import 'package:flutter/material.dart';
import 'package:lucide_icons/lucide_icons.dart';

import 'package:flutter_riverpod/flutter_riverpod.dart';
import '../providers/auth_provider.dart';
import 'otp_screen.dart';
import 'forgot_password_screen.dart';
import '../../dashboard/presentation/dashboard_screen.dart';
import '../../../../core/network/dio_client.dart';
import 'setup_wizard_screen.dart';

class AuthScreen extends ConsumerStatefulWidget {
  const AuthScreen({super.key});

  @override
  ConsumerState<AuthScreen> createState() => _AuthScreenState();
}

class _AuthScreenState extends ConsumerState<AuthScreen> with SingleTickerProviderStateMixin {
  bool isLogin = true;
  final emailController = TextEditingController(text: 'maddy23285@gmail.com');
  final passwordController = TextEditingController(text: 'Algorithm@123');

  void toggleMode(bool login) {
    if (isLogin == login) return;
    setState(() {
      isLogin = login;
    });
  }

  Future<void> submit() async {
    final email = emailController.text.trim();
    final password = passwordController.text;

    if (email.isEmpty || password.isEmpty) return;

    if (isLogin) {
      final success = await ref.read(authControllerProvider.notifier).login(email, password);
      if (success && mounted) {
        try {
          final dio = DioClient().dio;
          final res = await dio.get('/account/setup/status');
          final status = res.data['status'];
          if (status == 'COMPLETED' && mounted) {
            Navigator.pushReplacement(context, MaterialPageRoute(builder: (_) => const DashboardScreen()));
          } else if (mounted) {
            Navigator.pushReplacement(context, MaterialPageRoute(builder: (_) => const SetupWizardScreen()));
          }
        } catch(e) {
          if (mounted) Navigator.pushReplacement(context, MaterialPageRoute(builder: (_) => const SetupWizardScreen()));
        }
      }
    } else {
      final success = await ref.read(authControllerProvider.notifier).signup(email, password);
      if (success && mounted) {
        Navigator.push(context, MaterialPageRoute(builder: (_) => OtpScreen(email: email)));
      }
    }
  }

  InputDecoration _buildInputDecoration(String label, IconData icon) {
    return InputDecoration(
      labelText: label,
      prefixIcon: Icon(icon, color: Colors.grey.shade500),
      filled: true,
      fillColor: Colors.white,
      border: OutlineInputBorder(
        borderRadius: BorderRadius.circular(12),
        borderSide: BorderSide(color: Colors.grey.shade300),
      ),
      enabledBorder: OutlineInputBorder(
        borderRadius: BorderRadius.circular(12),
        borderSide: BorderSide(color: Colors.grey.shade300),
      ),
      focusedBorder: OutlineInputBorder(
        borderRadius: BorderRadius.circular(12),
        borderSide: BorderSide(color: Theme.of(context).primaryColor, width: 2),
      ),
      contentPadding: const EdgeInsets.symmetric(horizontal: 16, vertical: 18),
    );
  }

  @override
  Widget build(BuildContext context) {
    ref.listen<AsyncValue<void>>(authControllerProvider, (previous, next) {
      if (next.hasError) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text('${next.error}')),
        );
      }
    });

    final state = ref.watch(authControllerProvider);
    final isLoading = state.isLoading;

