import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:gap/gap.dart';
import 'package:go_router/go_router.dart';
import 'package:supabase_flutter/supabase_flutter.dart';
import 'package:tp5/core/core.dart';

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

  @override
  ConsumerState<LoginOtp> createState() => _LoginOtpState();
}

class _LoginOtpState extends ConsumerState<LoginOtp> {
  final TextEditingController _emailController = TextEditingController();
  final TextEditingController _otpController = TextEditingController();
  bool _isOtpSent = false;
  bool _isLoading = false;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Sign In'),
        backgroundColor: Colors.blueAccent,
      ),
      body: SingleChildScrollView(
        child: Padding(
          padding: const EdgeInsets.all(16.0),
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            crossAxisAlignment: CrossAxisAlignment.stretch,
            children: [
              SizedBox(height: 50),
              Image(
                image: AssetImage('assets/logo.png'),
                width: 100,
                height: 100,
              ),
              Gap(20),
              Text(
                'Welcome to TAR Pilot v5',
                style: TextStyle(
                  fontSize: 24,
                  fontWeight: FontWeight.bold,
                  color: Colors.blueAccent,
                ),
                textAlign: TextAlign.center,
              ),
              SizedBox(height: 20),
              Text(
                'Please enter your email to sign in.',
                style: TextStyle(
                  fontSize: 16,
                  color: Colors.grey[700],
                ),
                textAlign: TextAlign.center,
              ),
              SizedBox(height: 40),
              TextField(
                controller: _emailController,
                decoration: InputDecoration(
                  labelText: 'Email',
                  hintText: 'Enter your email',
                  border: OutlineInputBorder(
                    borderRadius: BorderRadius.circular(10),
                  ),
                  prefixIcon: Icon(Icons.email),
                ),
                keyboardType: TextInputType.emailAddress,
              ),
              SizedBox(height: 20),
              if (_isOtpSent) ...[
                TextField(
                  controller: _otpController,
                  decoration: InputDecoration(
                    labelText: 'OTP',
                    hintText: 'Enter OTP sent to your email',
                    border: OutlineInputBorder(
                      borderRadius: BorderRadius.circular(10),
                    ),
                    prefixIcon: Icon(Icons.lock_outline),
                  ),
                  keyboardType: TextInputType.number,
                ),
                SizedBox(height: 20),
              ],
              ElevatedButton(
                onPressed: _isLoading
                    ? null
                    : () async {
                        final email = _emailController.text;
                        setState(() => _isLoading = true);
                        try {
                          if (!_isOtpSent) {
                            await Supabase.instance.client.auth.signInWithOtp(
                                email: email,
                                shouldCreateUser: false,
                                emailRedirectTo:
                                    'com.example.tp5://magic-link');
                            setState(() => _isOtpSent = true);
                          } else {
                            final response =
                                await Supabase.instance.client.auth.verifyOTP(
                              email: email,
                              token: _otpController.text,
                              type: OtpType.email,
                            );

                            if (response.session == null) {
                              _otpController.clear();
                              ScaffoldMessenger.of(context).showSnackBar(
                                const SnackBar(
                                  content:
                                      Text('Invalid OTP. Please try again.'),
                                  backgroundColor: Colors.red,
                                ),
                              );
                            } else {
                              //logged in
                              print(response.session?.accessToken);
                              context.go("/home");
                            }
                          }
                        } catch (e) {
                          if (e is AuthApiException && !_isOtpSent) {
                            //signup
                            print("loginotp: new signup");
                            setState(() => _isLoading = true);

                            await Supabase.instance.client.auth.signInWithOtp(
                                email: email,
                                shouldCreateUser: true,
                                emailRedirectTo:
                                    'com.example.tp5://auth/magic-link');
                            setState(() => _isOtpSent = true);
//go profile after new registration
                            context.go('/home');
                          } else {
                            //error
                            _otpController.clear();
                            context.showError('Error: ${e.toString()}');
                          }
                        } finally {
                          if (mounted) {
                            setState(() => _isLoading = false);
                          }
                        }
                      },
                style: ElevatedButton.styleFrom(
                  padding: EdgeInsets.symmetric(vertical: 15),
                  backgroundColor: Colors.blueAccent,
                  shape: RoundedRectangleBorder(
                    borderRadius: BorderRadius.circular(10),
                  ),
                ),
                child: _isLoading
                    ? const SizedBox(
                        height: 20,
                        width: 20,
                        child: CircularProgressIndicator(
                          color: Colors.white,
                          strokeWidth: 2,
                        ),
                      )
                    : Text(
                        _isOtpSent ? 'Verify OTP' : 'Send OTP',
                        style: TextStyle(fontSize: 18),
                      ),
              ),
              SizedBox(height: 20),
              if (_isOtpSent)
                TextButton(
                  onPressed: () {
                    // Handle use another email
                    _emailController.clear();
                    setState(() => _isOtpSent = false);
                  },
                  child: Text(
                    'Use another mail?',
                    style: TextStyle(
                      color: Colors.blueAccent,
                      fontSize: 16,
                    ),
                  ),
                ),
            ],
          ),
        ),
      ),
    );
  }

  @override
  void dispose() {
    _emailController.dispose();
    _otpController.dispose();
    super.dispose();
  }
}