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import { useMemo } from "react";
import { toast } from "sonner";
import { useTimelineStore } from "@/stores/timeline-store";
import { usePlaybackStore } from "@/stores/playback-store";
export function useTimelineActionHandlers() {
const {
tracks,
addElementToTrack,
removeElementFromTrack,
selectedElements,
clearSelectedElements,
splitElement,
splitAndKeepLeft,
splitAndKeepRight,
separateAudio,
} = useTimelineStore();
const { currentTime } = usePlaybackStore();
// Create optimized lookup maps for O(1) access instead of O(n) find operations
const trackMap = useMemo(() => {
const map = new Map();
tracks.forEach((track) => {
map.set(track.id, track);
// Also create element lookup for this track
const elementMap = new Map();
track.elements.forEach((element) => {
elementMap.set(element.id, element);
});
map.set(`${track.id}_elements`, elementMap);
});
return map;
}, [tracks]);
// Helper function for O(1) track/element lookup
const findTrackAndElement = (trackId: string, elementId: string) => {
const track = trackMap.get(trackId);
const elementMap = trackMap.get(`${trackId}_elements`);
const element = elementMap?.get(elementId);
return { track, element };
};
// Action handlers for toolbar
const handleSplitSelected = () => {
if (selectedElements.length === 0) {
toast.error("No elements selected");
return;
}
let splitCount = 0;
selectedElements.forEach(({ trackId, elementId }) => {
const { track, element } = findTrackAndElement(trackId, elementId);
if (element && track) {
const effectiveStart = element.startTime;
const effectiveEnd =
element.startTime +
(element.duration - element.trimStart - element.trimEnd);
if (currentTime > effectiveStart && currentTime < effectiveEnd) {
const newElementId = splitElement(trackId, elementId, currentTime);
if (newElementId) splitCount++;
}
}
});
if (splitCount === 0) {
toast.error("Playhead must be within selected elements to split");
}
};
const handleDuplicateSelected = () => {
if (selectedElements.length === 0) {
toast.error("No elements selected");
return;
}
const canDuplicate = selectedElements.length === 1;
if (!canDuplicate) return;
selectedElements.forEach(({ trackId, elementId }) => {
const { element } = findTrackAndElement(trackId, elementId);
if (element) {
const newStartTime =
element.startTime +
(element.duration - element.trimStart - element.trimEnd) +
0.1;
// Create element without id (will be generated by store)
const { id, ...elementWithoutId } = element;
addElementToTrack(trackId, {
...elementWithoutId,
startTime: newStartTime,
});
// We can't predict the new id, so just clear selection for now
// TODO: addElementToTrack could return the new element id
}
});
clearSelectedElements();
};
const handleFreezeSelected = () => {
toast.info("Freeze frame functionality coming soon!");
};
const handleSplitAndKeepLeft = () => {
if (selectedElements.length !== 1) {
toast.error("Select exactly one element");
return;
}
const { trackId, elementId } = selectedElements[0];
const { element } = findTrackAndElement(trackId, elementId);
if (!element) return;
const effectiveStart = element.startTime;
const effectiveEnd =
element.startTime +
(element.duration - element.trimStart - element.trimEnd);
if (currentTime <= effectiveStart || currentTime >= effectiveEnd) {
toast.error("Playhead must be within selected element");
return;
}
splitAndKeepLeft(trackId, elementId, currentTime);
};
const handleSplitAndKeepRight = () => {
if (selectedElements.length !== 1) {
toast.error("Select exactly one element");
return;
}
const { trackId, elementId } = selectedElements[0];
const { element } = findTrackAndElement(trackId, elementId);
if (!element) return;
const effectiveStart = element.startTime;
const effectiveEnd =
element.startTime +
(element.duration - element.trimStart - element.trimEnd);
if (currentTime <= effectiveStart || currentTime >= effectiveEnd) {
toast.error("Playhead must be within selected element");
return;
}
splitAndKeepRight(trackId, elementId, currentTime);
};
const handleSeparateAudio = () => {
if (selectedElements.length !== 1) {
toast.error("Select exactly one media element to separate audio");
return;
}
const { trackId, elementId } = selectedElements[0];
const { track } = findTrackAndElement(trackId, elementId);
if (!track || track.type !== "media") {
toast.error("Select a media element to separate audio");
return;
}
separateAudio(trackId, elementId);
};
const handleDeleteSelected = () => {
if (selectedElements.length === 0) {
toast.error("No elements selected");
return;
}
selectedElements.forEach(({ trackId, elementId }) => {
removeElementFromTrack(trackId, elementId);
});
clearSelectedElements();
};
return {
handleSplitSelected,
handleDuplicateSelected,
handleFreezeSelected,
handleSplitAndKeepLeft,
handleSplitAndKeepRight,
handleSeparateAudio,
handleDeleteSelected,
};
}
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