// @flow strict

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

import {spaceNone, spaceXXSmall} from '../../styles/variables/_space';
import {classify} from '../../utils/classify';
import {ClickAway} from '../../utils/click-away';
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 {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) => mixed,
  onMenuOpen?: () => mixed,
  onMenuClose?: () => mixed,
  size?: 'medium' | 'small' | 'extraSmall',
  ...
};

export const InlineDropdown: React$AbstractComponent<
  InlineDropdownProps,
  HTMLDivElement,
> = React.forwardRef<InlineDropdownProps, HTMLDivElement>(
  (
    {
      anchorPosition = 'bottom-start',
      size = 'medium',
      onOptionSelect,
      menu,
      classNames,
      disabled,
      onMenuOpen,
      onMenuClose,
      children,
      ...restButtonProps
    }: InlineDropdownProps,
    ref,
  ): React.Node => {
    const menuBtnRef = React.useRef(null);
    React.useImperativeHandle(ref, () => menuBtnRef.current);
    const {x, y, reference, floating, strategy} = useFloating({
      strategy: 'absolute',
      placement: anchorPosition,
      whileElementsMounted: autoUpdate,
      middleware: [shift(), flip(), offset(parseInt(spaceXXSmall))],
    });

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

    return (
      <ClickAway onChange={onMenuToggle}>
        {({isOpen, onOpen, cancelNext, clickAway}) => (
          <div
            data-testid="InlineDropdown"
            className={classify(
              css.inlineDropdownContainer,
              classNames?.dropdownContainer,
            )}
            ref={menuBtnRef}
          >
            <UnstyledButton
              {...restButtonProps}
              disabled={disabled}
              ref={reference}
              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 && (
              <div
                onClickCapture={cancelNext}
                ref={floating}
                style={{
                  display: 'flex',
                  position: strategy,
                  top: y ?? spaceNone,
                  left: x ?? spaceNone,
                }}
              >
                <Menu
                  {...menu}
                  onSelect={(option) => {
                    onOptionSelect && onOptionSelect(option);
                    if (
                      !menu.optionsVariant ||
                      menu.optionsVariant === 'normal'
                    ) {
                      clickAway();
                    }
                  }}
                  size={menu.size || 'medium'}
                />
              </div>
            )}
          </div>
        )}
      </ClickAway>
    );
  },
);