import {forwardRef as reactForwardRef, useMemo} from 'react';
import isPropValid from '@emotion/is-prop-valid';
import styled from '@emotion/styled';

import Tooltip, {InternalTooltipProps} from 'sentry/components/tooltip';
import space from 'sentry/styles/space';
import {defined} from 'sentry/utils';
import domId from 'sentry/utils/domId';
import {FormSize, Theme} from 'sentry/utils/theme';

/**
 * Menu item priority. Determines the text and background color.
 */
type Priority = 'primary' | 'danger' | 'default';

export type MenuListItemProps = {
  /**
   * Optional descriptive text. Like 'label', should preferably be a string or
   * have appropriate aria-labels.
   */
  details?: React.ReactNode;
  /**
   * Whether the item is disabled (if true, the item will be grayed out and
   * non-interactive).
   */
  disabled?: boolean;
  /**
   * Item label. Should preferably be a string. If not, make sure that
   * there are appropriate aria-labels.
   */
  label?: React.ReactNode;
  /*
   * Items to be added to the left of the label
   */
  leadingItems?: React.ReactNode;
  /*
   * Whether leading items should be centered with respect to the entire
   * height of the item. If false (default), they will be centered with
   * respect to the first line of the label element.
   */
  leadingItemsSpanFullHeight?: boolean;
  /**
   * Accented text and background (on hover) colors.
   */
  priority?: Priority;
  /**
   * Whether to show a line divider below this item
   */
  showDivider?: boolean;
  /**
   * Determines the item's font sizes and internal paddings.
   */
  size?: FormSize;
  /**
   * Optional tooltip that appears when the use hovers over the item. This is
   * not very visible - if possible, add additional text via the `details`
   * prop instead.
   */
  tooltip?: React.ReactNode;
  /**
   * Additional props to be passed into <Tooltip />.
   */
  tooltipOptions?: Omit<InternalTooltipProps, 'children' | 'title' | 'className'>;
  /*
   * Items to be added to the right of the label.
   */
  trailingItems?: React.ReactNode;
  /*
   * Whether trailing items should be centered wrt/ the entire height of the
   * item. If false (default), they will be centered wrt/ the first line of
   * the label element.
   */
  trailingItemsSpanFullHeight?: boolean;
};

interface OtherProps {
  as?: React.ElementType;
  detailsProps?: object;
  innerWrapProps?: object;
  isFocused?: boolean;
  labelProps?: object;
}

interface Props extends MenuListItemProps, OtherProps {
  forwardRef: React.ForwardedRef<HTMLLIElement>;
}

function BaseMenuListItem({
  label,
  details,
  as = 'li',
  priority = 'default',
  size,
  disabled = false,
  showDivider = false,
  leadingItems = false,
  leadingItemsSpanFullHeight = false,
  trailingItems = false,
  trailingItemsSpanFullHeight = false,
  isFocused = false,
  innerWrapProps = {},
  labelProps = {},
  detailsProps = {},
  tooltip,
  tooltipOptions = {delay: 500},
  forwardRef,
  ...props
}: Props) {
  const labelId = useMemo(() => domId('menuitem-label-'), []);
  const detailId = useMemo(() => domId('menuitem-details-'), []);

  return (
    <MenuItemWrap
      role="menuitem"
      aria-disabled={disabled}
      aria-labelledby={labelId}
      aria-describedby={detailId}
      as={as}
      ref={forwardRef}
      {...props}
    >
      <Tooltip skipWrapper title={tooltip} {...tooltipOptions}>
        <InnerWrap
          isFocused={isFocused}
          disabled={disabled}
          priority={priority}
          size={size}
          {...innerWrapProps}
        >
          {leadingItems && (
            <LeadingItems
              disabled={disabled}
              spanFullHeight={leadingItemsSpanFullHeight}
              size={size}
            >
              {leadingItems}
            </LeadingItems>
          )}
          <ContentWrap
            isFocused={isFocused}
            showDivider={defined(details) || showDivider}
            size={size}
          >
            <LabelWrap>
              <Label id={labelId} aria-hidden="true" {...labelProps}>
                {label}
              </Label>
              {details && (
                <Details
                  id={detailId}
                  disabled={disabled}
                  priority={priority}
                  {...detailsProps}
                >
                  {details}
                </Details>
              )}
            </LabelWrap>
            {trailingItems && (
              <TrailingItems
                disabled={disabled}
                spanFullHeight={trailingItemsSpanFullHeight}
              >
                {trailingItems}
              </TrailingItems>
            )}
          </ContentWrap>
        </InnerWrap>
      </Tooltip>
    </MenuItemWrap>
  );
}

const MenuListItem = reactForwardRef<HTMLLIElement, MenuListItemProps & OtherProps>(
  (props, ref) => <BaseMenuListItem {...props} forwardRef={ref} />
);

export default MenuListItem;

const MenuItemWrap = styled('li')`
  position: static;
  list-style-type: none;
  margin: 0;
  padding: 0 ${space(0.5)};
  cursor: pointer;

