feat: add auth screens and state management

lib/app.dart

@@ -0,0 +1,28 @@
+import 'package:flutter/material.dart';
+import 'package:go_router/go_router.dart';
+import 'package:phone_login/auth/auth_state.dart';
+import 'package:phone_login/auth/phone_input_screen.dart';
+import 'package:phone_login/auth/sms_verification_screen.dart';
+import 'package:provider/provider.dart';
+
+final _router = GoRouter(
+  routes: [
+    GoRoute(path: '/', builder: (context, state) => const PhoneInputScreen()),
+    GoRoute(
+      path: '/sms_verify',
+      builder: (context, state) => const SmsVerificationScreen(),
+    ),
+  ],
+);
+
+class App extends StatelessWidget {
+  const App({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return ChangeNotifierProvider(
+      create: (_) => AuthState(),
+      child: MaterialApp.router(routerConfig: _router),
+    );
+  }
+}

lib/auth/auth_state.dart

@@ -0,0 +1,18 @@
+import 'package:flutter/material.dart';
+import 'package:firebase_auth/firebase_auth.dart';
+
+class AuthState extends ChangeNotifier {
+  User? _user;
+  User? get user => _user;
+
+  final FirebaseAuth _auth = FirebaseAuth.instance;
+
+  AuthState() {
+    _auth.authStateChanges().listen((user) {
+      _user = user;
+      notifyListeners();
+    });
+  }
+
+  bool get isLoggedIn => _user != null;
+}

lib/auth/phone_input_screen.dart

@@ -0,0 +1,33 @@
+import 'package:flutter/material.dart';
+import 'package:intl_phone_field/intl_phone_field.dart';
+
+class PhoneInputScreen extends StatelessWidget {
+  const PhoneInputScreen({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: const Text('Enter Phone Number')),
+      body: Padding(
+        padding: const EdgeInsets.all(16.0),
+        child: Column(
+          crossAxisAlignment: CrossAxisAlignment.stretch,
+          children: [
+            IntlPhoneField(
+              decoration: const InputDecoration(
+                labelText: 'Phone Number',
+                border: OutlineInputBorder(borderSide: BorderSide()),
+              ),
+              initialCountryCode: 'US',
+              onChanged: (phone) {
+                // TODO: Handle phone number changes
+              },
+            ),
+            const SizedBox(height: 20),
+            ElevatedButton(onPressed: () {}, child: const Text('Send OTP')),
+          ],
+        ),
+      ),
+    );
+  }
+}

lib/auth/sms_verification_screen.dart

@@ -0,0 +1,35 @@
+import 'package:flutter/material.dart';
+import 'package:pinput/pinput.dart';
+
+class SmsVerificationScreen extends StatelessWidget {
+  const SmsVerificationScreen({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: const Text('SMS Verification')),
+      body: Padding(
+        padding: const EdgeInsets.all(16.0),
+        child: Column(
+          crossAxisAlignment: CrossAxisAlignment.stretch,
+          children: [
+            const Text(
+              'Enter the 6-digit code sent to you',
+              textAlign: TextAlign.center,
+              style: TextStyle(fontSize: 16),
+            ),
+            const SizedBox(height: 20),
+            Pinput(
+              length: 6,
+              onCompleted: (pin) {
+                // TODO: Handle OTP completion
+              },
+            ),
+            const SizedBox(height: 20),
+            ElevatedButton(onPressed: () {}, child: const Text('Verify')),
+          ],
+        ),
+      ),
+    );
+  }
+}

lib/main.dart

@@ -0,0 +1,9 @@
+import 'package:firebase_core/firebase_core.dart';
+import 'package:flutter/material.dart';
+import 'package:phone_login/app.dart';
+
+void main() async {
+  WidgetsFlutterBinding.ensureInitialized();
+  await Firebase.initializeApp();
+  runApp(const App());
+}

macos/Flutter/GeneratedPluginRegistrant.swift

@@ -5,6 +5,10 @@
 import FlutterMacOS
 import Foundation
 
+import firebase_auth
+import firebase_core
 
 func RegisterGeneratedPlugins(registry: FlutterPluginRegistry) {
+  FLTFirebaseAuthPlugin.register(with: registry.registrar(forPlugin: "FLTFirebaseAuthPlugin"))
+  FLTFirebaseCorePlugin.register(with: registry.registrar(forPlugin: "FLTFirebaseCorePlugin"))
 }

