<?php

/**
 * Uguu
 *
 * @copyright Copyright (c) 2022 Go Johansson (nokonoko) <neku@pomf.se>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

namespace Pomf\Uguu\Classes;

use Exception;
use PDO;

class Database
{
    private PDO $DB;

    public function setDB($DB): void
    {
        $this->DB = $DB;
    }


    /**
     * @throws Exception
     */
    public function dbCheckNameExists($name): string
    {
        try {
            $q = $this->DB->prepare('SELECT COUNT(filename) FROM files WHERE filename = (:name)');
            $q->bindValue(':name', $name);
            $q->execute();
            return $q->fetchColumn();
        } catch (Exception) {
            throw new Exception('Cant check if name exists in DB.', 500);
        }
    }

    /**
     * @throws Exception
     */
    public function checkFileBlacklist($FILE_INFO): void
    {
        try {
            $q = $this->DB->prepare('SELECT hash, COUNT(*) AS count FROM blacklist WHERE hash = (:hash)');
            $q->bindValue(':hash', $FILE_INFO['SHA1']);
            $q->execute();
            $result = $q->fetch();
            if ($result['count'] > 0) {
                throw new Exception('File blacklisted!', 415);
            }
        } catch (Exception) {
            throw new Exception('Cant check blacklist DB.', 500);
        }
    }

    /**
     * @throws Exception
     */
    public function antiDupe($hash): bool | array | string
    {
        if (!$this->CONFIG['ANTI_DUPE']) {
            return true;
        }

        try {
            $q = $this->DB->prepare(
                'SELECT filename, COUNT(*) AS count FROM files WHERE hash = (:hash)'
            );
            $q->bindValue(':hash', $hash);
            $q->execute();
            $result = $q->fetch();
            if ($result['count'] > 0) {
                return $result['filename'];
            } else {
                return true;
            }
        } catch (Exception) {
            throw new Exception('Cant check for dupes in DB.', 500);
        }
    }

    /**
     * @throws Exception
     */
    public function newIntoDB($FILE_INFO, $fingerPrintInfo): void
    {
        try {
            $q = $this->DB->prepare(
                'INSERT INTO files (hash, originalname, filename, size, date, ip)' .
                'VALUES (:hash, :orig, :name, :size, :date, :ip)'
            );
            $q->bindValue(':hash', $FILE_INFO['SHA1']);
            $q->bindValue(':orig', $FILE_INFO['NAME']);
            $q->bindValue(':name', $FILE_INFO['NEW_NAME']);
            $q->bindValue(':size', $FILE_INFO['SIZE'], PDO::PARAM_INT);
            $q->bindValue(':date', $fingerPrintInfo['timestamp']);
            $q->bindValue(':ip', $fingerPrintInfo['ip']);
            $q->execute();
        } catch (Exception) {
            throw new Exception('Cant insert into DB.', 500);
        }
    }


    public function createRateLimit($fingerPrintInfo): void
    {
        $q = $this->DB->prepare(
            'INSERT INTO timestamp (iphash, files, time)' .
            'VALUES (:iphash, :files, :time)'
        );

        $q->bindValue(':iphash', $fingerPrintInfo['ip_hash']);
        $q->bindValue(':files', $fingerPrintInfo['files_amount']);
        $q->bindValue(':time', $fingerPrintInfo['timestamp']);
        $q->execute();
    }

    public function updateRateLimit($fCount, $iStamp, $fingerPrintInfo): void
    {
        if ($iStamp) {
            $q = $this->DB->prepare(
                'UPDATE ratelimit SET files = (:files), time = (:time) WHERE iphash = (:iphash)'
            );
            $q->bindValue(':time', $fingerPrintInfo['timestamp']);
        } else {
            $q = $this->DB->prepare(
                'UPDATE ratelimit SET files = (:files) WHERE iphash = (:iphash)'
            );
        }

        $q->bindValue(':files', $fCount);
        $q->bindValue(':iphash', $fingerPrintInfo['ip_hash']);
        $q->execute();
    }


    public function checkRateLimit($fingerPrintInfo): bool
    {
        $q = $this->DB->prepare(
            'SELECT files, time, iphash, COUNT(*) AS count FROM ratelimit WHERE iphash = (:iphash)'
        );
        $q->bindValue(':iphash', $fingerPrintInfo['ip_hash']);
        $q->execute();
        $result = $q->fetch();

        $nTime = $fingerPrintInfo['timestamp'] - (60);

        switch (true) {
            //If more then 100 files trigger rate-limit
            case $result['files'] > 100:
                return true;

                //if timestamp is older than one minute, set new files count and timestamp
            case $result['time'] < $nTime:
                $this->updateRateLimit($fingerPrintInfo['files_amount'], true, $fingerPrintInfo);
                break;

                //if timestamp isn't older than one-minute update the files count
            case $result['time'] > $nTime:
                $this->updateRateLimit($fingerPrintInfo['files_amount'] + $result['files'], false, $fingerPrintInfo);
                break;

                //If there is no other match a record does not exist, create one
            default:
                $this->createRateLimit($fingerPrintInfo);
                break;
        }
        return false;
    }
}