import _defineProperty from '@babel/runtime/helpers/esm/defineProperty';
import { ref } from 'vue';
import { cloneDeep } from 'lodash-es';
import { useEventListener } from '@vueuse/core';
import { depx } from '../_util/utils';

function ownKeys(e, r) { var t = Object.keys(e); if (Object.getOwnPropertySymbols) { var o = Object.getOwnPropertySymbols(e); r && (o = o.filter(function (r) { return Object.getOwnPropertyDescriptor(e, r).enumerable; })), t.push.apply(t, o); } return t; }
function _objectSpread(e) { for (var r = 1; r < arguments.length; r++) { var t = null != arguments[r] ? arguments[r] : {}; r % 2 ? ownKeys(Object(t), !0).forEach(function (r) { _defineProperty(e, r, t[r]); }) : Object.getOwnPropertyDescriptors ? Object.defineProperties(e, Object.getOwnPropertyDescriptors(t)) : ownKeys(Object(t)).forEach(function (r) { Object.defineProperty(e, r, Object.getOwnPropertyDescriptor(t, r)); }); } return e; }
var useResize = (columns, widthMap, handleHeaderResize, isWatchX, isWidthAuto) => {
  const current = ref(null);
  let _widthMap = null;
  const onMousedown = (column, columnIndex, event) => {
    current.value = {
      id: column.id,
      clientX: event.clientX,
      columnIndex,
      width: depx(event.target.parentElement.offsetWidth)
    };
    _widthMap = cloneDeep(widthMap.value);
    isWatchX.value = false;
  };
  const onMousemove = event => {
    if (!current.value) {
      return;
    }
    if (!_widthMap) {
      return;
    }
    const currentClientX = event.clientX;
    const offset = currentClientX - current.value.clientX;
    if (!isWidthAuto.value) {
      const rightColumns = columns.slice(current.value.columnIndex + 1);
      widthMap.value[current.value.id].width = offset + _widthMap[current.value.id].width;
      rightColumns.forEach(col => {
        widthMap.value[col.id].width = -offset / rightColumns.length + _widthMap[col.id].width;
      });
    } else {
      widthMap.value[current.value.id] = _objectSpread(_objectSpread({}, _widthMap[current.value.id]), {}, {
        width: offset + current.value.width,
        minWidth: offset + current.value.width,
        maxWidth: offset + current.value.width
      });
    }
  };
  const onMouseup = event => {
    if (!current.value) {
      return;
    }

    // emit header resize event
    const currentColumnInstance = columns.find(c => c.id === current.value.id);
    if (!currentColumnInstance) {
      return;
    }
    handleHeaderResize({
      current: {
        prop: currentColumnInstance.props.prop,
        width: current.value.width,
        index: current.value.columnIndex
      },
      columns: columns.map((c, i) => {
        const width = widthMap.value[c.id].width;
        return {
          width,
          prop: c.props.prop,
          index: i
        };
      })
    }, event);

    // reset current
    current.value = null;
    _widthMap = null;
    isWatchX.value = true;
  };
  useEventListener(window.document, 'mousemove', onMousemove);
  useEventListener(window.document, 'mouseup', onMouseup);
  return {
    onMousedown,
    onMousemove,
    onMouseup,
    current
  };
};

export { useResize as default };
