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<?php

/**
 * This file is part of the Nette Framework (https://nette.org)
 * Copyright (c) 2004 David Grudl (https://davidgrudl.com)
 */

declare(strict_types=1);

namespace Nette\Utils;

use Nette;


/**
 * JSON encoder and decoder.
 */
final class Json
{
	use Nette\StaticClass;

	public const FORCE_ARRAY = JSON_OBJECT_AS_ARRAY;
	public const PRETTY = JSON_PRETTY_PRINT;
	public const ESCAPE_UNICODE = 1 << 19;


	/**
	 * Converts value to JSON format. The flag can be Json::PRETTY, which formats JSON for easier reading and clarity,
	 * and Json::ESCAPE_UNICODE for ASCII output.
	 * @param  mixed  $value
	 * @throws JsonException
	 */
	public static function encode($value, int $flags = 0): string
	{
		$flags = ($flags & self::ESCAPE_UNICODE ? 0 : JSON_UNESCAPED_UNICODE)
			| JSON_UNESCAPED_SLASHES
			| ($flags & ~self::ESCAPE_UNICODE)
			| (defined('JSON_PRESERVE_ZERO_FRACTION') ? JSON_PRESERVE_ZERO_FRACTION : 0); // since PHP 5.6.6 & PECL JSON-C 1.3.7

		$json = json_encode($value, $flags);
		if ($error = json_last_error()) {
			throw new JsonException(json_last_error_msg(), $error);
		}

		return $json;
	}


	/**
	 * Parses JSON to PHP value. The flag can be Json::FORCE_ARRAY, which forces an array instead of an object as the return value.
	 * @return mixed
	 * @throws JsonException
	 */
	public static function decode(string $json, int $flags = 0)
	{
		$value = json_decode($json, null, 512, $flags | JSON_BIGINT_AS_STRING);
		if ($error = json_last_error()) {
			throw new JsonException(json_last_error_msg(), $error);
		}

		return $value;
	}
}