Update version

PortfolioJournal/Views/Accounts/AccountEditorView.swift

@@ -10,6 +10,7 @@ struct AccountEditorView: View {
     @State private var inputMode: InputMode = .simple
     @State private var notificationFrequency: NotificationFrequency = .monthly
     @State private var customFrequencyMonths = 1
+    @State private var errorMessage: String?
 
     private let accountRepository = AccountRepository()
 
@@ -25,6 +26,11 @@ struct AccountEditorView: View {
                     }
                 } header: {
                     Text("Account")
+                } footer: {
+                    if let errorMessage {
+                        Text(errorMessage)
+                            .foregroundColor(.negativeRed)
+                    }
                 }
 
                 Section {
@@ -39,25 +45,6 @@ struct AccountEditorView: View {
                     Text(inputMode.description)
                 }
 
-                Section {
-                    Picker("Reminder Frequency", selection: $notificationFrequency) {
-                        ForEach(NotificationFrequency.allCases) { frequency in
-                            Text(frequency.displayName).tag(frequency)
-                        }
-                    }
-
-                    if notificationFrequency == .custom {
-                        Stepper(
-                            "Every \(customFrequencyMonths) month\(customFrequencyMonths > 1 ? "s" : "")",
-                            value: $customFrequencyMonths,
-                            in: 1...24
-                        )
-                    }
-                } header: {
-                    Text("Account Reminders")
-                } footer: {
-                    Text("Reminders apply to the whole account.")
-                }
             }
             .navigationTitle(account == nil ? "New Account" : "Edit Account")
             .navigationBarTitleDisplayMode(.inline)
@@ -73,12 +60,35 @@ struct AccountEditorView: View {
             .onAppear {
                 loadAccount()
             }
+            .onChange(of: name) { _, _ in
+                validateName()
+            }
         }
         .presentationDetents([.large])
     }
 
     private var isValid: Bool {
-        !name.trimmingCharacters(in: .whitespaces).isEmpty
+        let trimmed = name.trimmingCharacters(in: .whitespaces)
+        return !trimmed.isEmpty && !isDuplicateName(trimmed)
+    }
+
+    private func validateName() {
+        let trimmed = name.trimmingCharacters(in: .whitespaces)
+        if trimmed.isEmpty {
+            errorMessage = nil
+            return
+        }
+        errorMessage = isDuplicateName(trimmed) ? "An account with this name already exists." : nil
+    }
+
+    private func isDuplicateName(_ trimmed: String) -> Bool {
+        let normalized = trimmed.lowercased()
+        return accountRepository.accounts.contains { existing in
+            if let account, existing.id == account.id {
+                return false
+            }
+            return (existing.name).trimmingCharacters(in: .whitespaces).lowercased() == normalized
+        }
     }
 
     private func loadAccount() {
@@ -86,27 +96,33 @@ struct AccountEditorView: View {
         name = account.name
         currencyCode = account.currencyCode ?? currencyCode
         inputMode = InputMode(rawValue: account.inputMode) ?? .simple
-        notificationFrequency = account.frequency
-        customFrequencyMonths = Int(account.customFrequencyMonths)
+        notificationFrequency = .monthly
+        customFrequencyMonths = 1
+        validateName()
     }
 
     private func saveAccount() {
+        validateName()
+        guard errorMessage == nil else { return }
+        let trimmedName = name.trimmingCharacters(in: .whitespaces)
+        let enforcedFrequency: NotificationFrequency = .monthly
+        let enforcedCustomMonths = 1
         if let account {
             accountRepository.updateAccount(
                 account,
-                name: name.trimmingCharacters(in: .whitespaces),
+                name: trimmedName,
                 currency: currencyCode,
                 inputMode: inputMode,
-                notificationFrequency: notificationFrequency,
-                customFrequencyMonths: customFrequencyMonths
+                notificationFrequency: enforcedFrequency,
+                customFrequencyMonths: enforcedCustomMonths
             )
         } else {
             _ = accountRepository.createAccount(
-                name: name.trimmingCharacters(in: .whitespaces),
+                name: trimmedName,
                 currency: currencyCode,
                 inputMode: inputMode,
-                notificationFrequency: notificationFrequency,
-                customFrequencyMonths: customFrequencyMonths
+                notificationFrequency: enforcedFrequency,
+                customFrequencyMonths: enforcedCustomMonths
             )
         }