import { type HeadConfig, type TransformContext } from 'vitepress'

// 处理每个页面的元数据
export function handleHeadMeta (context: TransformContext) {
  // 预加载字体
  const preloadHead: HeadConfig[] = handleFontsPreload(context)
  
  return [ ...preloadHead]
}

export function addBase (relativePath: string) {
  const host = 'https://duyl328.github.io'
  if (relativePath.startsWith('/')) {
    return host + relativePath
  } else {
    return host + '/' + relativePath
  }
}

export function handleFontsPreload ({ assets }: TransformContext) {
  // 只预加载正文字体，代码字体不预加载，因为可能不会使用或者很少使用
  const SourceHanSerifCN = assets.find(
    file => /SourceHanSerifCN-VF\.\w+\.woff2/)
  
  if (SourceHanSerifCN) {
    return [
      [
        'link',
        {
          rel: 'preload',
          href: SourceHanSerifCN,
          as: 'font',
          type: 'font/woff2',
          crossorigin: '',
        },
      ],
    ] as HeadConfig[]
  }
  
  return []
}