<?php

namespace App\Http\Controllers\Api\V1;

use App\Enums\AiTextDeclaration;
use App\Enums\Portal;
use App\Enums\PressReleaseStatus;
use App\Http\Controllers\Api\Concerns\ResolvesRequestedPortal;
use App\Http\Controllers\Controller;
use App\Http\Requests\Api\V1\StorePressReleaseRequest;
use App\Http\Requests\Api\V1\UpdatePressReleaseRequest;
use App\Http\Resources\PressReleaseResource;
use App\Models\Category;
use App\Models\Company;
use App\Models\PressRelease;
use App\Scopes\PortalScope;
use App\Services\Legal\LegalAcceptanceGate;
use App\Services\PressRelease\AiDeclarationRequiredException;
use App\Services\PressRelease\BlacklistViolationException;
use App\Services\PressRelease\BookingRequiredException;
use App\Services\PressRelease\PressReleaseHtmlSanitizer;
use App\Services\PressRelease\PressReleaseService;
use App\Services\PressRelease\QuotaExceededException;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Http\Resources\Json\AnonymousResourceCollection;
use Illuminate\Http\Response;
use Illuminate\Support\Str;
use Illuminate\Validation\Rule;
use Illuminate\Validation\ValidationException;

class PressReleaseController extends Controller
{
    use ResolvesRequestedPortal;

    public function index(Request $request): AnonymousResourceCollection
    {
        abort_unless($request->user()->tokenCan('press-releases:read'), 403);

        // Listenparameter werden validiert statt durchgereicht (Audit F11):
        // ein negatives per_page hob das SQL-Limit auf, ein Array als status
        // lief in einen TypeError.
        $filters = $request->validate([
            'per_page' => ['sometimes', 'integer', 'min:1', 'max:100'],
            'status' => ['sometimes', 'string', Rule::enum(PressReleaseStatus::class)],
        ]);

        $pressReleases = PressRelease::withoutGlobalScope(PortalScope::class)
            ->where('user_id', $request->user()->id)
            ->with($this->apiResourceRelations())
            ->when($filters['status'] ?? null, fn ($query, string $status) => $query->where('status', $status))
            ->latest()
            ->paginate((int) ($filters['per_page'] ?? 25));

        return PressReleaseResource::collection($pressReleases);
    }

    public function store(StorePressReleaseRequest $request): JsonResponse
    {
        $validated = $this->sanitizeHtmlText($request->validated());
        $company = $this->findOwnedCompany((int) $validated['company_id'], $request);
        abort_unless($company !== null, 403);

        // Ziel-Portal: expliziter Parameter > Request-Domain > Firmen-Portal.
        $portal = $this->resolveRequestedPortal($validated['portal'] ?? null, $company->portal)->value;

        $this->assertCategoryFitsPortal((int) $validated['category_id'], $portal, $request);

        $pressRelease = new PressRelease([
            ...$validated,
            'uuid' => (string) Str::uuid(),
            'user_id' => $request->user()->id,
            'portal' => $portal,
            // Über die API angelegte PMs sind immer Entwürfe. Der Übergang nach
            // `review` erfolgt ausschließlich über die explizite submit-Route,
            // damit Blacklist-/Quota-/Log-Prüfung garantiert durchlaufen werden.
            'status' => PressReleaseStatus::Draft->value,
            // Legacy-/service-Clients kennen die KI-Kennzeichnung (Art. 50
            // KI-VO) nicht — Entscheidung 10.07.: fehlende Angabe gilt als
            // „ohne generative KI erstellt"; das API-Kunden-Mailing (R6.4)
            // weist darauf hin, dass die weitere Nutzung diese Erklärung
            // darstellt. v1-Clients deklarieren explizit beim Submit.
            ...($this->isLegacyServiceRequest($request) ? [
                'ai_text_declaration' => AiTextDeclaration::None->value,
                'ai_declaration_confirmed_at' => now(),
            ] : []),
        ]);
        $pressRelease->slug = $pressRelease->generateUniqueSlug($validated['title'], [
            'portal' => $portal,
            'language' => $validated['language'],
        ]);
        $pressRelease->saveWithUniqueSlugRetry($validated['title'], [
            'portal' => $portal,
            'language' => $validated['language'],
        ]);

        return PressReleaseResource::make(
            $pressRelease->load($this->apiResourceRelations())
        )->response()->setStatusCode(201);
    }

    public function show(Request $request, int $pressRelease): PressReleaseResource
    {
        abort_unless($request->user()->tokenCan('press-releases:read'), 403);
        $pressRelease = $this->findOwnedPressRelease($pressRelease, $request);
        abort_unless($pressRelease !== null, 403);

        return PressReleaseResource::make(
            $pressRelease->load($this->apiResourceRelations())
        );
    }

    public function update(UpdatePressReleaseRequest $request, int $pressRelease): PressReleaseResource|JsonResponse
    {
        $pressRelease = $this->findOwnedPressRelease($pressRelease, $request);
        abort_unless($pressRelease !== null, 403);

        if (! in_array($pressRelease->status->value, ['draft', 'rejected'], true)) {
            return response()->json([
                'message' => 'Only draft or rejected press releases may be edited.',
            ], 409);
        }

