<?php
namespace Uiharu\Lookup;

use RuntimeException;
use Uiharu\Config;
use Uiharu\Url;
use Index\MediaType;

final class TwitterLookup implements \Uiharu\ILookup {
    private const TWITTER_DOMAINS = [
        'twitter.com', 'www.twitter.com',
        'm.twitter.com', 'mobile.twitter.com',
        'nitter.net', 'www.nitter.net',
    ];

    public function match(Url $url): bool {
        if(!$url->isWeb() || !in_array($url->getHost(), self::TWITTER_DOMAINS))
            return false;

        return preg_match('#^/@?(?:[A-Za-z0-9_]{1,20})/status(?:es)?/([0-9]+)/?$#', $url->getPath())
            || preg_match('#^/@?([A-Za-z0-9_]{1,20})/?$#', $url->getPath());
    }

    private function lookupUser(string $userName): ?object {
        $curl = curl_init("https://api.twitter.com/2/users/by?usernames={$userName}&user.fields=description,entities,id,name,profile_image_url,protected,url,username,verified");
        curl_setopt_array($curl, [
            CURLOPT_AUTOREFERER => false,
            CURLOPT_CERTINFO => false,
            CURLOPT_FAILONERROR => false,
            CURLOPT_FOLLOWLOCATION => false,
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_TCP_FASTOPEN => true,
            CURLOPT_CONNECTTIMEOUT => 2,
            CURLOPT_PROTOCOLS => CURLPROTO_HTTPS,
            CURLOPT_TIMEOUT => 5,
            CURLOPT_USERAGENT => 'Uiharu/' . UIH_VERSION,
            CURLOPT_HTTPHEADER => [
                'Authorization: Bearer ' . Config::get('Twitter', 'apiToken'),
                'Accept: application/json',
            ],
        ]);
        $resp = curl_exec($curl);
        curl_close($curl);
        return json_decode($resp);
    }

    private function lookupTweet(string $tweetId): ?object {
        $curl = curl_init("https://api.twitter.com/2/tweets?ids={$tweetId}&expansions=attachments.media_keys,author_id,entities.mentions.username,referenced_tweets.id,referenced_tweets.id.author_id&media.fields=height,width,media_key,preview_image_url,url,type&tweet.fields=attachments,conversation_id,text,source,possibly_sensitive,created_at&user.fields=id,name,profile_image_url,protected,username,verified");
        curl_setopt_array($curl, [
            CURLOPT_AUTOREFERER => false,
            CURLOPT_CERTINFO => false,
            CURLOPT_FAILONERROR => false,
            CURLOPT_FOLLOWLOCATION => false,
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_TCP_FASTOPEN => true,
            CURLOPT_CONNECTTIMEOUT => 2,
            CURLOPT_PROTOCOLS => CURLPROTO_HTTPS,
            CURLOPT_TIMEOUT => 5,
            CURLOPT_USERAGENT => 'Uiharu/' . UIH_VERSION,
            CURLOPT_HTTPHEADER => [
                'Authorization: Bearer ' . Config::get('Twitter', 'apiToken'),
                'Accept: application/json',
            ],
        ]);
        $resp = curl_exec($curl);
        curl_close($curl);
        return json_decode($resp);
    }

    public function lookup(Url $url): TwitterLookupResult {
        if(preg_match('#^/@?(?:[A-Za-z0-9_]{1,20})/status(?:es)?/([0-9]+)/?$#', $url->getPath(), $matches)) {
            $tweetId = strval($matches[1] ?? '0');
            $tweetInfo = $this->lookupTweet($tweetId);
            if($tweetInfo === null)
                throw new RuntimeException('Tweet lookup failed.');
            return new TwitterLookupTweetResult($url, $tweetInfo);
        }

        if(preg_match('#^/@?([A-Za-z0-9_]{1,20})/?$#', $url->getPath(), $matches)) {
            $userName = strval($matches[1] ?? '');
            $userInfo = $this->lookupUser($userName);
            if($userInfo === null)
                throw new RuntimeException('Twitter user lookup failed.');
            return new TwitterLookupUserResult($url, $userInfo);
        }

        throw new RuntimeException('Unknown Twitter URL format.');
    }
}