text: import React from 'react';
  import PropTypes from 'prop-types';
  import ReactDOM from 'react-dom';
  import warning from 'warning';
  import debounce from '../utils/debounce';
  import clsx from 'clsx';
  import { chainPropTypes, elementTypeAcceptingRef } from '@material-ui/utils';
  import ownerDocument from '../utils/ownerDocument';
  import ownerWindow from '../utils/ownerWindow';
  import { createChainedFunction } from '../utils/helpers';
  import withStyles from '../styles/withStyles';
  import Modal from '../Modal';
  import Grow from '../Grow';
  import Paper from '../Paper';
  
  export function getOffsetTop(rect, vertical) {
    let offset = 0;
  
    if (typeof vertical === 'number') {
      offset = vertical;
    } else if (vertical === 'center') {
      offset = rect.height / 2;
    } else if (vertical === 'bottom') {
      offset = rect.height;
    }
  
    return offset;
  }
  
  export function getOffsetLeft(rect, horizontal) {
    let offset = 0;
  
    if (typeof horizontal === 'number') {
      offset = horizontal;
    } else if (horizontal === 'center') {
      offset = rect.width / 2;
    } else if (horizontal === 'right') {
      offset = rect.width;
    }
  
    return offset;
  }
  
  function getTransformOriginValue(transformOrigin) {
    return [transformOrigin.horizontal, transformOrigin.vertical]
      .map(n => (typeof n === 'number' ? `${n}px` : n))
      .join(' ');
  }
  
  // Sum the scrollTop between two elements.
  function getScrollParent(parent, child) {
    let element = child;
    let scrollTop = 0;
  
    while (element && element !== parent) {
      element = element.parentNode;
      scrollTop += element.scrollTop;
    }
    return scrollTop;
  }
  
  function getAnchorEl(anchorEl) {
    return typeof anchorEl === 'function' ? anchorEl() : anchorEl;
  }
  
  export const styles = {
    /* Styles applied to the `Paper` component. */
    paper: {
      position: 'absolute',
      overflowY: 'auto',
      overflowX: 'hidden',
      // So we see the popover when it's empty.
      // It's most likely on issue on userland.
      minWidth: 16,
      minHeight: 16,
      maxWidth: 'calc(100% - 32px)',
      maxHeight: 'calc(100% - 32px)',
      // We disable the focus ring for mouse, touch and keyboard users.
      outline: 'none',
    },
  };
  
  const Popover = React.forwardRef(function Popover(props, ref) {
    const {
      action,
      anchorEl,
      anchorOrigin = {
        vertical: 'top',
        horizontal: 'left',
      },
      anchorPosition,
      anchorReference = 'anchorEl',
      children,
      classes,
      container: containerProp,
      elevation = 8,
      getContentAnchorEl,
      marginThreshold = 16,
      ModalClasses,
      onEnter,
      onEntered,
      onEntering,
      onExit,
      onExited,
      onExiting,
      open,
      PaperProps = {},
      transformOrigin = {
        vertical: 'top',
        horizontal: 'left',
      },
      TransitionComponent = Grow,
      transitionDuration: transitionDurationProp = 'auto',
      TransitionProps = {},
      ...other
    } = props;
    const paperRef = React.useRef();
    const handleResizeRef = React.useRef(() => {});
  
    React.useImperativeHandle(
      action,
      () => ({
        updatePosition: handleResizeRef.current,
      }),
      [],
    );
  
    // Returns the top/left offset of the position
    // to attach to on the anchor element (or body if none is provided)
    const getAnchorOffset = React.useCallback(
      contentAnchorOffset => {
        if (anchorReference === 'anchorPosition') {
          warning(
            anchorPosition,
            'Material-UI: you need to provide a `anchorPosition` prop when using ' +
              '<Popover anchorReference="anchorPosition" />.',
          );
          return anchorPosition;
        }
  
        const resolvedAnchorEl = getAnchorEl(anchorEl);
        // If an anchor element wasn't provided, just use the parent body element of this Popover
        const anchorElement =
          resolvedAnchorEl instanceof Element
            ? resolvedAnchorEl
            : ownerDocument(paperRef.current).body;
        const anchorRect = anchorElement.getBoundingClientRect();
        const anchorVertical = contentAnchorOffset === 0 ? anchorOrigin.vertical : 'center';
  
        return {
          top: anchorRect.top + getOffsetTop(anchorRect, anchorVertical),
          left: anchorRect.left + getOffsetLeft(anchorRect, anchorOrigin.horizontal),
        };
      },
      [anchorEl, anchorOrigin.horizontal, anchorOrigin.vertical, anchorPosition, anchorReference],
    );
  
