import 'package:fis_i18n/i18n.dart';
import 'package:fis_measure/interfaces/date_types/point.dart';
import 'package:fis_measure/interfaces/date_types/rect.dart';
import 'package:fis_measure/interfaces/date_types/rect_region.dart';
import 'package:fis_measure/interfaces/enums/items.dart';
import 'package:fis_measure/interfaces/process/items/item.dart';
import 'package:fis_measure/interfaces/process/workspace/application.dart';
import 'package:fis_measure/interfaces/process/workspace/point_info.dart';
import 'package:fis_measure/process/items/top_item.dart';
import 'package:fis_measure/process/workspace/measure_handler.dart';
import 'package:fis_measure/view/gesture/cross_position_indicator.dart';
import 'package:fis_ui/index.dart';
import 'package:flutter/gestures.dart';
import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:vid/us/vid_us_visual_area_type.dart';

import 'positioned_cursor.dart';

class MeasureMouseGesturePanel extends StatefulWidget {
  const MeasureMouseGesturePanel({Key? key}) : super(key: key);

  @override
  State<StatefulWidget> createState() => _MeasureMouseGesturePanelState();
}

class _MeasureMouseGesturePanelState extends State<MeasureMouseGesturePanel> {
  Offset? mousePosition;
  Offset? cursorPosition;

  final mouseState = Get.find<IMouseState>();
  late final application = Get.find<IApplication>();
  late final measureHandler = Get.find<MeasureHandler>();
  bool ifContainerTissueTM = false;
  CursorDisplayType displayType = CursorDisplayType.none;
  RectRegion tissueTMPixelRegion = RectRegion();
  bool isShowRightClickTip = false;
  late IMeasureItem? currMeasureItem;

  @override
  void initState() {
    _findMultiRegions();
    application.displaySizeChanged.addListener(_onResize);
    application.activeMeasureItemChanged
        .addListener(_onActiveMeasureItemChanged);
    currMeasureItem = application.activeMeasureItem;
    if (currMeasureItem != null) {
      currMeasureItem!.onItemStatesChanged.addListener(_onItemStatesChanged);
    }
    super.initState();
  }

  @override
  void dispose() {
    application.displaySizeChanged.removeListener(_onResize);
    application.activeMeasureItemChanged
        .removeListener(_onActiveMeasureItemChanged);
    if (currMeasureItem != null) {
      currMeasureItem!.onItemStatesChanged.removeListener(_onItemStatesChanged);
    }
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Listener(
      onPointerDown: _rightClickListener,
      child: GestureDetector(
        onTapDown: (details) {
          application.createPointInfo(
            details.localPosition,
            PointInfoType.mouseDown,
          );
        },
        onPanDown: (details) {
          // application.createPointInfo(
          //   details.localPosition,
          //   PointInfoType.mouseDown,
          // );
        },
        onPanUpdate: (details) {
          mouseState.mousePosition = details.localPosition;
          application.createPointInfo(
            details.localPosition,
            PointInfoType.mouseMove,
          );
        },
        child: MouseRegion(
          cursor: SystemMouseCursors.none,
          onHover: (event) {
            mouseState.mousePosition = event.localPosition;
            application.createPointInfo(
              event.localPosition,
              PointInfoType.mouseMove,
            );
            _handleAreaChange(event.localPosition);
          },
          onEnter: (e) {
            setState(() {
              displayType = CursorDisplayType.normal;
            });
          },
          onExit: (e) {
            setState(() {
              displayType = CursorDisplayType.none;
            });
          },
          child: Stack(
            children: [
              _buildCursor(),
              if (isShowRightClickTip && displayType != CursorDisplayType.none)
                _buildTip(),
            ],
          ),
        ),
      ),
    );
  }

  Widget _buildCursor() {
    switch (displayType) {
      case CursorDisplayType.none:
        return Container();
      case CursorDisplayType.normal:
        return const PositionedCursor();
      case CursorDisplayType.cross:
        return CrossIndicator(
          areaRegion: Rect.fromLTRB(
              tissueTMPixelRegion.left,
              tissueTMPixelRegion.top,
              tissueTMPixelRegion.right,
              tissueTMPixelRegion.bottom),
        );
    }
  }

