import { computePosition } from '../../dom/dist/floating-ui.dom.js';
export { autoUpdate, platform } from '../../dom/dist/floating-ui.dom.js';
import * as React from 'react';
import { useLayoutEffect, useEffect } from 'react';
import * as ReactDOM from 'react-dom';
import { arrow as arrow$1 } from '../../core/dist/floating-ui.core.js';
export { detectOverflow, flip, hide, limitShift, offset, shift, size } from '../../core/dist/floating-ui.core.js';

/**
 * Provides data to position an inner element of the floating element so that it
 * appears centered to the reference element.
 * This wraps the core `arrow` middleware to allow React refs as the element.
 * @see https://floating-ui.com/docs/arrow
 */
const arrow = options => {
  function isRef(value) {
    return {}.hasOwnProperty.call(value, 'current');
  }
  return {
    name: 'arrow',
    options,
    fn(state) {
      const {
        element,
        padding
      } = typeof options === 'function' ? options(state) : options;
      if (element && isRef(element)) {
        if (element.current != null) {
          return arrow$1({
            element: element.current,
            padding
          }).fn(state);
        }
        return {};
      } else if (element) {
        return arrow$1({
          element,
          padding
        }).fn(state);
      }
      return {};
    }
  };
};

var index = typeof document !== 'undefined' ? useLayoutEffect : useEffect;

// Fork of `fast-deep-equal` that only does the comparisons we need and compares
// functions
function deepEqual(a, b) {
  if (a === b) {
    return true;
  }
  if (typeof a !== typeof b) {
    return false;
  }
  if (typeof a === 'function' && a.toString() === b.toString()) {
    return true;
  }
  let length, i, keys;
  if (a && b && typeof a == 'object') {
    if (Array.isArray(a)) {
      length = a.length;
      if (length != b.length) return false;
      for (i = length; i-- !== 0;) {
        if (!deepEqual(a[i], b[i])) {
          return false;
        }
      }
      return true;
    }
    keys = Object.keys(a);
    length = keys.length;
    if (length !== Object.keys(b).length) {
      return false;
    }
    for (i = length; i-- !== 0;) {
      if (!{}.hasOwnProperty.call(b, keys[i])) {
        return false;
      }
    }
    for (i = length; i-- !== 0;) {
      const key = keys[i];
      if (key === '_owner' && a.$$typeof) {
        continue;
      }
      if (!deepEqual(a[key], b[key])) {
        return false;
      }
    }
    return true;
  }
  return a !== a && b !== b;
}

function getDPR(element) {
  if (typeof window === 'undefined') {
    return 1;
  }
  const win = element.ownerDocument.defaultView || window;
  return win.devicePixelRatio || 1;
}

function roundByDPR(element, value) {
  const dpr = getDPR(element);
  return Math.round(value * dpr) / dpr;
}

function useLatestRef(value) {
  const ref = React.useRef(value);
  index(() => {
    ref.current = value;
  });
  return ref;
}

/**
 * Provides data to position a floating element.
 * @see https://floating-ui.com/docs/react
 */
function useFloating(options) {
  if (options === void 0) {
    options = {};
  }
  const {
    placement = 'bottom',
    strategy = 'absolute',
    middleware = [],
    platform,
    elements: {
      reference: externalReference,
      floating: externalFloating
    } = {},
    transform = true,
    whileElementsMounted,
    open
  } = options;
  const [data, setData] = React.useState({
    x: 0,
    y: 0,
    strategy,
    placement,
    middlewareData: {},
    isPositioned: false
  });
  const [latestMiddleware, setLatestMiddleware] = React.useState(middleware);
  if (!deepEqual(latestMiddleware, middleware)) {
    setLatestMiddleware(middleware);
  }
  const [_reference, _setReference] = React.useState(null);
  const [_floating, _setFloating] = React.useState(null);
  const setReference = React.useCallback(node => {
    if (node != referenceRef.current) {
      referenceRef.current = node;
      _setReference(node);
    }
  }, [_setReference]);
  const setFloating = React.useCallback(node => {
    if (node !== floatingRef.current) {
      floatingRef.current = node;
      _setFloating(node);
    }
  }, [_setFloating]);
  const referenceEl = externalReference || _reference;
  const floatingEl = externalFloating || _floating;
  const referenceRef = React.useRef(null);
  const floatingRef = React.useRef(null);
  const dataRef = React.useRef(data);
  const whileElementsMountedRef = useLatestRef(whileElementsMounted);
  const platformRef = useLatestRef(platform);
  const update = React.useCallback(() => {
    if (!referenceRef.current || !floatingRef.current) {
      return;
    }
    const config = {
      placement,
      strategy,
      middleware: latestMiddleware
    };
    if (platformRef.current) {
      config.platform = platformRef.current;
    }
    computePosition(referenceRef.current, floatingRef.current, config).then(data => {
      const fullData = {
        ...data,
        isPositioned: true
      };
      if (isMountedRef.current && !deepEqual(dataRef.current, fullData)) {
        dataRef.current = fullData;
        ReactDOM.flushSync(() => {
          setData(fullData);
        });
      }
    });
  }, [latestMiddleware, placement, strategy, platformRef]);
  index(() => {
    if (open === false && dataRef.current.isPositioned) {
      dataRef.current.isPositioned = false;
      setData(data => ({
        ...data,
        isPositioned: false
      }));
    }
  }, [open]);
  const isMountedRef = React.useRef(false);
  index(() => {
    isMountedRef.current = true;
    return () => {
      isMountedRef.current = false;
    };
  }, []);
  index(() => {
    if (referenceEl) referenceRef.current = referenceEl;
    if (floatingEl) floatingRef.current = floatingEl;
    if (referenceEl && floatingEl) {
      if (whileElementsMountedRef.current) {
        return whileElementsMountedRef.current(referenceEl, floatingEl, update);
      } else {
        update();
      }
    }
  }, [referenceEl, floatingEl, update, whileElementsMountedRef]);
  const refs = React.useMemo(() => ({
    reference: referenceRef,
    floating: floatingRef,
    setReference,
    setFloating
  }), [setReference, setFloating]);
  const elements = React.useMemo(() => ({
    reference: referenceEl,
    floating: floatingEl
  }), [referenceEl, floatingEl]);
  const floatingStyles = React.useMemo(() => {
    const initialStyles = {
      position: strategy,
      left: 0,
      top: 0
    };
    if (!elements.floating) {
      return initialStyles;
    }
    const x = roundByDPR(elements.floating, data.x);
    const y = roundByDPR(elements.floating, data.y);
    if (transform) {
      return {
        ...initialStyles,
        transform: "translate(" + x + "px, " + y + "px)",
        ...(getDPR(elements.floating) >= 1.5 && {
          willChange: 'transform'
        })
      };
    }
    return {
      position: strategy,
      left: x,
      top: y
    };
  }, [strategy, transform, elements.floating, data.x, data.y]);
  return React.useMemo(() => ({
    ...data,
    update,
    refs,
    elements,
    floatingStyles
  }), [data, update, refs, elements, floatingStyles]);
}

export { arrow, computePosition, useFloating };
//# sourceMappingURL=floating-ui.react-dom.js.map