    // Returns the vertical offset of inner content to anchor the transform on if provided
    const getContentAnchorOffset = React.useCallback(
      element => {
        let contentAnchorOffset = 0;
  
        if (getContentAnchorEl && anchorReference === 'anchorEl') {
          const contentAnchorEl = getContentAnchorEl(element);
  
          if (contentAnchorEl && element.contains(contentAnchorEl)) {
            const scrollTop = getScrollParent(element, contentAnchorEl);
            contentAnchorOffset =
              contentAnchorEl.offsetTop + contentAnchorEl.clientHeight / 2 - scrollTop || 0;
          }
  
          // != the default value
          warning(
            anchorOrigin.vertical === 'top',
            [
              'Material-UI: you can not change the default `anchorOrigin.vertical` value ',
              'when also providing the `getContentAnchorEl` prop to the popover component.',
              'Only use one of the two properties.',
              'Set `getContentAnchorEl` to `null | undefined`' +
                ' or leave `anchorOrigin.vertical` unchanged.',
            ].join('\n'),
          );
        }
  
        return contentAnchorOffset;
      },
      [anchorOrigin.vertical, anchorReference, getContentAnchorEl],
    );
  
    // Return the base transform origin using the element
    // and taking the content anchor offset into account if in use
    const getTransformOrigin = React.useCallback(
      (elemRect, contentAnchorOffset = 0) => {
        return {
          vertical: getOffsetTop(elemRect, transformOrigin.vertical) + contentAnchorOffset,
          horizontal: getOffsetLeft(elemRect, transformOrigin.horizontal),
        };
      },
      [transformOrigin.horizontal, transformOrigin.vertical],
    );
  
    const getPositioningStyle = React.useCallback(
      element => {
        // Check if the parent has requested anchoring on an inner content node
        const contentAnchorOffset = getContentAnchorOffset(element);
        const elemRect = {
          width: element.offsetWidth,
          height: element.offsetHeight,
        };
  
        // Get the transform origin point on the element itself
        const elemTransformOrigin = getTransformOrigin(elemRect, contentAnchorOffset);
  
        if (anchorReference === 'none') {
          return {
            top: null,
            left: null,
            transformOrigin: getTransformOriginValue(elemTransformOrigin),
          };
        }
  
        // Get the offset of of the anchoring element
        const anchorOffset = getAnchorOffset(contentAnchorOffset);
  
        // Calculate element positioning
        let top = anchorOffset.top - elemTransformOrigin.vertical;
        let left = anchorOffset.left - elemTransformOrigin.horizontal;
        const bottom = top + elemRect.height;
        const right = left + elemRect.width;
  
        // Use the parent window of the anchorEl if provided
        const containerWindow = ownerWindow(getAnchorEl(anchorEl));
  
        // Window thresholds taking required margin into account
        const heightThreshold = containerWindow.innerHeight - marginThreshold;
        const widthThreshold = containerWindow.innerWidth - marginThreshold;
  
        // Check if the vertical axis needs shifting
        if (top < marginThreshold) {
          const diff = top - marginThreshold;
          top -= diff;
          elemTransformOrigin.vertical += diff;
        } else if (bottom > heightThreshold) {
          const diff = bottom - heightThreshold;
          top -= diff;
          elemTransformOrigin.vertical += diff;
        }
  
        warning(
          elemRect.height <= heightThreshold || !elemRect.height || !heightThreshold,
          [
            'Material-UI: the popover component is too tall.',
            `Some part of it can not be seen on the screen (${elemRect.height - heightThreshold}px).`,
            'Please consider adding a `max-height` to improve the user-experience.',
          ].join('\n'),
        );
  
