chore: move auth flow to authEnvironment + init email provider

Author: russellwheatley

FirebaseSwiftUI/FirebaseAuthSwiftUI/Sources/FirebaseAuthSwiftUI/Services/AuthEnvironment.swift

@@ -18,12 +18,18 @@ public enum AuthenticationState {
   case authenticated
 }
 
+public enum AuthenticationFlow {
+  case login
+  case signUp
+}
+
 @MainActor
 @Observable
 public final class AuthEnvironment {
   public static let shared = AuthEnvironment()
 
   var currentUser: User?
+  var errorMessage = ""
 
   private init() {
     setupAuthenticationListener()
@@ -37,6 +43,7 @@ public final class AuthEnvironment {
   }
 
   public var authenticationState: AuthenticationState = .unauthenticated
+  public var authenticationFlow: AuthenticationFlow = .login
 
   private func setupAuthenticationListener() {
     authStateHandle = Auth.auth().addStateDidChangeListener { [weak self] _, user in

FirebaseSwiftUI/FirebaseAuthSwiftUI/Sources/FirebaseAuthSwiftUI/Services/EmailProvider.swift

@@ -2,7 +2,7 @@
 import SwiftUI
 
 @MainActor
-class EmailAuthProvider {
+public class EmailAuthProvider {
   @Environment(AuthEnvironment.self) private var authEnvironment
 
   public init() {}

FirebaseSwiftUI/FirebaseAuthSwiftUI/Sources/FirebaseAuthSwiftUI/Views/AuthenticationScreen.swift

@@ -1,28 +1,25 @@
 import FirebaseAuth
 import SwiftUI
 
-enum AuthenticationFlow {
-  case login
-  case signUp
-}
-
+@MainActor
 public struct AuthenticationScreen {
   @Environment(AuthEnvironment.self) private var authEnvironment
-  @State private var flow: AuthenticationFlow = .login
   @State private var errorMessage = ""
 
   public init() {}
 
   private func switchFlow() {
-    flow = flow == .login ? .signUp : .login
+    authEnvironment.authenticationFlow = authEnvironment
+      .authenticationFlow == .login ? .signUp : .login
     errorMessage = ""
   }
 }
 
 extension AuthenticationScreen: View {
   public var body: some View {
     VStack {
-      Text("Authentication screen")
+      Text(authEnvironment.authenticationFlow == .login ? "Login" : "Sign up")
+      EmailPasswordView(provider: EmailAuthProvider()).environment(authEnvironment)
     }
   }
 }

FirebaseSwiftUI/FirebaseAuthSwiftUI/Sources/FirebaseAuthSwiftUI/Views/EmailPasswordView.swift

@@ -4,5 +4,60 @@
 //
 //  Created by Russell Wheatley on 20/03/2025.
 //
+import SwiftUI
 
-import Foundation
+private enum FocusableField: Hashable {
+  case email
+  case password
+  case confirmPassword
+}
+
+@MainActor
+public struct EmailPasswordView {
+  @Environment(AuthEnvironment.self) private var authEnvironment
+  @Environment(\.dismiss) private var dismiss
+
+  @State private var provider: EmailAuthProvider
+
+  @State private var email = ""
+  @State private var password = ""
+  @State private var confirmPassword = ""
+
+  @FocusState private var focus: FocusableField?
+
+  public init(provider: EmailAuthProvider) {
+    self.provider = provider
+  }
+
+  private var isValid: Bool {
+    return if authEnvironment.authenticationFlow == .login {
+      !email.isEmpty && !password.isEmpty
+    } else {
+      !email.isEmpty && !password.isEmpty && password == confirmPassword
+    }
+  }
+
+  private func signInWithEmailPassword() async {
+    do {
+      try await provider.signIn(withEmail: email, password: password)
+      dismiss()
+    } catch {
+      authEnvironment.errorMessage = error.localizedDescription
+    }
+  }
+
+  private func signUpWithEmailPassword() async {
+    do {
+      try await provider.signUp(withEmail: email, password: password)
+      dismiss()
+    } catch {
+      authEnvironment.errorMessage = error.localizedDescription
+    }
+  }
+}
+
+extension EmailPasswordView: View {
+  public var body: some View {
+    Text("EmailPasswordView")
+  }
+}