<?php

namespace PSX\Schema\Generator;

use PSX\Schema\Generator\Type\GeneratorInterface;
use PSX\Schema\Type\StructType;

/**
 * Protobuf
 *
 * @author  Christoph Kappestein <christoph.kappestein@gmail.com>
 * @license http://www.apache.org/licenses/LICENSE-2.0
 * @link    http://phpsx.org
 */
class Protobuf extends CodeGeneratorAbstract
{
    /**
     * @inheritDoc
     */
    public function getFileName(string $file): string
    {
        return $file . '.proto';
    }

    /**
     * @inheritDoc
     */
    protected function newTypeGenerator(array $mapping): GeneratorInterface
    {
        return new Type\Protobuf($mapping);
    }

    /**
     * @inheritDoc
     */
    protected function writeStruct(
        string $name,
        array $properties,
        ?string $extends,
        ?array $generics,
        StructType $origin,
    ): string {
        $code = 'message ' . $name . ' {' . "\n";

        $index = 1;
        foreach ($properties as $name => $property) {
            /** @var Code\Property $property */
            $code.= $this->indent . $property->getType() . ' ' . $name . ' = ' . $index . ';' . "\n";

            $index++;
        }

        $code.= '}' . "\n";

        return $code;
    }
}
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