        // Check if the horizontal axis needs shifting
        if (left < marginThreshold) {
          const diff = left - marginThreshold;
          left -= diff;
          elemTransformOrigin.horizontal += diff;
        } else if (right > widthThreshold) {
          const diff = right - widthThreshold;
          left -= diff;
          elemTransformOrigin.horizontal += diff;
        }
  
        return {
          top: `${top}px`,
          left: `${left}px`,
          transformOrigin: getTransformOriginValue(elemTransformOrigin),
        };
      },
      [
        anchorEl,
        anchorReference,
        getAnchorOffset,
        getContentAnchorOffset,
        getTransformOrigin,
        marginThreshold,
      ],
    );
  
    const setPositioningStyles = React.useCallback(
      element => {
        const positioning = getPositioningStyle(element);
  
        if (positioning.top !== null) {
          element.style.top = positioning.top;
        }
        if (positioning.left !== null) {
          element.style.left = positioning.left;
        }
        element.style.transformOrigin = positioning.transformOrigin;
      },
      [getPositioningStyle],
    );
  
    const handleEntering = element => {
      if (onEntering) {
        onEntering(element);
      }
  
      setPositioningStyles(element);
    };
  
    const handlePaperRef = React.useCallback(instance => {
      // #StrictMode ready
      paperRef.current = ReactDOM.findDOMNode(instance);
    }, []);
  
    React.useEffect(() => {
      handleResizeRef.current = debounce(() => {
        // Because we debounce the event, the open prop might no longer be true
        // when the callback resolves.
        if (!open) {
          return;
        }
  
        setPositioningStyles(paperRef.current);
      });
      window.addEventListener('resize', handleResizeRef.current);
      return () => {
        handleResizeRef.current.clear();
        window.removeEventListener('resize', handleResizeRef.current);
      };
    }, [open, setPositioningStyles]);
  
    let transitionDuration = transitionDurationProp;
  
    if (transitionDurationProp === 'auto' && !TransitionComponent.muiSupportAuto) {
      transitionDuration = undefined;
    }
  
    // If the container prop is provided, use that
    // If the anchorEl prop is provided, use its parent body element as the container
    // If neither are provided let the Modal take care of choosing the container
    const container =
      containerProp || (anchorEl ? ownerDocument(getAnchorEl(anchorEl)).body : undefined);
  
    return (
      <Modal
        classes={ModalClasses}
        container={container}
        open={open}
        ref={ref}
        BackdropProps={{ invisible: true }}
        {...other}
      >
        <TransitionComponent
          appear
          in={open}
          onEnter={onEnter}
          onEntered={onEntered}
          onExit={onExit}
          onExited={onExited}
          onExiting={onExiting}
          timeout={transitionDuration}
          {...TransitionProps}
          onEntering={createChainedFunction(handleEntering, TransitionProps.onEntering)}
        >
          <Paper
            data-mui-test="Popover"
            elevation={elevation}
            ref={handlePaperRef}
            {...PaperProps}
            className={clsx(classes.paper, PaperProps.className)}
          >
            {children}
          </Paper>
        </TransitionComponent>
      </Modal>
    );
  });
  
  Popover.propTypes = {
    /**
     * This is callback prop. It's called by the component on mount.
     * This is useful when you want to trigger an action programmatically.
     * It currently only supports updatePosition() action.
     *
     * @param {object} actions This object contains all possible actions
     * that can be triggered programmatically.
     */
    action: PropTypes.func,
    /**
     * This is the DOM element, or a function that returns the DOM element,
     * that may be used to set the position of the popover.
     */
    anchorEl: chainPropTypes(PropTypes.oneOfType([PropTypes.object, PropTypes.func]), props => {
      if (props.open && (!props.anchorReference || props.anchorReference === 'anchorEl')) {
        const resolvedAnchorEl = getAnchorEl(props.anchorEl);
  
        if (resolvedAnchorEl instanceof Element) {
          const box = resolvedAnchorEl.getBoundingClientRect();
  
          if (
            process.env.NODE_ENV !== 'test' &&
            box.top === 0 &&
            box.left === 0 &&
            box.right === 0 &&
            box.bottom === 0
          ) {
            return new Error(
              [
                'Material-UI: the `anchorEl` prop provided to the component is invalid.',
                'The node element should be visible.',
              ].join('\n'),
            );
          }
        } else {
          return new Error(
            [
              'Material-UI: the `anchorEl` prop provided to the component is invalid.',
              `It should be an Element instance but it's \`${resolvedAnchorEl}\` instead.`,
            ].join('\n'),
          );
        }
      }
  
