feat(notifications): Handle some edge cases

app/src/main/java/com/p_vacho/neat_calendar/activities/NotificationsActivity.kt

@@ -90,7 +90,11 @@ class NotificationsActivity : AppCompatActivity() {
     }
 
     private fun getInvitationData(invitationId: String, rvPosition: Int): InvitationResponse? {
-        return invitations[invitationId]
+        val ret = invitations[invitationId]
+        if (ret == null) {
+            Log.w("NotificationsActivity", "NotificationAdapter requested unknown invitation: $invitationId")
+        }
+        return ret
     }
 
     private fun getUserData(userId: String, rvPosition: Int?): UserResponse? {

app/src/main/java/com/p_vacho/neat_calendar/adapters/NotificationAdapter.kt

@@ -88,33 +88,72 @@ class NotificationAdapter(
         val user = getUserData(usernameId, position)
         val username = user?.username ?: "Unknown User"
 
+        val statusSuffix = when (invitation.status) {
+            "accepted" -> " [already accepted]"
+            "declined" -> " [already declined]"
+            "pending" -> ""
+            else -> throw IllegalStateException("Unexpected invitation status: ${invitation.status} for invitation ID: ${invitation.id}")
+        }
+
         return when (notification.message) {
-            "new-invitation" -> "You have received an event invitation from @$username"
-            "invitation-accepted" -> "@$username has accepted your event invitation"
-            "invitation-declined" -> "@$username has declined your event invitation"
+            "new-invitation" -> "You have received an event invitation from @$username$statusSuffix"
+            "invitation-accepted" -> "@$username has accepted your event invitation$statusSuffix"
+            "invitation-declined" -> "@$username has declined your event invitation$statusSuffix"
             else -> throw IllegalArgumentException("Unexpected notification message: ${notification.message}")
         }
     }
 
+
     private fun handleInvitationActions(
         holder: NotificationViewHolder,
         notification: NotificationResponse,
         position: Int
     ) {
         if (notification.event_type == "invitation") {
+            val invitation = getInvitationData(notification.data, position)
+            if (invitation == null) {
+                // For deleted invitations, make all the buttons visible but unclickable & grayed out
+                holder.invitationActions.visibility = View.VISIBLE
+                holder.acceptButton.visibility = View.VISIBLE
+                holder.declineButton.visibility = View.VISIBLE
+                holder.viewEventButton.visibility = View.VISIBLE
+
+                holder.acceptButton.isEnabled = false
+                holder.declineButton.isEnabled = false
+                holder.viewEventButton.isEnabled = false
+
+                return
+            }
+
             when (notification.message) {
                 "new-invitation" -> {
-                    // Show Accept/Decline & View buttons
-                    holder.invitationActions.visibility = View.VISIBLE
-                    holder.acceptButton.visibility = View.VISIBLE
-                    holder.declineButton.visibility = View.VISIBLE
-                    holder.viewEventButton.visibility = View.VISIBLE
+                    when (invitation.status) {
+                        "pending" -> {
+                            // Show Accept/Decline & View buttons
+                            holder.invitationActions.visibility = View.VISIBLE
+                            holder.acceptButton.visibility = View.VISIBLE
+                            holder.declineButton.visibility = View.VISIBLE
+                            holder.viewEventButton.visibility = View.VISIBLE
 
-                    holder.acceptButton.setOnClickListener {
-                        onActionClick(notification, Action.ACCEPT, position)
-                    }
-                    holder.declineButton.setOnClickListener {
-                        onActionClick(notification, Action.DECLINE, position)
+                            holder.acceptButton.setOnClickListener {
+                                onActionClick(notification, Action.ACCEPT, position)
+                            }
+                            holder.declineButton.setOnClickListener {
+                                onActionClick(notification, Action.DECLINE, position)
+                            }
+                        }
+                        "accepted", "declined" -> {
+                            // Show only View button
+                            holder.invitationActions.visibility = View.VISIBLE
+                            holder.acceptButton.visibility = View.GONE
+                            holder.declineButton.visibility = View.GONE
+                            holder.viewEventButton.visibility = View.VISIBLE
+
+                            holder.viewEventButton.setOnClickListener {
+                                onActionClick(notification, Action.VIEW_EVENT, position)
+                            }
+                        }
+                        else -> throw IllegalStateException("Unexpected invitation status: ${invitation.status} for invite ID: ${invitation.id}")
                     }
                 }
                 "invitation-accepted", "invitation-declined" -> {