import { installGlobalVar, useStage } from "./use-global-vars.ts";
import { useCan, useMode } from "./use-status";
import { DrawItem, ShapeType } from "../components";
import { nextTick, reactive, Ref, ref, watch, watchEffect } from "vue";
import { eqPoint, Pos } from "../../utils/math.ts";
import { clickListener, getOffset, listener } from "../../utils/event.ts";
import { mergeFuns } from "../../utils/shared.ts";
import { Mode } from "@/constant/mode.ts";
import { useMouseShapesStatus } from "./use-mouse-status.ts";
import { EntityShape } from "@/deconstruction.js";

export type InteractivePreset<T extends ShapeType = ShapeType> = {
  key?: string;
  type: T;
  callback?: () => void;
  preset?: Partial<DrawItem<T>> & { getMessages?: () => Pos[] | Area[] };
  operate?: {
    immediate?: boolean;
    single?: boolean;
    data?: any;
    preSelectIds?: string[];
  };
};
export const useInteractiveProps = installGlobalVar(() => {
  const props = ref<InteractivePreset | undefined>();
  return props;
}, Symbol("interactiveProps"));

export type Area = [Pos, Pos];
export type InteractiveHook =
  | typeof useInteractiveAreas
  | typeof useInteractiveDots;
export type InteractiveAreas = ReturnType<typeof useInteractiveAreas>;
export type InteractiveDots = ReturnType<typeof useInteractiveDots>;
export type Interactive = InteractiveAreas | InteractiveDots;

const useInteractiveExpose = <T extends object>(
  messages: Ref<T[]>,
  init: (dom: HTMLDivElement) => () => void,
  singleDone: Ref<boolean>,
  isRunning: Ref<boolean>,
  quit: () => void,
  autoConsumed?: boolean,
  attachInfos?: WeakMap<T, any>,
) => {
  const consumedMessages = reactive(new WeakSet<T>()) as WeakSet<T>;
  const stage = useStage();
  const interactiveProps = useInteractiveProps();

  watch(
    isRunning,
    (can, _, onCleanup) => {
      if (can) {
        const props = interactiveProps.value!;
        const cleanups = [] as Array<() => void>;
        if (props.operate?.single) {
          // 如果指定单次则消息中有信息，并且确定完成则马上退出
          cleanups.push(
            watchEffect(
              () => {
                if (messages.value.length > 0 && singleDone.value) {
                  quit();
                  props.callback && props.callback();
                }
              },
              { flush: "post" },
            ),
          );
        }

        // 单纯添加
        if (props.operate?.immediate) {
          messages.value.push(props.operate.data as T);
          singleDone.value = true;
        } else {
          const $stage = stage.value!.getStage();
          const dom = $stage.container();
          cleanups.push(init(dom));
          cleanups.push(() => {
            quit();
            props.callback && props.callback();
          });
        }
        onCleanup(mergeFuns(cleanups));
      } else {
        messages.value = [];
      }
    },
    { immediate: true },
  );

  return {
    attachInfos,
    isRunning,
    get preset() {
      return interactiveProps.value?.preset;
    },
    get messages() {
      const items = messages.value;
      const result = items.filter((item) => !consumedMessages.has(item));
      autoConsumed && result.forEach((item) => consumedMessages.add(item));
      return result as T[];
    },
    getNdx(item: T) {
      return messages.value.indexOf(item);
    },
    get consumedMessage() {
      const items = messages.value;
      return items.filter((item) => consumedMessages.has(item)) as T[];
    },
    consume(items: T[]) {
      items.forEach((item) => consumedMessages.add(item));
    },
    singleDone,
  };
};

type UseInteractiveProps = {
  isRuning: Ref<boolean>;
  quit: () => void;
  beforeHandler?: (p: Pos) => Pos;
  enter?: () => void;
  shapeType?: ShapeType;
  autoConsumed?: boolean;
};

export const useInteractiveAreas = ({
  isRuning,
  autoConsumed,
  beforeHandler,
  quit,
  enter,
}: UseInteractiveProps) => {
  const mode = useMode();
  const can = useCan();
  const singleDone = ref(true);
  const messages = ref<Area[]>([]);

  const init = (dom: HTMLDivElement) => {
    let pushed = false;
    let pushNdx = -1;
    let downed = false;
    let tempArea: Area;
    let dragging = false;
    enter && enter();

    const upHandler = (ev: MouseEvent) => {
      if (downed) {
        mode.del(Mode.draging);
      }
      downed = false;
      if (!dragging) return;

      if (can.dragMode) {
        const position = getOffset(ev, dom);
        messages.value[pushNdx]![1] = beforeHandler
          ? beforeHandler(position)
          : position;
      }

