<?php
namespace Seria\Torrents;

use InvalidArgumentException;
use RuntimeException;
use Index\Data\DbStatementCache;
use Index\Data\IDbConnection;
use Seria\Users\UserInfo;

class TorrentPeers {
    private IDbConnection $dbConn;
    private DbStatementCache $cache;

    public function __construct(IDbConnection $dbConn) {
        $this->dbConn = $dbConn;
        $this->cache = new DbStatementCache($dbConn);
    }

    public function pruneExpiredPeers(): void {
        $this->dbConn->execute('DELETE FROM ser_torrents_peers WHERE peer_expires < NOW()');
    }

    public function getPeers(TorrentInfo|string $torrentInfo): array {
        $stmt = $this->cache->get('SELECT peer_id, torrent_id, user_id, INET6_NTOA(peer_address), peer_port, UNIX_TIMESTAMP(peer_updated), UNIX_TIMESTAMP(peer_expires), peer_agent, peer_key, peer_uploaded, peer_downloaded, peer_left FROM ser_torrents_peers WHERE torrent_id = ?');
        $stmt->addParameter(1, $torrentInfo instanceof TorrentInfo ? $torrentInfo->getId() : $torrentInfo);
        $stmt->execute();

        $peers = [];
        $result = $stmt->getResult();

        while($result->next())
            $peers[] = new TorrentPeerInfo($result);

        return $peers;
    }

    public function getPeer(TorrentInfo|string $torrentInfo, string $peerId): ?TorrentPeerInfo {
        $stmt = $this->cache->get('SELECT peer_id, torrent_id, user_id, INET6_NTOA(peer_address), peer_port, UNIX_TIMESTAMP(peer_updated), UNIX_TIMESTAMP(peer_expires), peer_agent, peer_key, peer_uploaded, peer_downloaded, peer_left FROM ser_torrents_peers WHERE torrent_id = ? AND peer_id = ?');
        $stmt->addParameter(1, $torrentInfo instanceof TorrentInfo ? $torrentInfo->getId() : $torrentInfo);
        $stmt->addParameter(2, $peerId);
        $stmt->execute();

        $result = $stmt->getResult();
        if(!$result->next())
            return null;

        return new TorrentPeerInfo($result);
    }

    public function createPeer(
        TorrentInfo|string $torrentInfo,
        UserInfo|string|null $userInfo,
        string $peerId,
        string $remoteAddr,
        int $remotePort,
        int $interval,
        string $peerAgent,
        string $peerKey,
        int $bytesUploaded,
        int $bytesDownloaded,
        int $bytesRemaining
    ): TorrentPeerInfo {
        $stmt = $this->cache->get('INSERT INTO ser_torrents_peers (torrent_id, user_id, peer_id, peer_address, peer_port, peer_updated, peer_expires, peer_agent, peer_key, peer_uploaded, peer_downloaded, peer_left) VALUES (?, ?, ?, INET6_ATON(?), ?, NOW(), NOW() + INTERVAL ? SECOND, ?, ?, ?, ?, ?)');
        $stmt->addParameter(1, $torrentInfo instanceof TorrentInfo ? $torrentInfo->getId() : $torrentInfo);
        $stmt->addParameter(2, $userInfo === null ? null : ($userInfo instanceof UserInfo ? $userInfo->getId() : $userInfo));
        $stmt->addParameter(3, $peerId);
        $stmt->addParameter(4, $remoteAddr);
        $stmt->addParameter(5, $remotePort);
        $stmt->addParameter(6, $interval);
        $stmt->addParameter(7, $peerAgent);
        $stmt->addParameter(8, $peerKey);
        $stmt->addParameter(9, $bytesUploaded);
        $stmt->addParameter(10, $bytesDownloaded);
        $stmt->addParameter(11, $bytesRemaining);
        $stmt->execute();

        return $this->getPeer($torrentInfo, $peerId) ?? throw new RuntimeException('Failed to record peer information.');
    }

