<?php

declare(strict_types=1);

namespace Lightscale\Router;

use Lightscale\Router\Contracts\Middleware;

class Group
{
    use Concerns\HasAncestors;
    use Concerns\HasMiddleware;

    /** @param Middleware[] $middleware */
    public function __construct(
        private Router $router,
        private ?Group $parent,
        private ?string $prefix = null,
        private ?string $name = null,
        array $middleware = [],
    ) {
        $this->middleware = $middleware;
    }

    public function getRouter(): Router
    {
        return $this->router;
    }

    public function getParent(): ?self
    {
        return $this->parent;
    }

    public function prefix(string $value): static
    {
        $this->prefix = $value;

        return $this;
    }

    public function getPrefix(): ?string
    {
        return $this->prefix;
    }

    /**
     * @param callable(Group): ?string $getter
     *
     * @return string[]
     */
    private function getAncestorString(callable $getter): array
    {
        $ancestors = $this->getAncestorsAndSelf();

        return array_filter(
            array_map(fn ($g) => $getter($g), $ancestors),
            fn (?string $v): bool => null !== $v
        );
    }

    public function getFullPrefix(): string
    {
        $prefixes = $this->getAncestorString(fn ($g) => $g->getPrefix());
        $prefixes = array_map(fn (string $p) => trim($p, '/'), $prefixes);

        return count($prefixes) > 0 ? '/'.implode('/', $prefixes) : '';
    }

    public function name(string $value): static
    {
        $this->name = $value;

        return $this;
    }

    public function getName(): ?string
    {
        return $this->name;
    }

    public function getFullName(): ?string
    {
        $names = $this->getAncestorString(fn ($g) => $g->getName());

        return 0 === count($names) ? null : implode('', $names);
    }

    /** @param callable(GroupDefinition): void $cb */
    public function group(callable $cb): void
    {
        ($cb)(new GroupDefinition(
            $this
        ));
    }
}