// Sitemap entries for Journal content. Every loc is built from journal.routes,
// so moving or disabling a view moves or drops its URLs; nothing hard-codes
// a path.

import { flattenCategories } from './client.ts'
import { fillJournalPath } from './routes.ts'
import type { JournalCategory, JournalPost, JournalRoutes } from './types.ts'

export interface JournalSitemapEntry {
  loc: string
  lastmod?: string
}

/**
 * One entry per published post (lastmod = updated_at) at routes.post, and one
 * per category of the flattened tree at routes.category. A disabled route
 * contributes nothing.
 */
export function buildJournalSitemapEntries(
  posts: readonly JournalPost[],
  categories: readonly JournalCategory[],
  routes: JournalRoutes,
): JournalSitemapEntry[] {
  const entries: JournalSitemapEntry[] = []
  if (routes.post !== false) {
    for (const post of posts) {
      if (!post.published || !post.slug) continue
      const entry: JournalSitemapEntry = { loc: fillJournalPath(routes.post, { slug: post.slug }) }
      if (post.updated_at) entry.lastmod = post.updated_at
      entries.push(entry)
    }
  }
  if (routes.category !== false) {
    for (const category of flattenCategories(categories)) {
      if (!category.slug) continue
      entries.push({ loc: fillJournalPath(routes.category, { category: category.slug }) })
    }
  }
  return entries
}