Add a Low Priority room filter behind a feature flag. (#4394)

* Add Low Priority room filter with incompatibility rules

Co-authored-by: pixlwave <6060466+pixlwave@users.noreply.github.com>

* Add a feature flag and use the SDK filters.

* Fix filter tests and add RoomSummaryProvider tests for the default filters.

* Remove unnecessary comment.

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: pixlwave <6060466+pixlwave@users.noreply.github.com>
Co-authored-by: Doug <douglase@element.io>

ElementX/Sources/Screens/HomeScreen/View/Filters/RoomListFilterModels.swift

@@ -21,6 +21,7 @@ enum RoomListFilter: Int, CaseIterable, Identifiable {
     case rooms
     case favourites
     case invites
+    case lowPriority
     
     static var availableFilters: [RoomListFilter] {
         RoomListFilter.allCases
@@ -38,6 +39,8 @@ enum RoomListFilter: Int, CaseIterable, Identifiable {
             return L10n.screenRoomlistFilterFavourites
         case .invites:
             return L10n.screenRoomlistFilterInvites
+        case .lowPriority:
+            return L10n.screenRoomlistFilterLowPriority
         }
     }
     
@@ -50,10 +53,11 @@ enum RoomListFilter: Int, CaseIterable, Identifiable {
         case .unreads:
             return [.invites]
         case .favourites:
-            // When we will have Low Priority we may need to return it here
-            return [.invites]
+            return [.invites, .lowPriority]
         case .invites:
-            return [.rooms, .people, .unreads, .favourites]
+            return [.rooms, .people, .unreads, .favourites, .lowPriority]
+        case .lowPriority:
+            return [.favourites, .invites]
         }
     }
     
@@ -69,20 +73,29 @@ enum RoomListFilter: Int, CaseIterable, Identifiable {
             return .all(filters: [.favourite, .joined])
         case .invites:
             return .invite
+        case .lowPriority:
+            // Note: When not activated, the setFilter method automatically applies the .nonLowPriority filter.
+            return .all(filters: [.lowPriority, .joined])
         }
     }
 }
 
 struct RoomListFiltersState {
     private(set) var activeFilters: OrderedSet<RoomListFilter>
+    private let appSettings: AppSettings
     
-    init(activeFilters: OrderedSet<RoomListFilter> = []) {
+    init(activeFilters: OrderedSet<RoomListFilter> = [], appSettings: AppSettings) {
         self.activeFilters = .init(activeFilters)
+        self.appSettings = appSettings
     }
     
     var availableFilters: [RoomListFilter] {
         var availableFilters = OrderedSet(RoomListFilter.availableFilters)
         
+        if !appSettings.lowPriorityFilterEnabled {
+            availableFilters.remove(.lowPriority)
+        }
+        
         for filter in activeFilters {
             availableFilters.remove(filter)
             filter.incompatibleFilters.forEach { availableFilters.remove($0) }

ElementX/Sources/Screens/HomeScreen/View/Filters/RoomListFilterView.swift

@@ -19,13 +19,6 @@ struct RoomListFilterView: View {
     }
 }
 
-struct RoomListFilterView_Previews: PreviewProvider, TestablePreview {
-    static var previews: some View {
-        RoomListFilterView(filter: .people, isActive: .constant(false))
-        RoomListFilterView(filter: .people, isActive: .constant(true))
-    }
-}
-
 private struct FilterToggleStyle: ToggleStyle {
     private func strokeColor(isOn: Bool) -> Color {
         isOn ? .compound.bgActionPrimaryRest : .compound.borderInteractiveSecondary
@@ -59,3 +52,12 @@ private struct FilterToggleStyle: ToggleStyle {
             }
     }
 }
+
+// MARK: - Previews
+
+struct RoomListFilterView_Previews: PreviewProvider, TestablePreview {
+    static var previews: some View {
+        RoomListFilterView(filter: .people, isActive: .constant(false))
+        RoomListFilterView(filter: .people, isActive: .constant(true))
+    }
+}

ElementX/Sources/Screens/HomeScreen/View/Filters/RoomListFiltersEmptyStateView.swift

@@ -23,6 +23,8 @@ struct RoomListFiltersEmptyStateView: View {
                 return L10n.screenRoomlistFilterFavouritesEmptyStateTitle
             case .invites:
                 return L10n.screenRoomlistFilterInvitesEmptyStateTitle
+            case .lowPriority:
+                return L10n.screenRoomlistFilterLowPriorityEmptyStateTitle
             }
         }
         return L10n.screenRoomlistFilterMixedEmptyStateTitle
@@ -55,9 +57,11 @@ struct RoomListFiltersEmptyStateView_Previews: PreviewProvider, TestablePreview
     static var previews: some View {
         VStack(spacing: 24) {
             ForEach(RoomListFilter.allCases) { filter in
-                RoomListFiltersEmptyStateView(state: .init(activeFilters: [filter]))
+                RoomListFiltersEmptyStateView(state: .init(activeFilters: [filter],
+                                                           appSettings: ServiceLocator.shared.settings))
             }
-            RoomListFiltersEmptyStateView(state: .init(activeFilters: [.people, .favourites]))
+            RoomListFiltersEmptyStateView(state: .init(activeFilters: [.people, .favourites],
+                                                       appSettings: ServiceLocator.shared.settings))
         }
         .padding(.bottom)
         .previewLayout(.sizeThatFits)

ElementX/Sources/Screens/HomeScreen/View/Filters/RoomListFiltersView.swift

@@ -87,7 +87,10 @@ struct RoomListFiltersView: View {
 
 struct RoomListFiltersView_Previews: PreviewProvider, TestablePreview {
     static var previews: some View {
-        RoomListFiltersView(state: .constant(.init()))
-        RoomListFiltersView(state: .constant(.init(activeFilters: [.rooms, .favourites])))
+        RoomListFiltersView(state: .constant(.init(appSettings: ServiceLocator.shared.settings)))
+        RoomListFiltersView(state: .constant(.init(activeFilters: [.rooms, .favourites],
+                                                   appSettings: ServiceLocator.shared.settings)))
+        RoomListFiltersView(state: .constant(.init(activeFilters: [.lowPriority],
+                                                   appSettings: ServiceLocator.shared.settings)))
     }
 }