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<?php
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namespace Aws\S3;
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use AWS\CRT\CRT;
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use Aws\Exception\CommonRuntimeException;
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use GuzzleHttp\Psr7;
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use InvalidArgumentException;
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trait CalculatesChecksumTrait
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{
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    private static $supportedAlgorithms = [
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        'crc32c' => true,
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        'crc32' => true,
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        'sha256' => true,
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        'sha1' => true
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    ];
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    /**
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     * @param string $requestedAlgorithm  the algorithm to encode with
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     * @param string $value               the value to be encoded
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     * @return string
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     */
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    public static function getEncodedValue($requestedAlgorithm, $value) {
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        $requestedAlgorithm = strtolower($requestedAlgorithm);
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        $useCrt = extension_loaded('awscrt');
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        if (isset(self::$supportedAlgorithms[$requestedAlgorithm])) {
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            if ($useCrt) {
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                $crt = new Crt();
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                switch ($requestedAlgorithm) {
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                    case 'crc32c':
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                        return base64_encode(pack('N*',($crt::crc32c($value))));
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                    case 'crc32':
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                        return base64_encode(pack('N*',($crt::crc32($value))));
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                    default:
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                        break;
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                }
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            }
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            if ($requestedAlgorithm === 'crc32c') {
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                throw new CommonRuntimeException("crc32c is not supported for checksums "
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                    . "without use of the common runtime for php.  Please enable the CRT or choose "
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                    . "a different algorithm."
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                );
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            }
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            if ($requestedAlgorithm === "crc32") {
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                $requestedAlgorithm = "crc32b";
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            }
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            return base64_encode(Psr7\Utils::hash($value, $requestedAlgorithm, true));
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        }
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        $validAlgorithms = implode(', ', array_keys(self::$supportedAlgorithms));
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        throw new InvalidArgumentException(
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            "Invalid checksum requested: {$requestedAlgorithm}."
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            . "  Valid algorithms supported by the runtime are {$validAlgorithms}."
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        );
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    }
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}