import { lineVector, Pos, vectorAngle, verticalVector } from "@/utils/math.ts";
import { BaseItem, generateSnapInfos, getBaseItem } from "../util.ts";
import { getMouseColors } from "@/utils/colors.ts";
import { InteractiveFix, InteractiveTo, MatResponseProps } from "../index.ts";
import { inRevise, onlyId, rangMod } from "@/utils/shared.ts";
import { MathUtils } from "three";
import { DrawStore, useStore } from "@/core/store/index.ts";
import { getInitCtx, NLineDataCtx, normalLineData } from "./use-draw.ts";
import { SelectionManageBus, UseGetSelectionManage } from "@/core/hook/use-selection.ts";
import { EntityShape } from "@/deconstruction.js";
import mitt from "mitt";
import { watch } from "vue";

export { default as Component } from "./line.vue";
export { default as TempComponent } from "./temp-line.vue";
export { useDraw } from "./use-draw.ts";

export const shapeName = "线段";
export const defaultStyle = {
  stroke: "#000000",
  strokeWidth: 20,
  dash: [30, 0],
};

export const addMode = "single-dots";

export const getMouseStyle = (data: LineData) => {
  const strokeStatus = getMouseColors(data.stroke || defaultStyle.stroke);
  const strokeWidth = data.strokeWidth || defaultStyle.strokeWidth;
  return {
    default: { stroke: data.stroke || defaultStyle.stroke, strokeWidth },
    hover: { stroke: strokeStatus.hover },
    select: { stroke: strokeStatus.select },
    focus: { stroke: strokeStatus.hover },
    press: { stroke: strokeStatus.press },
  };
};

export const getSnapInfos = (data: LineData) => {
  const vh = generateSnapInfos(getSnapPoints(data), true, false, true);
  data.lines.forEach((item) => {
    const a = data.points.find((p) => p.id === item.a)!;
    const b = data.points.find((p) => p.id === item.b)!;
    const prevVector = lineVector([a, b]);
    const vLine = verticalVector(prevVector);

    vh.push({
      point: a,
      links: [b],
      linkDirections: [prevVector],
      linkAngle: [rangMod(MathUtils.radToDeg(vectorAngle(vLine)), 180)],
    });
  });
  return vh;
};

export const getSnapPoints = (data: LineData) => {
  return data.points;
};

export type LineData = Partial<typeof defaultStyle> &
  BaseItem & {
    points: (Pos & { id: string })[];
    lines: {
      id: string;
      a: string;
      b: string;
      strokeWidth: number;
      stroke: string;
      dash: number[];
    }[];
    polygon: { points: string[]; id: string }[];
    updateTime?: number;
    calcTime?: number;
  };

export const interactiveToData: InteractiveTo<"line"> = ({
  info,
  preset = {},
  ...args
}) => {
  if (info.cur) {
    const baseItem = getBaseItem();
    return interactiveFixData({
      ...args,
      info,
      data: {
        ...defaultStyle,
        ...baseItem,
        ...preset,
        lines: [],
        points: [],
        polygon: [],
      },
    });
  }
};

export const interactiveFixData: InteractiveFix<"line"> = ({ data, info }) => {
  const nv = [...info.consumed, info.cur!];

  data.points.length = nv.length;
  for (let i = 0; i < nv.length; i++) {
    if (inRevise(data.points[i], nv[i])) {
      if (!data.points[i]) {
        data.points[i] = {
          id: onlyId(),
          ...nv[i],
        };
      } else {
        data.points[i] = {
          ...data.points[i],
          ...nv[i],
        };
      }
    }
  }
  data.lines.length = nv.length - 1;
  for (let i = 0; i < nv.length - 1; i++) {
    if (!data.lines[i]) {
      data.lines[i] = {
        id: onlyId(),
        ...defaultStyle,
        a: data.points[i].id,
        b: data.points[i + 1].id,
      };
    }
  }

