import { parseRssItems } from '../rss-helpers.js'
import { state } from '../state.js'

let cache = null // { url, episodes }
let cacheAt = 0
const CACHE_TTL = 30 * 60 * 1000

function feedUrl() {
  return state.cachedSiteContent?.nuggets?.rssFeedUrl?.trim() ?? ''
}

async function fetchNuggetsEpisodes() {
  const url = feedUrl()
  if (!url) { cache = null; return [] }

  const now = Date.now()
  if (cache && cache.url === url && (now - cacheAt) < CACHE_TTL) {
    return cache.episodes
  }

  const controller = new AbortController()
  const timeout = setTimeout(() => controller.abort(), 8000)
  try {
    const response = await fetch(url, { signal: controller.signal })
    clearTimeout(timeout)
    if (!response.ok) throw new Error(`RSS fetch failed: ${response.status}`)
    const xml = await response.text()
    const episodes = parseRssItems(xml)
    cache = { url, episodes }
    cacheAt = now
    return episodes
  } catch (err) {
    clearTimeout(timeout)
    // Serve stale cache for this same URL rather than a hard failure, if we have one.
    if (cache && cache.url === url) return cache.episodes
    throw err
  }
}

export function register(app) {
  app.get('/api/nuggets/episodes', async (_req, res) => {
    const configured = Boolean(feedUrl())
    try {
      const episodes = await fetchNuggetsEpisodes()
      res.json({ episodes: episodes.slice(0, 6), configured })
    } catch (err) {
      console.error('[nuggets/episodes] RSS fetch error:', err.message)
      res.json({ episodes: [], configured })
    }
  })

  app.get('/api/nuggets/episodes/all', async (_req, res) => {
    const configured = Boolean(feedUrl())
    try {
      const episodes = await fetchNuggetsEpisodes()
      res.json({ episodes, configured })
    } catch (err) {
      console.error('[nuggets/episodes/all] RSS fetch error:', err.message)
      res.json({ episodes: [], configured })
    }
  })
}