<?php

namespace App\Http\Controllers\Web;

use App\Enums\ActivityType;
use App\Enums\BotCheckStatus;
use App\Enums\ContactMessageStatus;
use App\Enums\ContactMessageTopic;
use App\Http\Controllers\Controller;
use App\Models\ContactMessage;
use App\Services\ActivityLog;
use App\Services\Spam\ContactSpamFilter;
use App\Services\Spam\SpamLog;
use App\Services\Spam\TurnstileVerifier;
use App\Services\Web\ContactMessageNotifier;
use App\Support\WebPortalContext;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Facades\RateLimiter;
use Illuminate\Validation\Rule;
use Illuminate\Validation\ValidationException;

/**
 * Öffentliches Kontaktformular der Web-Domains (Hub-Modal + schwebendes
 * Kontakt-Widget). Persistiert das Anliegen in der Admin-Queue „Kontakt"
 * (contact_messages) und versendet zusätzlich eine Mail an die Brand-
 * Kontaktadresse (config domains.*.brand.contact_email, Fallback:
 * Absenderadresse der Anwendung).
 *
 * Spamschutz (dev/sicherheit/ENTWICKLUNGSPLAN-SPAMSCHUTZ-2026-10-09.md):
 * Cloudflare Turnstile für Gäste, danach Inhaltsfilter. Treffer des Filters
 * landen in der Quarantäne (Status Spam, keine Mail); war Cloudflare nicht
 * erreichbar, wird angenommen und im Verlauf markiert.
 */
class ContactController extends Controller
{
    public function __construct(
        private readonly TurnstileVerifier $turnstile,
        private readonly ContactSpamFilter $spamFilter,
        private readonly ContactMessageNotifier $notifier,
        private readonly ActivityLog $activityLog,
    ) {}

    public function __invoke(Request $request): RedirectResponse
    {
        // Bot: ein ausgefülltes Honeypot-Feld → still und neutral abnicken,
        // bewusst VOR der Validierung (sonst verrät die size:0-Regel die Falle).
        if (filled($request->input('website')) || filled($request->input('homepage'))) {
            return $this->done();
        }

        $validated = $request->validate([
            'name' => ['required', 'string', 'max:255'],
            'email' => ['required', 'email', 'max:255'],
            'message' => ['required', 'string', 'min:10', 'max:5000'],
            'topic' => ['nullable', Rule::enum(ContactMessageTopic::class)],
            // Nur http/https: page_url wird im Admin-Backend als klickbarer Link
            // gerendert — verhindert eingeschleuste javascript:-URIs (Stored XSS).
            'page_url' => ['nullable', 'url:http,https', 'max:500'],
        ], [
            'name.required' => __('web.launcher.validation_name'),
            'name.max' => __('web.launcher.validation_name'),
            'email.required' => __('web.launcher.validation_email'),
            'email.email' => __('web.launcher.validation_email'),
            'email.max' => __('web.launcher.validation_email'),
            'message.required' => __('web.launcher.validation_message'),
            'message.min' => __('web.launcher.validation_message_min'),
            'message.max' => __('web.launcher.validation_message_max'),
        ]);

        $this->ensureNotRateLimited($request);
        RateLimiter::hit($this->throttleKey($request), 3600);

        // Bestätigte Kunden sind keine Bots. Unbestätigte Konten (dort
        // landen die Bot-Registrierungen) prüfen wir wie Gäste.
        $trusted = $request->user()?->hasVerifiedEmail() === true;

        $botCheck = $trusted ? null : $this->turnstile->verifyRequest($request, 'contact');

        if ($botCheck?->blocks()) {
            throw ValidationException::withMessages([
                'turnstile' => __('web.launcher.bot_check_failed'),
            ]);
        }

        $spamReason = $trusted ? null : $this->spamFilter->reasonFor(
            $validated['name'],
            $validated['message'],
            $request->string(ContactSpamFilter::STARTED_FIELD)->toString(),
        );

        $topic = ContactMessageTopic::tryFrom($validated['topic'] ?? '') ?? ContactMessageTopic::Contact;

        $message = ContactMessage::create([
            'portal' => $this->portal($request),
            'topic' => $topic,
            'status' => $spamReason !== null ? ContactMessageStatus::Spam : ContactMessageStatus::Open,
            'name' => $validated['name'],
            'email' => $validated['email'],
            'message' => $validated['message'],
            'page_url' => $validated['page_url'] ?? null,
            'payload' => array_filter([
                'spam_reason' => $spamReason,
                'bot_check' => $botCheck?->status === BotCheckStatus::Skipped ? null : $botCheck?->status->value,
                'bot_check_reason' => $botCheck?->needsReview() ? $botCheck->reason : null,
            ]) ?: null,
            'requester_ip' => $request->ip(),
            'user_id' => $request->user()?->id,
        ]);

        // Spam: gespeichert zur Nachprüfung, aber keine Mail. Der Absender
        // bekommt dieselbe Bestätigung wie alle — der Bot lernt nichts.
        if ($spamReason !== null) {
            Log::channel('spam')->info('Kontaktanfrage in Quarantäne.', [
                'reason' => $spamReason,
                'portal' => $message->portal,
                'ip_prefix' => SpamLog::ipPrefix($request->ip()),
            ]);

            return $this->done();
        }

        if ($botCheck?->needsReview()) {
            $this->activityLog->record(
                ActivityType::BotCheckUnavailable,
                sprintf('Kontaktanfrage %s ohne Bot-Prüfung angenommen (%s) — bitte nachprüfen.', $message->reference(), $botCheck->reason),
                subject: $message,
                actorLabel: (string) $message->email,
                meta: ['form' => 'contact', 'reason' => $botCheck->reason],
            );
        }

        $this->notifier->notify($message, $request->getHost());

        return $this->done();
    }

    private function done(): RedirectResponse
    {
        return back()->with('contact-status', __('web.launcher.success'));
    }

    /**
     * Portal-Kennung für die Admin-Queue, aus dem Host abgeleitet:
     * Hub (pressekonto) vs. Spoke-Portale.
     */
    private function portal(Request $request): string
    {
        if (str_contains($request->getHost(), 'pressekonto')) {
            return 'pressekonto';
        }

        return WebPortalContext::portalFromHost()->value;
    }

    private function ensureNotRateLimited(Request $request): void
    {
        if (! RateLimiter::tooManyAttempts($this->throttleKey($request), 5)) {
            return;
        }

        $seconds = RateLimiter::availableIn($this->throttleKey($request));

        throw ValidationException::withMessages([
            'message' => __('web.launcher.throttle', [
                'minutes' => max(1, (int) ceil($seconds / 60)),
            ]),
        ]);
    }

    private function throttleKey(Request $request): string
    {
        return 'contact-form|'.$request->ip();
    }
}