import { computed, reactive, ref, Ref, toRaw, watch, watchEffect } from "vue";
import { DC, EntityShape } from "../../deconstruction";
import { Shape } from "konva/lib/Shape";
import {
  globalWatch,
  installGlobalVar,
  usePointerIntersections,
  usePointerPos,
  useStage,
  useTransformIngShapes,
} from "./use-global-vars.ts";
import { useCan, useOperMode } from "./use-status";
import { Stage } from "konva/lib/Stage";
import { listener } from "../../utils/event.ts";
import { asyncTimeout, inRevise, mergeFuns } from "../../utils/shared.ts";
import { ComponentValue, DrawItem, ShapeType } from "../components";
import { shapeTreeContain, shapeTreeContains } from "../../utils/shape.ts";
import {
  usePointerIsTransformerInner,
  useTransformer,
} from "./use-transformer.ts";
import { KonvaEventObject } from "konva/lib/Node";
import { useStore } from "../store/index.ts";
import { Group } from "konva/lib/Group";
import { usePause } from "./use-pause.ts";
import { lineLen, Pos } from "@/utils/math.ts";
import { useFormalLayer } from "./use-layer.ts";

const stageHoverMap = new WeakMap<
  Stage,
  { result: Ref<EntityShape | undefined>; count: number; des: () => void }
>();
export const getHoverShape = (stage: Stage) => {
  let isStop = false;
  const stop = () => {
    if (isStop || !stageHoverMap.has(stage)) return;
    isStop = true;
    const data = stageHoverMap.get(stage)!;
    if (--data.count <= 0) {
      data.des();
    }
  };

  if (stageHoverMap.has(stage)) {
    const data = stageHoverMap.get(stage)!;
    ++data.count;
    return [data.result, stop] as const;
  }

  const hover = ref<EntityShape>();
  const enterHandler = (ev: KonvaEventObject<any, Stage>) => {
    const target = ev.target;
    hover.value = target;
    target.off(`pointerleave`, leaveHandler);
    target.on(`pointerleave`, leaveHandler as any);
  };

  const leaveHandler = (ev?: KonvaEventObject<any, Stage>) => {
    if (hover.value) {
      hover.value.off(`pointerleave`, leaveHandler);
      hover.value = undefined;
    }
  };

  stage.on(`pointerenter`, enterHandler);
  stageHoverMap.set(stage, {
    result: hover,
    count: 1,
    des: () => {
      stage.off(`pointerenter`, enterHandler);
      leaveHandler();
      stageHoverMap.delete(stage);
    },
  });
  return [hover, stop] as const;
};

export const useShapeClick = (
  shape: Ref<DC<Shape> | undefined>,
  fn: () => void
) => {
  const init = (shape: Shape) => {
    let downTime: number;
    let move = false;
    const downHandler = (ev: KonvaEventObject<any>) => {
      if (ev.evt.button === 0) {
        ev.cancelBubble = true
        downTime = Date.now();
        move = false;
      }
    };
    const moveHandler = (ev: KonvaEventObject<any>) => {
      ev.cancelBubble = true
      downTime = Date.now();
      move = true;
    };
    const upHandler = (ev: KonvaEventObject<any>) => {
      ev.cancelBubble = true
      if (Date.now() - downTime < 500 && !move) {
        fn();
      }
    };

    shape.on("pointerdown.click", downHandler);
    shape.on("pointermove.click", moveHandler);
    shape.on("pointerup.click", upHandler);
    return () => {
      shape.off("pointerdown.click", downHandler);
      shape.off("pointermove.click", moveHandler);
      shape.off("pointerup.click", upHandler);
    };
  };
  watch(shape, (shape, _, onCleanup) => {
    const $shape = shape?.getNode();
    $shape && onCleanup(init($shape));
  });
};

export const useShapeIsHover = (shape: Ref<DC<EntityShape> | undefined>) => {
  const stage = useStage();
  const store = useStore();
  const format = useFormalLayer();
  const pos = usePointerPos();

  const isHover = ref(false);
  const stop = watch(
    () => ({ stage: stage.value?.getNode(), shape: shape.value?.getNode() }),
    ({ stage, shape }, _, onCleanup) => {
      if (!stage || !shape || result.isPause) {
        isHover.value = false;
        return;
      }
      const forciblyCheck = async () => {
        await asyncTimeout(6)
        if (!pos.value || !format.value) {
          isHover.value = false;
          return;
        }
        isHover.value =
          format.value.getIntersection(pos.value) === toRaw(shape);
      };
      store.bus.on("addItemAfter", forciblyCheck);
      store.bus.on("setItemAfter", forciblyCheck);
      store.bus.on("delItemAfter", forciblyCheck);

      const [hoverShape, stopHoverListener] = getHoverShape(stage);
      watchEffect(() => {
        isHover.value = !!(
          hoverShape.value && shapeTreeContain([shape], toRaw(hoverShape.value))
        );
      });
      onCleanup(
        mergeFuns([
          stopHoverListener,
          () => {
            isHover.value = false;
            store.bus.off("addItemAfter", forciblyCheck);
            store.bus.off("setItemAfter", forciblyCheck);
            store.bus.off("delItemAfter", forciblyCheck);
          },
        ])
      );
    },
    { immediate: true }
  );
  const result = usePause([isHover, stop] as const);
  return result;
};

