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<?php

declare(strict_types=1);

/*
 * This file is part of PHP CS Fixer.
 *
 * (c) Fabien Potencier <[email protected]>
 *     Dariusz Rumiński <[email protected]>
 *
 * This source file is subject to the MIT license that is bundled
 * with this source code in the file LICENSE.
 */

namespace PhpCsFixer\Cache;

use PhpCsFixer\Utils;

/**
 * @author Andreas Möller <[email protected]>
 *
 * @internal
 */
final class Cache implements CacheInterface
{
    private SignatureInterface $signature;

    /**
     * @var array<string, string>
     */
    private array $hashes = [];

    public function __construct(SignatureInterface $signature)
    {
        $this->signature = $signature;
    }

    public function getSignature(): SignatureInterface
    {
        return $this->signature;
    }

    public function has(string $file): bool
    {
        return \array_key_exists($file, $this->hashes);
    }

    public function get(string $file): ?string
    {
        if (!$this->has($file)) {
            return null;
        }

        return $this->hashes[$file];
    }

    public function set(string $file, string $hash): void
    {
        $this->hashes[$file] = $hash;
    }

    public function clear(string $file): void
    {
        unset($this->hashes[$file]);
    }

    public function toJson(): string
    {
        $json = json_encode([
            'php' => $this->getSignature()->getPhpVersion(),
            'version' => $this->getSignature()->getFixerVersion(),
            'indent' => $this->getSignature()->getIndent(),
            'lineEnding' => $this->getSignature()->getLineEnding(),
            'rules' => $this->getSignature()->getRules(),
            'hashes' => $this->hashes,
        ]);

        if (JSON_ERROR_NONE !== json_last_error() || false === $json) {
            throw new \UnexpectedValueException(sprintf(
                'Cannot encode cache signature to JSON, error: "%s". If you have non-UTF8 chars in your signature, like in license for `header_comment`, consider enabling `ext-mbstring` or install `symfony/polyfill-mbstring`.',
                json_last_error_msg()
            ));
        }

        return $json;
    }

    /**
     * @throws \InvalidArgumentException
     */
    public static function fromJson(string $json): self
    {
        $data = json_decode($json, true);

        if (null === $data && JSON_ERROR_NONE !== json_last_error()) {
            throw new \InvalidArgumentException(sprintf(
                'Value needs to be a valid JSON string, got "%s", error: "%s".',
                $json,
                json_last_error_msg()
            ));
        }

        $requiredKeys = [
            'php',
            'version',
            'indent',
            'lineEnding',
            'rules',
            'hashes',
        ];

        $missingKeys = array_diff_key(array_flip($requiredKeys), $data);

        if (\count($missingKeys) > 0) {
            throw new \InvalidArgumentException(sprintf(
                'JSON data is missing keys %s',
                Utils::naturalLanguageJoin(array_keys($missingKeys))
            ));
        }

        $signature = new Signature(
            $data['php'],
            $data['version'],
            $data['indent'],
            $data['lineEnding'],
            $data['rules']
        );

        $cache = new self($signature);

        // before v3.11.1 the hashes were crc32 encoded and saved as integers
        // @TODO: remove the to string cast/array_map in v4.0
        $cache->hashes = array_map(static fn ($v): string => \is_int($v) ? (string) $v : $v, $data['hashes']);

        return $cache;
    }

    /**
     * @internal
     */
    public function backfillHashes(self $oldCache): bool
    {
        if (!$this->getSignature()->equals($oldCache->getSignature())) {
            return false;
        }

        $this->hashes = array_merge($oldCache->hashes, $this->hashes);

        return true;
    }
}