import { getPayload } from 'payload'
import configPromise from '@payload-config'
import { TOPICS, topicsFor, type TopicKey } from '@/lib/topics'

export type IndexDoc = {
  id: number | string
  title: string
  slug: string
  dek: string
  access: 'free' | 'vip'
  category: string
  level: string
  publishedAt: string | null
  updatedAt: string | null
  /** Present only when requested via fetchIndexDocs(true). */
  content?: unknown
}

/** Published posts, public read path — no overrideAccess (drafts stay hidden,
 *  and the content field's own read ACL decides body availability). */
export async function fetchIndexDocs(withContent = false): Promise<IndexDoc[]> {
  const payload = await getPayload({ config: configPromise })
  const { docs } = await payload.find({
    collection: 'posts',
    where: { status: { equals: 'published' } },
    depth: 0,
    limit: 500,
    sort: '-publishedAt',
    select: {
      title: true,
      slug: true,
      dek: true,
      access: true,
      category: true,
      level: true,
      publishedAt: true,
      updatedAt: true,
      ...(withContent ? { content: true } : {}),
    },
  })
  return docs as unknown as IndexDoc[]
}

export const SITE_TITLE = 'أنور بآي — أدلة الذكاء الاصطناعي العملي بالعربية'
export const SITE_INTRO = 'دليلك العربي للذكاء الاصطناعي العملي: وكلاء، نماذج، وأدوات.'

/** Topic-grouped markdown index lines; a post can appear under several topics. */
export function renderIndexSections(docs: IndexDoc[], markVip: boolean): string {
  const lines: string[] = []
  for (const topic of TOPICS) {
    const items = docs.filter(doc => topicsFor(doc).includes(topic.key))
    if (items.length === 0) continue
    lines.push(`## ${topic.label}`, '')
    for (const doc of items) {
      const suffix = markVip && doc.access === 'vip' ? ' (دليل للأعضاء)' : ''
      lines.push(`- [${doc.title}${suffix}](/posts/${doc.slug}): ${doc.dek}`)
    }
    lines.push('')
  }
  return lines.join('\n')
}