import 'dart:async';
import 'package:flutter/gestures.dart';
import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:get/get.dart';
import 'package:taxglide/consts/app_asstes.dart';
import 'package:taxglide/consts/app_colors.dart';
import 'package:taxglide/consts/comman_button.dart';
import 'package:taxglide/consts/comman_container_auth.dart';
import 'package:taxglide/consts/responsive_helper.dart';
import 'package:taxglide/consts/validation_popup.dart';
import 'package:taxglide/controller/api_contoller.dart';
import 'package:taxglide/router/consts_routers.dart';
import 'package:flutter/services.dart';
import 'package:taxglide/consts/app_style.dart';

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

  @override
  ConsumerState<EmployeeOtpScreen> createState() => _EmployeeOtpScreenState();
}

class _EmployeeOtpScreenState extends ConsumerState<EmployeeOtpScreen> {
  final ValidationPopup _validationPopup = ValidationPopup();
  final int otpLength = 4;
  final List<TextEditingController> _controllers = [];
  final List<FocusNode> _focusNodes = [];
  String otpValue = '';

  Timer? _timer;
  int _remainingSeconds = 600;
  bool _canResend = false;

  late String _identifier;
  bool _fromForgot = false;
  bool _isEmployee = true;

  @override
  void initState() {
    super.initState();
    final args = Get.arguments as Map<String, dynamic>? ?? {};
    _fromForgot = args['fromForgot'] ?? false;
    _identifier = args['email'] ?? args['mobile'] ?? '';

    for (int i = 0; i < otpLength; i++) {
      _controllers.add(TextEditingController());
      _focusNodes.add(FocusNode());
    }
    _startTimer();
  }

  @override
  void dispose() {
    _timer?.cancel();
    for (var c in _controllers) c.dispose();
    for (var f in _focusNodes) f.dispose();
    super.dispose();
  }

  void _startTimer() {
    _canResend = false;
    _remainingSeconds = 30;
    _timer?.cancel();
    _timer = Timer.periodic(const Duration(seconds: 1), (timer) {
      if (_remainingSeconds > 0) {
        setState(() => _remainingSeconds--);
      } else {
        setState(() => _canResend = true);
        timer.cancel();
      }
    });
  }

  String _formatTime(int seconds) {
    int minutes = seconds ~/ 60;
    int remainingSeconds = seconds % 60;
    return '${minutes.toString().padLeft(2, '0')}:${remainingSeconds.toString().padLeft(2, '0')}';
  }

  void _resendOtp() async {
    if (!_canResend) return;
    for (var controller in _controllers) controller.clear();
    setState(() => otpValue = '');
    _focusNodes[0].requestFocus();

    if (_fromForgot) {
      await ref.read(forgotPasswordProvider.notifier).requestOtp(_identifier, _isEmployee);
      final state = ref.read(forgotPasswordProvider);
      state.when(
        data: (result) {
          if (result['success'] == true) {
            _validationPopup.showSuccessMessage(context, "OTP has been resent successfully!");
            _startTimer();
          } else {
            _validationPopup.showErrorMessage(context, result['error'] ?? "Failed to resend OTP");
          }
        },
        loading: () {},
        error: (error, _) => _validationPopup.showErrorMessage(context, "Failed to resend OTP"),
      );
    } else {
      await ref.read(employeeloginProvider.notifier).login(_identifier);
      final state = ref.read(employeeloginProvider);
      state.when(
        data: (result) {
          if (result['success'] == true) {
            _validationPopup.showSuccessMessage(context, "OTP has been resent successfully!");
            _startTimer();
          } else {
            _validationPopup.showErrorMessage(context, result['error'] ?? "Failed to resend OTP");
          }
        },
        loading: () {},
        error: (error, _) => _validationPopup.showErrorMessage(context, "Failed to resend OTP"),
      );
    }
  }

  void _verifyOtp() async {
    if (otpValue.length != otpLength) {
      _validationPopup.showErrorMessage(context, "Please enter all OTP digits");
      return;
    }

