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:taxglide/view/Main_controller/main_controller.dart';

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

  @override
  ConsumerState<OtpScreen> createState() => _OtpScreenState();
}

class _OtpScreenState extends ConsumerState<OtpScreen> {
  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 mobile;

  @override
  void initState() {
    super.initState();
    final args = Get.arguments as Map<String, dynamic>;
    mobile = 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();

    try {
      await ref.read(loginProvider.notifier).login(mobile);
      final loginState = ref.read(loginProvider);
      loginState.when(
        data: (result) {
          if (result['success'] == true) {
            _validationPopup.showSuccessMessage(
              context,
              "OTP has been resent successfully!",
            );
            _startTimer();
            for (var controller in _controllers) controller.clear();
            setState(() => otpValue = '');
          } else {
            _validationPopup.showErrorMessage(
              context,
              result['error'] ?? "Failed to resend OTP",
            );
          }
        },
        loading: () {},
        error: (error, stack) {
          _validationPopup.showErrorMessage(
            context,
            "Failed to resend OTP. Please try again.",
          );
        },
      );
    } catch (e) {
      _validationPopup.showErrorMessage(
        context,
        "An error occurred. Please try again.",
      );
    }
  }

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

    await ref.read(loginProvider.notifier).verifyOtp(mobile, otpValue);
    final loginState = ref.read(loginProvider);

    loginState.when(
      data: (result) {
        if (result['success'] == true) {
          _validationPopup.showSuccessMessage(
            context,
            "OTP Verified Successfully!",
          );
          Future.delayed(const Duration(seconds: 1), () {
            Get.offAll(() => MainController());
          });
        } else {
          _validationPopup.showErrorMessage(
            context,
            result['error'] ?? "Invalid OTP. Please try again.",
          );
        }
      },
      loading: () {},
      error: (error, stack) {
        _validationPopup.showErrorMessage(
          context,
          "Failed to verify OTP. Please try again.",
        );
      },
    );
  }

  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 loginState = ref.watch(loginProvider);
    final isLoading = loginState is AsyncLoading;

    // Initialize responsive utils
    final r = ResponsiveUtils(context);

    // Responsive values
    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 mobileFontSize = r.fontSize(mobile: 12, tablet: 13, desktop: 14);
    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 spacingXS = r.spacing(mobile: 10, tablet: 10, desktop: 12);
    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: [
          // Background gradient
          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],
              ),
            ),
          ),

          // Scrollable content
          SingleChildScrollView(
            child: SizedBox(
              height: r.screenHeight,
              child: Center(
                child: CommonContainerAuth(
                  child: Column(
                    mainAxisSize: MainAxisSize.min,
                    crossAxisAlignment: CrossAxisAlignment.center,
                    children: [
                      // Logo
                      Image.asset(
                        AppAssets.taxgildelogoauth,
                        width: logoWidth,
                        height: logoHeight,
                        fit: BoxFit.contain,
                      ),
                      SizedBox(height: spacingSM),

                      // Title
                      Text(
                        "Enter OTP",
                        textAlign: TextAlign.center,
                        style: TextStyle(
                          fontFamily: 'Gilroy-SemiBold',
                          fontSize: titleFontSize,
                          fontWeight: FontWeight.w600,
                          height: 1.3,
                          letterSpacing: 0.01 * titleFontSize,
                          color: AppColors.authheading,
                        ),
                      ),
                      SizedBox(height: spacingSM),

                      // Subtitle
                      Text(
                        "OTP has been sent to your registered mobile number",
                        textAlign: TextAlign.center,
                        style: TextStyle(
                          fontFamily: 'Gilroy-SemiBold',
                          fontSize: subtitleFontSize,
                          fontWeight: FontWeight.w600,
                          height: 1.4,
                          letterSpacing: 0.03 * subtitleFontSize,
                          color: AppColors.authleading,
                        ),
                      ),
                      SizedBox(height: spacingMD),

                      // Mobile number + Change
                      Text.rich(
                        TextSpan(
                          text: mobile,
                          style: TextStyle(
                            fontFamily: 'Gilroy-Medium',
                            fontWeight: FontWeight.w500,
                            fontSize: mobileFontSize,
                            height: 1.8,
                            letterSpacing: 0.01,
                            color: AppColors.authleading,
                          ),
                          children: [
                            TextSpan(
                              text: " ( Change Number )",
                              style: TextStyle(
                                fontFamily: 'Gilroy-ExtraBold',
                                fontWeight: FontWeight.w800,
                                fontSize: mobileFontSize,
                                height: 1.8,
                                letterSpacing: 0.04,
                                color: AppColors.authchange,
                              ),
                              recognizer: TapGestureRecognizer()
                                ..onTap = () {
                                  Get.offNamed(
                                    ConstRouters.login,
                                    arguments: {'mobile': mobile},
                                  );
                                },
                            ),
                          ],
                        ),
                        textAlign: TextAlign.center,
                      ),
                      SizedBox(height: spacingLG),

                      // OTP Boxes
                      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: TextField(
                                controller: _controllers[index],
                                focusNode: _focusNodes[index],
                                textAlign: TextAlign.center,
                                keyboardType: TextInputType.number,
                                maxLength: 1,
                                enabled: !isLoading,
                                style: TextStyle(
                                  fontFamily: 'Gilroy-Medium',
                                  fontWeight: FontWeight.w400,
                                  fontSize: otpFontSize,
                                  letterSpacing: 0.03 * otpFontSize,
                                  color: isFilled ? Colors.white : Colors.black,
                                ),
                                decoration: const InputDecoration(
                                  counterText: '',
                                  border: InputBorder.none,
                                ),
                                onChanged: (value) =>
                                    _onOtpChange(index, value),
                              ),
                            ),
                          );
                        }),
                      ),
                      SizedBox(height: spacingXS),

                      // Resend
                      Align(
                        alignment: Alignment.centerRight,
                        child: GestureDetector(
                          onTap: _canResend && !isLoading ? _resendOtp : null,
                          child: Text(
                            "Resend",
                            textAlign: TextAlign.center,
                            style: TextStyle(
                              fontFamily: 'Gilroy-Medium',
                              fontWeight: FontWeight.w500,
                              fontSize: resendFontSize,
                              height: 1.4,
                              letterSpacing: 0.02 * resendFontSize,
                              color: _canResend && !isLoading
                                  ? AppColors.authchange
                                  : Colors.grey,
                            ),
                          ),
                        ),
                      ),
                      SizedBox(height: spacingSM),

                      // Timer
                      Text(
                        _formatTime(_remainingSeconds),
                        style: TextStyle(
                          fontFamily: 'Gilroy-Medium',
                          fontWeight: FontWeight.w600,
                          fontSize: timerFontSize,
                          color: _remainingSeconds > 0
                              ? AppColors.authheading
                              : Colors.red,
                        ),
                      ),
                      SizedBox(height: spacingLG),

                      // Verify Button
                      isLoading
                          ? const CircularProgressIndicator()
                          : CommanButton(text: "Verify", onPressed: _verifyOtp),
                    ],
                  ),
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }
}