<?php

namespace Modules\Core\Privacy\Services;

use LogicException;
use Illuminate\Contracts\Container\Container;
use Modules\Core\Privacy\Contracts\PersonalDataProvider;

/**
 * The registry every PersonalDataProvider is collected through. A module registers
 * by adding its provider's class name to config('core.privacy.providers') — the
 * same shape as Lunar's own config('lunar.search.indexers') model->indexer map, just
 * a plain list since a provider isn't keyed to one model. Core never references a
 * specific provider class; a future ERP/banking/etc. module just adds its own
 * provider class to that config array and PrivacyService picks it up automatically.
 */
class PrivacyManager
{
    public function __construct(private readonly Container $container) {}

    /**
     * @return array<int, PersonalDataProvider>
     */
    public function providers(): array
    {
        $providers = array_map(
            fn (string $class) => $this->container->make($class),
            config('core.privacy.providers', [])
        );

        $this->assertUniqueNames($providers);

        return $providers;
    }

    /**
     * @param  array<int, PersonalDataProvider>  $providers
     */
    private function assertUniqueNames(array $providers): void
    {
        $names = array_map(fn (PersonalDataProvider $provider) => $provider->name(), $providers);
        $duplicates = array_diff_assoc($names, array_unique($names));

        if ($duplicates !== []) {
            throw new LogicException(
                'Duplicate Modules\Core\Privacy provider name(s): '.implode(', ', array_unique($duplicates))
                .'. Each provider registered in config(\'core.privacy.providers\') must return a unique name().'
            );
        }
    }
}