import { effect, h } from '@ui-arch/frame';
import type { TextareaProps } from './types.js';

/*** 多行输入：value 信号双向绑定，disabled 支持布尔或信号禁用，onInput 为输入回调 ***/
export function textarea(props: TextareaProps): HTMLTextAreaElement {
  const el = h('textarea', { class: 'ua-textarea', rows: props.rows ?? 3, placeholder: props.placeholder ?? '', disabled: props.disabled }) as HTMLTextAreaElement; // false/undefined 移除属性，Signal 走响应式
  if (props.value) {
    const signal = props.value;
    el.addEventListener('input', () => signal(el.value)); // 用户输入写回信号
    effect(() => {
      if (el.value !== signal()) el.value = signal(); // 外部变化写回输入框
    });
  }
  if (props.onInput) el.addEventListener('input', () => props.onInput!(el.value));
  return el;
}