import 'package:flutter/material.dart';
import '../../../../app/theme/app_colors.dart';
import '../../../../app/theme/app_typography.dart';
import '../../../../app/theme/app_spacing.dart';
import '../../../../shared/widgets/genex_button.dart';

/// A1. 手机号注册页
///
/// 手机号输入、获取验证码、设置密码、用户协议勾选
/// 注册成功后后台静默创建MPC钱包
class RegisterPage extends StatefulWidget {
  final bool isEmail;

  const RegisterPage({super.key, this.isEmail = false});

  @override
  State<RegisterPage> createState() => _RegisterPageState();
}

class _RegisterPageState extends State<RegisterPage> {
  final _accountController = TextEditingController();
  final _codeController = TextEditingController();
  final _passwordController = TextEditingController();
  bool _obscurePassword = true;
  bool _agreeTerms = false;

  @override
  void dispose() {
    _accountController.dispose();
    _codeController.dispose();
    _passwordController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        leading: IconButton(
          icon: const Icon(Icons.arrow_back_ios_new_rounded, size: 20),
          onPressed: () => Navigator.of(context).pop(),
        ),
      ),
      body: SafeArea(
        child: SingleChildScrollView(
          padding: AppSpacing.pagePadding,
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              const SizedBox(height: 16),
              Text('创建账号', style: AppTypography.displayMedium),
              const SizedBox(height: 8),
              Text(
                widget.isEmail ? '使用邮箱注册 Genex 账号' : '使用手机号注册 Genex 账号',
                style: AppTypography.bodyLarge.copyWith(color: AppColors.textSecondary),
              ),
              const SizedBox(height: 40),

              // Step indicator
              _buildStepIndicator(),
              const SizedBox(height: 32),

              // Account Input (Phone/Email)
              Text(
                widget.isEmail ? '邮箱地址' : '手机号',
                style: AppTypography.labelMedium,
              ),
              const SizedBox(height: 8),
              TextField(
                controller: _accountController,
                keyboardType:
                    widget.isEmail ? TextInputType.emailAddress : TextInputType.phone,
                decoration: InputDecoration(
                  hintText: widget.isEmail ? '请输入邮箱地址' : '请输入手机号',
                  prefixIcon: Icon(
                    widget.isEmail ? Icons.email_outlined : Icons.phone_android_rounded,
                    color: AppColors.textTertiary,
                  ),
                ),
              ),
              const SizedBox(height: 20),

              // Verification Code
              Text('验证码', style: AppTypography.labelMedium),
              const SizedBox(height: 8),
              Row(
                children: [
                  Expanded(
                    child: TextField(
                      controller: _codeController,
                      keyboardType: TextInputType.number,
                      maxLength: 6,
                      decoration: const InputDecoration(
                        hintText: '请输入6位验证码',
                        counterText: '',
                        prefixIcon: Icon(Icons.shield_outlined, color: AppColors.textTertiary),
                      ),
                    ),
                  ),
                  const SizedBox(width: 12),
                  SizedBox(
                    height: AppSpacing.inputHeight,
                    child: GenexButton(
                      label: '获取验证码',
                      variant: GenexButtonVariant.secondary,
                      size: GenexButtonSize.medium,
                      fullWidth: false,
                      onPressed: () {},
                    ),
                  ),
                ],
              ),
              const SizedBox(height: 20),

              // Password
              Text('设置密码', style: AppTypography.labelMedium),
              const SizedBox(height: 8),
              TextField(
                controller: _passwordController,
                obscureText: _obscurePassword,
                decoration: InputDecoration(
                  hintText: '8-20位，含字母和数字',
                  prefixIcon: const Icon(Icons.lock_outline_rounded, color: AppColors.textTertiary),
                  suffixIcon: IconButton(
                    icon: Icon(
                      _obscurePassword
                          ? Icons.visibility_off_outlined
                          : Icons.visibility_outlined,
                      color: AppColors.textTertiary,
                      size: 20,
                    ),
                    onPressed: () => setState(() => _obscurePassword = !_obscurePassword),
                  ),
                ),
              ),
              const SizedBox(height: 8),
              _buildPasswordStrength(),
              const SizedBox(height: 32),