        $validated = $this->sanitizeHtmlText($request->validated());
        $company = isset($validated['company_id'])
            ? $this->findOwnedCompany((int) $validated['company_id'], $request)
            : $this->findOwnedCompany((int) $pressRelease->company_id, $request);
        abort_unless($company !== null, 403);

        $language = $validated['language'] ?? $pressRelease->language;
        $title = $validated['title'] ?? $pressRelease->title;
        // Beim Update verschiebt nur ein expliziter portal-Parameter die PM —
        // weder Request-Domain noch Firmen-Portal ändern eine bestehende
        // Zuordnung stillschweigend.
        $portal = (Portal::tryFrom((string) ($validated['portal'] ?? ''))
            ?? $pressRelease->portal
            ?? $company->portal)->value;

        // Der resultierende Zustand muss passen (Audit U10): eine neue
        // Kategorie gegen das Ziel-Portal, bei reinem Portalwechsel die
        // bestehende Kategorie gegen das neue Portal.
        if (isset($validated['category_id'])) {
            $this->assertCategoryFitsPortal((int) $validated['category_id'], $portal, $request);
        } elseif ($portal !== $pressRelease->portal->value) {
            $this->assertCategoryFitsPortal((int) $pressRelease->category_id, $portal, $request);
        }

        $pressRelease->fill([
            ...$validated,
            'portal' => $portal,
        ]);

        if (
            array_key_exists('title', $validated)
            || array_key_exists('language', $validated)
            || array_key_exists('company_id', $validated)
        ) {
            // Selbst-Ausschluss übernimmt der Trait automatisch ($self->exists).
            $pressRelease->slug = $pressRelease->generateUniqueSlug($title, [
                'portal' => $portal,
                'language' => $language,
            ]);
        }

        $pressRelease->saveWithUniqueSlugRetry($title, [
            'portal' => $portal,
            'language' => $language,
        ]);

        // Inhaltliche Änderung einer bereits geprüften/bewerteten PM → neu prüfen.
        if ($pressRelease->wasChanged(['title', 'text'])) {
            $service = app(PressReleaseService::class);
            $service->reclassifyIfClassified($pressRelease);
            $service->rescoreIfScored($pressRelease);
        }

        return PressReleaseResource::make(
            $pressRelease->load($this->apiResourceRelations())
        );
    }

    /**
     * Reicht eine PM zur Prüfung ein – der einzige API-Weg nach `review`.
     *
     * Kapselt denselben Funnel wie das Web-Formular: Blacklist-Hard-Filter,
     * Statuswechsel, Status-Log und Quota werden über den
     * `PressReleaseService` garantiert durchlaufen. `published` bleibt über die
     * API unerreichbar.
     */
    public function submit(Request $request, int $pressRelease, PressReleaseService $service): PressReleaseResource|JsonResponse
    {
        abort_unless($request->user()->tokenCan('press-releases:write'), 403);

        // KI-Kennzeichnungspflicht (Art. 50 KI-VO) auch via API: der
        // Submit-Call trägt den deklarierten KI-Grad des Textes und gilt
        // dokumentiert als verbindliche Bestätigung der Deklaration sowie
        // Kenntnisnahme der dauerhaften Archivierung (AGB § 13) —
        // Entscheidung 10.07.2026.
        $validated = $request->validate([
            'ai_text_declaration' => ['required', Rule::enum(AiTextDeclaration::class)],
        ]);

        $pressRelease = $this->findOwnedPressRelease($pressRelease, $request);
        abort_unless($pressRelease !== null, 403);

        if (! in_array($pressRelease->status->value, ['draft', 'rejected'], true)) {
            return response()->json([
                'message' => 'Only draft or rejected press releases may be submitted for review.',
            ], 409);
        }

        // Zustimmungsgate (Block G, O2): ohne Annahme der aktuellen AGB- und
        // Richtlinien-Fassung 428 mit den geforderten Versionen.
        $gate = app(LegalAcceptanceGate::class);
        $requiredDocuments = $gate->requiredFor($request->user());

        if ($requiredDocuments->isNotEmpty()) {
            return response()->json([
                'message' => 'The current terms and guidelines must be accepted before submitting (POST /api/v1/legal/acceptances).',
                'required_documents' => $requiredDocuments->map(fn ($document) => $gate->describe($document))->values(),
            ], 428);
        }

