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? {
@@ -131,10 +135,30 @@ class NotificationsActivity : AppCompatActivity() {
     private fun handleNotificationAction(notification: NotificationResponse, action: NotificationAdapter.Action, position: Int) {
         when (action) {
             NotificationAdapter.Action.ACCEPT -> {
-                // TODO: Handle accept action
+                lifecycleScope.launch(Dispatchers.IO) {
+                    val invitationId = notification.data
+                    RetrofitClient.invitationService.acceptInvitation(invitationId)
+
+                    withContext(Dispatchers.Main) {
+                        Toast.makeText(this@NotificationsActivity, "Invitation accepted", Toast.LENGTH_SHORT).show()
+
+                        // Also mark the notification as read after the interaction
+                        if (!notification.read) handleNotificationClick(notification, position, false)
+                    }
+                }
             }
             NotificationAdapter.Action.DECLINE -> {
-                // TODO: Handle decline action
+                lifecycleScope.launch(Dispatchers.IO) {
+                    val invitationId = notification.data
+                    RetrofitClient.invitationService.declineInvitation(invitationId)
+
+                    withContext(Dispatchers.Main) {
+                        Toast.makeText(this@NotificationsActivity, "Invitation declined", Toast.LENGTH_SHORT).show()
+
+                        // Also mark the notification as read after the interaction
+                        if (!notification.read) handleNotificationClick(notification, position, false)
+                    }
+                }
             }
             NotificationAdapter.Action.VIEW_EVENT -> {
                 // TODO: Handle viewing the event
@@ -142,7 +166,7 @@ class NotificationsActivity : AppCompatActivity() {
         }
     }
 
-    private fun handleNotificationClick(notification: NotificationResponse, position: Int) {
+    private fun handleNotificationClick(notification: NotificationResponse, position: Int, sendToast: Boolean = true) {
         lifecycleScope.launch {
             val updatedNotification =
                 RetrofitClient.notificationsService.markNotificationRead(notification.id)
@@ -151,7 +175,10 @@ class NotificationsActivity : AppCompatActivity() {
             val adapter = rvNotifications.adapter as NotificationAdapter
             adapter.notifyItemChanged(position)
 
-            Toast.makeText(this@NotificationsActivity, "Marked as read", Toast.LENGTH_SHORT).show()
+            if (sendToast) {
+                Toast.makeText(this@NotificationsActivity, "Marked as read", Toast.LENGTH_SHORT)
+                    .show()
+            }
         }
     }
 }

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

@@ -88,22 +88,47 @@ 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" -> {
+                    when (invitation.status) {
+                        "pending" -> {
                             // Show Accept/Decline & View buttons
                             holder.invitationActions.visibility = View.VISIBLE
                             holder.acceptButton.visibility = View.VISIBLE
@@ -117,6 +142,20 @@ class NotificationAdapter(
                                 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" -> {
                     // Show only View button
                     holder.invitationActions.visibility = View.VISIBLE