      return null;
    }),
    /**
     * This is the point on the anchor where the popover's
     * `anchorEl` will attach to. This is not used when the
     * anchorReference is 'anchorPosition'.
     *
     * Options:
     * vertical: [top, center, bottom];
     * horizontal: [left, center, right].
     */
    anchorOrigin: PropTypes.shape({
      horizontal: PropTypes.oneOfType([
        PropTypes.number,
        PropTypes.oneOf(['left', 'center', 'right']),
      ]).isRequired,
      vertical: PropTypes.oneOfType([PropTypes.number, PropTypes.oneOf(['top', 'center', 'bottom'])])
        .isRequired,
    }),
    /**
     * This is the position that may be used
     * to set the position of the popover.
     * The coordinates are relative to
     * the application's client area.
     */
    anchorPosition: PropTypes.shape({
      left: PropTypes.number.isRequired,
      top: PropTypes.number.isRequired,
    }),
    /*
     * This determines which anchor prop to refer to to set
     * the position of the popover.
     */
    anchorReference: PropTypes.oneOf(['anchorEl', 'anchorPosition', 'none']),
    /**
     * The content of the component.
     */
    children: PropTypes.node,
    /**
     * Override or extend the styles applied to the component.
     * See [CSS API](#css) below for more details.
     */
    classes: PropTypes.object.isRequired,
    /**
     * A node, component instance, or function that returns either.
     * The `container` will passed to the Modal component.
     * By default, it uses the body of the anchorEl's top-level document object,
     * so it's simply `document.body` most of the time.
     */
    container: PropTypes.oneOfType([PropTypes.object, PropTypes.func]),
    /**
     * The elevation of the popover.
     */
    elevation: PropTypes.number,
    /**
     * This function is called in order to retrieve the content anchor element.
     * It's the opposite of the `anchorEl` prop.
     * The content anchor element should be an element inside the popover.
     * It's used to correctly scroll and set the position of the popover.
     * The positioning strategy tries to make the content anchor element just above the
     * anchor element.
     */
    getContentAnchorEl: PropTypes.func,
    /**
     * Specifies how close to the edge of the window the popover can appear.
     */
    marginThreshold: PropTypes.number,
    /**
     * `classes` prop applied to the [`Modal`](/api/modal/) element.
     */
    ModalClasses: PropTypes.object,
    /**
     * Callback fired when the component requests to be closed.
     *
     * @param {object} event The event source of the callback.
     * @param {string} reason Can be:`"escapeKeyDown"`, `"backdropClick"`
     */
    onClose: PropTypes.func,
    /**
     * Callback fired before the component is entering.
     */
    onEnter: PropTypes.func,
    /**
     * Callback fired when the component has entered.
     */
    onEntered: PropTypes.func,
    /**
     * Callback fired when the component is entering.
     */
    onEntering: PropTypes.func,
    /**
     * Callback fired before the component is exiting.
     */
    onExit: PropTypes.func,
    /**
     * Callback fired when the component has exited.
     */
    onExited: PropTypes.func,
    /**
     * Callback fired when the component is exiting.
     */
    onExiting: PropTypes.func,
    /**
     * If `true`, the popover is visible.
     */
    open: PropTypes.bool.isRequired,
    /**
     * Properties applied to the [`Paper`](/api/paper/) element.
     */
    PaperProps: PropTypes.shape({
      component: elementTypeAcceptingRef,
    }),
    /**
     * This is the point on the popover which
     * will attach to the anchor's origin.
     *
     * Options:
     * vertical: [top, center, bottom, x(px)];
     * horizontal: [left, center, right, x(px)].
     */
    transformOrigin: PropTypes.shape({
      horizontal: PropTypes.oneOfType([
        PropTypes.number,
        PropTypes.oneOf(['left', 'center', 'right']),
      ]).isRequired,
      vertical: PropTypes.oneOfType([PropTypes.number, PropTypes.oneOf(['top', 'center', 'bottom'])])
        .isRequired,
    }),
    /**
     * The component used for the transition.
     */
    TransitionComponent: PropTypes.elementType,
    /**
     * Set to 'auto' to automatically calculate transition time based on height.
     */
    transitionDuration: PropTypes.oneOfType([
      PropTypes.number,
      PropTypes.shape({ enter: PropTypes.number, exit: PropTypes.number }),
      PropTypes.oneOf(['auto']),
    ]),
    /**
     * Properties applied to the `Transition` element.
     */
    TransitionProps: PropTypes.object,
  };
  
  export default withStyles(styles, { name: 'MuiPopover' })(Popover);
  