<?php

namespace App\Service;

use Aws\S3\S3Client;

class AwsService
{

    public function __construct(
        private S3Client $s3Client,
        private string $awsPublicUrl
    ) {

    }

    /**
     * Function to generate UUID Version 4
     *
     * @return string
     */
    public function generateUUIDv4():string {
        $uuid = uuid_create(4);

        $isValid = uuid_is_valid($uuid);

        if( $isValid == true){
            $retour = $uuid;
        }else{
            $retour = 'une erreur est survenue !';
        }

        return $retour;
    }

    /**
     * Get public url for files download or visualisation
     *
     * @param string $bucket nom du conteneur S3
     * @return string
     */
    public function getPublicUrl(string $bucket): string{
        $publicUrl = substr_replace($this->awsPublicUrl, $bucket.'.', 8, 0);
        $publicUrl .= '/';

        return $publicUrl;
    }

    /**
     * CREATE bucket S3 for new project
     *
     * @return string|array
     */
    public function createBucket(): string|array{

        $bucket = $this->generateUUIDv4();

        $result = $this->s3Client->createBucket([
            'Bucket' => $bucket,
            'ObjectOwnership' => 'BucketOwnerPreferred'
        ]);

        if ( $result['@metadata']['statusCode'] == 200){
            return $bucket;
        }else{
            return $result['@metadata'];
        }

    }

    /**
     * DELETE bucket S3
     *
     * @param string $bucket nom du conteneur S3
     * @return string|array
     */
    public function DeleteBucket(string $bucket): string|array{

        $result = $this->s3Client->deleteBucket([
            'Bucket' => $bucket,

        ]);

        if ( $result['@metadata']['statusCode'] == 200){
            return $bucket;
        }else{
            return $result['@metadata'];
        }

    }

    /**
     * Get list files infos in the Bucket S3
     * If prefix NULL get ALL FILES else get FILES in this prefix
     *
     * @param string $bucket nom du conteneur S3
     * @param string|null $prefix arborescence dans le bucket
     * @return array|null
     */
    public function getListObject(string $bucket, string|null $prefix = null):array|null{

        $results = $this->s3Client->listObjectsV2([
            'Bucket' => $bucket,
            'Prefix' => $prefix
        ]);

        if( isset($results['Contents']) ){
            $return = $results['Contents'];
        }

        return $return;
    }

    /**
     * PUT file Object in bucket S3
     *
     * @param string $bucket nom du conteneur S3
     * @param object $file fichier à déposer dans le bucket
     * @param string $filename nom du fichier enregistré dans la bdd métier
     * @param string $mimeType type du fichier
     * @param string|null $prefix arborescence dans le bucket
     * @return bool
     */
    public function PutDocObj(string $bucket, object $file, string $filename, $mimeType, string|null $prefix = null): int{

        $body = fopen( $file, 'r');
        $hashRaw = hash_file('sha256', $file, true);
        $hash = base64_encode($hashRaw);

        rewind($body);

        $doc = $this->s3Client->putObject([
            'Bucket'            => $bucket,
            'ChecksumAlgorithm' => 'SHA256',
            'ChecksumSHA256'    => $hash,
            'Key'               => $prefix.$filename,
            'Body'              => $body,
            'ACL'               => 'public-read',
            'ContentType'       => $mimeType // pour rendre l'image publique si besoin
        ]);

        return $doc['@metadata']['statusCode'];
    }

    /**
     * DELETE file Object in bucket S3
     *
     * @param string $bucket nom du conteneur S3
     * @param string $filename nom du fichier
     * @param string|null $prefix arborescence dans le bucket
     * @return bool
     */
    public function DeleteDocObj(string $bucket, string $filename, string|null $prefix = null): int{

        $doc = $this->s3Client->deleteObject([
            'Bucket'            => $bucket,
            'Key'               => $prefix.$filename,
        ]);

        return $doc['@metadata']['statusCode'];
    }

    /**
     * RENAME file Object in bucket S3
     *
     * @param string $bucket nom du conteneur S3
     * @param string $filename nom du fichier
     * @param string $newFilename
     * @param string|null $prefix arborescence dans le bucket
     * @return bool
     */
    public function renameDocObj(string $bucket, string $filename, string $newFilename, string|null $prefix = null): int{

        $doc = $this->s3Client->copyObject([
            'Bucket'     => $bucket,
            'CopySource' => $prefix.$filename,
            'Key'        => $prefix.$newFilename,
        ]);

        $this->DeleteDocObj($bucket, $filename, $prefix);

        return $doc['@metadata']['statusCode'];
    }

    /**
     * MOVE file Object in bucket S3
     *
     * @param string $bucket nom du conteneur S3
     * @param string $filename nom du fichier
     * @param string|null $prefix arborescence dans le bucket
     * @param string|null $newPrefix nouvel emplacement dans le bucket
     * @return bool
     */
    public function moveDocObj(string $bucket, string $filename, string|null $prefix = null, string|null $newPrefix = null): int{

        $doc = $this->s3Client->copyObject([
            'Bucket'     => $bucket,
            'CopySource' => $prefix.$filename,
            'Key'        => $newPrefix.$filename,
        ]);

        $this->DeleteDocObj($bucket, $filename, $prefix);

        return $doc['@metadata']['statusCode'];
    }
}