// custom_alert_dialog.dart
import 'dart:async';

import 'package:flutter/material.dart';
import 'package:qhd_prevention/customWidget/custom_button.dart';
import 'package:qhd_prevention/main.dart'; // 导入全局 navigatorKey

/// 对话框模式
enum DialogMode { text, input, inputWithCode }

class CustomAlertDialog extends StatefulWidget {
  final String title;
  final String content;
  final String hintText;
  final String cancelText;
  final String confirmText;
  final VoidCallback? onCancel;
  final VoidCallback? onConfirm;
  final ValueChanged<String>? onInputConfirm;
  final DialogMode mode;
  final bool force;

  /// 新增：获取验证码回调，若提供则在用户点击获取验证码时调用。
  /// 回调返回 true 表示获取成功（开始倒计时），返回 false 表示获取失败（不开始倒计时）。
  final Future<bool> Function()? onGetCode;

  const CustomAlertDialog({
    Key? key,
    required this.title,
    this.content = '',
    this.hintText = '',
    this.cancelText = '取消',
    this.confirmText = '确定',
    this.onCancel,
    this.onConfirm,
    this.onInputConfirm,
    this.mode = DialogMode.text,
    this.force = false,
    this.onGetCode,
  }) : super(key: key);

  // ------------------ 静态快捷方法 ------------------

  static Future<bool> showConfirm(
    BuildContext context, {
    required String title,
    String content = '',
    String cancelText = '取消',
    String confirmText = '确定',
    bool barrierDismissible = true,
    VoidCallback? onConfirm,
    bool force = false,
  }) async {
    final result = await showDialog<bool>(
      context: context,
      barrierDismissible: force ? false : barrierDismissible,
      builder:
          (_) => PopScope(
            canPop: false,
            child: CustomAlertDialog(
              title: title,
              content: content,
              cancelText: cancelText,
              confirmText: confirmText,
              onConfirm: onConfirm,
              force: force,
            ),
          ),
    );
    return result == true;
  }

  static Future<void> showAlert(
    BuildContext context, {
    required String title,
    String content = '',
    String confirmText = '确定',
    bool barrierDismissible = true,
    VoidCallback? onConfirm,
    bool force = false,
  }) async {
    await showDialog<void>(
      context: context,
      barrierDismissible: force ? false : barrierDismissible,
      builder:
          (_) => CustomAlertDialog(
            title: title,
            content: content,
            cancelText: '',
            confirmText: confirmText,
            onConfirm: onConfirm,
            force: force,
          ),
    );
  }

  static Future<String?> showInput(
    BuildContext context, {
    required String title,
    String hintText = '',
    String cancelText = '取消',
    String confirmText = '确定',
    bool barrierDismissible = true,
    bool force = false,
  }) async {
    final result = await showDialog<String?>(
      context: context,
      barrierDismissible: force ? false : barrierDismissible,
      builder:
          (_) => CustomAlertDialog(
            title: title,
            hintText: hintText,
            cancelText: cancelText,
            confirmText: confirmText,
            mode: DialogMode.input,
            force: force,
          ),
    );
    // 取消/点遮罩会得到 null；确认会得到 String（可能为空串）
    return result;
  }

  /// 新增：快捷方法——输入框 + 获取验证码
  static Future<String?> showInputWithCode(
    BuildContext context, {
    required String title,
    String hintText = '',
    String cancelText = '取消',
    String confirmText = '确定',
    bool barrierDismissible = true,
    bool force = false,
    Future<bool> Function()? onGetCode,
    ValueChanged<String>? onConfirm, // <-- 这里改为带参数的回调
  }) async {
    final result = await showDialog<String?>(
      context: context,
      barrierDismissible: force ? false : barrierDismissible,
      builder:
          (_) => CustomAlertDialog(
            title: title,
            hintText: hintText,
            cancelText: cancelText,
            confirmText: confirmText,
            mode: DialogMode.inputWithCode,
            force: force,
            onGetCode: onGetCode,
            onInputConfirm: onConfirm, // 把回调传给内部使用的 onInputConfirm
          ),
    );
    return result;
  }

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

class _CustomAlertDialogState extends State<CustomAlertDialog> {
  late TextEditingController _controller;
  bool _isClosing = false;

  // 验证码计时器相关
  Timer? _timer;
  int _seconds = 0;
  static const int _defaultCountdown = 60;

  @override
  void initState() {
    super.initState();
    _controller = TextEditingController();
  }

  @override
  void dispose() {
    _timer?.cancel();
    _controller.dispose();
    super.dispose();
  }

  bool get hasCancel => !widget.force && widget.cancelText.isNotEmpty;

  void _closeDialog([dynamic result]) {
    if (_isClosing) return;
    _isClosing = true;

    // 优先使用当前上下文导航
    if (mounted) {
      Navigator.of(context).pop(result);
    } else {
      // 后备方案：使用全局导航键
      navigatorKey.currentState?.pop(result);
    }
  }

  void _startCountdown([int seconds = _defaultCountdown]) {
    _timer?.cancel();
    setState(() {
      _seconds = seconds;
    });
    _timer = Timer.periodic(const Duration(seconds: 1), (t) {
      if (!mounted) {
        t.cancel();
        return;
      }
      if (_seconds <= 1) {
        t.cancel();
        setState(() {
          _seconds = 0;
        });
      } else {
        setState(() {
          _seconds -= 1;
        });
      }
    });
  }

