refactor(local-currency): extract CurrencyItem and debounce filtering

Author: jeanpierreroma

DashWallet.xcodeproj/project.pbxproj

@@ -507,6 +507,8 @@
 		5151CD632F926D1900F0A604 /* SearchBar.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5151CD612F926D1900F0A604 /* SearchBar.swift */; };
 		5151CDF02F928D7D00F0A604 /* LocalCurrencyCellView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5151CDEF2F928D7D00F0A604 /* LocalCurrencyCellView.swift */; };
 		5151CDF12F928D7D00F0A604 /* LocalCurrencyCellView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5151CDEF2F928D7D00F0A604 /* LocalCurrencyCellView.swift */; };
+		5151CE182F9624D000F0A604 /* CurrencyItem.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5151CE172F9624D000F0A604 /* CurrencyItem.swift */; };
+		5151CE192F9624D000F0A604 /* CurrencyItem.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5151CE172F9624D000F0A604 /* CurrencyItem.swift */; };
 		7502A4872AE401EF00ACDDD3 /* UsernameVotingViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7502A4862AE401EF00ACDDD3 /* UsernameVotingViewController.swift */; };
 		7503643A2C89CFB70029EC0D /* CoinJoinProgressView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 750364392C89CFB70029EC0D /* CoinJoinProgressView.swift */; };
 		7503643B2C89CFB70029EC0D /* CoinJoinProgressView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 750364392C89CFB70029EC0D /* CoinJoinProgressView.swift */; };
@@ -2475,6 +2477,7 @@
 		5151CA222F92335E00F0A604 /* LocalCurrencyViewModel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LocalCurrencyViewModel.swift; sourceTree = "<group>"; };
 		5151CD612F926D1900F0A604 /* SearchBar.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SearchBar.swift; sourceTree = "<group>"; };
 		5151CDEF2F928D7D00F0A604 /* LocalCurrencyCellView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LocalCurrencyCellView.swift; sourceTree = "<group>"; };
+		5151CE172F9624D000F0A604 /* CurrencyItem.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CurrencyItem.swift; sourceTree = "<group>"; };
 		62C1F7A3ABEE7CF3BBB270C4 /* Pods-DashWalletTests.testflight.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-DashWalletTests.testflight.xcconfig"; path = "Target Support Files/Pods-DashWalletTests/Pods-DashWalletTests.testflight.xcconfig"; sourceTree = "<group>"; };
 		67217DE34817FB304EDEA8D4 /* Pods-dashpay.testnet.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-dashpay.testnet.xcconfig"; path = "Target Support Files/Pods-dashpay/Pods-dashpay.testnet.xcconfig"; sourceTree = "<group>"; };
 		6A44C167AF8F881176AFB256 /* Pods-TodayExtension.testflight.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-TodayExtension.testflight.xcconfig"; path = "Target Support Files/Pods-TodayExtension/Pods-TodayExtension.testflight.xcconfig"; sourceTree = "<group>"; };
@@ -4332,6 +4335,7 @@
 				2AA87CF926E5681100F0CEA6 /* DWCurrencyObject.m */,
 				2ACD53E6234BADD300650AD3 /* DWCurrencyItem.h */,
 				2AA87CFB26E568A100F0CEA6 /* DWCurrencyItemPriceProvider.h */,
+				5151CE172F9624D000F0A604 /* CurrencyItem.swift */,
 			);
 			path = LocalCurrency;
 			sourceTree = "<group>";
@@ -8668,6 +8672,7 @@
 				47AE8BF428C1306000490F5E /* FetchingNextPageCell.swift in Sources */,
 				47081197298CF20C003FCA3D /* Transaction.swift in Sources */,
 				47AE8BE628C1305F00490F5E /* AllMerchantLocationsViewController.swift in Sources */,
+				5151CE192F9624D000F0A604 /* CurrencyItem.swift in Sources */,
 				2ACCD84D23180E7E00A96B62 /* DWPaymentOutput.m in Sources */,
 				2AB3415E23A8133A004E37A7 /* DWPayModelStub.m in Sources */,
 				2A74EFF1230531DA00C475EB /* DWRecoverContentView.m in Sources */,
@@ -9337,6 +9342,7 @@
 				C9D2C6BB2A320AA000D15901 /* DWFormTableViewController.m in Sources */,
 				C943B34D2A40A4C500AF23C5 /* DWInfoPopupViewController.m in Sources */,
 				75F990822AFD1065006759AB /* UsernameRequestDetailsViewController.swift in Sources */,
+				5151CE182F9624D000F0A604 /* CurrencyItem.swift in Sources */,
 				C943B32A2A408CED00AF23C5 /* DWAvatarExternalSourceView.m in Sources */,
 				C9D2C6BC2A320AA000D15901 /* WalletKeysOverviewModel.swift in Sources */,
 				C9D2C6BD2A320AA000D15901 /* UIAssembly.swift in Sources */,

