/**
 * Service Worker Registration Plugin
 * Registers the service worker globally when the app loads
 * This ensures push notifications work even when not on the orders page
 */

export default defineNuxtPlugin(async () => {
  if (process.client && 'serviceWorker' in navigator) {
    // Register service worker on app load
    navigator.serviceWorker.register('/sw-notifications.js', {
      scope: '/'
    })
      .then(async (registration) => {
        console.log('[SW] Service Worker registered globally:', registration.scope)

        // Check for updates periodically
        registration.addEventListener('updatefound', () => {
          const newWorker = registration.installing
          console.log('[SW] New service worker found, installing...')

          newWorker?.addEventListener('statechange', () => {
            if (newWorker.state === 'installed' && navigator.serviceWorker.controller) {
              console.log('[SW] New version available, will activate on next page load')
            }
          })
        })

        // Ensure push subscription exists if permission was granted
        // This makes sure the app appears in Android notification settings
        try {
          await navigator.serviceWorker.ready

          if ('Notification' in window && Notification.permission === 'granted') {
            const subscription = await registration.pushManager.getSubscription()
            if (subscription) {
              console.log('[SW] ✅ Push subscription active - app will appear in notification settings')
            } else {
              console.log('[SW] ⚠️ Permission granted but no subscription - user needs to re-enable notifications')
            }
          }
        } catch (error) {
          console.error('[SW] Error checking push subscription:', error)
        }
      })
      .catch((error) => {
        console.error('[SW] Service Worker registration failed:', error)
      })

    // Handle service worker updates
    navigator.serviceWorker.addEventListener('controllerchange', () => {
      console.log('[SW] Service Worker updated, reloading page...')
      window.location.reload()
    })
  }
})