<?php

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

namespace CloudObjects\PhpMAE;

use Slim\Psr7\Response;
use Slim\ResponseEmitter;
use ML\JsonLD\Node;
use CloudObjects\SDK\ObjectRetriever;

class ErrorHandler {

    private $classMap = [];
    private $responseGenerator;

    public function __construct() {
        // ini_set("display_errors", 0);
        $this->setResponseGenerator(function($error, $object) {
            $message = substr($error['message'], 0,  strpos($error['message'], ' in /'));
            $response = (new Response(500))->withHeader('Content-Type', 'text/plain');
            $response->getBody()->write("Error in implementation of <".$object->getId()."> at revision "
                . $object->getProperty(ObjectRetriever::REVISION_PROPERTY)->getValue()
                . ":\n".$message);
            return $response;
        });
    }

    public function addMapping($filename, Node $object) {
        $this->classMap[realpath($filename)] = $object;
    }

    public function setResponseGenerator(callable $responseGenerator) {
        $this->responseGenerator = $responseGenerator;
    }

    public function getErrorResponse() {
        $error = error_get_last();
        if ($error !== null && in_array($error['type'], [ E_ERROR, E_COMPILE_ERROR ])
                && isset($this->classMap[$error['file']])) {

            $response = call_user_func($this->responseGenerator, $error, $this->classMap[$error['file']]);
            (new ResponseEmitter())->emit($response);
        }
    }

}