this->request('entity', array(
			'class_filter' => $class_filter,
			'sentence' => $sentence
		));

		if (!empty($data['ne_list'])) {
			return $data['ne_list'];
		}
	}

	// 語句類似度算出API
	public function similarity($word1 = null, $word2 = null)
	{
		if (empty($word1) || !is_string($word1) || empty($word2) || !is_string($word2)) {
			return false;
		}

		$word1 = str_replace(array("\r", "\n", "\t"), '', $word1);
		$word2 = str_replace(array("\r", "\n", "\t"), '', $word2);

		$data = $this->request('similarity', array(
			'query_pair' => array($word1, $word2)
		), true);

		if (array_key_exists('score', $data)) {
			return (int)($data['score']*100);
		}
	}
}