admin / SAynapse-Horizon

import { useCallback, useEffect, useMemo, useRef, useState } from 'react'
import { SOURCES, REFRESH_OPTIONS, CADENCE_OPTIONS } from '../data/sources'
import { severityMeta } from '../utils/theme'
import { getFeeds, syncFeeds } from '../api/client'

const initialEnabled = () => Object.fromEntries(SOURCES.map((s) => [s.key, s.defaultOn]))

/**
 * Owns all CTI state. Data now comes from the live ingestion backend:
 *  - initial load  → GET /api/feeds (cached snapshot)
 *  - force sync / cadence tick → POST /api/sync (live pull)
 *  - toggling a source filters the local store instantly; enabling one with no
 *    data pulls just that source.
 */
export function useFeeds() {
  const [enabled, setEnabled] = useState(initialEnabled)
  const [store, setStore] = useState([]) // all normalized IOCs from the backend
  const [sourceStatus, setSourceStatus] = useState({}) // key -> { status, configured, message, ... }
  const [loading, setLoading] = useState(true)
  const [lastPull, setLastPull] = useState(null)
  const [error, setError] = useState(null)
  const [refreshKey, setRefreshKey] = useState('30s')
  const [cadenceKey, setCadenceKey] = useState('6h')
  const [displayTick, setDisplayTick] = useState(Date.now())

  const pullTimer = useRef(null)
  const refreshTimer = useRef(null)
  const inflight = useRef(false)

  const applySnapshot = useCallback((snap) => {
    setStore(Array.isArray(snap.iocs) ? snap.iocs : [])
    setSourceStatus(snap.sources || {})
    setLastPull(snap.generatedAt || new Date().toISOString())
    setDisplayTick(Date.now())
  }, [])

  // --- Live pull (ingestion lifecycle) --------------------------------------
  const pull = useCallback(
    async (sources) => {
      if (inflight.current) return
      inflight.current = true
      setLoading(true)
      setError(null)
      try {
        const snap = await syncFeeds(sources)
        applySnapshot(snap)
      } catch (err) {
        setError(err.message || 'Ingestion service unreachable')
      } finally {
        setLoading(false)
        inflight.current = false
      }
    },
    [applySnapshot]
  )

  // --- Initial load: read the cached snapshot, sync only if empty -----------
  useEffect(() => {
    let alive = true
    ;(async () => {
      try {
        const snap = await getFeeds()
        if (!alive) return
        applySnapshot(snap)
        if (!snap.iocs?.length) await pull()
      } catch (err) {
        if (alive) setError(err.message || 'Ingestion service unreachable')
      } finally {
        if (alive) setLoading(false)
      }
    })()
    return () => {
      alive = false
    }
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [])

  // --- Background feed-pull cadence -----------------------------------------
  useEffect(() => {
    if (pullTimer.current) clearInterval(pullTimer.current)
    const opt = CADENCE_OPTIONS.find((o) => o.key === cadenceKey)
    if (opt && opt.ms > 0) pullTimer.current = setInterval(() => pull(), opt.ms)
    return () => pullTimer.current && clearInterval(pullTimer.current)
  }, [cadenceKey, pull])

  // --- Display-layer auto-refresh -------------------------------------------
  // Re-reads the cached snapshot (cheap) and recomputes ages / re-sorts.
  useEffect(() => {
    if (refreshTimer.current) clearInterval(refreshTimer.current)
    const opt = REFRESH_OPTIONS.find((o) => o.key === refreshKey)
    if (opt && opt.ms > 0) {
      refreshTimer.current = setInterval(async () => {
        setDisplayTick(Date.now())
        try {
          const snap = await getFeeds()
          applySnapshot(snap)
        } catch {
          /* transient — keep last known state */
        }
      }, opt.ms)
    }
    return () => refreshTimer.current && clearInterval(refreshTimer.current)
  }, [refreshKey, applySnapshot])

  const toggleSource = useCallback(
    (key) => {
      setEnabled((prev) => {
        const next = { ...prev, [key]: !prev[key] }
        // Turning a source on with no cached data → pull just that source.
        if (next[key]) {
          const hasData = store.some((r) => r.source === key)
          const st = sourceStatus[key]
          if (!hasData && (!st || st.configured !== false)) pull([key])
        }
        return next
      })
    },
    [store, sourceStatus, pull]
  )

  // --- Derived, source-filtered views ---------------------------------------
  const visible = useMemo(() => store.filter((r) => enabled[r.source]), [store, enabled])

  const critical = useMemo(() => {
    return [...visible]
      .sort((a, b) => {
        const rank = severityMeta(b.severity).rank - severityMeta(a.severity).rank
        if (rank !== 0) return rank
        if (b.confidence !== a.confidence) return b.confidence - a.confidence
        return new Date(b.detectedAt) - new Date(a.detectedAt)
      })
      .filter((r) => r.severity === 'critical' || r.severity === 'high')
      .slice(0, 5)
  }, [visible])

  const activeCount = useMemo(() => SOURCES.filter((s) => enabled[s.key]).length, [enabled])

  return {
    enabled,
    loading,
    lastPull,
    error,
    refreshKey,
    cadenceKey,
    displayTick,
    sourceStatus,
    store,
    visible,
    critical,
    activeCount,
    totalSources: SOURCES.length,
    pull,
    toggleSource,
    setRefreshKey,
    setCadenceKey,
  }
}