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frontend/src/hooks/useEVSessions.ts

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+import { useCallback, useEffect, useState } from 'react'
+
+import { getActiveEvSessions, type ActiveEvSessionRow } from '../api/backend'
+
+const POLL_MS = 30_000
+
+export function useEVSessions(siteId: number | null) {
+  const [sessions, setSessions] = useState<ActiveEvSessionRow[]>([])
+  const [ready, setReady] = useState(false)
+  const [error, setError] = useState<string | null>(null)
+
+  const load = useCallback(async () => {
+    if (siteId == null) {
+      setSessions([])
+      setReady(true)
+      return
+    }
+    try {
+      const rows = await getActiveEvSessions(siteId)
+      setSessions(rows)
+      setError(null)
+    } catch {
+      setSessions([])
+      setError('EV session se nepodařilo načíst')
+    } finally {
+      setReady(true)
+    }
+  }, [siteId])
+
+  useEffect(() => {
+    void load()
+    if (siteId == null) return
+    const id = window.setInterval(() => void load(), POLL_MS)
+    return () => window.clearInterval(id)
+  }, [load, siteId])
+
+  return { sessions, ready, error, reload: load }
+}