<?php

declare(strict_types=1);

namespace Set022;

use ReflectionClass;

final class DirectionaryLocator
{
    /**
     * @param string $dir
     *
     * @return Dictionary[]
     */
    public static function locateDictionaries(string $dir): array
    {
        $dictionaryFiles = array_values(
            array_filter(
                array_map(
                    function (string $filePath) use ($dir) {
                        return realpath($dir.DIRECTORY_SEPARATOR.$filePath);
                    },
                    array_filter(
                        scandir($dir),
                        function (string $file): bool {
                            return 1 === preg_match('/.*Dictionary\.php$/', $file);
                        }
                    )
                ),
                function ($filePath): bool {
                    return false !== $filePath;

                }
            )
        );

        $classes = get_declared_classes();

        foreach ($dictionaryFiles as $dictionaryFile) {
            include $dictionaryFile;
        }

        $newClasses = array_diff(get_declared_classes(), $classes);

        return array_reduce(
            $newClasses,
            function (array $dictionaries, string $className): array {
                $class = new ReflectionClass($className);

                if (false === $class->isAbstract() && $class->implementsInterface(Dictionary::class)) {
                    $dictionaries[] = $class->newInstanceWithoutConstructor();
                }

                return $dictionaries;
            },
            []
        );
    }

    private function __construct()
    {

    }
}