    public function updatePeer(
        TorrentInfo|string $torrentInfo,
        TorrentPeerInfo|string $peerInfo,
        string $remoteAddr,
        int $remotePort,
        int $interval,
        string $peerAgent,
        int $bytesUploaded,
        int $bytesDownloaded,
        int $bytesRemaining
    ): void {
        $stmt = $this->cache->get('UPDATE ser_torrents_peers SET peer_address = INET6_ATON(?), peer_port = ?, peer_updated = NOW(), peer_expires = NOW() + INTERVAL ? SECOND, peer_agent = ?, peer_uploaded = ?, peer_downloaded = ?, peer_left = ? WHERE torrent_id = ? AND peer_id = ?');
        $stmt->addParameter(1, $remoteAddr);
        $stmt->addParameter(2, $remotePort);
        $stmt->addParameter(3, $interval);
        $stmt->addParameter(4, $peerAgent);
        $stmt->addParameter(5, $bytesUploaded);
        $stmt->addParameter(6, $bytesDownloaded);
        $stmt->addParameter(7, $bytesRemaining);
        $stmt->addParameter(8, $torrentInfo instanceof TorrentInfo ? $torrentInfo->getId() : $torrentInfo);
        $stmt->addParameter(9, $peerInfo instanceof TorrentPeerInfo ? $peerInfo->getId() : $peerInfo);
        $stmt->execute();
    }

    public function deletePeer(TorrentInfo|string $torrentInfo, TorrentPeerInfo|string $peerInfo): void {
        $stmt = $this->cache->get('DELETE FROM ser_torrents_peers WHERE torrent_id = ? AND peer_id = ?');
        $stmt->addParameter(1, $torrentInfo instanceof TorrentInfo ? $torrentInfo->getId() : $torrentInfo);
        $stmt->addParameter(2, $peerInfo instanceof TorrentPeerInfo ? $peerInfo->getId() : $peerInfo);
        $stmt->execute();
    }

    public function countIncompletePeers(TorrentInfo|string $torrentInfo): int {
        $stmt = $this->cache->get('SELECT COUNT(*) FROM ser_torrents_peers WHERE torrent_id = ? AND peer_left > 0');
        $stmt->addParameter(1, $torrentInfo instanceof TorrentInfo ? $torrentInfo->getId() : $torrentInfo);
        $stmt->execute();
        $result = $stmt->getResult();
        return $result->next() ? $result->getInteger(0) : 0;
    }

    public function countCompletePeers(TorrentInfo|string $torrentInfo): int {
        $stmt = $this->cache->get('SELECT COUNT(*) FROM ser_torrents_peers WHERE torrent_id = ? AND peer_left <= 0');
        $stmt->addParameter(1, $torrentInfo instanceof TorrentInfo ? $torrentInfo->getId() : $torrentInfo);
        $stmt->execute();
        $result = $stmt->getResult();
        return $result->next() ? $result->getInteger(0) : 0;
    }

    public function countUserDownloading(UserInfo|string $userInfo): int {
        $stmt = $this->cache->get('SELECT COUNT(*) FROM ser_torrents_peers WHERE user_id = ? AND peer_left > 0');
        $stmt->addParameter(1, $userInfo instanceof UserInfo ? $userInfo->getId() : $userInfo);
        $stmt->execute();
        $result = $stmt->getResult();
        return $result->next() ? $result->getInteger(0) : 0;
    }

    public function countUserUploading(UserInfo|string $userInfo): int {
        $stmt = $this->cache->get('SELECT COUNT(*) FROM ser_torrents_peers WHERE user_id = ? AND peer_left <= 0');
        $stmt->addParameter(1, $userInfo instanceof UserInfo ? $userInfo->getId() : $userInfo);
        $stmt->execute();
        $result = $stmt->getResult();
        return $result->next() ? $result->getInteger(0) : 0;
    }
}