stack/packages/ui/src/components/Textarea.tsx

import type { TextareaHTMLAttributes } from "react";

export interface TextareaProps extends Omit<TextareaHTMLAttributes<HTMLTextAreaElement>, "size"> {
  label?: string;
  error?: string;
  helperText?: string;
  fullWidth?: boolean;
  resize?: "none" | "both" | "horizontal" | "vertical";
}

export function Textarea({
  label,
  error,
  helperText,
  fullWidth = false,
  resize = "vertical",
  className = "",
  id,
  ...props
}: TextareaProps) {
  const textareaId = id || `textarea-${Math.random().toString(36).substr(2, 9)}`;
  const errorId = error ? `${textareaId}-error` : undefined;
  const helperId = helperText ? `${textareaId}-helper` : undefined;

  const baseStyles = "px-3 py-2 border rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500 transition-colors";
  const widthStyles = fullWidth ? "w-full" : "";
  const resizeStyles = {
    none: "resize-none",
    both: "resize",
    horizontal: "resize-x",
    vertical: "resize-y",
  };
  const errorStyles = error ? "border-red-500 focus:ring-red-500" : "border-gray-300";

  const combinedClassName = [
    baseStyles,
    widthStyles,
    resizeStyles[resize],
    errorStyles,
    className,
  ].filter(Boolean).join(" ");

  return (
    <div className={fullWidth ? "w-full" : ""}>
      {label && (
        <label
          htmlFor={textareaId}
          className="block text-sm font-medium text-gray-700 mb-1"
        >
          {label}
        </label>
      )}
      <textarea
        id={textareaId}
        className={combinedClassName}
        aria-invalid={error ? "true" : "false"}
        aria-describedby={[errorId, helperId].filter(Boolean).join(" ") || undefined}
        {...props}
      />
      {error && (
        <p id={errorId} className="mt-1 text-sm text-red-600" role="alert">
          {error}
        </p>
      )}
      {helperText && !error && (
        <p id={helperId} className="mt-1 text-sm text-gray-500">
          {helperText}
        </p>
      )}
    </div>
  );
}