import React from 'react';
import {
  Drawer,
  DrawerPanelContent,
  DrawerContent,
  DrawerContentBody,
  DrawerHead,
  DrawerActions,
  DrawerCloseButton,
  Button
} from '@patternfly/react-core';

export const DrawerFocusTrap: React.FunctionComponent = () => {
  const [isExpanded, setIsExpanded] = React.useState(false);

  const onClick = () => {
    setIsExpanded(!isExpanded);
  };

  const onCloseClick = () => {
    setIsExpanded(false);
  };

  // An onKeyDown property must be passed to the Drawer component to handle closing
  // the drawer panel and deactivating the focus trap via the Escape key.
  const onEscape = (event: React.KeyboardEvent) => {
    if (event.key === 'Escape') {
      setIsExpanded(false);
    }
  };

  const panelContent = (
    <DrawerPanelContent focusTrap={{ enabled: true }}>
      <DrawerHead>
        <span>drawer-panel</span>
        <DrawerActions>
          <DrawerCloseButton onClick={onCloseClick} />
        </DrawerActions>
      </DrawerHead>
    </DrawerPanelContent>
  );

  const drawerContent =
    'Lorem ipsum dolor sit amet, consectetur adipiscing elit. Phasellus pretium est a porttitor vehicula. Quisque vel commodo urna. Morbi mattis rutrum ante, id vehicula ex accumsan ut. Morbi viverra, eros vel porttitor facilisis, eros purus aliquet erat,nec lobortis felis elit pulvinar sem. Vivamus vulputate, risus eget commodo eleifend, eros nibh porta quam, vitae lacinia leo libero at magna. Maecenas aliquam sagittis orci, et posuere nisi ultrices sit amet. Aliquam ex odio, malesuada sed posuere quis, pellentesque at mauris. Phasellus venenatis massa ex, eget pulvinar libero auctor pretium. Aliquam erat volutpat. Duis euismod justo in quam ullamcorper, in commodo massa vulputate.';

  return (
    <React.Fragment>
      <Button aria-expanded={isExpanded} onClick={onClick}>
        Toggle drawer with focus trap
      </Button>
      <Drawer onKeyDown={onEscape} isExpanded={isExpanded}>
        <DrawerContent panelContent={panelContent}>
          <DrawerContentBody>{drawerContent}</DrawerContentBody>
        </DrawerContent>
      </Drawer>
    </React.Fragment>
  );
};