import 'dart:async';
import 'package:flutter/material.dart';
import 'package:intl/intl.dart';


class HiddenRollWidget extends StatefulWidget {
  /// 隐患列表数据
  final List<Map<String, dynamic>> hiddenList;
  /// 每行高度
  final double rowHeight;
  /// 同一时间可见的行数
  final int visibleCount;
  /// 滚动间隔
  final Duration interval;
  /// 点击回调，传递 HIDDEN_ID
  final ValueChanged<String>? onItemTap;

  const HiddenRollWidget({
    Key? key,
    required this.hiddenList,
    this.rowHeight = 35,
    this.visibleCount = 5,
    this.interval = const Duration(seconds: 3),
    this.onItemTap,
  }) : super(key: key);

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

class _HiddenRollWidgetState extends State<HiddenRollWidget> {
  late final ScrollController _ctrl;
  late final Timer _timer;
  int _currentIndex = 0;

  @override
  void initState() {
    super.initState();
    _ctrl = ScrollController();
    _timer = Timer.periodic(widget.interval, (_) => _scrollToNext());
  }

  void _scrollToNext() {
    if (!_ctrl.hasClients || widget.hiddenList.isEmpty) return;
    _currentIndex++;
    if (_currentIndex >= widget.hiddenList.length) {
      _currentIndex = 0;
      _ctrl.jumpTo(0);
    } else {
      _ctrl.animateTo(
        widget.rowHeight * _currentIndex,
        duration: const Duration(milliseconds: 400),
        curve: Curves.easeInOut,
      );
    }
  }

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

  @override
  Widget build(BuildContext context) {
    // 容器高度 = 行高 * 可见行数
    return SizedBox(
      height: widget.rowHeight * widget.visibleCount,
      child: ListView.builder(
        controller: _ctrl,
        physics: const NeverScrollableScrollPhysics(),
        itemExtent: widget.rowHeight,
        itemCount: widget.hiddenList.length,
        itemBuilder: (_, idx) {
          final item = widget.hiddenList[idx];
          // 原始时间字符串
          String rawTime = item['CREATTIME'] ?? '';
          DateTime? dt;
          if (rawTime.isNotEmpty) {
            try {
              dt = DateTime.parse(rawTime.replaceAll('-', '/'));
            } catch (_) {}
          }
          // 去除年份，仅保留 MM-dd HH:mm
          String displayTime;
          if (dt != null) {
            displayTime = DateFormat('MM-dd HH:mm').format(dt);
          } else {
            final parts = rawTime.split(' ');
            if (parts.length >= 2) {
              final datePart = parts[0];
              final timePart = parts[1];
              final mmdd = datePart.length >= 5 ? datePart.substring(5) : datePart;
              final hm = timePart.length >= 5 ? timePart.substring(0, 5) : timePart;
              displayTime = '$mmdd $hm';
            } else {
              displayTime = rawTime;
            }
          }
          // 隐患描述裁剪
          String descr = item['HIDDENDESCR'] ?? '';
          final displayDescr = descr.length > 10 ? '${descr.substring(0, 10)}...' : descr;
          return InkWell(
            onTap: () => widget.onItemTap?.call(item['HIDDEN_ID'] as String),
            child: Padding(
              padding: const EdgeInsets.symmetric(horizontal: 15),
              child: Row(
                mainAxisAlignment: MainAxisAlignment.spaceBetween,
                children: [
                  Expanded(
                    flex: 3,
                    child: Text(
                      displayDescr,
                      overflow: TextOverflow.ellipsis,
                    ),
                  ),
                  Expanded(
                    flex: 2,
                    child: Text(
                      item['CREATORNAME'] ?? '',
                      textAlign: TextAlign.center,
                      overflow: TextOverflow.ellipsis,
                    ),
                  ),
                  Expanded(
                    flex: 2,
                    child: Text(
                      displayTime,
                      textAlign: TextAlign.right,
                      overflow: TextOverflow.ellipsis,
                    ),
                  ),
                ],
              ),
            ),
          );
        },
      ),
    );
  }
}