export const useMouseShapeIsHover = (
  shape: Ref<DC<EntityShape> | undefined>
) => {
  const stage = useStage();
  const hitShapes = usePointerIntersections();

  const isHover = ref(false);
  const stop = watch(
    () => ({ stage: stage.value?.getNode(), shape: shape.value?.getNode() }),
    ({ stage, shape }, _, onCleanup) => {
      if (!stage || !shape || result.isPause) {
        isHover.value = false;
        return;
      }

      const stopHoverListener = watch(hitShapes, () => {
        isHover.value = hitShapes.value.includes(shape as any);
      });
      onCleanup(mergeFuns([stopHoverListener, () => (isHover.value = false)]));
    },
    { immediate: true }
  );
  const result = usePause([isHover, stop] as const);
  return result;
};

export const useShapeIsTransformerInner = () => {
  const transformer = useTransformer();
  const pointerIsTransformerInner = usePointerIsTransformerInner();
  const stage = useStage();

  return (shape: EntityShape) => {
    const inner = ref(true);
    const $stage = stage.value!.getNode();
    const updateInner = () => {
      inner.value =
        transformer.isTransforming() ||
        (transformer.queueShapes.value.includes(shape) &&
          pointerIsTransformerInner());
    };

    const stop = watch(
      transformer.queueShapes,
      (_a, _, onCleanup) => {
        updateInner();
        if (inner.value) {
          $stage.on("pointermove", updateInner);
          onCleanup(() => {
            $stage.off("pointermove", updateInner);
          });
        }
      },
      { immediate: true, flush: "sync" }
    );

    return [inner, stop] as const;
  };
};

export const useMouseShapesStatus = installGlobalVar(() => {
  const can = useCan();
  const stage = useStage();
  const listeners = ref([]) as Ref<EntityShape[]>;
  const hovers = ref([]) as Ref<EntityShape[]>;
  const press = ref([]) as Ref<EntityShape[]>;
  const selects = ref([]) as Ref<EntityShape[]>;
  const actives = ref([]) as Ref<EntityShape[]>;
  const operMode = useOperMode();
  const pointerIsTransformerInner = usePointerIsTransformerInner();

  const init = (stage: Stage) => {
    const prevent = computed(() => operMode.value.freeView);
    const [hover, hoverDestory] = getHoverShape(stage);
    const hoverChange = () => {
      if (prevent.value) {
        return;
      }
      hovers.value = hover.value
        ? shapeTreeContains(listeners.value, hover.value)
        : [];
    };

    const stopHoverCheck = watch(
      () => [hover.value, prevent.value],
      hoverChange
    );
    let downTime: number;
    let downPos: Pos | null = null;
    let downTarget: EntityShape | null;
    stage.on("pointerdown.mouse-status", (ev) => {
      if (ev.evt.button !== 0) return;
      downPos = { x: ev.evt.pageX, y: ev.evt.pageY };
      downTime = Date.now();
      if (prevent.value) return;
      const target = shapeTreeContain(listeners.value, ev.target);
      if (target && !press.value.includes(target)) {
        press.value.push(target);
      }
      downTarget = target;
    });

    return mergeFuns(
      stopHoverCheck,
      hoverDestory,
      listener(
        stage.container().parentElement as HTMLDivElement,
        "pointerup",
        async (ev) => {
          if (ev.button !== 0) return;
          const target = downTarget;
          const moveDis = downPos
            ? lineLen(downPos!, { x: ev.pageX, y: ev.pageY })
            : 3;
          downPos = null;
          downTarget = null;
          const isMove = moveDis > 2;
          if (prevent.value) return;
          press.value = [];
          if (Date.now() - downTime > 300 || isMove) return;
          if (pointerIsTransformerInner()) return;
          if (ev.button !== 0) {
            // actives.value = [];
            // if (!operMode.value.mulSelection) {
            //   selects.value = [];
            // }
            return;
          }
          if (operMode.value.mulSelection) {
            if (!target) return;
            actives.value = [];
            const ndx = selects.value.findIndex(
              (item) => item.id() === target?.id()
            );
            if (~ndx) {
              selects.value.splice(ndx, 1);
            } else {
              selects.value.push(target!);
            }
            return;
          } else {
            selects.value = [];
            actives.value = target ? [target] : [];
          }
        }
      ),
      // listener(
      //   stage.container().parentElement as HTMLDivElement,
      //   "pointermove",
      //   async () => {
      //     if (prevent.value) return;
      //     if (downTarget && !operMode.value.mulSelection) {
      //       selects.value = [];
      //     }
      //   }
      // ),
      () => {
        listeners.value.forEach((shape) => {
          shape.off("pointerleave.mouse-status");
        });
        stage.off("pointerdown.mouse-status");
        hovers.value = [];
        actives.value = [];
        press.value = [];
        selects.value = [];
      }
    );
  };

