<?php

declare(strict_types=1);

/*
 * This file is part of the humbug/php-scoper package.
 *
 * Copyright (c) 2017 Théo FIDRY <theo.fidry@gmail.com>,
 *                    Pádraic Brady <padraic.brady@gmail.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Humbug\PhpScoper\Scoper\Composer;

use Humbug\PhpScoper\Scoper;
use Humbug\PhpScoper\Whitelist;
use LogicException;
use stdClass;
use function gettype;
use function Humbug\PhpScoper\json_decode;
use function Humbug\PhpScoper\json_encode;
use function preg_match;
use function sprintf;
use const JSON_PRETTY_PRINT;

final class JsonFileScoper implements Scoper
{
    private $decoratedScoper;

    public function __construct(Scoper $decoratedScoper)
    {
        $this->decoratedScoper = $decoratedScoper;
    }

    /**
     * Scopes PHP and JSON files related to Composer.
     *
     * {@inheritdoc}
     */
    public function scope(string $filePath, string $contents, string $prefix, array $patchers, Whitelist $whitelist): string
    {
        if (1 !== preg_match('/composer\.json$/', $filePath)) {
            return $this->decoratedScoper->scope($filePath, $contents, $prefix, $patchers, $whitelist);
        }

        $decodedJson = json_decode($contents, false);

        if (false === ($decodedJson instanceof stdClass)) {
            throw new LogicException(
                sprintf(
                    'Expected the decoded JSON to be an stdClass instance, got "%s" instead',
                    gettype($decodedJson)
                )
            );
        }

        $decodedJson = AutoloadPrefixer::prefixPackageAutoloadStatements($decodedJson, $prefix, $whitelist);

        return json_encode(
            $decodedJson,
            JSON_PRETTY_PRINT
        );
    }
}