Moderation tweaks (#2548)

* Only allow admins to see the roles and permissions screen.

* Hide the selection checkbox on Admins when changing roles.

* Show an empty state for banned users.

* Add separate actions for ban and remove.

* Implement reset permissions and demote self alerts.

* Add tests for resetting permissions and demoting self.

* Add a warning when promoting someone to administrator.

ElementX/Sources/Services/Room/RoomProxy.swift

@@ -391,6 +391,24 @@ class RoomProxy: RoomProxyProtocol {
         }
     }
     
+    func resetPowerLevels() async -> Result<RoomPowerLevels, RoomProxyError> {
+        do {
+            return try await .success(room.resetPowerLevels())
+        } catch {
+            MXLog.error("Failed resetting the power levels: \(error)")
+            return .failure(.failedSettingPermission)
+        }
+    }
+    
+    func suggestedRole(for userID: String) async -> Result<RoomMemberRole, RoomProxyError> {
+        do {
+            return try await .success(room.suggestedRoleForUser(userId: userID))
+        } catch {
+            MXLog.error("Failed getting a user's role: \(error)")
+            return .failure(.failedCheckingPermission)
+        }
+    }
+    
     func updatePowerLevelsForUsers(_ updates: [(userID: String, powerLevel: Int64)]) async -> Result<Void, RoomProxyError> {
         do {
             let updates = updates.map { UserPowerLevelUpdate(userId: $0.userID, powerLevel: $0.powerLevel) }

ElementX/Sources/Services/Room/RoomProxyProtocol.swift

@@ -117,6 +117,8 @@ protocol RoomProxyProtocol {
     
     func powerLevels() async -> Result<RoomPowerLevels, RoomProxyError>
     func applyPowerLevelChanges(_ changes: RoomPowerLevelChanges) async -> Result<Void, RoomProxyError>
+    func resetPowerLevels() async -> Result<RoomPowerLevels, RoomProxyError>
+    func suggestedRole(for userID: String) async -> Result<RoomMemberRole, RoomProxyError>
     func updatePowerLevelsForUsers(_ updates: [(userID: String, powerLevel: Int64)]) async -> Result<Void, RoomProxyError>
     func canUser(userID: String, sendStateEvent event: StateEventType) async -> Result<Bool, RoomProxyError>
     func canUserInvite(userID: String) async -> Result<Bool, RoomProxyError>