<?php

namespace App\Http\Controllers\Customer;

use App\Http\Controllers\Controller;
use App\Models\AppNotification;
use App\Models\AppNotificationRead;
use App\Services\AppNotificationAudienceService;
use App\Services\ConfigService;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Http\Request;
use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;

class AppNotificationController extends Controller
{
    private function assertFeatureEnabled(): void
    {
        if (! app(ConfigService::class)->getBool('has_page_notification', true)) {
            throw new NotFoundHttpException('اعلان داخل اپ غیرفعال است.');
        }
    }

    private function visibleQuery(int $customerId): Builder
    {
        return AppNotification::query()
            ->where('is_active', true)
            ->where(function (Builder $q) use ($customerId) {
                $q->where('audience_type', AppNotificationAudienceService::TYPE_ALL)
                    ->orWhere(function (Builder $inner) use ($customerId) {
                        $inner->whereIn('audience_type', [
                            AppNotificationAudienceService::TYPE_SEGMENT,
                            AppNotificationAudienceService::TYPE_CUSTOMERS,
                        ])->whereHas('recipients', function (Builder $r) use ($customerId) {
                            $r->where('customer_id', $customerId);
                        });
                    });
            });
    }

    public function index()
    {
        $this->assertFeatureEnabled();
        $customerId = (int) auth()->id();

        $rows = $this->visibleQuery($customerId)
            ->orderByDesc('id')
            ->limit(100)
            ->get(['id', 'title', 'body', 'severity', 'created_at']);

        $readIds = AppNotificationRead::query()
            ->where('customer_id', $customerId)
            ->whereIn('notification_id', $rows->pluck('id'))
            ->pluck('notification_id')
            ->all();
        $readSet = array_fill_keys($readIds, true);

        $payload = $rows->map(function (AppNotification $row) use ($readSet) {
            return [
                'id' => $row->id,
                'title' => $row->title,
                'body' => $row->body,
                'severity' => $row->severity,
                'created_at' => $row->created_at,
                'is_read' => isset($readSet[$row->id]),
            ];
        });

        return response()->json($payload);
    }

    public function unreadCount()
    {
        $this->assertFeatureEnabled();
        $customerId = (int) auth()->id();

        $visibleIds = $this->visibleQuery($customerId)->select('id');
        $total = (clone $visibleIds)->count();
        $read = AppNotificationRead::query()
            ->where('customer_id', $customerId)
            ->whereIn('notification_id', $visibleIds)
            ->count();

        return response()->json([
            'unread_count' => max(0, $total - $read),
        ]);
    }

    public function markRead(Request $request, int $id)
    {
        $this->assertFeatureEnabled();
        $customerId = (int) auth()->id();

        $exists = $this->visibleQuery($customerId)->where('id', $id)->exists();
        if (! $exists) {
            throw new NotFoundHttpException('اعلان یافت نشد.');
        }

        AppNotificationRead::query()->updateOrCreate(
            [
                'notification_id' => $id,
                'customer_id' => $customerId,
            ],
            [
                'read_at' => now(),
            ]
        );

        return response()->json(true);
    }

    public function markAllRead()
    {
        $this->assertFeatureEnabled();
        $customerId = (int) auth()->id();

        $ids = $this->visibleQuery($customerId)->pluck('id');
        $now = now();
        foreach ($ids as $notificationId) {
            AppNotificationRead::query()->updateOrCreate(
                [
                    'notification_id' => $notificationId,
                    'customer_id' => $customerId,
                ],
                [
                    'read_at' => $now,
                ]
            );
        }

        return response()->json(true);
    }
}