/**
 * 栏目标题（CommonSectionTitle）统一读取器
 *
 * 用法：
 *   const st = await useSectionTitles()
 *   <CommonSectionTitle
 *     :title="st('summerCamp.principles', '行程设计四大原则')"
 *     :subtitle="st('summerCamp.principles', '每一处安排都经过精心考量', 'subtitle')"
 *   />
 *
 * st(path, fallback, field = 'title') 三个参数都是字符串。
 * field 可选 'title' | 'subtitle' | 'label'。
 */

export async function useSectionTitles() {
  const { data } = await usePublicApi('section-titles')

  return (path, fallback = '', field = 'title') => {
    const parts = (path || '').split('.')
    let cursor = data.value
    for (const p of parts) {
      if (cursor && typeof cursor === 'object' && p in cursor) {
        cursor = cursor[p]
      } else {
        return fallback
      }
    }
    if (cursor && typeof cursor === 'object') {
      return cursor[field] || fallback
    }
    return fallback
  }
}