// @flow strict

import * as React from 'react';

import {classify} from '../../utils/classify';
import type {IconType} from '../Icon';
import {CloseIcon, Icon} from '../Icon';
import {StatusIndicator} from '../StatusIndicator';
import {Truncate} from '../Truncate';

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


type ClassNames = $ReadOnly<{
  wrapper?: string,
  icon?: string,
  statusIndicator?: string,
}>;

export const CHIP_SEMANTIC = Object.freeze({
  primary: 'primary',
  information: 'information',
  success: 'success',
  warning: 'warning',
  danger: 'danger',
  secondary: 'secondary',
});

export type ChipSemanticType = $Values<typeof CHIP_SEMANTIC>;

export type BaseChipProps = {
  classNames?: ClassNames,
  semantic?: ChipSemanticType,
  children: React.Node,
  disabled?: boolean,
  showStatusIndicator?: boolean,
  disableHoverState?: boolean,
  line?: number,
  wordBreak?: string,
  onClick?: ?(SyntheticEvent<HTMLElement>) => mixed,
  onMouseEnter?: ?(SyntheticEvent<HTMLElement>) => mixed,
  onMouseLeave?: ?(SyntheticEvent<HTMLElement>) => mixed,
};

export type LargeChipProps = {
  ...BaseChipProps,
  iconName?: string,
  iconType?: IconType,
  dismissable?: boolean,
  onDismiss?: ?(SyntheticEvent<HTMLElement>) => mixed,
  size?: 'large',
};

export type MediumChipProps = {
  ...LargeChipProps,
  size?: 'medium',
};

export type SmallChipProps = {
  ...BaseChipProps,
  size?: 'small',
};

export type ChipProps = LargeChipProps | MediumChipProps | SmallChipProps;

export const Chip: React$AbstractComponent<ChipProps, HTMLDivElement> =
  React.forwardRef<ChipProps, HTMLDivElement>(
    (
      {
        classNames,
        semantic = 'primary',
        size = 'medium',
        children,
        iconName = '',
        iconType = 'regular',
        showStatusIndicator,
        dismissable = false,
        onDismiss = () => null,
        onClick,
        disabled,
        line = 1,
        wordBreak,
        disableHoverState = !onClick, // There is no reason for hover state to be active when there is no click handler attached
        ...restProps
      }: ChipProps,
      ref,
    ): React.Node => {
      /**
       * Note (Nishant): Why we are using a `div` to render a onclick element instead of a `button`?
       *
       * Rendering the `Chip` component as a button directly would have been ideal, as it would
       * have naturally handled interactivity and accessibility for clickable chips(which has an onClick). However,
       * the `Chip` component includes a `CloseIcon`, which itself is a button. Nesting a `<button>`
       * inside another `<button>` is semantically incorrect and would lead to improper HTML structure.
       *
       * Instead, we use a `<div>` with `role="button"` to maintain proper semantic behavior and
       * avoid nesting buttons. While `role="button"` provides the appropriate semantics, it does
       * not automatically handle keyboard interactions. Therefore, we manually handle `Enter`
       * and `Space` key events to ensure the component is fully accessible and keyboard-compliant.
       *
       * Although this method might seem less conventional, it simplifies implementation and ensures
       * backward compatibility while adhering to accessibility standards.
       */
      const handleKeyDown = (event: SyntheticKeyboardEvent<HTMLElement>) => {
        const {key} = event;
        if (key === 'Enter' || key === ' ') {
          event.preventDefault(); // Prevent default action for Enter and Space keys
          onClick?.(event);
        }
      };

      return (
        <div
          data-testid="Chip"
          {...restProps}
          ref={ref}
          className={classify(
            css.chipWrapper,
            {
              [css.primary]: semantic === CHIP_SEMANTIC.primary,
              [css.information]: semantic === CHIP_SEMANTIC.information,
              [css.success]: semantic === CHIP_SEMANTIC.success,
              [css.warning]: semantic === CHIP_SEMANTIC.warning,
              [css.danger]: semantic === CHIP_SEMANTIC.danger,
              [css.secondary]: semantic === CHIP_SEMANTIC.secondary,
              [css.large]: size === 'large',
              [css.medium]: size === 'medium',
              [css.small]: size === 'small',
              [css.dismissable]: dismissable,
              [css.withIcon]: !!iconName && size !== 'small',
              [css.disabled]: disabled,
              [css.noHoverState]:
                showStatusIndicator || disableHoverState || disabled,
            },
            classNames?.wrapper,
          )}
          onClick={onClick}
          onKeyDown={handleKeyDown}
          tabIndex={
            showStatusIndicator || disableHoverState || disabled ? undefined : 0
          }
          role={showStatusIndicator || disableHoverState ? undefined : 'button'}
        >
          {showStatusIndicator && size !== 'small' && (
            <StatusIndicator
              status={semantic}
              classNames={{
                wrapper: classify(
                  css.statusIndicatorBlock,
                  classNames?.statusIndicator,
                ),
              }}
              disabled={disabled}
            />
          )}

          {iconName && size !== 'small' && (
            <Icon
              className={classify(
                css.chipIcon,
                {[css.alignTop]: line > 1},
                classNames?.icon,
              )}
              name={iconName}
              type={iconType}
              size="small"
            />
          )}
          <Truncate line={line} wordBreak={wordBreak}>
            {children}
          </Truncate>

          {dismissable && size !== 'small' && (
            <CloseIcon
              classNames={{
                icon: css.dismissIcon,
                button: classify(
                  {[css.alignTop]: line > 1},
                  css.dismissIconWrapper,
                ),
              }}
              type={iconType}
              size="small"
              ariaLabel="Dismiss"
              disabled={disabled}
              onClick={(event) => {
                event.stopPropagation();
                if (!disabled && onDismiss) {
                  onDismiss(event);
                }
              }}
            />
          )}
        </div>
      );
    },
  );

Chip.displayName = 'Chip';