ios: search names and the directory from New chat

The New chat sheet gets the chat list's online search: a "Search in
Directory" row, the keyboard Search key for names and the directory,
and Names and Directory sections after the contacts. Tapping a result
connects and closes the sheet, as other New chat actions do. A contact
the list already shows is not repeated as a name result, and the
contacts list's empty state stays hidden while a search runs or shows
results. Archived contacts, which share the search bar and the list,
are unchanged.

Run: 002-ios-directory-search-ui, slice 4

apps/ios/Shared/Views/NewChat/NewChatMenuButton.swift

@@ -43,6 +43,7 @@ struct NewChatSheet: View {
     @State private var searchChatFilteredBySimplexLink: String? = nil
     // when the search text is a SimpleX name, the string to connect to (with @/# preserved); nil otherwise
     @State private var connectNameCandidate: String? = nil
+    @StateObject private var onlineSearch = OnlineSearchModel()
     @State private var alert: SomeAlert?
 
     // Sheet height management
@@ -52,6 +53,7 @@ struct NewChatSheet: View {
     @State private var allowSmallSheet = true
 
     @AppStorage(GROUP_DEFAULT_ONE_HAND_UI, store: groupDefaults) private var oneHandUI = true
+    @AppStorage(DEFAULT_SHOW_UNREAD_AND_FAVORITES) private var showUnreadAndFavorites = false
 
     var body: some View {
         let showArchive = chatModel.chats.contains { $0.chatInfo.contact?.chatDeleted == true }
@@ -90,10 +92,11 @@ struct NewChatSheet: View {
                     searchText: $searchText,
                     searchShowingSimplexLink: $searchShowingSimplexLink,
                     searchChatFilteredBySimplexLink: $searchChatFilteredBySimplexLink,
-                    connectNameCandidate: $connectNameCandidate
+                    connectNameCandidate: $connectNameCandidate,
+                    onSearch: runOnlineSearch
                 )
                 .frame(maxWidth: .infinity)
-                if let candidate = connectNameCandidate {
+                if let candidate = connectNameCandidate, onlineSearch.names.isEmpty {
                     ConnectByNameRow(
                         name: candidate,
                         searchText: $searchText,
@@ -102,6 +105,9 @@ struct NewChatSheet: View {
                         dismiss: true
                     )
                 }
+                if !searchTrimmed.isEmpty, !searchShowingSimplexLink {
+                    SearchInDirectoryRow(searchFocussed: $searchFocussed, onSearch: runDirectorySearch)
+                }
             }
             .listRowSeparator(.hidden)
             .listRowBackground(Color.clear)
@@ -155,7 +161,16 @@ struct NewChatSheet: View {
                     }
                 }
             }
-            
+
+            let shownContacts = ContactsList.shownChats(
+                chats: chatModel.chats,
+                predicate: contactListChatPredicate,
+                searchText: searchText,
+                searchShowingSimplexLink: searchShowingSimplexLink,
+                searchChatFilteredBySimplexLink: searchChatFilteredBySimplexLink,
+                showUnreadAndFavorites: showUnreadAndFavorites
+            ).shown
+            let rows = onlineSearch.rows(shownChatIds: Set(shownContacts.map { $0.id }))
             ContactsList(
                 chatPredicate: contactListChatPredicate,
                 searchMode: $searchMode,
@@ -164,9 +179,71 @@ struct NewChatSheet: View {
                 searchFocussed: $searchFocussed,
                 searchShowingSimplexLink: $searchShowingSimplexLink,
                 searchChatFilteredBySimplexLink: $searchChatFilteredBySimplexLink,
-                showDeletedChatIcon: true
+                showDeletedChatIcon: true,
+                showsEmptyState: !onlineSearch.searching && rows.isEmpty
             )
+            onlineSearchSections(rows)
         }
+        .onChange(of: searchText) { _ in
+            onlineSearch.reset()
+        }
+    }
+
+    @ViewBuilder private func onlineSearchSections(_ rows: OnlineSearchRows) -> some View {
+        if !rows.names.isEmpty {
+            Section {
+                ForEach(rows.names) { result in
+                    NameSearchRow(result: result)
+                        .onTapGesture {
+                            searchFocussed = false
+                            planAndConnect(result.target, theme: theme, dismiss: true, cleanup: nil)
+                        }
+                }
+            } header: {
+                onlineSearchHeader("Names")
+            }
+        }
+        if !rows.directory.isEmpty || rows.footer != nil {
+            Section {
+                ForEach(rows.directory) { result in
+                    DirectorySearchRow(entry: result.entry)
+                        .onTapGesture {
+                            searchFocussed = false
+                            planAndConnect(result.entry.link, theme: theme, dismiss: true, cleanup: nil)
+                        }
+                }
+                switch rows.footer {
+                case .retry: DirectoryRetryRow(onlineSearch: onlineSearch)
+                case .showMore: DirectoryShowMoreRow(onlineSearch: onlineSearch)
+                case nil: EmptyView()
+                }
+            } header: {
+                onlineSearchHeader("Directory")
+            }
+        }
+    }
+
+    private func onlineSearchHeader(_ title: LocalizedStringKey) -> some View {
+        Text(title)
+            .textCase(.uppercase)
+            .foregroundColor(theme.colors.secondary)
+    }
+
+    private var searchTrimmed: String {
+        searchText.trimmingCharacters(in: .whitespaces)
+    }
+
+    private func runDirectorySearch() {
+        let text = searchTrimmed
+        guard !text.isEmpty, !searchShowingSimplexLink else { return }
+        confirmDirectorySearch { Task { await onlineSearch.searchDirectory(text) } }
+    }
+
+    private func runOnlineSearch() {
+        let text = searchTrimmed
+        guard !text.isEmpty, !searchShowingSimplexLink else { return }
+        let name = connectNameCandidate
+        confirmDirectorySearch { Task { await onlineSearch.search(text, name: name) } }
     }
 
