<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use App\Models\User;
use App\Models\UserNotification;
use App\Services\FcmService;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;

class NotificationController extends Controller
{
    public function index()
    {
        $recent = UserNotification::with('user')
            ->orderByDesc('created_at')
            ->limit(50)
            ->get();

        $stats = [
            'total'   => UserNotification::count(),
            'unread'  => UserNotification::whereNull('read_at')->count(),
            'users'   => User::count(),
            'today'   => UserNotification::whereDate('created_at', today())->count(),
        ];

        return view('admin.notifications.index', compact('recent', 'stats'));
    }

    public function send(Request $request)
    {
        $data = $request->validate([
            'title'     => 'required|string|max:100',
            'body'      => 'required|string|max:500',
            'url'       => 'nullable|url|max:300',
            'target'    => 'required|in:all,premium,free',
            'icon'      => 'nullable|string|max:50',
        ]);

        $query = User::query();

        if ($data['target'] === 'premium') {
            $query->where('membership', 'premium')
                  ->where(fn($q) => $q->whereNull('premium_expires_at')->orWhere('premium_expires_at', '>', now()));
        } elseif ($data['target'] === 'free') {
            $query->where(fn($q) => $q->where('membership', '!=', 'premium')->orWhere('premium_expires_at', '<=', now()));
        }

        $users = $query->select('id', 'fcm_token')->get();

        if ($users->isEmpty()) {
            return back()->with('error', 'Hedef kullanıcı bulunamadı.');
        }

        $notifData = json_encode([
            'title'   => $data['title'],
            'body'    => $data['body'],
            'url'     => $data['url'] ?? null,
            'icon'    => $data['icon'] ?? 'bi-megaphone-fill',
            'admin'   => true,
        ]);

        $now  = now();
        $rows = $users->map(fn($u) => [
            'user_id'    => $u->id,
            'type'       => 'admin',
            'data'       => $notifData,
            'created_at' => $now,
        ])->toArray();

        // In-app notifications
        foreach (array_chunk($rows, 500) as $chunk) {
            UserNotification::insert($chunk);
        }

        // FCM Push notifications
        $fcmTokens = $users->pluck('fcm_token')->filter()->values()->toArray();
        if (!empty($fcmTokens)) {
            $fcm = new FcmService();
            $fcm->sendToTokens($fcmTokens, $data['title'], $data['body'], [
                'type' => 'admin',
                'url'  => $data['url'] ?? '',
            ]);
        }

        return back()->with('success', count($rows) . ' kullanıcıya bildirim gönderildi' . (!empty($fcmTokens) ? ' (' . count($fcmTokens) . ' push)' : '') . '.');
    }
}