Map.php

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<?php

declare(strict_types=1);

namespace ILIAS\LegalDocuments;

use Closure;
use Exception;

class Map
{
    public function __construct(
        private readonly array $map = [],
    ) {
    }

    public function add(string $name, $item): static
    {
        return $this->map($name, fn($list) => [...$list, $item]);
    }

    public function set(string $name, string $key, $item): static
    {
        return $this->map($name, fn(array $map) => [...$map, $key => $item]);
    }

    public function has(string $name, string $key): bool
    {
        return isset($this->map[$name][$key]);
    }

    public function append(self $other): self
    {
        array_map(function ($mine, $other) {
            $mine ??= [];
            $other ??= [];
            if (count($mine) + count($other) !== count(array_merge($mine, $other))) {
                throw new Exception('Cannot append maps. Keys must be distinct.');
            }
        }, $this->map, $other->value());
        return new self(array_merge_recursive($this->map, $other->value()));
    }

    public function value(): array
    {
        return $this->map;
    }

    private function map(string $key, Closure $proc): static
    {
        return new self([...$this->map, $key => $proc($this->map[$key] ?? [])]);
    }
}