<?php

namespace App\Service;

use App\Entity\Company;
use App\Entity\Reseller;
use Symfony\Component\Routing\Generator\UrlGeneratorInterface;

/**
 * Baut aus einem aufgelösten Tenant das Branding (Name, Farben, Logo) für die SPA.
 * Fallback-Kette: Firma → Reseller → Plattform-Standard. So erbt eine Firma ohne
 * eigenes Branding automatisch das ihres Resellers.
 */
final class BrandingService
{
    public const SCOPE_RESELLER = 'reseller';
    public const SCOPE_COMPANY = 'company';

    /** Plattform-Standard (vcard4reseller-Orange). */
    private const COLOR_DEFAULTS = [
        'primaryColor' => '#f58220',
        'primaryColorDark' => '#d96500',
        'primaryColorSoft' => '#fff2e7',
        'tagline' => null,
    ];

    public function __construct(private readonly UrlGeneratorInterface $urls)
    {
    }

    /**
     * @return array{level:string,name:string,reseller:?string,customDomain:bool,branding:array<string,mixed>}
     */
    public function forTenant(ResolvedTenant $tenant): array
    {
        $branding = self::COLOR_DEFAULTS;
        foreach ($this->configChain($tenant) as $config) {
            foreach (self::COLOR_DEFAULTS as $key => $_) {
                if (isset($config[$key]) && '' !== $config[$key]) {
                    $branding[$key] = $config[$key];
                }
            }
        }
        $branding['logoUrl'] = $this->logoUrl($tenant);

        return [
            'level' => $tenant->kind,
            'name' => $this->name($tenant),
            'reseller' => $tenant->reseller?->getName(),
            'customDomain' => $tenant->customDomain,
            'branding' => $branding,
        ];
    }

    /** Öffentliche Logo-URL eines Tenants (am spezifischsten zuerst), oder null. */
    public function logoUrl(ResolvedTenant $tenant): ?string
    {
        if (null !== $tenant->company && '' !== (string) ($tenant->company->getBrandingConfig()['logoKey'] ?? '')) {
            return $this->logoRoute(self::SCOPE_COMPANY, (string) $tenant->company->getId(), $tenant->company->getBrandingConfig()['logoKey']);
        }
        if (null !== $tenant->reseller && '' !== (string) ($tenant->reseller->getBrandingConfig()['logoKey'] ?? '')) {
            return $this->logoRoute(self::SCOPE_RESELLER, (string) $tenant->reseller->getId(), $tenant->reseller->getBrandingConfig()['logoKey']);
        }

        return null;
    }

    /** @return array<int, array<string,mixed>> */
    private function configChain(ResolvedTenant $tenant): array
    {
        $chain = [];
        if (null !== $tenant->reseller) {
            $chain[] = $tenant->reseller->getBrandingConfig();
        }
        if (null !== $tenant->company) {
            $chain[] = $tenant->company->getBrandingConfig();
        }

        return $chain;
    }

    private function logoRoute(string $scope, string $id, mixed $logoKey): string
    {
        return $this->urls->generate('branding_logo', ['scope' => $scope, 'id' => $id])
            .'?v='.substr(sha1((string) $logoKey), 0, 8);
    }

    private function name(ResolvedTenant $tenant): string
    {
        if ($tenant->isCompany() && $tenant->company instanceof Company) {
            return $tenant->company->getName();
        }
        if ($tenant->isReseller() && $tenant->reseller instanceof Reseller) {
            return $tenant->reseller->getName();
        }

        return 'vcard4reseller';
    }
}