  let cleanup: () => void;
  const stopStatusWatch = globalWatch(
    () => can.mouseReact,
    (current, prev) => {
      if (inRevise(prev, current)) {
        cleanup! && cleanup();
        if (current) {
          cleanup = init(stage.value!.getNode());
        }
      }
    },
    { immediate: true }
  );

  const pauseShapes = ref(new Set<EntityShape>());
  const getShapes = (shapes: Ref<EntityShape[]>) =>
    computed({
      get: () => {
        return shapes.value
          .filter((shape) => !pauseShapes.value.has(shape))
          .map(toRaw);
      },
      set: (val: EntityShape[]) => {
        shapes.value = val;
      },
    });
  const status = reactive({
    hovers: getShapes(hovers),
    actives: getShapes(actives),
    selects: getShapes(selects),
    press: getShapes(press),
    listeners,
    pause(shape: EntityShape) {
      pauseShapes.value.add(shape);
    },
    resume(shape: EntityShape) {
      pauseShapes.value.delete(shape);
    },
  });

  return {
    var: status,
    onDestroy: () => {
      stopStatusWatch();
      cleanup && cleanup();
    },
  };
}, Symbol("mouseStatus"));

export const useMouseShapeStatus = (
  shape: Ref<DC<EntityShape> | undefined>
) => {
  const status = useMouseShapesStatus();
  const shapeStatus = computed(() => {
    const $shape = shape.value?.getStage() as Shape;
    return {
      hover: status.hovers.includes($shape),
      active: status.actives.includes($shape),
      press: status.press.includes($shape),
      select: status.selects.includes($shape),
      pause: () =>
        shape.value?.getNode() && status.pause(shape.value?.getNode()),
      resume: () =>
        shape.value?.getNode() && status.resume(shape.value?.getNode()),
    };
  });

  watch(
    () => shape.value?.getStage(),
    (shape, _, onCleanup) => {
      if (shape) {
        if (status.listeners.includes(shape)) return;

        status.listeners.push(shape);
        onCleanup(() => {
          for (const key in status) {
            const k = key as keyof typeof status;
            if (Array.isArray(status[k])) {
              const ndx = status[k].indexOf(shape);
              ~ndx && status[k].splice(ndx, 1);
            }
          }
        });
      }
    },
    { immediate: true }
  );

  return shapeStatus;
};

export const useActiveItem = <T extends EntityShape>() => {
  const status = useMouseShapesStatus();
  const store = useStore();
  return computed(() => {
    if (!status.actives[0]) return;
    let shape = status.actives[0] as T;
    shape =
      ((shape as Group)?.findOne &&
        ((shape as Group)?.findOne(".repShape") as T)) ||
      shape;

    return {
      shape,
      item: store.getItemById(status.actives[0].id()),
    };
  });
};

type MouseStyleProps<T extends ShapeType> = {
  shape?: Ref<DC<EntityShape> | undefined>;
  getMouseStyle: (data: any) => Record<string, any>;
  data: Ref<DrawItem<T>>;
};
export const useMouseStyle = <T extends ShapeType>(
  props: MouseStyleProps<T>
) => {
  const shape = props.shape || ref();
  const status = useMouseShapeStatus(shape);
  const transformIngShapes = useTransformIngShapes();
  const mouseStyle = computed(() => {
    return props.getMouseStyle(props.data.value as any) as any;
  });

  const getStyle = () => {
    const styleMap = new Map([[mouseStyle.value.default, true]]);
    if ("hover" in mouseStyle.value) {
      styleMap.set(mouseStyle.value.hover, status.value.hover);
    }
    if ("press" in mouseStyle.value) {
      styleMap.set(mouseStyle.value.press, status.value.press);
    }
    if ("focus" in mouseStyle.value) {
      styleMap.set(mouseStyle.value.focus, status.value.active);
    }
    if (
      "drag" in mouseStyle.value &&
      transformIngShapes.value.includes(shape.value?.getNode()!)
    ) {
      styleMap.set(mouseStyle.value.drag, true);
    }
    if ("select" in mouseStyle.value) {
      styleMap.set(mouseStyle.value.select, status.value.select);
    }

    const finalStyle = {};
    for (const [style, use] of styleMap.entries()) {
      use && Object.assign(finalStyle as any, style);
    }
    return finalStyle;
  };
  const style = ref();
  watchEffect(() => {
    style.value = getStyle();
  });
  return { currentStyle: style, status, shape };
};

export const useAnimationMouseStyle = <T extends ShapeType>(
  props: MouseStyleProps<T>
) => {
  const { currentStyle, status } = useMouseStyle(props);
  // const [data, pauseAnimation, resumeAnimation] = useAniamtion(
  //   currentStyle as any
  // );
  return [
    currentStyle,
    () => {
      // pauseAnimation();
      status.value.pause();
    },
    () => {
      status.value.resume();
      // resumeAnimation();
    },
  ] as const;
};