islam-404

class Collection
{
    public const ASC = 1;
    public const DESC = 0;

    private $generic;

    private $collection = [];

    public function __construct(string $class)
    {
        $this->generic = $class;
    }

    public function addOne(object $object): self
    {
        if (!($object instanceof $this->generic)) {
            throw new InvalidArgumentException(
                'Object mast be instanceof ' . $this->generic . ' class, ' . get_class($object) . ' given'
            );
        }
        $this->collection[] = $object;

        return $this;
    }

    public function addAll(array $objects): self
    {
        array_map([$this, 'addOne'], $objects);

        return $this;
    }

    public function count(): int
    {
        return count($this->collection);
    }

    public function immutable(): self
    {
        return clone $this;
    }

    public function getGeneric(): string
    {
        return $this->generic;
    }

    private function cmp(string $key, int $order): callable
    {
        return static function (object $a, object $b) use ($key, $order) {
            return $order ? $a->$key <=> $b->$key : $b->$key <=> $a->$key;
        };
    }

    public function where(string $query): self
    {
        $linq = new Linq($this);

        return (new self($this->getGeneric()))->addAll($linq->where($query)->get());
    }

    public function sort(string $key, int $order = Collection::ASC): self
    {
        uasort($this->collection, $this->cmp($key, $order));

        return $this;
    }

    public function delete(int $id): void
    {
        if (array_key_exists($id, $this->collection)) {
            unset($this->collection[$id]);
        } else {
            throw new InvalidArgumentException(
                'Key ' . $id . ' is not isset in collection'
            );
        }
    }

    public function limit(int $limit, int $offset = 0): self
    {
        $this->collection = array_slice($this->collection, $offset, $limit);

        return $this;
    }

    public function get(): array
    {
        return $this->collection;
    }
}

class Linq
{
    private $collection;

    private const CONDITIONS_TYPES = [
        '=',
        '!=',
        '>',
        '<',
        '<=',
        '>=',
    ];

    public function __construct(Collection $collection)
    {
        $this->collection = $collection;
    }

    public function where(string $query): self
    {
        $pattern = '#(?P<field>.*)?(?P<condition>' . implode('|', self::CONDITIONS_TYPES) . ')(?P<value>.*)#is';

        preg_match($pattern, $query, $matches);

        $count = count($matches);

        if (!$count || $count < 4) {
            throw new InvalidArgumentException('Not matches ' . '<pre>' . print_r($matches, true) . '</pre>');
        }
        $args = array_map('trim', $matches);

        $array = [
            '=' => '===',
            '!=' => '!==',
        ];

        return $this->prepare(
            $args['field'],
            (in_array($args['condition'], $array, true) ? $array[$args['condition']] : $args['condition']),
            $args['value']
        );
    }

    private function condition($valFirst, string $condition, $valSecond): bool
    {
        switch ($condition) {
            case '=':
                return $valFirst === $valSecond;
            case '!=':
                return $valFirst !== $valSecond;
            case '>':
                return $valFirst > $valSecond;
            case '<':
                return $valFirst < $valSecond;
            case '>=':
                return $valFirst >= $valSecond;
            case '<=':
                return $valFirst <= $valSecond;
            default:
                throw new InvalidArgumentException('Condition not set');
        }
    }

    private function prepare(string $field, string $condition, $value): self
    {
        $new = new Collection($this->collection->getGeneric());

        foreach ($this->collection->get() as $val) {
            !$this->condition($val->$field, $condition, $value) ?: $new->addOne($val);
        }

        $this->collection = $new;

        return $this;
    }


    public function get(): array
    {
        return $this->collection->get();
    }
}

class Changer
{
    private $types = [];

    private $countTypes;

    private $nextType;

    public const NEXT = 1;
    public const RANDOM = 0;

    public static $count = 0;

    public function __construct(array $array, int $nextType = self::NEXT)
    {
        $this->types = $array;
        $this->countTypes = count($array);
        $this->nextType = $nextType;
    }

    public function getNext(): string
    {
        $type = $this->nextType ? $this->types[self::$count++] : $this->types[array_rand($this->types)];

        if (self::$count === $this->countTypes) {
            self::$count = 0;
        }

        return $type;
    }
}

function getFileList(string $dir): array
{
    $array = [];
    $fileSPLObjects = new RecursiveIteratorIterator(
        new RecursiveDirectoryIterator(realpath($dir)),
        RecursiveIteratorIterator::CHILD_FIRST
    );
    foreach ($fileSPLObjects as $fullFileName => $fileSPLObject) {
        if ($fileSPLObject->isFile()) {
            $array[] = $fullFileName;
        }
    }

    return $array;
}