     private func contactListChatPredicate(_ chat: Chat, _ withSearch: Bool) -> Bool {
@@ -231,8 +308,9 @@ struct ContactsList: View {
     @Binding var searchShowingSimplexLink: Bool
     @Binding var searchChatFilteredBySimplexLink: String?
     var showDeletedChatIcon: Bool
+    var showsEmptyState = true
     @AppStorage(DEFAULT_SHOW_UNREAD_AND_FAVORITES) private var showUnreadAndFavorites = false
-    
+
     var body: some View {
         let (contactChats, filteredContactChats) = Self.shownChats(
             chats: chatModel.chats,
@@ -259,10 +337,12 @@ struct ContactsList: View {
             }
         }
         
-        if filteredContactChats.isEmpty && !contactChats.isEmpty {
-            noResultSection(text: "No filtered contacts")
-        } else if contactChats.isEmpty {
-            noResultSection(text: "No contacts")
+        if showsEmptyState {
+            if filteredContactChats.isEmpty && !contactChats.isEmpty {
+                noResultSection(text: "No filtered contacts")
+            } else if contactChats.isEmpty {
+                noResultSection(text: "No contacts")
+            }
         }
     }
     
@@ -359,6 +439,7 @@ struct ContactsListSearchBar: View {
     @Binding var searchShowingSimplexLink: Bool
     @Binding var searchChatFilteredBySimplexLink: String?
     @Binding var connectNameCandidate: String?
+    var onSearch: (() -> Void)? = nil
     @State private var ignoreSearchTextChange = false
     @AppStorage(DEFAULT_SHOW_UNREAD_AND_FAVORITES) private var showUnreadAndFavorites = false
 
@@ -376,6 +457,8 @@ struct ContactsListSearchBar: View {
                     .disabled(searchShowingSimplexLink)
                     .focused($searchFocussed)
                     .frame(maxWidth: .infinity)
+                    .submitLabel(onSearch == nil ? .return : .search)
+                    .onSubmit { onSearch?() }
                 if connectProgressManager.showConnectProgress != nil {
                     ProgressView()
                 }