import { marked } from 'marked'

/** 渲染 Markdown（先转义 HTML，避免模型输出的 HTML 被直接执行） */
export function renderMarkdown(md: string) {
  if (!md) return ''
  const escaped = md.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;')
  return marked.parse(escaped, { async: false, breaks: true, gfm: true }) as string
}

export function formatTime(t: string | number | Date | null | undefined) {
  if (!t) return ''
  return new Date(t).toLocaleString('zh-CN', { hour12: false, month: '2-digit', day: '2-digit', hour: '2-digit', minute: '2-digit', second: '2-digit' })
}

export function formatWords(n: number) {
  return n >= 10000 ? `${(n / 10000).toFixed(1)} 万字` : `${n} 字`
}

/** 取出接口错误信息 */
export function apiErrorMessage(err: unknown, fallback = '请求失败') {
  const e = err as { data?: { message?: string, statusMessage?: string }, message?: string }
  return e.data?.message || e.data?.statusMessage || e.message || fallback
}