// @flow strict

import * as React from 'react';
import {
  // $FlowFixMe[untyped-import]
  autoUpdate,
  // $FlowFixMe[untyped-import]
  flip,
  // $FlowFixMe[untyped-import]
  FloatingFocusManager,
  // $FlowFixMe[untyped-import]
  FloatingPortal,
  // $FlowFixMe[untyped-import]
  offset,
  // $FlowFixMe[untyped-import]
  shift,
  // $FlowFixMe[untyped-import]
  useFloating,
} from '@floating-ui/react';

import {useReferenceElementWidth} from '../../hooks';
import {spaceNone, spaceXXSmall} from '../../styles/variables/_space';
import {classify} from '../../utils/classify';
import {type ClickAwayRefType, ClickAway} from '../../utils/click-away';
import {mergeRefs} from '../../utils/merge-refs';
import type {UnstyledButtonProps} from '../Button';
import {UnstyledButton} from '../Button';
import type {AnchorType} from '../ButtonDropdown';
import {Icon} from '../Icon';
import type {MenuOption, MenuProps} from '../Menu';
import {Menu} from '../Menu';
import {type ElevationType, getElevationValue} from '../Tooltip';
import {Truncate} from '../Truncate';

import css from './InlineDropdown.module.css';


type ClassNames = $ReadOnly<{
  buttonWrapper?: string,
  dropdownContainer?: string,
}>;

export type InlineDropdownProps = {
  ...UnstyledButtonProps,
  classNames?: ClassNames,
  menu?: MenuProps,
  anchorPosition?: AnchorType,
  onOptionSelect?: (option: MenuOption, ?SyntheticEvent<HTMLElement>) => mixed,
  onMenuOpen?: () => mixed,
  onMenuClose?: () => mixed,
  size?: 'medium' | 'small' | 'extraSmall',
  elevation?: ElevationType,
  clickAwayRef?: ClickAwayRefType,
  ...
};

export const InlineDropdown: React$AbstractComponent<
  InlineDropdownProps,
  HTMLDivElement,
> = React.forwardRef<InlineDropdownProps, HTMLDivElement>(
  (
    {
      anchorPosition = 'bottom-start',
      size = 'medium',
      onOptionSelect,
      menu,
      classNames,
      disabled,
      onMenuOpen,
      onMenuClose,
      children,
      clickAwayRef,
      elevation = 'modal',
      ...restButtonProps
    }: InlineDropdownProps,
    ref,
  ): React.Node => {
    const {x, y, refs, strategy, context} = useFloating({
      open: true,
      strategy: 'absolute',
      placement: anchorPosition,
      whileElementsMounted: autoUpdate,
      middleware: [shift(), flip(), offset(parseInt(spaceXXSmall))],
    });

    const dropdownWidth = useReferenceElementWidth(refs.reference?.current);

    const onMenuToggle = (isOpen: boolean) => {
      isOpen ? onMenuOpen?.() : onMenuClose?.();
    };

    return (
      <ClickAway onChange={onMenuToggle} clickAwayRef={clickAwayRef}>
        {({isOpen, onOpen, clickAway, boundaryRef, triggerRef}) => (
          <div
            data-testid="InlineDropdown"
            className={classify(
              css.inlineDropdownContainer,
              classNames?.dropdownContainer,
            )}
            ref={ref}
          >
            <UnstyledButton
              {...restButtonProps}
              disabled={disabled}
              ref={mergeRefs([refs.setReference, triggerRef])}
              onClick={(e) => {
                e.stopPropagation();
                onOpen();
              }}
              className={classify(
                css.inlineButton,
                {
                  [css.disabled]: disabled,
                },
                css[size],
                classNames?.buttonWrapper,
              )}
            >
              <Truncate>{children}</Truncate>
              <Icon
                name={isOpen ? 'caret-up' : 'caret-down'}
                size="small"
                type="solid"
                className={classify({
                  [css.disabled]: disabled,
                })}
              />
            </UnstyledButton>
            {isOpen && menu && (
              <FloatingPortal>
                <FloatingFocusManager
                  modal={false}
                  context={context}
                  initialFocus={triggerRef}
                >
                  <div
                    className={css.menuWrapper}
                    ref={mergeRefs([refs.setFloating, boundaryRef])}
                    style={{
                      display: 'flex',
                      position: strategy,
                      top: y ?? spaceNone,
                      left: x ?? spaceNone,
                      /* NOTE(Sharad): The FloatingPortal renders the menu outside the normal DOM structure,
                       so its parent is effectively the <body> element. This means the menu
                       would otherwise default to the body's width. To support fluid width,
                       we must manually set the dropdown width here; otherwise, it uses a fixed width.
                       Also, Only treat menu as non-fluid if isFluid is strictly false, since default is true in menu and undefined means fluid. */ ...(menu.isFluid !==
                        false && {
                        '--dropdown-width': dropdownWidth,
                      }),
                      '--menu-elevation': getElevationValue(elevation),
                    }}
                  >
                    <Menu
                      {...menu}
                      onSelect={(option, e) => {
                        onOptionSelect && onOptionSelect(option, e);
                        if (
                          // option.keepMenuOpenOnOptionSelect - to allow the menu persist its open stat upon option selection in normal variant
                          !option.keepMenuOpenOnOptionSelect &&
                          (!menu.optionsVariant ||
                            menu.optionsVariant === 'normal')
                        ) {
                          clickAway();
                        }
                      }}
                      size={menu.size || 'medium'}
                      onTabOut={clickAway}
                    />
                  </div>
                </FloatingFocusManager>
              </FloatingPortal>
            )}
          </div>
        )}
      </ClickAway>
    );
  },
);