      prevEv = null;
      pushNdx = -1;
      pushed = false;
      downed = false;
      dragging = false;
      singleDone.value = true;
    };

    let prevEv: any;
    return mergeFuns(
      listener(dom, "pointerdown", (ev) => {
        if (!can.dragMode) return;
        const position = getOffset(ev, dom);
        if (ev.button === 0) {
          tempArea = [
            beforeHandler ? beforeHandler(position) : position,
          ] as unknown as Area;
          downed = true;
          singleDone.value = false;
          dragging = false;
          mode.add(Mode.draging);
        }
      }),
      listener(document.documentElement, "pointermove", (ev) => {
        if (!can.dragMode) return;
        if (ev.buttons <= 0) {
          prevEv && upHandler(prevEv);
          return;
        }
        const end = getOffset(ev, dom);
        const point = beforeHandler ? beforeHandler(end) : end;

        prevEv = ev;
        if (downed) {
          if (pushed) {
            messages.value[pushNdx]![1] = point;
          } else {
            tempArea[1] = point;
            pushed = true;
            pushNdx = messages.value.length;
            messages.value[pushNdx] = tempArea;
          }
          dragging = true;
        } else {
          tempArea = [point] as unknown as Area;
        }
      }),
      listener(document.documentElement, "pointerup", upHandler),
    );
  };

  return useInteractiveExpose(
    messages,
    init,
    singleDone,
    isRuning,
    quit,
    autoConsumed,
  );
};

export const useInteractiveDots = ({
  autoConsumed,
  isRuning,
  quit,
  enter,
  beforeHandler,
}: UseInteractiveProps) => {
  if (autoConsumed === void 0) autoConsumed = false;

  const interactiveProps = useInteractiveProps();
  const attachInfos = new WeakMap<Pos, any>();
  const mode = useMode();
  const can = useCan();
  const singleDone = ref(true);
  const messages = ref<Pos[]>([]);
  const stage = useStage();
  const shapesStatus = useMouseShapesStatus();

  const init = (dom: HTMLDivElement) => {
    if (!can.dragMode) return () => {};
    let moveIng = false;
    let pushed = false;
    const empty = { x: -9999, y: -9999 };
    const pointer = ref(empty);
    const beforePointer = ref(empty);
    enter && enter();
    mode.add(Mode.draging);

    const posMove = (position: Pos) => {
      if (!can.dragMode) return;
      if (!pushed) {
        messages.value.push(pointer.value);
        singleDone.value = false;
        pushed = true;
      }

      moveIng = true;
      const current = beforeHandler ? beforeHandler(position) : position;
      pointer.value.x = current.x;
      pointer.value.y = current.y;
      beforePointer.value = { ...position };
    };
    const move = (ev: MouseEvent) => {
      posMove(getOffset(ev));
    };
    const preSelectIds = interactiveProps.value?.operate?.preSelectIds;

    let prevPoint: Pos = { ...empty };
    const $stage = stage.value!.getNode();
    if (preSelectIds) {
      shapesStatus.actives = preSelectIds
        .map((id) => $stage.findOne(`#${id}`))
        .filter(Boolean) as EntityShape[];
    }

    return mergeFuns(
      () => {
        mode.del(Mode.draging);
        shapesStatus.actives = []
      },
      watch(singleDone, () => {
        if (singleDone.value) {
          prevPoint = pointer.value;
          const prevBeforePoint = beforePointer.value;
          pointer.value = { ...empty };
          beforePointer.value = { ...empty };
          singleDone.value = true;
          moveIng = false;
          pushed = false;
          nextTick(() => posMove(prevBeforePoint));
        }
      }),
      clickListener(dom, (_, ev) => {
        if (!moveIng || !can.dragMode || eqPoint(prevPoint, pointer.value))
          return;
        if (preSelectIds?.length && $stage) {
          const joinIds: string[] = [];
          for (const id of preSelectIds) {
            const $shape = $stage.findOne(`#${id}`);
            if (!$shape) continue;

            const rect = $shape.getClientRect();
            let x = ev.offsetX,
              y = ev.offsetY;
            if (
              x > rect.x &&
              x < rect.x + rect.width &&
              y > rect.y &&
              y < rect.y + rect.height
            ) {
              joinIds.push(id);
            }
          }
          if (joinIds.length) {
            attachInfos.set(pointer.value, joinIds);
            return;
          }
        }
        singleDone.value = true;
      }),
      listener(dom, "pointermove", move),
    );
  };

  return useInteractiveExpose(
    messages,
    init,
    singleDone,
    isRuning,
    quit,
    autoConsumed,
    attachInfos,
  );
};