  Future<void> _onGetCodePressed() async {
    if (_seconds > 0) return; // 正在倒计时，忽略
    // 如果外部提供了回调，等待其执行并根据返回值决定是否开始倒计时
    if (widget.onGetCode != null) {
      await widget.onGetCode!();
      _startCountdown();
    } else {
      // 未提供回调：默认直接开始倒计时（方便调试）
      _startCountdown();
    }
  }

  @override
  Widget build(BuildContext context) {
    return PopScope(
      canPop: !widget.force,
      child: Dialog(
        backgroundColor: Colors.transparent,
        child: Container(
          constraints: const BoxConstraints(minWidth: 280),
          decoration: BoxDecoration(
            color: Colors.white,
            borderRadius: BorderRadius.circular(8),
          ),
          child: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              const SizedBox(height: 20),
              Padding(
                padding: const EdgeInsets.symmetric(horizontal: 20),
                child: Text(
                  widget.title,
                  style: const TextStyle(
                    fontSize: 18,
                    fontWeight: FontWeight.bold,
                  ),
                  textAlign: TextAlign.center,
                ),
              ),
              const SizedBox(height: 16),
              if (widget.mode == DialogMode.text)
                Padding(
                  padding: const EdgeInsets.symmetric(horizontal: 24),
                  child: Text(
                    widget.content,
                    style: const TextStyle(fontSize: 16, color: Colors.black54),
                    textAlign: TextAlign.center,
                  ),
                )
              else if (widget.mode == DialogMode.input)
                Padding(
                  padding: const EdgeInsets.symmetric(horizontal: 20),
                  child: TextField(
                    controller: _controller,
                    autofocus: true,
                    decoration: InputDecoration(
                      hintText: widget.hintText,
                      border: const OutlineInputBorder(),
                      focusedBorder: OutlineInputBorder(
                        borderSide: BorderSide(color: Colors.blue, width: 1),
                        borderRadius: BorderRadius.circular(4),
                      ),
                      isDense: true,
                      contentPadding: const EdgeInsets.symmetric(
                        vertical: 10,
                        horizontal: 10,
                      ),
                    ),
                  ),
                )
              else // DialogMode.inputWithCode
                Padding(
                  padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 10),
                  child: Row(
                    children: [
                      Expanded(
                        child: TextField(
                          controller: _controller,
                          autofocus: true,
                          decoration: InputDecoration(
                            hintText: widget.hintText,
                            border: const OutlineInputBorder(),
                            focusedBorder: OutlineInputBorder(
                              borderSide: BorderSide(
                                color: Colors.blue,
                                width: 1,
                              ),
                              borderRadius: BorderRadius.circular(4),
                            ),
                            isDense: true,
                            contentPadding: const EdgeInsets.symmetric(
                              vertical: 10,
                              horizontal: 10,
                            ),
                          ),
                        ),
                      ),
                      const SizedBox(width: 8),
                      SizedBox(
                        height: 44,
                        width: 100,
                        child: CustomButton(
                          text: _seconds > 0 ? '$_seconds s' : '发送验证码',
                          onPressed: _seconds > 0 ? null : _onGetCodePressed,
                        ),
                      ),
                    ],
                  ),
                ),
              const SizedBox(height: 20),
              const Divider(height: 1),
              hasCancel
                  ? _buildDoubleButtons(context)
                  : _buildSingleButton(context),
            ],
          ),
        ),
      ),
    );
  }

  Widget _buildDoubleButtons(BuildContext context) {
    return Row(
      children: [
        Expanded(
          child: InkWell(
            onTap: () {
              widget.onCancel?.call();
              _closeDialog(widget.mode == DialogMode.text ? false : null);
            },
            child: Container(
              padding: const EdgeInsets.symmetric(vertical: 12),
              alignment: Alignment.center,
              child: Text(
                widget.cancelText,
                style: const TextStyle(
                  fontWeight: FontWeight.w500,
                  color: Colors.black87,
                  fontSize: 18,
                ),
              ),
            ),
          ),
        ),
        Container(width: 1, height: 48, color: Colors.grey[300]),
        Expanded(
          child: InkWell(
            onTap: () {
              if (widget.mode == DialogMode.text) {
                widget.onConfirm?.call();
                _closeDialog(true);
              } else {
                final value = _controller.text.trim();
                widget.onInputConfirm?.call(value);
                _closeDialog(value);
              }
            },
            child: Container(
              padding: const EdgeInsets.symmetric(vertical: 12),
              alignment: Alignment.center,
              child: Text(
                widget.confirmText,
                style: const TextStyle(
                  color: Color(0xFF1C61FF),
                  fontWeight: FontWeight.w500,
                  fontSize: 18,
                ),
              ),
            ),
          ),
        ),
      ],
    );
  }

  Widget _buildSingleButton(BuildContext context) {
    return InkWell(
      onTap: () {
        if (widget.mode == DialogMode.text) {
          widget.onConfirm?.call();
          _closeDialog(true);
        } else {
          final value = _controller.text.trim();
          widget.onInputConfirm?.call(value);
          _closeDialog(value);
        }
      },
      child: Container(
        width: double.infinity,
        padding: const EdgeInsets.symmetric(vertical: 14),
        alignment: Alignment.center,
        child: Text(
          widget.confirmText,
          style: const TextStyle(
            color: Color(0xFF1C61FF),
            fontWeight: FontWeight.w500,
            fontSize: 18,
          ),
        ),
      ),
    );
  }
}