<?php
namespace EEPROM\Uploads;

use InvalidArgumentException;
use Index\XString;
use Index\Data\DbStatementCache;
use Index\Data\IDbConnection;
use EEPROM\Apps\AppInfo;
use EEPROM\Users\UserInfo;

class UploadsData {
    private DbStatementCache $cache;

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

    public function getUploads(
        ?bool $deleted = null,
        ?bool $expired = null,
        ?bool $dmca = null
    ): array {
        $hasDeleted = $deleted !== null;
        $hasExpired = $expired !== null;
        $hasDMCA = $dmca !== null;

        $args = 0;
        $query = 'SELECT upload_id, user_id, app_id, LOWER(HEX(upload_hash)), INET6_NTOA(upload_ip), UNIX_TIMESTAMP(upload_created), UNIX_TIMESTAMP(upload_accessed), UNIX_TIMESTAMP(upload_expires), UNIX_TIMESTAMP(upload_deleted), UNIX_TIMESTAMP(upload_dmca), upload_bump, upload_name, upload_type, upload_size FROM prm_uploads';
        if($hasDeleted) {
            ++$args;
            $query .= sprintf(' WHERE upload_deleted %s NULL', $deleted ? 'IS NOT' : 'IS');
        }
        if($hasExpired)
            $query .= sprintf(' %s upload_expires %s NOW()', ++$args > 1 ? 'AND' : 'WHERE', $expired ? '<=' : '>');
        if($hasDMCA)
            $query .= sprintf(' %s upload_dmca %s NULL', ++$args > 1 ? 'AND' : 'WHERE', $dmca ? 'IS NOT' : 'IS');

        $stmt = $this->cache->get($query);
        $stmt->execute();

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

        while($result->next())
            $uploads[] = new UploadInfo($result);

        return $uploads;
    }

    public function getUpload(
        ?string $uploadId = null,
        ?string $hashString = null,
        AppInfo|string|null $appInfo = null,
        UserInfo|string|null $userInfo = null,
    ): ?UploadInfo {
        $hasUploadId = $uploadId !== null;
        $hasHashString = $hashString !== null;
        $hasAppInfo = $appInfo !== null;
        $hasUserInfo = $userInfo !== null;

        $args = 0;
        $query = 'SELECT upload_id, user_id, app_id, LOWER(HEX(upload_hash)), INET6_NTOA(upload_ip), UNIX_TIMESTAMP(upload_created), UNIX_TIMESTAMP(upload_accessed), UNIX_TIMESTAMP(upload_expires), UNIX_TIMESTAMP(upload_deleted), UNIX_TIMESTAMP(upload_dmca), upload_bump, upload_name, upload_type, upload_size FROM prm_uploads';
        if($hasUploadId) {
            ++$args;
            $query .= ' WHERE upload_id = ?';
        }
        if($hasHashString)
            $query .= sprintf(' %s upload_hash = UNHEX(?)', ++$args > 1 ? 'AND' : 'WHERE');
        if($hasAppInfo)
            $query .= sprintf(' %s app_id = ?', ++$args > 1 ? 'AND' : 'WHERE');
        if($hasUserInfo)
            $query .= sprintf(' %s user_id = ?', ++$args > 1 ? 'AND' : 'WHERE');

        $args = 0;
        $stmt = $this->cache->get($query);
        if($hasUploadId)
            $stmt->addParameter(++$args, $uploadId);
        if($hasHashString)
            $stmt->addParameter(++$args, $hashString);
        if($hasAppInfo)
            $stmt->addParameter(++$args, $appInfo instanceof AppInfo ? $appInfo->getId() : $appInfo);
        if($hasUserInfo)
            $stmt->addParameter(++$args, $userInfo instanceof UserInfo ? $userInfo->getId() : $userInfo);
        $stmt->execute();