  // data.polygon = [{points: [data.lines.map((item) => item.id)], id: onlyId()}];
  return data;
};

const matResPoints = new Set<string>()
let matCtx: NLineDataCtx | null
let matData: LineData
export const startMatResponse = () => {
  matCtx = getInitCtx()
}

export const matResponse = ({
  data,
  mat,
  operId
}: MatResponseProps<"line">) => {
  matData = data
  const line =  data.lines.find(item => item.id === operId)
  if (!line) return;
  const ids = [line.a, line.b]
  for (const id of ids) {
    if (matResPoints.has(id)) {
      continue;
    }
    const ndx = data.points.findIndex(item => item.id === id)
    if (~ndx) {
      const point = data.points[ndx]
      data.points[ndx] = {
        ...point,
        ...mat.point(point)
      }
      matCtx!.update.points[point.id] = data.points[ndx]
      matResPoints.add(id)
    }
  }
  return data;
};

export const endMatResponse = () => {
  matResPoints.clear()
  // matCtx && normalLineData(matData, matCtx)
  // console.log(matData, matCtx)
  matCtx = null
}

export const getPredefine = (key: keyof LineData) => {
  if (key === "strokeWidth") {
    return { proportion: true };
  }
};

export const childrenDataGetter = (data: LineData, id: string) => {
  const line = data.lines.find(item => item.id === id)
  if (!line) return;

  const ids = [line.a, line.b]
  return data.points.filter(p => ids.includes(p.id))
}

export const delItem = (store: DrawStore, data: LineData, childId: string) => {
  if (!childId) {
    store.delItem("line", data.id);
    return;
  }

  let ndx;
  if (~(ndx = data.lines.findIndex((item) => item.id === childId))) {
    const delLine = data.lines[ndx];
    const ctx = getInitCtx();
    ctx.del.lines[delLine.id] = delLine;
    data.lines.splice(ndx, 1);
    normalLineData(data, ctx);
    store.setItem("line", { value: data, id: data.id });
  } else if (~(ndx = data.points.findIndex((item) => item.id === childId))) {
    const { ctx } = delPoint(data, childId);
    normalLineData(data, ctx);
    store.setItem("line", { value: data, id: data.id });
  }
};

export const delPoint = (data: LineData, id: string, ctx = getInitCtx()) => {
  const p = data.points.find((item) => item.id === id);
  if (!p) return { data, ctx };
  const checkLines = data.lines.filter(
    (item) => item.a === p.id || item.b === p.id
  );
  if (checkLines.length > 1) {
    const joinPoints = new Set<string>();
    checkLines.forEach((item) => {
      joinPoints.add(item.a);
      joinPoints.add(item.b);
    });

    if (joinPoints.size === 3) {
      const prev = checkLines.find((item) => item.b === p.id);
      const next = checkLines.find((item) => item.a === p.id);
      if (prev && next) {
        const l = { ...prev, id: onlyId(), b: next.b };
        ctx.add.lines[l.id] = l;
        data.lines.push(l);
      } else {
        const l = prev || next || checkLines[0];
        const ps = [...joinPoints].filter((item) => item !== p.id);
        const nl = { ...l, id: onlyId(), a: ps[0], b: ps[1] };
        ctx.add.lines[l.id] = nl;
        data.lines.push(nl);
      }
    }
  }
  checkLines.forEach((l) => {
    ctx.del.lines[l.id] = l;
    const ndx = data.lines.findIndex((ln) => ln.id === l.id);
    ~ndx && data.lines.splice(ndx, 1);
  });

  ctx.del.points[p.id] = p;
  const ndx = data.points.findIndex((pn) => pn.id === p.id);
  ~ndx && data.points.splice(ndx, 1);
  return { data, ctx };
};

export const useGetSelectionManage: UseGetSelectionManage = () => {
  const store = useStore();

  const canSelect = (shape: EntityShape) => {
    const id = shape.id();
    const line = store.getTypeItems('line')[0]
    return !!(id && line.lines.some(item => item.id === id));
  };
  const listener = (shape: EntityShape) => {
    const bus: SelectionManageBus = mitt();
    const stop = watch(
      () => canSelect(shape),
      (exixts, _) => {
        if (!exixts) {
          bus.emit("del", shape);
        }
      },
      { immediate: true }
    );
    return { stop, bus };
  };

  return { canSelect, listener };
};