<?php

namespace PSX\Json\Rpc;

use PSX\Json\Rpc\Exception\InvalidRequestException;

/**
 * Simple JSON RPC server which accepts the decoded JSON payload and invokes the
 * provided callable
 *
 * @author  Christoph Kappestein <christoph.kappestein@gmail.com>
 * @license http://www.apache.org/licenses/LICENSE-2.0
 * @link    http://phpsx.org
 */
class Server
{
    /** @var callable */
    private $callable;

    /** @var bool */
    private $debug;

    /** @var Builder */
    private $builder;

    public function __construct($callable, bool $debug = false)
    {
        $this->callable = $callable;
        $this->debug = $debug;
        $this->builder = new Builder();
    }

    public function invoke($data)
    {
        if (is_array($data)) {
            if (count($data) === 0) {
                return $this->builder->createError(new InvalidRequestException('Invalid Request'), null);
            }

            $result = [];
            foreach ($data as $row) {
                $result[] = $this->execute($row);
            }

            return $result;
        } else {
            return $this->execute($data);
        }
    }

    private function execute($data)
    {
        $method = $data->method ?? null;
        $params = $data->params ?? null;
        $id = $data->id ?? null;

        if (empty($method)) {
            return $this->builder->createError(new InvalidRequestException('Invalid Request'), $id);
        }

        try {
            return $this->builder->createResponse(call_user_func_array($this->callable, [$method, $params]), $id);
        } catch (\Throwable $e) {
            return $this->builder->createError($e, $id, $this->debug);
        }
    }
}
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