        $result = $stmt->getResult();
        return $result->next() ? new UploadInfo($result) : null;
    }

    public function createUpload(
        AppInfo|string $appInfo,
        UserInfo|string $userInfo,
        string $remoteAddr,
        string $fileName,
        string $fileType,
        int $fileSize,
        string $fileHash,
        int $fileExpiry,
        bool $bumpExpiry
    ): UploadInfo {
        if(strpos($fileType, '/') === false)
            throw new InvalidArgumentException('$fileType must contain a /');
        if($fileSize < 1)
            throw new InvalidArgumentException('$fileSize must be more than 0.');
        if(strlen($fileHash) !== 64)
            throw new InvalidArgumentException('$fileHash must be 64 characters.');
        if($fileExpiry < 0)
            throw new InvalidArgumentException('$fileExpiry must be a positive integer.');

        $uploadId = XString::random(32);

        $stmt = $this->cache->get('INSERT INTO prm_uploads (upload_id, app_id, user_id, upload_name, upload_type, upload_size, upload_hash, upload_ip, upload_expires, upload_bump) VALUES (?, ?, ?, ?, ?, ?, UNHEX(?), INET6_ATON(?), FROM_UNIXTIME(?), ?)');
        $stmt->addParameter(1, $uploadId);
        $stmt->addParameter(2, $appInfo instanceof AppInfo ? $appInfo->getId() : $appInfo);
        $stmt->addParameter(3, $userInfo instanceof UserInfo ? $userInfo->getId() : $userInfo);
        $stmt->addParameter(4, $fileName);
        $stmt->addParameter(5, $fileType);
        $stmt->addParameter(6, $fileSize);
        $stmt->addParameter(7, $fileHash);
        $stmt->addParameter(8, $remoteAddr);
        $stmt->addParameter(9, $fileExpiry > 0 ? (time() + $fileExpiry) : 0);
        $stmt->addParameter(10, $bumpExpiry ? $fileExpiry : 0);
        $stmt->execute();

        return $this->getUpload(uploadId: $uploadId);
    }

    public function bumpUploadAccess(UploadInfo $uploadInfo): void {
        $stmt = $this->cache->get('UPDATE prm_uploads SET upload_accessed = NOW() WHERE upload_id = ?');
        $stmt->addParameter(1, $uploadInfo->getId());
        $stmt->execute();
    }

    public function bumpUploadExpires(UploadInfo|string $uploadInfo): void {
        if(!$uploadInfo->hasExpiryTime())
            return;

        $bumpAmount = $uploadInfo->getBumpAmount();
        if($bumpAmount < 1)
            return;

        $stmt = $this->cache->get('UPDATE prm_uploads SET upload_expires = NOW() + INTERVAL ? SECOND WHERE upload_id = ?');
        $stmt->addParameter(1, $bumpAmount);
        $stmt->addParameter(2, $uploadInfo->getId());
        $stmt->execute();
    }

    public function restoreUpload(UploadInfo|string $uploadInfo): void {
        $stmt = $this->cache->get('UPDATE prm_uploads SET upload_deleted = NULL WHERE upload_id = ?');
        $stmt->addParameter(1, $uploadInfo instanceof UploadInfo ? $uploadInfo->getId() : $uploadInfo);
        $stmt->execute();
    }

    public function deleteUpload(UploadInfo|string $uploadInfo): void {
        $stmt = $this->cache->get('UPDATE prm_uploads SET upload_deleted = COALESCE(upload_deleted, NOW()) WHERE upload_id = ?');
        $stmt->addParameter(1, $uploadInfo instanceof UploadInfo ? $uploadInfo->getId() : $uploadInfo);
        $stmt->execute();
    }

    public function nukeUpload(UploadInfo|string $uploadInfo): void {
        $stmt = $this->cache->get('DELETE FROM prm_uploads WHERE upload_id = ? AND upload_dmca IS NULL');
        $stmt->addParameter(1, $uploadInfo instanceof UploadInfo ? $uploadInfo->getId() : $uploadInfo);
        $stmt->execute();
    }
}