    if (_fromForgot) {
      await ref.read(forgotPasswordProvider.notifier).verifyOtp(_identifier, otpValue);
      final state = ref.read(forgotPasswordProvider);
      state.when(
        data: (result) {
          if (result['success'] == true) {
            _validationPopup.showSuccessMessage(context, "OTP Verified successfully!");
            Get.toNamed(ConstRouters.mpinSet);
          } else {
            _validationPopup.showErrorMessage(context, result['error'] ?? "Invalid OTP");
          }
        },
        loading: () {},
        error: (err, _) => _validationPopup.showErrorMessage(context, "Verification failed"),
      );
    } else {
      await ref.read(employeeloginProvider.notifier).verifyOtp(_identifier, otpValue);
      final state = ref.read(employeeloginProvider);
      state.when(
        data: (result) {
          if (result['success'] == true) {
             _validationPopup.showSuccessMessage(context, "OTP Verified successfully!");
              Get.offAllNamed(ConstRouters.mpinSet);
          } else {
            _validationPopup.showErrorMessage(context, result['error'] ?? "Invalid OTP");
          }
        },
        loading: () {},
        error: (err, _) => _validationPopup.showErrorMessage(context, "Verification failed"),
      );
    }
  }

  void _onOtpChange(int index, String value) {
    if (value.isNotEmpty && index < otpLength - 1) {
      _focusNodes[index + 1].requestFocus();
    }
    if (value.isEmpty && index > 0) {
      _focusNodes[index - 1].requestFocus();
    }
    setState(() {
      otpValue = _controllers.map((c) => c.text).join();
    });
  }

  @override
  Widget build(BuildContext context) {
    final isLoading = _fromForgot 
        ? ref.watch(forgotPasswordProvider).isLoading 
        : ref.watch(employeeloginProvider).isLoading;

    final r = ResponsiveUtils(context);

    final logoWidth = r.getValue<double>(mobile: 120, tablet: 141, desktop: 160);
    final logoHeight = r.getValue<double>(mobile: 85, tablet: 100, desktop: 115);
    final titleFontSize = r.fontSize(mobile: 26, tablet: 32, desktop: 36);
    final subtitleFontSize = r.fontSize(mobile: 13, tablet: 14, desktop: 15);
    final resendFontSize = r.fontSize(mobile: 13, tablet: 14, desktop: 15);
    final timerFontSize = r.fontSize(mobile: 14, tablet: 16, desktop: 18);

    final otpBoxWidth = r.getValue<double>(mobile: 52, tablet: 60, desktop: 68);
    final otpBoxHeight = r.getValue<double>(mobile: 48, tablet: 56, desktop: 64);
    final otpFontSize = r.fontSize(mobile: 22, tablet: 28, desktop: 32);
    final otpBoxMargin = r.getValue<double>(mobile: 5, tablet: 6, desktop: 8);
    final otpBoxRadius = r.getValue<double>(mobile: 5, tablet: 6, desktop: 8);

    final spacingSM = r.spacing(mobile: 20, tablet: 20, desktop: 24);
    final spacingMD = r.spacing(mobile: 22, tablet: 22, desktop: 26);
    final spacingLG = r.spacing(mobile: 30, tablet: 30, desktop: 36);

