Added PWA support (#40)

app/actions/push.ts

@@ -0,0 +1,49 @@
+'use server'
+
+import webpush from 'web-push'
+
+webpush.setVapidDetails(
+  'mailto:mydohsimpson@gmail.com',
+  process.env.NEXT_PUBLIC_VAPID_PUBLIC_KEY!,
+  process.env.VAPID_PRIVATE_KEY!
+)
+
+interface PushSubscriptionWithKeys extends PushSubscription {
+  keys: {
+    p256dh: string
+    auth: string
+  }
+}
+
+let subscription: PushSubscriptionWithKeys | null = null
+
+export async function subscribeUser(sub: PushSubscriptionWithKeys) {
+  subscription = sub
+  return { success: true }
+}
+
+export async function unsubscribeUser() {
+  subscription = null
+  return { success: true }
+}
+
+export async function sendNotification(message: string) {
+  if (!subscription) {
+    throw new Error('No subscription available')
+  }
+
+  try {
+    await webpush.sendNotification(
+      subscription,
+      JSON.stringify({
+        title: 'HabitTrove',
+        body: message,
+        icon: '/icon.png',
+      })
+    )
+    return { success: true }
+  } catch (error) {
+    console.error('Error sending push notification:', error)
+    return { success: false, error: 'Failed to send notification' }
+  }
+}