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

import '../../consts/colors.dart';

class PhoneInputScreen extends StatefulWidget {
  @override
  _PhoneInputScreenState createState() => _PhoneInputScreenState();
}

class _PhoneInputScreenState extends State<PhoneInputScreen> {
  final _phoneNumberController = TextEditingController();

  Future<void> verifyPhoneNumber(BuildContext context) async {
    await FirebaseAuth.instance.verifyPhoneNumber(
      phoneNumber: _phoneNumberController.text,
      verificationCompleted: (PhoneAuthCredential credential) {
        // This callback will be called when auto-retrieval completes
        // For example, auto sign-in (not implemented in this basic example)
      },
      verificationFailed: (FirebaseAuthException e) {
        // Handle verification failure
        print('Verification Failed: ${e.message}');
      },
      codeSent: (String verificationId, int? resendToken) {
        // Navigate to the OTP screen with verificationId
        Navigator.push(
          context,
          MaterialPageRoute(
            builder: (context) => OTPScreen(verificationId),
          ),
        );
      },
      codeAutoRetrievalTimeout: (String verificationId) {},
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(backgroundColor: redColor,

      appBar: AppBar(
        title: Text('Phone Number Verification'),
      ),
      body: Padding(
        padding: EdgeInsets.all(20.0),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          crossAxisAlignment: CrossAxisAlignment.center,
          children: [
            TextField(
              controller: _phoneNumberController,
              keyboardType: TextInputType.phone,
              decoration: InputDecoration(labelText: 'Enter Phone Number'),
            ),
            SizedBox(height: 20),
            ElevatedButton(
              onPressed: () => verifyPhoneNumber(context),
              child: Text('Send OTP'),
            ),
          ],
        ),
      ),
    );
  }
}




class OTPScreen extends StatefulWidget {
  final String verificationId;

  OTPScreen(this.verificationId);

  @override
  _OTPScreenState createState() => _OTPScreenState();
}

class _OTPScreenState extends State<OTPScreen> {
  final _otpController = TextEditingController();

  Future<void> signInWithOTP(String smsCode) async {
    try {
      PhoneAuthCredential phoneAuthCredential = PhoneAuthProvider.credential(
        verificationId: widget.verificationId,
        smsCode: smsCode,
      );
      await FirebaseAuth.instance.signInWithCredential(phoneAuthCredential);
      // Navigate to the home screen after successful verification
      // Replace 'HomeScreen()' with your actual home screen.
      Navigator.pushReplacement(
        context,
        MaterialPageRoute(builder: (context) => HomeScreen()),
      );
    } catch (e) {
      // Handle OTP verification failure
      print('Failed to verify OTP: $e');
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Enter OTP'),
      ),
      body: Padding(
        padding: EdgeInsets.all(20.0),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          crossAxisAlignment: CrossAxisAlignment.center,
          children: [
            TextField(
              controller: _otpController,
              keyboardType: TextInputType.number,
              decoration: InputDecoration(labelText: 'Enter OTP'),
            ),
            SizedBox(height: 20),
            ElevatedButton(
              onPressed: () => signInWithOTP(_otpController.text),
              child: Text('Verify OTP'),
            ),
          ],
        ),
      ),
    );
  }
}


class HomeScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Home'),
      ),
      body: Center(
        child: Text('Welcome to the Home Screen!'),
      ),
    );
  }
}