import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:get/get.dart';

import '../../../core/theme/app_palette.dart';
import '../../../data/services/id_verify_service.dart';

/// 实名认证输入弹窗：姓名 + 身份证号。
///
/// 已实名时进来就是「修改认证」——姓名预填上次的值，身份证号必须重新输入
/// （服务端只存掩码，拿不回原文，也不该拿回）。
///
/// 返回 true 表示这次认证通过。
Future<bool> showIdVerifyDialog({String? reasonText}) async {
  final ok = await Get.dialog<bool>(
    IdVerifyDialog(reasonText: reasonText),
    barrierDismissible: false,
  );
  return ok == true;
}

/// ⚠️ 必须是 StatefulWidget：TextEditingController 要由 State 自己持有、
/// 在 State.dispose() 里释放。
///
/// 早先的写法是在外面 `await Get.dialog(...)` 之后立刻 dispose——那是错的：
/// Get.dialog 在路由 pop 的瞬间就返回，而弹窗此时还在播退场动画、里面的
/// TextField 仍挂在树上，controller 被提前释放会破坏元素树，
/// 表现为红屏 `'_dependents.isEmpty': is not true`。
class IdVerifyDialog extends StatefulWidget {
  const IdVerifyDialog({Key? key, this.reasonText}) : super(key: key);

  final String? reasonText;

  @override
  State<IdVerifyDialog> createState() => _IdVerifyDialogState();
}

class _IdVerifyDialogState extends State<IdVerifyDialog> {
  late final bool _isModify;
  late final TextEditingController _nameCtrl;
  late final TextEditingController _idCtrl;

  String _error = '';
  bool _busy = false;

  @override
  void initState() {
    super.initState();
    final svc = IdVerifyService.to;
    _isModify = svc.verified.value;
    _nameCtrl = TextEditingController(text: _isModify ? svc.realname.value : '');
    _idCtrl = TextEditingController();
  }

  @override
  void dispose() {
    _nameCtrl.dispose();
    _idCtrl.dispose();
    super.dispose();
  }

  Future<void> _submit() async {
    if (_busy) return;
    setState(() {
      _busy = true;
      _error = '';
    });
    final msg = await IdVerifyService.to.submit(_nameCtrl.text, _idCtrl.text);
    // 请求回来时弹窗可能已经被关掉了，不能再 setState。
    if (!mounted) return;
    if (msg == null) {
      Navigator.of(context).pop(true);
      return;
    }
    setState(() {
      _busy = false;
      _error = msg;
    });
  }

  @override
  Widget build(BuildContext context) {
    final isDark = Theme.of(context).brightness == Brightness.dark;
    return AlertDialog(
      backgroundColor: AppPalette.surface(isDark),
      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16.r)),
      title: Text(
        _isModify ? 'idVerifyModifyTitle'.tr : 'idVerifyTitle'.tr,
        style: TextStyle(
          fontSize: 17.sp,
          fontWeight: FontWeight.w600,
          color: AppPalette.textPrimary(isDark),
        ),
      ),
      content: SingleChildScrollView(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text(
              widget.reasonText ?? 'idVerifyDesc'.tr,
              style: TextStyle(
                fontSize: 13.sp,
                height: 1.6,
                color: AppPalette.textSecondary(isDark),
              ),
            ),
            SizedBox(height: 16.h),
            _field(
              isDark: isDark,
              controller: _nameCtrl,
              label: 'idVerifyNameLabel'.tr,
              hint: 'idVerifyNameHint'.tr,
              maxLength: 32,
            ),
            SizedBox(height: 12.h),
            _field(
              isDark: isDark,
              controller: _idCtrl,
              label: 'idVerifyIdLabel'.tr,
              hint: _isModify ? 'idVerifyIdHintModify'.tr : 'idVerifyIdHint'.tr,
              maxLength: 18,
              // 身份证号只有数字和末位 X
              formatters: [
                FilteringTextInputFormatter.allow(RegExp(r'[0-9xX]')),
                _UpperCaseFormatter(),
              ],
            ),
            if (_error.isNotEmpty)
              Padding(
                padding: EdgeInsets.only(top: 10.h),
                child: Text(
                  _error,
                  style: TextStyle(fontSize: 12.sp, color: Colors.redAccent),
                ),
              ),
            SizedBox(height: 10.h),
            Text(
              'idVerifyPrivacyTip'.tr,
              style: TextStyle(
                fontSize: 11.sp,
                height: 1.5,
                color: AppPalette.textHint(isDark),
              ),
            ),
          ],
        ),
      ),
      actions: [
        TextButton(
          onPressed: _busy ? null : () => Navigator.of(context).pop(false),
          child: Text('cancel'.tr,
              style: TextStyle(
                  fontSize: 14.sp, color: AppPalette.textHint(isDark))),
        ),
        TextButton(
          onPressed: _busy ? null : _submit,
          child: _busy
              ? SizedBox(
                  width: 16.w,
                  height: 16.w,
                  child: const CircularProgressIndicator(strokeWidth: 2),
                )
              : Text('idVerifySubmit'.tr,
                  style: TextStyle(
                      fontSize: 14.sp,
                      fontWeight: FontWeight.w600,
                      color: AppPalette.accent)),
        ),
      ],
    );
  }

  Widget _field({
    required bool isDark,
    required TextEditingController controller,
    required String label,
    required String hint,
    required int maxLength,
    List<TextInputFormatter>? formatters,
  }) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Text(label,
            style: TextStyle(
                fontSize: 12.sp, color: AppPalette.textSecondary(isDark))),
        SizedBox(height: 6.h),
        TextField(
          controller: controller,
          maxLength: maxLength,
          inputFormatters: formatters,
          style:
              TextStyle(fontSize: 14.sp, color: AppPalette.textPrimary(isDark)),
          decoration: InputDecoration(
            counterText: '',
            hintText: hint,
            hintStyle:
                TextStyle(fontSize: 13.sp, color: AppPalette.textHint(isDark)),
            isDense: true,
            contentPadding:
                EdgeInsets.symmetric(horizontal: 12.w, vertical: 12.h),
            border:
                OutlineInputBorder(borderRadius: BorderRadius.circular(10.r)),
            enabledBorder: OutlineInputBorder(
              borderRadius: BorderRadius.circular(10.r),
              borderSide: BorderSide(color: AppPalette.textHint(isDark)),
            ),
          ),
        ),
      ],
    );
  }
}

/// 身份证末位的 x 统一成大写 X，省得因为大小写把合法号码判成非法。
class _UpperCaseFormatter extends TextInputFormatter {
  @override
  TextEditingValue formatEditUpdate(
      TextEditingValue oldValue, TextEditingValue newValue) {
    return newValue.copyWith(text: newValue.text.toUpperCase());
  }
}