<?php

namespace ctiso;

class Url {
    /** @var array<string, string> */
    public array $parts = [];
    public ?Url $parent;

    /**
     * @param Url|null $parent
     */
    function setParent($parent): void {
        $this->parent = $parent;
    }

    /**
     * @param string[] $parts
     */
    function setQuery(array $parts): void {
        $this->parts = $parts;
    }

    function addQueryParam(string $key, ?string $value): void {
        $this->parts[$key] = $value;
    }

    function toString(): string {
        return '?' . http_build_query(array_merge($this->parts, $this->parent ? $this->parent->parts : []));
    }
}