import 'package:flutter/material.dart';
import 'package:flyinsonolite/controls/text/fistext.dart';
import 'package:flyinsonolite/infrastructure/scale.dart';

typedef void ValueCallback<T>(T value);

/// 音量调节控件 0-100
class VolumeSlider extends StatefulWidget {
  final void Function(int) onVolumeChanged;
  final Widget child;
  final int initVolume;
  final double extraOffsetX;

  const VolumeSlider(
      {super.key,
      this.initVolume = 100,
      this.extraOffsetX = 0,
      required this.child,
      required this.onVolumeChanged});

  String get pageName => "VolumeSlider";

  @override
  State<StatefulWidget> createState() {
    return _VolumeSliderState();
  }
}

class _VolumeSliderState extends State<VolumeSlider> {
  /// 音量调节控件高度
  double get _height => 180.s;

  /// 音量调节控件宽度
  double get _width => 30.s;
  OverlayEntry? _entry;
  int _volume = 100;

  /// 滑动时最后一次的音量值
  int _lastChangedVolume = 100;

  /// 当前是否移入target
  bool _isEnterTarget = false;

  @override
  Widget build(BuildContext context) {
    return MouseRegion(
        cursor: SystemMouseCursors.click,
        child: GestureDetector(
          onTap: onTap,
          child: widget.child,
        ));
  }

  @override
  void dispose() {
    super.dispose();
    if (_entry != null) {
      _entry?.remove();
      _entry = null;
    }
  }

  @override
  void initState() {
    super.initState();
    _volume = widget.initVolume;
    _lastChangedVolume = widget.initVolume;
  }

  /// 创建 Overlay 组件
  Widget _buildOverlay(Offset offset) {
    return Directionality(
      textDirection: Directionality.of(context),
      child: Positioned(
        left: offset.dx,
        bottom: offset.dy,
        child: Container(
          decoration: BoxDecoration(
            color: Colors.black.withOpacity(0.5),
            borderRadius: BorderRadius.circular(8.s),
          ),
          margin: EdgeInsets.only(bottom: 5.s),
          width: _width * 2,
          height: _height,
          child: StatefulSlider(
            initVolume: _volume,
            onVolumeChanged: (value) {
              setState(() {
                _volume = value;
              });
              widget.onVolumeChanged.call(_volume);
            },
            onVolumeChanging: (value) {
              if (value == _lastChangedVolume) return;
              _lastChangedVolume = value;
            },
          ),
        ),
      ),
    );
  }

  /// 创建新的 OverlayEntry
  void _createNewEntry() {
    final OverlayState overlayState = Overlay.of(
      context,
      debugRequiredFor: widget,
    );

    final RenderBox target = context.findRenderObject()! as RenderBox;
    final RenderBox targetConatiner =
        overlayState.context.findRenderObject() as RenderBox;
    final Offset targetOffset = target.localToGlobal(
      target.size.center(Offset.zero),
      ancestor: overlayState.context.findRenderObject(),
    );
    final Offset overlayOffset = Offset(
      targetOffset.dx - target.size.width + widget.extraOffsetX,
      targetConatiner.size.height - targetOffset.dy + target.size.height / 2,
    );
    final Widget overlay = _buildOverlay(overlayOffset);
    _entry = OverlayEntry(builder: (BuildContext context) => overlay);
    overlayState.insert(_entry!);
  }

  /// 隐藏 Tooltip
  void _hideTooltip() {
    _isEnterTarget = false;
    _hideTooltipLater();
  }

  /// 立即隐藏
  void _hideTooltipImmediately() {
    if (_entry == null) return;
    if (_entry!.mounted) {
      _entry?.remove();
      _entry = null;
    }
  }

  /// 稍后隐藏
  void _hideTooltipLater() {
    Future.delayed(const Duration(milliseconds: 500), () {
      if (_isEnterTarget) {
        _hideTooltipLater();
        return;
      }
      _preHandleWhenRemove();
      _hideTooltipImmediately();
    });
  }

  /// 提前移除的情况下预处理
  void _preHandleWhenRemove() {
    if (_lastChangedVolume != _volume) {
      setState(() {
        _volume = _lastChangedVolume;
      });
      widget.onVolumeChanged.call(_volume);
    }
  }

  /// 显示 Tooltip
  void _showTooltip() {
    _isEnterTarget = true;
    if (_entry != null) return;
    _createNewEntry();
  }

  void onTap() {
    if (_isEnterTarget) {
      _hideTooltip();
    } else {
      _showTooltip();
    }
  }
}

class StatefulSlider extends StatefulWidget {
  final ValueCallback<int> onVolumeChanged;
  final ValueCallback<int> onVolumeChanging;
  final int initVolume;
  const StatefulSlider(
      {super.key,
      required this.onVolumeChanged,
      required this.onVolumeChanging,
      required this.initVolume});

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

class _StatefulSliderState extends State<StatefulSlider> {
  int _volume = 100;

  @override
  Widget build(BuildContext context) {
    /// 音量调节文字高度
    double height = 30.s;
    double width = 30.s;
    return Column(
      children: [
        Expanded(
            child: RotatedBox(
          quarterTurns: 3,
          child: SliderTheme(
              data: SliderThemeData(
                  trackHeight: 5.s,
                  thumbShape: RoundSliderThumbShape(
                    enabledThumbRadius: 10.s,
                  ),
                  overlayShape: RoundSliderOverlayShape(overlayRadius: 24.s)),
              child: Slider(
                min: 0,
                max: 100,
                divisions: 100,
                value: _volume.toDouble(),
                onChanged: (value) {
                  widget.onVolumeChanging(value.toInt());
                  setState(() {
                    _volume = value.toInt();
                  });
                },
                onChangeEnd: (value) {
                  widget.onVolumeChanged.call(value.toInt());
                },
              )),
        )),
        SizedBox(
          width: width,
          height: height,
          child: Center(
              child: FISText(
            "$_volume",
            style: TextStyle(color: Colors.white, fontSize: 14.s),
          )),
        ),
      ],
    );
  }

  @override
  void initState() {
    super.initState();
    _volume = widget.initVolume;
  }

  @override
  void didUpdateWidget(StatefulSlider oldWidget) {
    super.didUpdateWidget(oldWidget);
    _volume = widget.initVolume;
  }
}