1 files changed, 178 insertions, 0 deletions
diff --git a/apps/web/src/components/editor/timeline/timeline-action-handlers.tsx b/apps/web/src/components/editor/timeline/timeline-action-handlers.tsx
new file mode 100644
index 00000000..0e7323d3
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+++ b/apps/web/src/components/editor/timeline/timeline-action-handlers.tsx
@@ -0,0 +1,178 @@
+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,
+	};
+}