tesseract/categories/freeform/react/src/components/MultilineTextInput/index.tsx

import * as React from 'react';
import { TextControl } from '@tesseract-design/web-base';
import clsx from 'clsx';

export type MultilineTextInputDerivedElement = HTMLTextAreaElement;

export interface MultilineTextInputProps extends Omit<React.HTMLProps<MultilineTextInputDerivedElement>, 'size' | 'style' | 'label'> {
  /**
   * Short textual description indicating the nature of the component's value.
   */
  label?: React.ReactNode,
  /**
   * Short textual description as guidelines for valid input values.
   */
  hint?: React.ReactNode,
  /**
   * Size of the component.
   */
  size?: TextControl.Size,
  /**
   * Additional description, usually graphical, indicating the nature of the component's value.
   */
  indicator?: React.ReactNode,
  /**
   * Should the component display a border?
   */
  border?: boolean,
  /**
   * Should the component occupy the whole width of its parent?
   */
  block?: boolean,
  /**
   * Style of the component.
   */
  variant?: TextControl.Variant,
  /**
   * Is the label hidden?
   */
  hiddenLabel?: boolean,
}

/**
 * Component for inputting textual values.
 *
 * This component supports multiline input and adjusts its layout accordingly.
 */
export const MultilineTextInput = React.forwardRef<MultilineTextInputDerivedElement, MultilineTextInputProps>(
  (
    {
      label,
      hint,
      indicator,
      size = 'medium' as const,
      border = false,
      block = false,
      variant = 'default' as const,
      hiddenLabel = false,
      className,
      ...etcProps
    }: MultilineTextInputProps,
    ref,
  ) => {
    const labelId = React.useId();

    return (
      <div
        className={clsx(
          'relative rounded ring-secondary/50',
          'focus-within:ring-4',
          {
            'block': block,
            'inline-block align-middle': !block,
          },
          className,
        )}
      >
        <textarea
          {...etcProps}
          ref={ref}
          aria-labelledby={labelId}
          data-testid="input"
          style={{
            height: 0,
          }}
          className={clsx(
            'bg-negative rounded-inherit w-full peer block',
            'focus:outline-0',
            'disabled:opacity-50 disabled:cursor-not-allowed',
            {
              'resize': !block,
              'resize-y': block,
            },
            {
              'text-xxs': size === 'small',
              'text-xs': size === 'medium',
            },
            {
              'pl-4': variant === 'default',
              'pl-1.5': variant === 'alternate',
            },
            {
              'pt-4': variant === 'alternate' && size === 'small',
              'pt-5': variant === 'alternate' && size === 'medium',
              'pt-8': variant === 'alternate' && size === 'large',
            },
            {
              'py-2.5': variant === 'default' && size === 'small',
              'py-3': variant === 'default' && size === 'medium',
              'py-5': variant === 'default' && size === 'large',
            },
            {
              'pr-4': variant === 'default' && !indicator,
              'pr-1.5': variant === 'alternate' && !indicator,
            },
            {
              'pr-10': indicator && size === 'small',
              'pr-12': indicator && size === 'medium',
              'pr-16': indicator && size === 'large',
            },
            {
              'min-h-10': size === 'small',
              'min-h-12': size === 'medium',
              'min-h-16': size === 'large',
            },
          )}
        />
        {
          label && (
            <label
              data-testid="label"
              id={labelId}
              className={clsx(
                'absolute z-[1] w-full top-0.5 left-0 pointer-events-none pl-1 text-xxs font-bold peer-disabled:opacity-50 peer-focus:text-secondary text-primary leading-none bg-negative',
                {
                  'sr-only': hiddenLabel,
                },
                {
                  'pr-1': !indicator,
                },
                {
                  'pr-10': indicator && size === 'small',
                  'pr-12': indicator && size === 'medium',
                  'pr-16': indicator && size === 'large',
                },
              )}
            >
              <span className="block w-full whitespace-nowrap h-[1.1em] overflow-hidden text-ellipsis">
                {label}
              </span>
            </label>
          )
        }
        {hint && (
          <div
            data-testid="hint"
            className={clsx(
              'absolute left-0 px-1 pointer-events-none text-xxs peer-disabled:opacity-50 leading-none w-full bg-negative',
              {
                'bottom-0 pl-4 pb-1': variant === 'default',
                'top-0.5': variant === 'alternate',
              },
              {
                'pt-2': variant === 'alternate' && size === 'small',
                'pt-3': variant === 'alternate' && size !== 'small',
              },
              {
                'pr-4': !indicator && variant === 'default',
                'pr-1': !indicator && variant === 'alternate',
              },
              {
                'pr-10': indicator && size === 'small',
                'pr-12': indicator && size === 'medium',
                'pr-16': indicator && size === 'large',
              },
            )}
          >
            <div
              className="opacity-50 whitespace-nowrap w-full h-[1.1em] overflow-hidden text-ellipsis"
            >
              {hint}
            </div>
          </div>
        )}
        {indicator && (
          <div
            className={clsx(
              'text-center flex items-center justify-center peer-disabled:opacity-50 aspect-square absolute bottom-0 right-0 pointer-events-none',
              {
                'w-10': size === 'small',
                'w-12': size === 'medium',
                'w-16': size === 'large',
              },
            )}
          >
            {indicator}
          </div>
        )}
        {
          border && (
            <span
              data-testid="border"
              className="absolute z-[1] peer-disabled:opacity-50 inset-0 rounded-inherit border-2 border-primary pointer-events-none peer-focus:border-secondary"
            />
          )
        }
      </div>
    );
  }
);

MultilineTextInput.displayName = 'MultilineTextInput';