<?php

declare(strict_types=1);

namespace App\Http\Controllers;

use App\Exceptions\WeeztixCouponCodeConflictException;
use App\Http\Requests\SubscribePublicPageRequest;
use App\Jobs\SyncSubscriberToMailwizz;
use App\Models\PageBlock;
use App\Models\PreregistrationPage;
use App\Models\Subscriber;
use App\Models\WeeztixConfig;
use App\Services\WeeztixService;
use Illuminate\Http\JsonResponse;
use Illuminate\Support\Collection;
use Illuminate\Support\Facades\Log;
use Illuminate\View\View;
use Throwable;

class PublicPageController extends Controller
{
    public function show(PreregistrationPage $publicPage): View
    {
        $publicPage->load(['blocks' => fn ($q) => $q->orderBy('sort_order')]);

        $pageState = $this->resolvePageState($publicPage);
        $blocksToRender = $this->filterBlocksForPageState($publicPage, $pageState);
        $subscriberCount = $publicPage->subscribers()->count();

        $title = $publicPage->headlineForMeta();

        return view('public.page', [
            'page' => $publicPage,
            'pageState' => $pageState,
            'blocksToRender' => $blocksToRender,
            'subscriberCount' => $subscriberCount,
            'title' => $title,
        ]);
    }

    public function subscribe(SubscribePublicPageRequest $request, PreregistrationPage $publicPage): JsonResponse
    {
        abort_if(now()->lt($publicPage->start_date) || now()->gt($publicPage->end_date), 403);

        $validated = $request->validated();

        $exists = $publicPage->subscribers()
            ->where('email', $validated['email'])
            ->exists();

        if ($exists) {
            return response()->json([
                'success' => false,
                'message' => __('You are already registered for this event.'),
            ], 422);
        }

        $subscriber = $publicPage->subscribers()->create($validated);

        $publicPage->loadMissing('weeztixConfig');
        $weeztix = $publicPage->weeztixConfig;
        if ($this->weeztixCanIssueCodes($weeztix)) {
            $this->tryAttachWeeztixCouponCode($subscriber, $weeztix);
        }

        if ($publicPage->mailwizzConfig !== null) {
            SyncSubscriberToMailwizz::dispatch($subscriber->fresh());
        }

        return response()->json([
            'success' => true,
            'message' => $publicPage->thank_you_message ?? __('Thank you for registering!'),
        ]);
    }

    private function weeztixCanIssueCodes(?WeeztixConfig $config): bool
    {
        if ($config === null || ! $config->is_connected) {
            return false;
        }

        $company = $config->company_guid;
        $coupon = $config->coupon_guid;

        return is_string($company) && $company !== '' && is_string($coupon) && $coupon !== '';
    }

    private function tryAttachWeeztixCouponCode(Subscriber $subscriber, WeeztixConfig $config): void
    {
        $freshConfig = $config->fresh();
        if ($freshConfig === null) {
            return;
        }

        $service = new WeeztixService($freshConfig);
        $maxAttempts = 5;

        for ($attempt = 0; $attempt < $maxAttempts; $attempt++) {
            try {
                $code = WeeztixService::generateUniqueCode(
                    is_string($freshConfig->code_prefix) && $freshConfig->code_prefix !== ''
                        ? $freshConfig->code_prefix
                        : 'PREREG'
                );
                $service->createCouponCode($code);
                $subscriber->update(['coupon_code' => $code]);

                return;
            } catch (WeeztixCouponCodeConflictException) {
                continue;
            } catch (Throwable $e) {
                Log::error('Weeztix coupon creation failed', [
                    'subscriber_id' => $subscriber->id,
                    'message' => $e->getMessage(),
                ]);

                return;
            }
        }

        Log::warning('Weeztix coupon: exhausted duplicate retries', [
            'subscriber_id' => $subscriber->id,
        ]);
    }

    private function resolvePageState(PreregistrationPage $page): string
    {
        if ($page->isBeforeStart()) {
            return 'countdown';
        }

        if ($page->isExpired()) {
            return 'expired';
        }

        return 'active';
    }

    /**
     * @return Collection<int, PageBlock>
     */
    private function filterBlocksForPageState(PreregistrationPage $page, string $pageState): Collection
    {
        return $page->visibleBlocks()
            ->orderBy('sort_order')
            ->get()
            ->filter(function (PageBlock $block) use ($pageState): bool {
                return match ($pageState) {
                    'countdown' => in_array($block->type, ['hero', 'countdown', 'image'], true),
                    'expired' => in_array($block->type, ['hero', 'image', 'cta_banner'], true),
                    default => true,
                };
            })
            ->values();
    }
}