<?php

namespace Siteworx\Config\Parser;

use Siteworx\Config\Exception\ParseException;

/**
 * JSON parser
 *
 * @package Config
 * @author  Jesus A. Domingo <jesus.domingo@gmail.com>
 * @author  Hassan Khan <contact@hassankhan.me>
 * @author  Filip Š <projects@filips.si>
 * @link    https://github.com/noodlehaus/config
 * @license MIT
 */
class Json implements ParserInterface
{
    /**
     * {@inheritDoc}
     * Parses an JSON file as an array
     *
     * @throws ParseException If there is an error parsing the JSON file
     */
    public function parseFile(string $filename): array
    {
        try {
            $data = json_decode(file_get_contents($filename), true, 512, JSON_THROW_ON_ERROR);
        } catch (\JsonException $exception) {
            throw new ParseException(['message' => $exception->getMessage()]);
        }

        return (array) $this->parse($data, $filename);
    }

    /**
     * {@inheritDoc}
     * Parses an JSON string as an array
     *
     * @throws ParseException|\JsonException If there is an error parsing the JSON string
     */
    public function parseString(string $config): array
    {
        $data = json_decode($config, true, 512, JSON_THROW_ON_ERROR);

        return (array) $this->parse($data);
    }

    /**
     * Completes parsing of JSON data
     *
     * @param  array | null  $data
     * @param  string | null $filename
     * @return array | null
     *
     * @throws ParseException If there is an error parsing the JSON data
     */
    protected function parse(array $data = null, string $filename = null): ?array
    {
        if (json_last_error() !== JSON_ERROR_NONE) {
            $error_message  = 'Syntax error';
            if (function_exists('json_last_error_msg')) {
                $error_message = json_last_error_msg();
            }

            $error = [
                'message' => $error_message,
                'type'    => json_last_error(),
                'file'    => $filename,
            ];

            throw new ParseException($error);
        }

        return $data;
    }

    /**
     * {@inheritDoc}
     */
    public static function getSupportedExtensions(): array
    {
        return ['json'];
    }
}