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Defaults to '/api/wall-scenes'. */\n scenesEndpoint?: string;\n /** Public scene poll interval. 0 disables polling. Default 10000. */\n pollMs?: number;\n /** Auto-rotation interval. 0 disables rotation. Default 10000. */\n rotationMs?: number;\n}\n\nexport interface UseWallScenesResult {\n scenes: WallScene[];\n activeScene: WallScene | null;\n /** Index of the active scene in the (newest-first) `scenes` array — useful for thumbnail highlight. */\n activeSceneIndex: number;\n /** Jump rotation to a specific scene; resets the rotation timer. */\n setActiveScene: (id: string) => void;\n /** Re-fetch scenes (used after creating one). */\n refresh: () => Promise;\n}\n\n/**\n * Manages the wall scene list, public polling, and the auto-rotating slideshow\n * with new-arrival interrupt logic for TV/live wall mode.\n *\n * Behaviour:\n * - `scenes` is the raw list (newest-first) returned by `scenesEndpoint`. Updated on poll.\n * - On hard reload: rotation order = scenes order; `activeScene` starts at scenes[0].\n * - On 10s rotation tick: advance to the next id in `playOrder`, wrapping at the end.\n * - When poll detects new ids: insert them right after the currently displayed scene\n * in `playOrder`, jump display to the first new scene (interrupt), and reset the\n * rotation timer so the new scene gets a full cycle. Thumbnail order (= scenes\n * array) keeps showing newest first — the rotation order is independent.\n * - Deleted scenes are pruned from `playOrder`.\n */\nexport function useWallScenes(opts?: UseWallScenesOptions): UseWallScenesResult {\n const scenesEndpoint = opts?.scenesEndpoint ?? '/api/wall-scenes';\n const pollMs = opts?.pollMs ?? 10000;\n const rotationMs = opts?.rotationMs ?? 10000;\n\n const [scenes, setScenes] = useState([]);\n const [activeSceneId, setActiveSceneId] = useState(null);\n\n const playOrderRef = useRef([]);\n const seenIdsRef = useRef>(new Set());\n const activeSceneIdRef = useRef(null);\n const rotationTimerRef = useRef | null>(null);\n const scenePollRef = useRef | null>(null);\n\n const setActiveSceneIdSync = useCallback((id: string | null) => {\n activeSceneIdRef.current = id;\n setActiveSceneId(id);\n }, []);\n\n const startRotation = useCallback(() => {\n if (rotationMs <= 0) return;\n if (rotationTimerRef.current) clearInterval(rotationTimerRef.current);\n rotationTimerRef.current = setInterval(() => {\n const order = playOrderRef.current;\n if (order.length <= 1) return;\n const current = activeSceneIdRef.current;\n const idx = current ? order.indexOf(current) : -1;\n const next = order[(idx + 1) % order.length];\n activeSceneIdRef.current = next;\n setActiveSceneId(next);\n }, rotationMs);\n }, [rotationMs]);\n\n const refresh = useCallback(async () => {\n try {\n const res = await fetch(scenesEndpoint, { cache: 'no-store' });\n const data: { scenes?: WallScene[] } = await res.json();\n const newScenes = data.scenes ?? [];\n setScenes(newScenes);\n\n const allIds = newScenes.map(s => s.id);\n const existingIdSet = new Set(allIds);\n\n if (seenIdsRef.current.size === 0) {\n // First load: rotation order = scenes order (newest-first).\n playOrderRef.current = allIds.slice();\n seenIdsRef.current = new Set(allIds);\n if (allIds.length > 0) {\n setActiveSceneIdSync(allIds[0]);\n startRotation();\n }\n } else {\n const newIds = allIds.filter(id => !seenIdsRef.current.has(id));\n const cleanedOrder = playOrderRef.current.filter(id =>\n existingIdSet.has(id),\n );\n\n if (newIds.length > 0) {\n // Insert new ids right after the currently displayed scene, then\n // interrupt rotation by jumping to the first new id.\n const currentId = activeSceneIdRef.current;\n const insertAfter = currentId\n ? cleanedOrder.indexOf(currentId)\n : -1;\n const head = cleanedOrder.slice(0, insertAfter + 1);\n const tail = cleanedOrder.slice(insertAfter + 1);\n playOrderRef.current = [...head, ...newIds, ...tail];\n newIds.forEach(id => seenIdsRef.current.add(id));\n setActiveSceneIdSync(newIds[0]);\n startRotation(); // reset timer so the new scene gets a full cycle\n } else {\n playOrderRef.current = cleanedOrder;\n // If the active scene was deleted, fall back to the first one.\n if (\n activeSceneIdRef.current &&\n !existingIdSet.has(activeSceneIdRef.current)\n ) {\n const first = cleanedOrder[0] || null;\n setActiveSceneIdSync(first);\n startRotation();\n }\n }\n }\n } catch {\n /* network errors are silent — we'll retry on the next poll */\n }\n }, [scenesEndpoint, setActiveSceneIdSync, startRotation]);\n\n // Initial fetch + public scene poll.\n useEffect(() => {\n refresh();\n if (pollMs > 0) {\n scenePollRef.current = setInterval(() => {\n refresh();\n }, pollMs);\n }\n return () => {\n if (scenePollRef.current) clearInterval(scenePollRef.current);\n };\n }, [refresh, pollMs]);\n\n // Cleanup rotation timer on unmount.\n useEffect(() => {\n return () => {\n if (rotationTimerRef.current) clearInterval(rotationTimerRef.current);\n };\n }, []);\n\n const setActiveScene = useCallback(\n (id: string) => {\n setActiveSceneIdSync(id);\n startRotation();\n },\n [setActiveSceneIdSync, startRotation],\n );\n\n const activeScene =\n scenes.find(s => s.id === activeSceneId) ?? scenes[0] ?? null;\n const activeSceneIndex = activeScene\n ? scenes.findIndex(s => s.id === activeScene.id)\n : 0;\n\n return {\n scenes,\n activeScene,\n activeSceneIndex,\n setActiveScene,\n refresh,\n };\n}\n"]}