<?php

namespace App\Services;

use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\Log;

class FcmService
{
    private string $projectId;
    private ?string $serverKey;

    public function __construct()
    {
        $this->projectId  = config('services.firebase.project_id', 'animexeapp');
        $this->serverKey  = config('services.firebase.server_key');
    }

    /**
     * Send push notification to a single FCM token.
     */
    public function sendToToken(string $token, string $title, string $body, array $data = []): bool
    {
        if (!$this->serverKey) {
            Log::warning('FCM server key not configured');
            return false;
        }

        try {
            $response = Http::withHeaders([
                'Authorization' => 'key=' . $this->serverKey,
                'Content-Type'  => 'application/json',
            ])->post('https://fcm.googleapis.com/fcm/send', [
                'to'           => $token,
                'notification' => [
                    'title' => $title,
                    'body'  => $body,
                    'sound' => 'default',
                ],
                'data'         => $data,
                'priority'     => 'high',
            ]);

            return $response->successful();
        } catch (\Throwable $e) {
            Log::error('FCM send error: ' . $e->getMessage());
            return false;
        }
    }

    /**
     * Send to multiple tokens (batch).
     */
    public function sendToTokens(array $tokens, string $title, string $body, array $data = []): int
    {
        if (!$this->serverKey || empty($tokens)) return 0;

        $sent = 0;
        // FCM supports max 1000 tokens per batch
        foreach (array_chunk($tokens, 1000) as $chunk) {
            try {
                $response = Http::withHeaders([
                    'Authorization' => 'key=' . $this->serverKey,
                    'Content-Type'  => 'application/json',
                ])->post('https://fcm.googleapis.com/fcm/send', [
                    'registration_ids' => $chunk,
                    'notification'     => [
                        'title' => $title,
                        'body'  => $body,
                        'sound' => 'default',
                    ],
                    'data'             => $data,
                    'priority'         => 'high',
                ]);

                if ($response->successful()) {
                    $sent += count($chunk);
                }
            } catch (\Throwable $e) {
                Log::error('FCM batch send error: ' . $e->getMessage());
            }
        }
        return $sent;
    }
}