<?php

namespace App\Services\Push;

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

/**
 * Legacy FCM HTTP API driver. Activates when FCM_SERVER_KEY is set;
 * falls back to LogPushDriver via AppServiceProvider when missing.
 *
 * For HTTP v1 / Firebase Admin SDK migration, swap out this driver.
 */
class FcmPushDriver implements PushDriver
{
    public function __construct(
        private readonly string $serverKey,
        private readonly string $endpoint = 'https://fcm.googleapis.com/fcm/send',
    ) {}

    public function send(string $token, string $title, string $body, array $data = []): PushResult
    {
        if (empty($this->serverKey)) {
            return PushResult::failure('fcm_not_configured');
        }

        try {
            $response = Http::withHeaders([
                'Authorization' => 'key='.$this->serverKey,
                'Content-Type' => 'application/json',
            ])->timeout(10)->post($this->endpoint, [
                'to' => $token,
                'notification' => ['title' => $title, 'body' => $body],
                'data' => $data,
            ]);
        } catch (ConnectionException $e) {
            return PushResult::failure('connection_failed');
        }

        if (! $response->successful()) {
            Log::warning('FCM send failed', ['status' => $response->status(), 'body' => $response->body()]);

            return PushResult::failure('provider_error_'.$response->status());
        }

        $msgId = (string) ($response->json('message_id') ?? $response->json('multicast_id') ?? '');

        return PushResult::success($msgId !== '' ? $msgId : null);
    }
}