  &:focus {
    outline: none;
  }
  &:focus-visible {
    outline: none;
  }
`;

function getTextColor({
  theme,
  priority,
  disabled,
}: {
  disabled: boolean;
  priority: Priority;
  theme: Theme;
}) {
  if (disabled) {
    return theme.subText;
  }
  switch (priority) {
    case 'primary':
      return theme.activeText;
    case 'danger':
      return theme.errorText;
    case 'default':
    default:
      return theme.textColor;
  }
}

function getFocusBackground({theme, priority}: {priority: Priority; theme: Theme}) {
  switch (priority) {
    case 'primary':
      return theme.purple100;
    case 'danger':
      return theme.red100;
    case 'default':
    default:
      return theme.hover;
  }
}

export const InnerWrap = styled('div', {
  shouldForwardProp: prop =>
    typeof prop === 'string' &&
    isPropValid(prop) &&
    !['disabled', 'isFocused', 'priority'].includes(prop),
})<{
  disabled: boolean;
  isFocused: boolean;
  priority: Priority;
  size: Props['size'];
}>`
  display: flex;
  position: relative;
  padding: 0 ${space(1)} 0 ${space(1.5)};
  border-radius: ${p => p.theme.borderRadius};
  box-sizing: border-box;

  font-size: ${p => p.theme.form[p.size ?? 'md'].fontSize};

  &,
  &:hover {
    color: ${getTextColor};
  }
  ${p => p.disabled && `cursor: default;`}

  ${p =>
    p.isFocused &&
    `
      z-index: 1;

      ::before, ::after {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
      }

      /* Background to hide the previous item's divider */
      ::before {
        background: ${p.theme.background};
        z-index: -1;
      }

      /* Hover/focus background */
      ::after {
        background: ${getFocusBackground(p)};
        border-radius: inherit;
        z-index: -1;
      }
    `}
`;

/**
 * Returns the appropriate vertical padding based on the size prop. To be used
 * as top/bottom padding/margin in ContentWrap and LeadingItems.
 */
const getVerticalPadding = (size: Props['size']) => {
  switch (size) {
    case 'xs':
      return space(0.5);
    case 'sm':
      return space(0.75);
    case 'md':
    default:
      return space(1);
  }
};

const ContentWrap = styled('div')<{
  isFocused: boolean;
  showDivider: boolean;
  size: Props['size'];
}>`
  position: relative;
  width: 100%;
  min-width: 0;
  display: flex;
  gap: ${space(1)};
  justify-content: space-between;
  padding: ${p => getVerticalPadding(p.size)} 0;

  ${p =>
    p.showDivider &&
    !p.isFocused &&
    `
      ${MenuItemWrap}:not(:last-child) &::after {
        content: '';
        position: absolute;
        left: 0;
        bottom: 0;
        width: 100%;
        height: 1px;
        box-shadow:  0 1px 0 0 ${p.theme.innerBorder};
      }
    `}
`;

const LeadingItems = styled('div')<{
  disabled: boolean;
  size: Props['size'];
  spanFullHeight: boolean;
}>`
  display: flex;
  align-items: center;
  height: 1.4em;
  gap: ${space(1)};
  margin-top: ${p => getVerticalPadding(p.size)};
  margin-right: ${space(1)};

  ${p => p.disabled && `opacity: 0.5;`}
  ${p => p.spanFullHeight && `height: 100%;`}
`;

const LabelWrap = styled('div')`
  padding-right: ${space(1)};
  width: 100%;
  min-width: 0;
`;

const Label = styled('p')`
  margin-bottom: 0;
  line-height: 1.4;
  white-space: nowrap;

  ${p => p.theme.overflowEllipsis}
`;

const Details = styled('p')<{disabled: boolean; priority: Priority}>`
  font-size: ${p => p.theme.fontSizeSmall};
  color: ${p => p.theme.subText};
  line-height: 1.2;
  margin-bottom: 0;
  ${p => p.theme.overflowEllipsis}

  ${p => p.priority !== 'default' && `color: ${getTextColor(p)};`}
`;

const TrailingItems = styled('div')<{disabled: boolean; spanFullHeight: boolean}>`
  display: flex;
  align-items: center;
  height: 1.4em;
  gap: ${space(1)};
  margin-right: ${space(0.5)};

  ${p => p.disabled && `opacity: 0.5;`}
  ${p => p.spanFullHeight && `height: 100%;`}
`;