  /// 右键右上角角标
  FWidget _buildTip() {
    return FPositioned(
      top: 0,
      right: 100,
      child: FContainer(
        height: 24,
        margin: const EdgeInsets.all(5),
        padding: const EdgeInsets.all(5),
        decoration: const BoxDecoration(
          color: Color.fromRGBO(71, 71, 71, 1),
          borderRadius: BorderRadius.all(Radius.circular(5)),
        ),
        child: FRow(children: [
          const FIcon(
            Icons.error_outline,
            color: Colors.white,
            size: 14,
          ),
          const FSizedBox(width: 5),
          FFittedBox(
            fit: BoxFit.fitHeight,
            child: FText(
              i18nBook.measure.rightClickToCancel.t,
              style: const TextStyle(
                  height: 1,
                  fontSize: 20,
                  color: Color.fromRGBO(213, 213, 213, 1)),
            ),
          ),
        ]),
      ),
    );
  }

  void _onResize(_, e) {
    _findMultiRegions();

    /// 延迟进行同步，避免窗口手动缩放时引发 Error: Build scheduled during frame.
    Future.delayed(const Duration(milliseconds: 1000), () {
      _setScaleRatio();
    });
  }

  /// 同步缩放比
  void _setScaleRatio() {
    mouseState.cursorScaleRatio = application.displayScaleRatio;
  }

  void _onActiveMeasureItemChanged(_, IMeasureItem? e) {
    if (e == null) return;
    if (currMeasureItem != null) {
      currMeasureItem!.onItemStatesChanged.removeListener(_onItemStatesChanged);
    }

    /// 组合测量项看成一个整体
    if (e is TopMeasureItem) {
      setState(() {
        isShowRightClickTip = true;
      });
    }
    currMeasureItem = e;
    currMeasureItem!.onItemStatesChanged.addListener(_onItemStatesChanged);
  }

  void _onItemStatesChanged(_, ItemStates? e) {
    if (e == ItemStates.running) {
      setState(() {
        isShowRightClickTip = true;
      });
    } else {
      setState(() {
        isShowRightClickTip = false;
      });
    }
  }

  void _handleAreaChange(Offset pointerOffset) {
    if (ifContainerTissueTM) {
      if (tissueTMPixelRegion
          .containsPoint(DPoint.parseOffset(pointerOffset))) {
        if (displayType != CursorDisplayType.cross) {
          setState(() {
            displayType = CursorDisplayType.cross;
          });
        }
      } else {
        if (displayType != CursorDisplayType.normal) {
          setState(() {
            displayType = CursorDisplayType.normal;
          });
        }
      }
    }
  }

  void _findMultiRegions() {
    final displaySize = application.displaySize;
    for (var visual in application.visuals) {
      for (var area in visual.visualAreas) {
        if (area.visualAreaType == VidUsVisualAreaType.TissueTimeMotion ||
            area.visualAreaType == VidUsVisualAreaType.Doppler) {
          ifContainerTissueTM = true;

          ///TODO 由于布局问题 Left 定位给不准，这里放宽到边界
          tissueTMPixelRegion = RectRegion.rect(DRect(
            // area.displayRegion.left * displaySize.width,
            0,
            area.displayRegion.top * displaySize.height,
            // area.displayRegion.width * displaySize.width,
            displaySize.width,
            area.displayRegion.height * displaySize.height,
          ));
        }
      }
    }
  }

  /// 鼠标右键监听
  void _rightClickListener(PointerDownEvent event) {
    if (event.kind == PointerDeviceKind.mouse &&
        event.buttons == kSecondaryMouseButton) {
      measureHandler.onRightClickFinishMeasure.emit(this, true);
      setState(() {
        isShowRightClickTip = false;
      });
    }
  }
}

enum CursorDisplayType {
  none,
  cross,
  normal,
}