import {
  MessageAction,
  penUpdatePoints,
  useDrawRunning,
  useInteractiveDrawShapeAPI,
  usePointBeforeHandler,
} from "@/core/hook/use-draw";
import { components, ComponentSnapInfo, SnapPoint } from "..";
import { useHistory, useHistoryAttach } from "@/core/hook/use-history";
import { useStore } from "@/core/store";
import { useViewerTransform } from "@/core/hook/use-viewer";
import { useOperMode } from "@/core/hook/use-status";
import { installGlobalVar, useCursor } from "@/core/hook/use-global-vars";
import { useInteractiveDots } from "@/core/hook/use-interactive";
import { computed, reactive, ref, watch } from "vue";
import { copy, mergeFuns } from "@/utils/shared";
import { eqPoint, Pos } from "@/utils/math";
import { getSnapInfos, type LineData } from "./";
import { useCustomSnapInfos } from "@/core/hook/use-snap";

type PayData = Pos;

export let initData: LineData | undefined;
export const useInitData = installGlobalVar(() => ref<LineData>());

// 单例钢笔添加
export const useDraw = () => {
  const type = "line";
  const { quitDrawShape } = useInteractiveDrawShapeAPI();
  const isRuning = useDrawRunning(type);
  const obj = components[type];
  const beforeHandler = usePointBeforeHandler(true, true);
  const history = useHistory();
  const store = useStore();
  const viewTransform = useViewerTransform();
  const operMode = useOperMode();
  const hInitData = useInitData();
  const customSnapInfos = useCustomSnapInfos();

  // 可能历史空间会撤销 重做更改到正在绘制的组件
  const currentCursor = ref("./icons/m_add.png");
  const cursor = useCursor();
  let cursorPop: ReturnType<typeof cursor.push> | null = null;
  let stopWatch: (() => void) | null = null;
  let prev: SnapPoint;
  let currentIsDel = false;
  let isTempDraw = false;
  let snapInfos: ComponentSnapInfo[] | null = null;
  let drawSnapInfos: ComponentSnapInfo[] | null = null;

  const ia = useInteractiveDots({
    shapeType: type,
    isRuning,
    enter() {
      cursorPop = cursor.push(currentCursor.value);
      watch(currentCursor, () => {
        cursorPop?.set(currentCursor.value);
      });
    },
    quit: () => {
      quitDrawShape();
      beforeHandler.clear();
      cursorPop && cursorPop();
      stopWatch && stopWatch();
      if (!drawItems[0]) return;

      if (isTempDraw) {
        console.log(drawItems[0].points)
        drawItems[0].lines.pop();
        drawItems[0].points.pop();
        drawItems[0].polygon.pop();
      }
      const lastP = drawItems[0].points[drawItems[0].points.length - 1]
      if (lastP) {
        console.log(lastP)
        const ctx = getInitCtx()
        ctx.add.points[lastP.id] = lastP
        normalLineData(drawItems[0], ctx)
      }
      

      snapInfos?.forEach(customSnapInfos.remove);
      drawSnapInfos?.forEach(customSnapInfos.remove);
      initData = hInitData.value = void 0;
    },
    beforeHandler: (p) => {
      beforeHandler.clear();
      const pa = beforeHandler.transform(p, prev && [prev, p]);
      currentIsDel && beforeHandler.clear();
      return pa;
    },
  });

  const shapeId = computed(
    () => ia.isRunning.value && store.getTypeItems(type)[0]?.id
  );
  const drawItems = reactive([]) as LineData[];
  watch(
    shapeId,
    () => {
      const data = shapeId.value
        ? (store.getItemById(shapeId.value) as LineData)
        : undefined;

      if (data) {
        initData = hInitData.value = {
          ...data,
          points: [...data.points],
          lines: [...data.lines],
          polygon: [...data.polygon],
        };
        drawItems[0] = {
          ...data,
          createTime: initData.createTime + 1,
          points: [],
          lines: [],
          polygon: [],
        };
        snapInfos = getSnapInfos(initData);
        snapInfos.forEach(customSnapInfos.add);
      } else {
        drawItems.pop();
        initData = hInitData.value = undefined;
      }
    },
    { immediate: true }
  );

  const messages = useHistoryAttach<Pos[]>(
    `${type}-pen`,
    isRuning,
    () => [],
    true
  );

  const getAddMessage = (cur: Pos) => {
    let consumed = messages.value;
    currentCursor.value = "./icons/m_add.png";
    let pen: null | ReturnType<typeof penUpdatePoints> = null;
    return {
      pen,
      consumed,
      cur,
      action: MessageAction.add,
    } as any;
  };

  const setMessage = (cur: Pos) => {
    const { pen, ...msg } = getAddMessage(cur);
    if ((currentIsDel = pen?.oper === "del")) {
      currentCursor.value = "./icons/m_reduce.png";
      beforeHandler.clear();
    }
    return msg;
  };

  const pushMessages = (cur: Pos) => {
    const { pen } = getAddMessage(cur);
    if (pen) {
      if (!pen.unchanged) {
        messages.value = pen.points;
        cur = pen.cur;
        messages.value.push(cur);
      }
    } else {
      messages.value.push(cur);
    }
    return !pen?.unchanged;
  };

  const addItem = (cur: PayData) => {
    if (!drawItems[0]) {
      const data = obj.interactiveToData({
        preset: ia.preset as any,
        info: setMessage(cur),
        viewTransform: viewTransform.value,
        history,
        store,
      });
      if (!data) {
        drawItems.pop();
        return;
      }
      if (initData?.id) {
        data.id = initData?.id;
      }
      drawItems[0] = reactive(data);
    }