        $pressRelease->update([
            'ai_text_declaration' => $validated['ai_text_declaration'],
            'ai_declaration_confirmed_at' => now(),
        ]);

        try {
            $service->submitForReview($pressRelease, 'api');
        } catch (BookingRequiredException $exception) {
            return response()->json([
                'message' => $exception->getMessage(),
            ], 402);
        } catch (QuotaExceededException $exception) {
            return response()->json([
                'message' => $exception->getMessage(),
            ], 422);
        } catch (AiDeclarationRequiredException $exception) {
            return response()->json([
                'message' => $exception->getMessage(),
            ], 422);
        } catch (BlacklistViolationException $exception) {
            return response()->json([
                'message' => $exception->getMessage(),
            ], 422);
        }

        return PressReleaseResource::make(
            $pressRelease->fresh()->load($this->apiResourceRelations())
        );
    }

    public function destroy(Request $request, int $pressRelease): JsonResponse|Response
    {
        abort_unless($request->user()->tokenCan('press-releases:write'), 403);
        $pressRelease = $this->findOwnedPressRelease($pressRelease, $request);
        abort_unless($pressRelease !== null, 403);

        if ($pressRelease->status->value === 'published') {
            return response()->json([
                'message' => 'Published press releases cannot be deleted via API.',
            ], 409);
        }

        $pressRelease->delete();

        return response()->noContent();
    }

    /**
     * Die Kategorie muss aktiv sein und zum Ziel-Portal passen (Audit F11):
     * `exists:categories,id` allein ließ inaktive und portalfremde Kategorien
     * durch. Legacy-Aliasse (/service/…) lösen ihre Kategorie über legacy_id
     * im eigenen Controller auf und bleiben hier außen vor.
     */
    private function assertCategoryFitsPortal(int $categoryId, string $portal, Request $request): void
    {
        if ($this->isLegacyServiceRequest($request)) {
            return;
        }

        $fits = Category::query()
            ->whereKey($categoryId)
            ->where('is_active', true)
            ->whereIn('portal', [$portal, Portal::Both->value])
            ->exists();

        if (! $fits) {
            throw ValidationException::withMessages([
                'category_id' => 'Die Kategorie ist inaktiv oder gehört nicht zum Ziel-Portal.',
            ]);
        }
    }

    private function findOwnedCompany(int $companyId, Request $request): ?Company
    {
        return Company::withoutGlobalScope(PortalScope::class)
            ->whereKey($companyId)
            ->accessibleBy($request->user())
            ->first();
    }

    /**
     * Relationen für die API-Resource-Ausgabe. Zentral, damit Index, Show,
     * Create, Update und Reclassify denselben Satz laden.
     *
     * @return list<string>
     */
    private function apiResourceRelations(): array
    {
        return ['company:id,name,portal,legacy_portal,legacy_id', 'category.translations', 'images'];
    }

    private function findOwnedPressRelease(int $pressReleaseId, Request $request): ?PressRelease
    {
        return PressRelease::withoutGlobalScope(PortalScope::class)
            ->whereKey($pressReleaseId)
            ->ownedByApiUser($request->user())
            ->first();
    }

    /**
     * Kam der Call über die Legacy-Aliasse (/service/…, routes/legacy-api.php)?
     * Dort gelten Kompatibilitäts-Defaults für Felder, die die Altportale
     * nicht kannten (KI-Kennzeichnung).
     */
    private function isLegacyServiceRequest(Request $request): bool
    {
        return str_starts_with((string) $request->route()?->getName(), 'legacy-service.');
    }

    /**
     * Säubert einen per API übergebenen HTML-Text vor der Persistenz — analog
     * zum Web-Formular, das immer über den Sanitizer speichert. Nur HTML wird
     * durch HTMLPurifier gejagt; Legacy-Plaintext bleibt unverändert (wird beim
     * Rendern ohnehin escaped), damit `<`/`&` in Klartext-Einreichungen nicht
     * zerstört werden.
     *
     * @param  array<string, mixed>  $validated
     * @return array<string, mixed>
     */
    private function sanitizeHtmlText(array $validated): array
    {
        $sanitizer = app(PressReleaseHtmlSanitizer::class);

        if (array_key_exists('text', $validated) && $sanitizer->isHtml($validated['text'])) {
            $validated['text'] = $sanitizer->clean($validated['text']);
        }

        return $validated;
    }
}