import type { Article } from '#shared/types/blog'

interface AdminUser {
  firstname: string | null
  lastname: string | null
}

type RawArticle = Omit<Article, 'html' | 'summary' | 'author'> & {
  content: string | null
  createdBy?: AdminUser | null
}

/** Joins the admin user's name parts; returns null when neither is set. */
function byline(user: AdminUser | null | undefined): string | null {
  const name = [user?.firstname, user?.lastname].filter(Boolean).join(' ').trim()
  return name || null
}

export default defineEventHandler(async (event): Promise<Article> => {
  const slug = getRouterParam(event, 'slug')
  const locale = localeParam(getQuery(event).lang)

  if (!slug) {
    throw createError({ statusCode: 400, statusMessage: 'Missing article slug' })
  }

  const response = await strapiFetch<StrapiList<RawArticle>>(
    `/api/articles?${ARTICLE_DETAIL_QUERY}&locale=${locale}&filters[slug][$eq]=${encodeURIComponent(slug)}&pagination[pageSize]=1`
  )

  const article = response.data[0]

  if (!article) {
    throw createError({ statusCode: 404, statusMessage: 'Article not found' })
  }

  const { content, createdBy, ...rest } = article
  return {
    ...rest,
    html: renderMarkdown(content),
    summary: summarise(content),
    author: byline(createdBy),
  }
})