    let prevItemIds: string[] = [];
    const storeAddItem = (cItem: LineData) => {
      drawSnapInfos?.forEach(customSnapInfos.remove);
      drawSnapInfos = getSnapInfos(cItem);
      const ctx = getInitCtx();
      cItem.points.forEach((p) => {
        if (!prevItemIds.includes(p.id)) {
          prevItemIds.push(p.id);
          ctx.add.points[p.id] = p;
        }
      });
      cItem.lines.forEach((l) => {
        if (!prevItemIds.includes(l.id)) {
          prevItemIds.push(l.id);
          ctx.add.lines[l.id] = l;
        }
      });

      if (initData) {
        cItem = {
          ...cItem,
          points: [...initData.points, ...cItem.points],
          lines: [...initData.lines, ...cItem.lines],
          polygon: [...initData.polygon, ...cItem.polygon],
        };
      } else {
        cItem = {
          ...cItem,
          points: [...cItem.points],
          lines: [...cItem.lines],
          polygon: [...cItem.polygon],
        };
      }
      cItem = normalLineData(cItem, ctx);
      drawSnapInfos.forEach(customSnapInfos.add);
      if (drawItems[0] && store.getItemById(drawItems[0].id)) {
        store.setItem(type, { id: cItem.id, value: cItem });
      } else {
        store.addItem(type, cItem);
      }
    };

    if (ia.singleDone.value) {
      storeAddItem(drawItems[0]);
      return;
    }

    const update = () => {
      const msg = setMessage(cur);
      drawItems[0] = obj.interactiveFixData({
        data: drawItems[0]!,
        info: msg,
        viewTransform: viewTransform.value,
        history,
        store,
      });
      isTempDraw = true;
    };

    stopWatch = mergeFuns(
      watch(() => operMode.value.freeDraw, update),
      watch(cur, update, { immediate: true, deep: true }),
      watch(
        messages,
        () => {
          if (!messages.value) return;
          if (messages.value.length === 0) {
            quitDrawShape();
          } else {
            update();
          }
        },
        { deep: true }
      ),
      // 监听是否消费完毕
      watch(ia.singleDone, () => {
        prev = { ...cur, view: true };
        const isChange = pushMessages(cur);
        if (isChange) {
          storeAddItem(copy(drawItems[0]));
        }
        beforeHandler.clear();
        stopWatch && stopWatch();
        stopWatch = null;
        isTempDraw = false;
      })
    );
  };

  // 每次拽结束都加组件
  watch(
    () => ia.messages,
    (datas: any) => {
      datas.forEach(addItem);
      ia.consume(datas);
    },
    { immediate: true }
  );

  return drawItems;
};




export type NLineDataCtx = {
  del: {
    points: Record<string, LineData["points"][0]>;
    lines: Record<string, LineData["lines"][0]>;
  };
  add: {
    points: Record<string, LineData["points"][0]>;
    lines: Record<string, LineData["lines"][0]>;
  };
  update: {
    points: Record<string, LineData["points"][0]>;
    lines: Record<string, LineData["lines"][0]>;
  };
};
export const getInitCtx = (): NLineDataCtx => ({
  del: {
    points: {},
    lines: {},
  },
  add: {
    points: {},
    lines: {},
  },
  update: {
    points: {},
    lines: {},
  },
});

export const repPointRef = (data: LineData, delId: string, repId: string) => {
  for (let i = 0; i < data.lines.length; i++) {
    const line = data.lines[i];
    if (line.a === delId) {
      data.lines[i] = { ...line, a: repId };
    }
    if (line.b === delId) {
      data.lines[i] = { ...line, b: repId };
    }
  }
  return data
};

export const deduplicateLines = (data: LineData) => {
  const seen = new Map<string, LineData['lines'][0]>();
  let isChange = false
  for (const line of data.lines) {
    if (line.a === line.b) continue;
    // 生成标准化键：确保 (a,b) 和 (b,a) 被视为相同，并且 a === b 时也去重
    const key1 = `${line.a},${line.b}`;
    const key2 = `${line.b},${line.a}`;

    // 检查是否已存在相同键
    const existingKey = seen.has(key1) ? key1 : seen.has(key2) ? key2 : null;

    if (existingKey) {
      // 如果存在重复键，覆盖旧值（保留尾部元素）
      seen.delete(existingKey);
      seen.set(key1, line); // 统一存储为 key1 格式
      isChange = true
    } else {
      // 新记录，直接存储
      seen.set(key1, line);
    }
  }
  if (isChange) {
    data.lines = Array.from(seen.values())
  }

  return data
};

export const normalLineData = (data: LineData, ctx: NLineDataCtx) => {
  const changePoints = [
    ...Object.values(ctx.add.points),
    ...Object.values(ctx.update.points),
  ];

  for (const p2 of changePoints) {
    const ndx = data.points.findIndex((item) => item.id === p2.id);
    if (!~ndx) continue;

    for (let i = 0; i < data.points.length; i++) {
      const p1 = data.points[i];
      if (p1.id !== p2.id && eqPoint(p1, p2)) {
        repPointRef(data, p1.id, p2.id);
        data.points.splice(i, 1);
        i--;
      }
    }
  }

  const pointIds = Object.values(ctx.del.lines).flatMap(item => [item.a, item.b])
  pointIds.push(...Object.keys(ctx.add.points))
  const linePointIds = data.lines.flatMap(item => [item.a, item.b])
  for (let id of pointIds) {
    if (!linePointIds.includes(id)) {
      const ndx = data.points.findIndex(p => p.id === id)
      ~ndx && data.points.splice(ndx, 1)
    }
  }

  return deduplicateLines(data);
};