DashWallet/Sources/UI/Menu/Settings/LocalCurrency/CurrencyItem.swift

@@ -0,0 +1,26 @@
+//  
+//  Created by Roman Chornyi
+//  Copyright © 2026 Dash Core Group. All rights reserved.
+//
+//  Licensed under the MIT License (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//  https://opensource.org/licenses/MIT
+//
+//  Unless required by applicable law or agreed to in writing, software
+//  distributed under the License is distributed on an "AS IS" BASIS,
+//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//  See the License for the specific language governing permissions and
+//  limitations under the License.
+//
+
+import Foundation
+
+struct CurrencyItem: Identifiable, Equatable {
+    var id: String { code }
+    let code: String
+    let name: String
+    let flagName: String?
+    let priceString: String?
+}

DashWallet/Sources/UI/Menu/Settings/LocalCurrency/LocalCurrencyViewModel.swift

@@ -18,34 +18,15 @@
 import Foundation
 import Combine
 
-// MARK: - CurrencyItem
-
-struct CurrencyItem: Identifiable, Equatable {
-    var id: String { code }
-    let code: String
-    let name: String
-    let flagName: String?
-    let priceString: String?
-}
-
-// MARK: - LocalCurrencyViewModel
-
 @MainActor
 class LocalCurrencyViewModel: ObservableObject {
     private let allItems: [CurrencyItem]
+    private var cancellables = Set<AnyCancellable>()
 
     @Published var searchQuery: String = ""
+    @Published private(set) var filteredItems: [CurrencyItem] = []
     @Published var selectedCurrencyCode: String
 
-    var filteredItems: [CurrencyItem] {
-        let trimmed = searchQuery.trimmingCharacters(in: .whitespaces)
-        guard !trimmed.isEmpty else { return allItems }
-        let query = trimmed.lowercased()
-        return allItems.filter {
-            $0.code.lowercased().contains(query) || $0.name.lowercased().contains(query)
-        }
-    }
-
     /// Production init — loads currencies from CurrencyExchangerObjcWrapper.
     init(currencyCode: String? = nil) {
         let formatter = NumberFormatter()
@@ -62,18 +43,43 @@ class LocalCurrencyViewModel: ObservableObject {
         }
         self.allItems = items
         self.selectedCurrencyCode = currencyCode ?? App.fiatCurrency
+        self.filteredItems = items
+        setupSearch()
     }
 
     /// Preview / testing init — accepts pre-built items without DashSync.
     init(items: [CurrencyItem], selectedCode: String) {
         self.allItems = items
         self.selectedCurrencyCode = selectedCode
+        self.filteredItems = items
+        setupSearch()
     }
 
     func select(currencyCode: String) {
         selectedCurrencyCode = currencyCode
         App.shared.fiatCurrency = currencyCode
     }
+
+    private func setupSearch() {
+        $searchQuery
+            .debounce(for: .milliseconds(150), scheduler: RunLoop.main)
+            .sink { [weak self] query in
+                self?.applyFilter(query)
+            }
+            .store(in: &cancellables)
+    }
+
+    private func applyFilter(_ query: String) {
+        let trimmed = query.trimmingCharacters(in: .whitespaces)
+        guard !trimmed.isEmpty else {
+            filteredItems = allItems
+            return
+        }
+        let lowercased = trimmed.lowercased()
+        filteredItems = allItems.filter {
+            $0.code.lowercased().contains(lowercased) || $0.name.lowercased().contains(lowercased)
+        }
+    }
 }
 
 // MARK: - Flag mapping