Add public-samples/founditure-furniture-marketplace-9f3hat/src/ios/Fo…

…unditure/UI/Screens/Auth/RegisterViewModel.swift

src/ios/Founditure/UI/Screens/Auth/RegisterViewModel.swift

@@ -0,0 +1,154 @@
+// Foundation framework - Latest
+import Foundation
+// Combine framework - Latest
+import Combine
+// SwiftUI framework - Latest
+import SwiftUI
+
+/// Human Tasks:
+/// 1. Configure proper error logging for registration failures
+/// 2. Review password strength requirements with security team
+/// 3. Verify email validation regex pattern meets security standards
+/// 4. Set up analytics tracking for registration events
+/// 5. Configure proper rate limiting handling
+
+/// RegistrationError: Defines possible validation errors during registration
+/// Requirements addressed:
+/// - Authentication Methods (5.1.1): Comprehensive form validation
+public enum RegistrationError: Error {
+    case invalidEmail
+    case invalidPassword
+    case passwordMismatch
+    case weakPassword
+    case emailTaken
+}
+
+/// RegisterViewModel: Manages registration form state and validation
+/// Requirements addressed:
+/// - Authentication Methods (5.1.1): Email/password registration with validation
+/// - Data Security (5.2.1): Secure handling of registration data
+@MainActor
+@Observable
+public final class RegisterViewModel {
+    // MARK: - Private Properties
+
+    private let authService: AuthService
+    private let emailRegex = "^[\\w-\\.]+@([\\w-]+\\.)+[\\w-]{2,4}$"
+    private let minimumPasswordLength = AppConstants.Security.minimumPasswordLength
+
+    // MARK: - Public Properties
+
+    public var email: String = ""
+    public var password: String = ""
+    public var confirmPassword: String = ""
+    public var displayName: String = ""
+    public var isLoading: Bool = false
+    public var error: Error?
+    public private(set) var validationErrors: Set<RegistrationError> = []
+
+    // MARK: - Initialization
+
+    /// Initializes view model with auth service dependency
+    /// - Parameter authService: Service handling authentication operations
+    public init(authService: AuthService) {
+        self.authService = authService
+    }
+
+    // MARK: - Public Methods
+
+    /// Validates registration form input
+    /// Requirements addressed:
+    /// - Authentication Methods (5.1.1): Comprehensive form validation
+    public func validateForm() -> Bool {
+        validationErrors.removeAll()
+
+        // Validate email format
+        if !NSPredicate(format: "SELF MATCHES %@", emailRegex)
+            .evaluate(with: email.trimmingCharacters(in: .whitespaces)) {
+            validationErrors.insert(.invalidEmail)
+        }
+
+        // Validate password strength
+        if password.count < minimumPasswordLength {
+            validationErrors.insert(.weakPassword)
+        }
+
+        // Check for password complexity
+        let hasUppercase = password.contains(where: { $0.isUppercase })
+        let hasLowercase = password.contains(where: { $0.isLowercase })
+        let hasNumber = password.contains(where: { $0.isNumber })
+        let hasSpecialCharacter = password.contains(where: { "!@#$%^&*()_+-=[]{}|;:,.<>?".contains($0) })
+
+        if !hasUppercase || !hasLowercase || !hasNumber || !hasSpecialCharacter {
+            validationErrors.insert(.weakPassword)
+        }
+
+        // Validate password confirmation
+        if password != confirmPassword {
+            validationErrors.insert(.passwordMismatch)
+        }
+
+        // Validate display name
+        if displayName.trimmingCharacters(in: .whitespaces).count < 3 {
+            validationErrors.insert(.invalidPassword)
+        }
+
+        return validationErrors.isEmpty
+    }
+
+    /// Attempts to register new user
+    /// Requirements addressed:
+    /// - Authentication Methods (5.1.1): Secure user registration
+    /// - Data Security (5.2.1): Secure credential handling
+    public func register() async throws {
+        isLoading = true
+        error = nil
+
+        do {
+            // Validate form input
+            guard validateForm() else {
+                throw validationErrors.first ?? RegistrationError.invalidPassword
+            }
+
+            // Create user profile
+            let profile = UserProfile(
+                displayName: displayName.trimmingCharacters(in: .whitespaces)
+            )
+
+            // Attempt registration
+            try await authService.register(
+                email: email.trimmingCharacters(in: .whitespaces),
+                password: password,
+                profile: profile
+            )
+
+            // Clear form on success
+            clearForm()
+        } catch let authError as AuthError {
+            switch authError {
+            case .registrationError:
+                error = RegistrationError.emailTaken
+            default:
+                error = authError
+            }
+            throw error!
+        } catch {
+            self.error = error
+            throw error
+        } finally {
+            isLoading = false
+        }
+    }
+
+    /// Securely clears form data
+    /// Requirements addressed:
+    /// - Data Security (5.2.1): Secure data handling
+    public func clearForm() {
+        email = ""
+        password = ""
+        confirmPassword = ""
+        displayName = ""
+        validationErrors.removeAll()
+        error = nil
+    }
+}