    return Scaffold(
      body: Stack(
        children: [
          Container(
            decoration: const BoxDecoration(
              gradient: LinearGradient(
                begin: Alignment.topLeft,
                end: Alignment.bottomRight,
                colors: [
                  Color(0xFFFFF8F0),
                  Color(0xFFEBC894),
                  Color(0xFFE8DAF2),
                  Color(0xFFB49EF4),
                ],
                stops: [0.0, 0.3, 0.6, 1.0],
              ),
            ),
          ),
          SingleChildScrollView(
            child: SizedBox(
              height: r.screenHeight,
              child: Center(
                child: CommonContainerAuth(
                  child: Column(
                    mainAxisSize: MainAxisSize.min,
                    children: [
                      Image.asset(
                        AppAssets.taxgildelogoauth,
                        width: logoWidth,
                        height: logoHeight,
                        fit: BoxFit.contain,
                      ),
                      SizedBox(height: spacingSM),
                      Text(
                        "Enter Staff OTP",
                        style: AppTextStyles.bold.copyWith(
                          fontSize: titleFontSize,
                          color: AppColors.authheading,
                        ),
                      ),
                      SizedBox(height: spacingSM),
                      Text(
                        "OTP has been sent to ${_identifier}",
                        textAlign: TextAlign.center,
                        style: AppTextStyles.medium.copyWith(
                          fontSize: subtitleFontSize,
                          color: AppColors.authleading,
                        ),
                      ),
                      SizedBox(height: spacingMD),
                      Row(
                        mainAxisAlignment: MainAxisAlignment.center,
                        children: List.generate(otpLength, (index) {
                          bool isFilled = _controllers[index].text.isNotEmpty;
                          return Container(
                            margin: EdgeInsets.symmetric(horizontal: otpBoxMargin),
                            width: otpBoxWidth,
                            height: otpBoxHeight,
                            decoration: BoxDecoration(
                              color: isFilled ? AppColors.commanbutton : Colors.white,
                              borderRadius: BorderRadius.circular(otpBoxRadius),
                              border: Border.all(color: const Color(0xFFDFDFDF)),
                              boxShadow: [
                                BoxShadow(
                                  color: const Color(0xFFBDBDBD).withOpacity(0.25),
                                  blurRadius: 7,
                                  offset: const Offset(0, 1),
                                ),
                              ],
                            ),
                             child: Center(
                               child: KeyboardListener(
                                 focusNode: FocusNode(),
                                 onKeyEvent: (event) {
                                   if (event is KeyDownEvent &&
                                       event.logicalKey ==
                                           LogicalKeyboardKey.backspace) {
                                     if (_controllers[index].text.isEmpty &&
                                         index > 0) {
                                       _focusNodes[index - 1].requestFocus();
                                     }
                                   }
                                 },
                                 child: TextField(
                                   controller: _controllers[index],
                                   focusNode: _focusNodes[index],
                                   textAlign: TextAlign.center,
                                   keyboardType: TextInputType.number,
                                   maxLength: 1,
                                   enabled: !isLoading,
                                   style: TextStyle(
                                     fontFamily: "Gilroy",
                                     fontWeight: FontWeight.w400,
                                     fontSize: otpFontSize,
                                     color: isFilled ? Colors.white : Colors.black,
                                   ),
                                   decoration: const InputDecoration(
                                     counterText: '',
                                     border: InputBorder.none,
                                   ),
                                   onChanged: (value) =>
                                       _onOtpChange(index, value),
                                 ),
                               ),
                             ),
                          );
                        }),
                      ),
                      SizedBox(height: spacingSM),
                      Align(
                        alignment: Alignment.centerRight,
                        child: GestureDetector(
                          onTap: _canResend && !isLoading ? _resendOtp : null,
                          child: Text(
                            "Resend",
                            style: AppTextStyles.medium.copyWith(
                              fontSize: resendFontSize,
                              color: _canResend && !isLoading
                                  ? AppColors.authchange
                                  : Colors.grey,
                            ),
                          ),
                        ),
                      ),
                      SizedBox(height: spacingSM),
                      Text(
                        _formatTime(_remainingSeconds),
                        style: AppTextStyles.semiBold.copyWith(
                          fontSize: timerFontSize,
                          color: _remainingSeconds > 0 ? AppColors.authheading : Colors.red,
                        ),
                      ),
                      SizedBox(height: spacingLG),
                      isLoading
                          ? const CircularProgressIndicator()
                          : CommanButton(text: "Verify", onPressed: _verifyOtp),
                    ],
                  ),
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }
}