    return Scaffold(
      backgroundColor: Colors.grey.shade50,
      body: SafeArea(
        child: Center(
          child: SingleChildScrollView(
            padding: const EdgeInsets.all(24.0),
            child: ConstrainedBox(
              constraints: const BoxConstraints(maxWidth: 400),
              child: Column(
                mainAxisAlignment: MainAxisAlignment.center,
                crossAxisAlignment: CrossAxisAlignment.stretch,
                children: [
                  Container(
                    width: 80, height: 80,
                    decoration: BoxDecoration(
                      color: Theme.of(context).primaryColor.withOpacity(0.1),
                      shape: BoxShape.circle,
                    ),
                    child: Center(child: Image.asset('assets/logo.png', width: 50, height: 50, fit: BoxFit.contain)),
                  ),
                  const SizedBox(height: 32),
                  Text(
                    'Welcome to Kifi',
                    style: Theme.of(context).textTheme.headlineMedium?.copyWith(fontWeight: FontWeight.bold, color: Colors.black87),
                    textAlign: TextAlign.center,
                  ),
                  const SizedBox(height: 8),
                  Text(
                    'Manage your inventory and expenses securely.',
                    style: Theme.of(context).textTheme.bodyMedium?.copyWith(color: Colors.grey.shade600),
                    textAlign: TextAlign.center,
                  ),
                  const SizedBox(height: 32),
                  Container(
                    padding: const EdgeInsets.all(4),
                    decoration: BoxDecoration(
                      color: Colors.grey.shade200,
                      borderRadius: BorderRadius.circular(16),
                    ),
                    child: Row(
                      children: [
                        Expanded(
                          child: InkWell(
                            onTap: () => toggleMode(true),
                            borderRadius: BorderRadius.circular(12),
                            child: AnimatedContainer(
                              duration: const Duration(milliseconds: 200),
                              padding: const EdgeInsets.symmetric(vertical: 12),
                              decoration: BoxDecoration(
                                color: isLogin ? Colors.white : Colors.transparent,
                                borderRadius: BorderRadius.circular(12),
                                boxShadow: isLogin ? [BoxShadow(color: Colors.black.withOpacity(0.05), blurRadius: 4, offset: const Offset(0, 2))] : [],
                              ),
                              child: Center(child: Text('Login', style: TextStyle(fontWeight: FontWeight.w600, color: isLogin ? Colors.black87 : Colors.grey.shade600))),
                            ),
                          ),
                        ),
                        Expanded(
                          child: InkWell(
                            onTap: () => toggleMode(false),
                            borderRadius: BorderRadius.circular(12),
                            child: AnimatedContainer(
                              duration: const Duration(milliseconds: 200),
                              padding: const EdgeInsets.symmetric(vertical: 12),
                              decoration: BoxDecoration(
                                color: !isLogin ? Colors.white : Colors.transparent,
                                borderRadius: BorderRadius.circular(12),
                                boxShadow: !isLogin ? [BoxShadow(color: Colors.black.withOpacity(0.05), blurRadius: 4, offset: const Offset(0, 2))] : [],
                              ),
                              child: Center(child: Text('Sign Up', style: TextStyle(fontWeight: FontWeight.w600, color: !isLogin ? Colors.black87 : Colors.grey.shade600))),
                            ),
                          ),
                        ),
                      ],
                    ),
                  ),
                  const SizedBox(height: 32),
                  AnimatedSize(
                    duration: const Duration(milliseconds: 300),
                    curve: Curves.easeInOut,
                    alignment: Alignment.topCenter,
                    child: Column(
                      crossAxisAlignment: CrossAxisAlignment.stretch,
                      children: [
                        TextField(
                          controller: emailController,
                          keyboardType: TextInputType.emailAddress,
                          style: const TextStyle(fontWeight: FontWeight.w500),
                          textInputAction: TextInputAction.next,
                          decoration: _buildInputDecoration(isLogin ? 'Email or Username' : 'Email Address', LucideIcons.mail),
                        ),
                        const SizedBox(height: 16),
                        TextField(
                          controller: passwordController,
                          obscureText: true,
                          style: const TextStyle(fontWeight: FontWeight.w500),
                          textInputAction: TextInputAction.done,
                          onSubmitted: (_) => submit(),
                          decoration: _buildInputDecoration('Password', LucideIcons.lock),
                        ),
                        AnimatedSwitcher(
                          duration: const Duration(milliseconds: 200),
                          child: isLogin
                              ? Align(
                                  alignment: Alignment.centerRight,
                                  child: Padding(
                                    padding: const EdgeInsets.only(top: 12),
                                    child: TextButton(
                                      onPressed: () => Navigator.push(context, MaterialPageRoute(builder: (_) => const ForgotPasswordScreen())),
                                      style: TextButton.styleFrom(
                                        foregroundColor: Theme.of(context).primaryColor,
                                        padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 4),
                                        minimumSize: Size.zero,
                                        tapTargetSize: MaterialTapTargetSize.shrinkWrap,
                                      ),
                                      child: const Text('Forgot Password?', style: TextStyle(fontWeight: FontWeight.w600, fontSize: 13)),
                                    ),
                                  ),
                                )
                              : const SizedBox(height: 12),
                        ),
                      ],
                    ),
                  ),
                  const SizedBox(height: 32),
                  SizedBox(
                    width: double.infinity,
                    child: ElevatedButton(
                      onPressed: isLoading ? null : submit,
                      style: ElevatedButton.styleFrom(
                        backgroundColor: Theme.of(context).primaryColor,
                        foregroundColor: Colors.white,
                        padding: const EdgeInsets.symmetric(vertical: 20),
                        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)),
                        elevation: 2,
                      ),
                      child: isLoading
                          ? const SizedBox(height: 24, width: 24, child: CircularProgressIndicator(color: Colors.white, strokeWidth: 2))
                          : Text(isLogin ? 'Log In' : 'Create Account', style: const TextStyle(fontSize: 18, fontWeight: FontWeight.bold, letterSpacing: 0.5)),
                    ),
                  ),
                ],
              ),
            ),
          ),
        ),
      ),
    );
  }
}