<?php

namespace App\Helpers;

use App\Models\Subject;
use App\Models\User;
use Google\Client as GoogleClient;
use Illuminate\Support\Facades\Storage;

class Backend
{
    public static function get_subject_name($class_id, $subject_id)
    {
        if (!empty($subject_id)) {
            $subject = Subject::where(['id' => $subject_id, 'class_id' => $class_id])->first();
            return $subject->subject;
        }
        return "-";
    }

    public static function get_teacher_name($user_id)
    {
        if (!empty($user_id)) {
            $Qteacher = User::join('user_details', 'users.id', '=', 'user_details.user_id');
            $Qteacher->where(['users.id' => $user_id]);
            $teachers = $Qteacher->first(['users.id', 'users.name']);
            if (!empty($teachers)) {
                return $teachers->name;
            }
            return "-";
        }
        return "-";
    }

    // FCM Notification
    public static function sendFcmNotificationTopic($topic_name, $heading, $text, $image = null)
    {
        $title = $heading;
        $description = $text;
        $projectId = config('services.fcm.parent_project_id');
        $credentialsFilePath = Storage::path('json/firebase-adminsdk-4lr71.json');
        $client = new GoogleClient();
        $client->setAuthConfig($credentialsFilePath);
        $client->addScope('https://www.googleapis.com/auth/firebase.messaging');
        $client->refreshTokenWithAssertion();
        $token = $client->getAccessToken();

        $access_token = $token['access_token'];

        $headers = [
            "Authorization: Bearer $access_token",
            'Content-Type: application/json',
        ];

        $data = [
            "message" => [
                'topic' => $topic_name,
                'notification' => [
                    'title' => $title,
                    'body' => $description,
                    'image' => $image ?? "https://school.edukrypt.app/public/logo.png"
                ],
            ],
        ];

        $payload = json_encode($data);

        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, "https://fcm.googleapis.com/v1/projects/$projectId/messages:send");
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $payload);
        curl_setopt($ch, CURLOPT_VERBOSE, true); // Enable verbose output for debugging
        $response = curl_exec($ch);
        $err = curl_error($ch);
        curl_close($ch);
        if ($err) {
            return true;
        } else {
            return false;
        }
    }

    // FCM Notification
    public static function sendFcmNotificationToken($tokens, $heading, $text, $image = null)
    {
        if (empty($tokens)) {
            return false;
        }

        $title = $heading;
        $description = $text;
        $projectId = config('services.fcm.parent_project_id');
        $credentialsFilePath = Storage::path('json/firebase-adminsdk-4lr71.json');
        $client = new GoogleClient();
        $client->setAuthConfig($credentialsFilePath);
        $client->addScope('https://www.googleapis.com/auth/firebase.messaging');
        $client->refreshTokenWithAssertion();
        $token = $client->getAccessToken();

        $access_token = $token['access_token'];

        $headers = [
            "Authorization: Bearer $access_token",
            'Content-Type: application/json',
        ];

        // Split to 1000 chunks
        $chunks = array_chunk($tokens, 950);
        $response = [];
        foreach ($chunks as $chunk) {
            foreach ($chunk as $token) {
                # code...
                $data = [
                    "message" => [
                        'notification' => [
                            'title' => $title,
                            'body' => $description,
                            'image' => $image ?? "https://school.edukrypt.app/public/logo.png"
                        ],
                        "token" => $token
                    ]
                ];
                $payload = json_encode($data);
                // dd($payload);
                $ch = curl_init();
                curl_setopt($ch, CURLOPT_URL, "https://fcm.googleapis.com/v1/projects/$projectId/messages:send");
                curl_setopt($ch, CURLOPT_POST, true);
                curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
                curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
                curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
                curl_setopt($ch, CURLOPT_POSTFIELDS, $payload);
                curl_setopt($ch, CURLOPT_VERBOSE, true); // Enable verbose output for debugging
                $res = curl_exec($ch);
                $err = curl_error($ch);
                curl_close($ch);
                $response[] = $res;
            }
        }
        return true;
    }
}