              // Terms Agreement
              Row(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  SizedBox(
                    width: 20,
                    height: 20,
                    child: Checkbox(
                      value: _agreeTerms,
                      onChanged: (v) => setState(() => _agreeTerms = v ?? false),
                      activeColor: AppColors.primary,
                      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(4)),
                    ),
                  ),
                  const SizedBox(width: 8),
                  Expanded(
                    child: GestureDetector(
                      onTap: () => setState(() => _agreeTerms = !_agreeTerms),
                      child: RichText(
                        text: TextSpan(
                          style: AppTypography.bodySmall,
                          children: [
                            const TextSpan(text: '我已阅读并同意 '),
                            TextSpan(
                              text: '《用户协议》',
                              style: AppTypography.bodySmall.copyWith(color: AppColors.primary),
                            ),
                            const TextSpan(text: ' 和 '),
                            TextSpan(
                              text: '《隐私政策》',
                              style: AppTypography.bodySmall.copyWith(color: AppColors.primary),
                            ),
                          ],
                        ),
                      ),
                    ),
                  ),
                ],
              ),
              const SizedBox(height: 32),

              // Register Button
              GenexButton(
                label: '注册',
                onPressed: _agreeTerms ? () {
                  // Auth: register → silent MPC wallet creation
                } : null,
              ),
              const SizedBox(height: 40),
            ],
          ),
        ),
      ),
    );
  }

  Widget _buildStepIndicator() {
    return Row(
      children: [
        _buildStep(1, '验证', true),
        _buildStepLine(true),
        _buildStep(2, '设密码', true),
        _buildStepLine(false),
        _buildStep(3, '完成', false),
      ],
    );
  }

  Widget _buildStep(int number, String label, bool active) {
    return Column(
      children: [
        Container(
          width: 28,
          height: 28,
          decoration: BoxDecoration(
            color: active ? AppColors.primary : AppColors.gray200,
            shape: BoxShape.circle,
          ),
          child: Center(
            child: Text(
              '$number',
              style: TextStyle(
                color: active ? Colors.white : AppColors.textTertiary,
                fontSize: 13,
                fontWeight: FontWeight.w600,
              ),
            ),
          ),
        ),
        const SizedBox(height: 4),
        Text(
          label,
          style: AppTypography.caption.copyWith(
            color: active ? AppColors.primary : AppColors.textTertiary,
          ),
        ),
      ],
    );
  }

  Widget _buildStepLine(bool active) {
    return Expanded(
      child: Container(
        height: 2,
        margin: const EdgeInsets.only(bottom: 18),
        color: active ? AppColors.primary : AppColors.gray200,
      ),
    );
  }

  Widget _buildPasswordStrength() {
    final password = _passwordController.text;
    final hasLength = password.length >= 8;
    final hasLetter = RegExp(r'[a-zA-Z]').hasMatch(password);
    final hasDigit = RegExp(r'\d').hasMatch(password);

    return Row(
      children: [
        _buildCheck('8位以上', hasLength),
        const SizedBox(width: 16),
        _buildCheck('含字母', hasLetter),
        const SizedBox(width: 16),
        _buildCheck('含数字', hasDigit),
      ],
    );
  }

  Widget _buildCheck(String label, bool passed) {
    return Row(
      mainAxisSize: MainAxisSize.min,
      children: [
        Icon(
          passed ? Icons.check_circle_rounded : Icons.circle_outlined,
          size: 14,
          color: passed ? AppColors.success : AppColors.textTertiary,
        ),
        const SizedBox(width: 4),
        Text(
          label,
          style: AppTypography.caption.copyWith(
            color: passed ? AppColors.success : AppColors.textTertiary,
          ),
        ),
      ],
    );
  }
}