| 1 | import { useEffect, useRef } from "react"; |
| 2 | |
| 3 | import { type PlateSlide } from "@/components/notebook/presentation/utils/parser"; |
| 4 | import { usePresentationState } from "@/states/presentation-state"; |
| 5 | import { useDebouncedSave } from "./useDebouncedSave"; |
| 6 | |
| 7 | interface UseSlideChangeWatcherOptions { |
| 8 | /** |
| 9 | * The delay in milliseconds before triggering a save. |
| 10 | * @default 1000 |
| 11 | */ |
| 12 | debounceDelay?: number; |
| 13 | /** |
| 14 | * Whether the watcher should be active |
| 15 | * @default true |
| 16 | */ |
| 17 | enabled?: boolean; |
| 18 | } |
| 19 | |
| 20 | /** |
| 21 | * A hook that watches for changes to the slides and triggers |
| 22 | * a debounced save function whenever changes are detected. |
| 23 | */ |
| 24 | export const useSlideChangeWatcher = ( |
| 25 | options: UseSlideChangeWatcherOptions = {}, |
| 26 | ) => { |
| 27 | const { debounceDelay = 1000, enabled = true } = options; |
| 28 | const currentPresentationId = usePresentationState( |
| 29 | (s) => s.currentPresentationId, |
| 30 | ); |
| 31 | const contentVersion = usePresentationState((s) => s.contentVersion); |
| 32 | const slides = usePresentationState((s) => s.slides); |
| 33 | const { save, saveImmediately } = useDebouncedSave({ delay: debounceDelay }); |
| 34 | |
| 35 | const baselineKeyRef = useRef<string | null>(null); |
| 36 | const prevSlidesRef = useRef<PlateSlide[]>([]); |
| 37 | |
| 38 | // Watch for changes to the slides array and trigger save |
| 39 | useEffect(() => { |
| 40 | if (!enabled) { |
| 41 | return; |
| 42 | } |
| 43 | const { isGeneratingPresentation } = usePresentationState.getState(); |
| 44 | if (isGeneratingPresentation) { |
| 45 | return; |
| 46 | } |
| 47 | |
| 48 | if (!currentPresentationId || slides.length === 0) { |
| 49 | baselineKeyRef.current = null; |
| 50 | prevSlidesRef.current = slides; |
| 51 | return; |
| 52 | } |
| 53 | |
| 54 | const nextBaselineKey = `${currentPresentationId}:${contentVersion}`; |
| 55 | if (baselineKeyRef.current !== nextBaselineKey) { |
| 56 | baselineKeyRef.current = nextBaselineKey; |
| 57 | prevSlidesRef.current = slides; |
| 58 | return; |
| 59 | } |
| 60 | |
| 61 | if (JSON.stringify(slides) === JSON.stringify(prevSlidesRef.current)) { |
| 62 | return; |
| 63 | } |
| 64 | |
| 65 | prevSlidesRef.current = slides; |
| 66 | save(); |
| 67 | }, [contentVersion, currentPresentationId, enabled, save, slides]); |
| 68 | |
| 69 | return { |
| 70 | saveImmediately, |
| 71 | }; |
| 72 | }; |
| 73 |