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

/*** 进度条：value 信号驱动 0-100 定量态，缺省 value 则退化为不确定态（无限往复）；满格切 success 色并停条纹 ***/
export function progress(props: ProgressProps = {}): HTMLElement {
  // —— 状态集中声明 ——
  const value = props.value;                 // 可选：不传即不确定态
  const fill = h('div', { class: 'ua-progress-fill' });
  const track = h('div', { class: 'ua-progress-track' }, fill);
  const text = h('span', { class: 'ua-progress-text' });
  const withText = props.showText !== false && !!value; // 不确定态没有百分比可显示

  if (!value) {
    fill.classList.add('ua-indeterminate');  // 宽度与往复动画交给 CSS
    return h('div', { class: 'ua-progress', role: 'progressbar', 'aria-label': '进行中' }, track);
  }
  effect(() => {
    const v = clamp(value()); // 依赖收集：信号变化自动写回
    fill.style.width = `${v}%`;
    fill.classList.toggle('ua-done', v >= 100); // 满格切语义色
    text.textContent = `${Math.round(v)}%`;
  });
  return h(
    'div',
    {
      class: 'ua-progress',
      role: 'progressbar',
      'aria-valuemin': '0',
      'aria-valuemax': '100',
      'aria-valuenow': () => String(Math.round(clamp(value()))),
    },
    track,
    withText ? text : null,
  );
}

/*** 进度钳制到 0-100 ***/
function clamp(v: number): number {
  if (Number.isNaN(v)) return 0; // 卫语句：非法值归零
  return Math.min(100, Math.max(0, v));
}