pubspec.lock

@@ -1,6 +1,14 @@
 # Generated by pub
 # See https://dart.dev/tools/pub/glossary#lockfile
 packages:
+  _flutterfire_internals:
+    dependency: transitive
+    description:
+      name: _flutterfire_internals
+      sha256: e4a1b612fd2955908e26116075b3a4baf10c353418ca645b4deae231c82bf144
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.3.65"
   async:
     dependency: transitive
     description:
@@ -49,6 +57,54 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.3.3"
+  firebase_auth:
+    dependency: "direct main"
+    description:
+      name: firebase_auth
+      sha256: "060a9bfc9877538dfdc69f2fdc1e0bf068439a7e9f22da6513f7b9bde308bb93"
+      url: "https://pub.dev"
+    source: hosted
+    version: "6.1.3"
+  firebase_auth_platform_interface:
+    dependency: transitive
+    description:
+      name: firebase_auth_platform_interface
+      sha256: e91c9aadf9944e8319855fa752fd6c664bade2bbd6e7697a5142113c319a4288
+      url: "https://pub.dev"
+    source: hosted
+    version: "8.1.5"
+  firebase_auth_web:
+    dependency: transitive
+    description:
+      name: firebase_auth_web
+      sha256: "155145fd84f311e50eb2bfeb892f74b0d1b30936f40765a051b70110270cb6d1"
+      url: "https://pub.dev"
+    source: hosted
+    version: "6.1.1"
+  firebase_core:
+    dependency: "direct main"
+    description:
+      name: firebase_core
+      sha256: "29cfa93c771d8105484acac340b5ea0835be371672c91405a300303986f4eba9"
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.3.0"
+  firebase_core_platform_interface:
+    dependency: transitive
+    description:
+      name: firebase_core_platform_interface
+      sha256: cccb4f572325dc14904c02fcc7db6323ad62ba02536833dddb5c02cac7341c64
+      url: "https://pub.dev"
+    source: hosted
+    version: "6.0.2"
+  firebase_core_web:
+    dependency: transitive
+    description:
+      name: firebase_core_web
+      sha256: a631bbfbfa26963d68046aed949df80b228964020e9155b086eff94f462bbf1f
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.3.1"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -67,6 +123,43 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  flutter_web_plugins:
+    dependency: transitive
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  go_router:
+    dependency: "direct main"
+    description:
+      name: go_router
+      sha256: eff94d2a6fc79fa8b811dde79c7549808c2346037ee107a1121b4a644c745f2a
+      url: "https://pub.dev"
+    source: hosted
+    version: "17.0.1"
+  http:
+    dependency: transitive
+    description:
+      name: http
+      sha256: "87721a4a50b19c7f1d49001e51409bddc46303966ce89a65af4f4e6004896412"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.6.0"
+  http_parser:
+    dependency: transitive
+    description:
+      name: http_parser
+      sha256: "178d74305e7866013777bab2c3d8726205dc5a4dd935297175b19a23a2e66571"
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.1.2"
+  intl_phone_field:
+    dependency: "direct main"
+    description:
+      name: intl_phone_field
+      sha256: "73819d3dfcb68d2c85663606f6842597c3ddf6688ac777f051b17814fe767bbf"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.2.0"
   leak_tracker:
     dependency: transitive
     description:
@@ -99,6 +192,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "6.0.0"
+  logging:
+    dependency: transitive
+    description:
+      name: logging
+      sha256: c8245ada5f1717ed44271ed1c26b8ce85ca3228fd2ffdb75468ab01979309d61
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.3.0"
   matcher:
     dependency: transitive
     description:
@@ -123,6 +224,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.17.0"
+  nested:
+    dependency: transitive
+    description:
+      name: nested
+      sha256: "03bac4c528c64c95c722ec99280375a6f2fc708eec17c7b3f07253b626cd2a20"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.0"
   path:
     dependency: transitive
     description:
@@ -131,6 +240,30 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.9.1"
+  pinput:
+    dependency: "direct main"
+    description:
+      name: pinput
+      sha256: "692e1c29703abefad6c502e97b4d946d506384397438ea242afadbfe48354819"
+      url: "https://pub.dev"
+    source: hosted
+    version: "6.0.1"
+  plugin_platform_interface:
+    dependency: transitive
+    description:
+      name: plugin_platform_interface
+      sha256: "4820fbfdb9478b1ebae27888254d445073732dae3d6ea81f0b7e06d5dedc3f02"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.8"
+  provider:
+    dependency: "direct main"
+    description:
+      name: provider
+      sha256: "4e82183fa20e5ca25703ead7e05de9e4cceed1fbd1eadc1ac3cb6f565a09f272"
+      url: "https://pub.dev"
+    source: hosted
+    version: "6.1.5+1"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -184,6 +317,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.7.7"
+  typed_data:
+    dependency: transitive
+    description:
+      name: typed_data
+      sha256: f9049c039ebfeb4cf7a7104a675823cd72dba8297f264b6637062516699fa006
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.4.0"
   vector_math:
     dependency: transitive
     description:
@@ -200,6 +341,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "15.0.2"
+  web:
+    dependency: transitive
+    description:
+      name: web
+      sha256: "868d88a33d8a87b18ffc05f9f030ba328ffefba92d6c127917a2ba740f9cfe4a"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.1"
 sdks:
   dart: ">=3.10.4 <4.0.0"
-  flutter: ">=3.18.0-18.0.pre.54"
+  flutter: ">=3.35.0"

pubspec.yaml

@@ -9,6 +9,12 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
+  firebase_core: ^4.3.0
+  firebase_auth: ^6.1.3
+  go_router: ^17.0.1
+  provider: ^6.1.5+1
+  intl_phone_field: ^3.2.0
+  pinput: ^6.0.1
 
 dev_dependencies:
   flutter_test:

windows/flutter/generated_plugin_registrant.cc

@@ -6,6 +6,12 @@
 
 #include "generated_plugin_registrant.h"
 
+#include <firebase_auth/firebase_auth_plugin_c_api.h>
+#include <firebase_core/firebase_core_plugin_c_api.h>
 
 void RegisterPlugins(flutter::PluginRegistry* registry) {
+  FirebaseAuthPluginCApiRegisterWithRegistrar(
+      registry->GetRegistrarForPlugin("FirebaseAuthPluginCApi"));
+  FirebaseCorePluginCApiRegisterWithRegistrar(
+      registry->GetRegistrarForPlugin("FirebaseCorePluginCApi"));
 }

windows/flutter/generated_plugins.cmake

@@ -3,6 +3,8 @@
 #
 
 list(APPEND FLUTTER_PLUGIN_LIST
+  firebase_auth
+  firebase_core
 )
 
 list(APPEND FLUTTER_FFI_PLUGIN_LIST