handleWebhookNotification

/**
 * Handle incoming webhook notification and sync events
 *
 * @param array $headers
 * @return bool
 */
public function handleWebhookNotification(array $headers)
{
    try {
        $channelId = $headers['X-Goog-Channel-ID'] ?? null;
        $resourceId = $headers['X-Goog-Resource-ID'] ?? null;
        $resourceState = $headers['X-Goog-Resource-State'] ?? null;

        if (!$channelId || !$resourceId) {
            Log::error('Missing required webhook headers');
            return false;
        }

        // Find the relevant webhook in our database
        $webhook = CalendarWebhook::where('channel_id', $channelId)
            ->where('resource_id', $resourceId)
            ->first();

        if (!$webhook) {
            Log::error('Webhook not found for channel: ' . $channelId);
            return false;
        }

        $user = User::find($webhook->user_id);

        if (!$user) {
            Log::error('User not found for webhook: ' . $webhook->id);
            return false;
        }

        // Set user's token for API access
        if ($user->google_token) {
            $this->client->setAccessToken($user->google_token);

            // Refresh token if expired
            if ($this->client->isAccessTokenExpired()) {
                $this->client->fetchAccessTokenWithRefreshToken($this->client->getRefreshToken());
                $user->google_token = $this->client->getAccessToken();
                $user->save();
            }
        }

        if ($resourceState === 'sync') {
            // This is just a sync message, no action needed
            return true;
        } elseif ($resourceState === 'exists' || $resourceState === 'not_exists') {
            // Get the sync token to do a partial sync
            $syncToken = $webhook->sync_token ?? null;

            // Process changes from Google Calendar
            $this->syncEvents($user, $webhook->calendar_id, $syncToken);

            return true;
        }

        return false;
    } catch (\Exception $e) {
        Log::error('Error handling Google Calendar webhook: ' . $e->getMessage());
        return false;
    }
}