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import { useEffect, useState } from "react";
import { TIMELINE_CONSTANTS } from "@/constants/timeline-constants";
import type { TimelineTrack } from "@/types/timeline";
interface UseSnapIndicatorPositionParams {
snapPoint: { time: number } | null;
zoomLevel: number;
tracks: TimelineTrack[];
timelineRef: React.RefObject<HTMLDivElement | null>;
trackLabelsRef?: React.RefObject<HTMLDivElement | null>;
tracksScrollRef: React.RefObject<HTMLDivElement | null>;
}
interface SnapIndicatorPosition {
leftPosition: number;
topPosition: number;
height: number;
}
export function useSnapIndicatorPosition({
snapPoint,
zoomLevel,
tracks,
timelineRef,
trackLabelsRef,
tracksScrollRef,
}: UseSnapIndicatorPositionParams): SnapIndicatorPosition {
const [scrollLeft, setScrollLeft] = useState(0);
useEffect(() => {
const tracksViewport = tracksScrollRef.current;
if (!tracksViewport) return;
const handleScroll = () => {
setScrollLeft(tracksViewport.scrollLeft);
};
setScrollLeft(tracksViewport.scrollLeft);
tracksViewport.addEventListener("scroll", handleScroll);
return () => tracksViewport.removeEventListener("scroll", handleScroll);
}, [tracksScrollRef]);
const timelineContainerHeight = timelineRef.current?.offsetHeight || 400;
const totalHeight = timelineContainerHeight - 8; // 8px padding from edges
const trackLabelsWidth =
tracks.length > 0 && trackLabelsRef?.current
? trackLabelsRef.current.offsetWidth
: 0;
const timelinePosition =
(snapPoint?.time || 0) * TIMELINE_CONSTANTS.PIXELS_PER_SECOND * zoomLevel;
const leftPosition = trackLabelsWidth + timelinePosition - scrollLeft;
return {
leftPosition,
topPosition: 0,
height: totalHeight,
};
}
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