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import { snapTimeToFrame } from "@/constants/timeline-constants";
import { useProjectStore } from "@/stores/project-store";
import { useState, useEffect, useCallback } from "react";
interface UseTimelinePlayheadProps {
currentTime: number;
duration: number;
zoomLevel: number;
seek: (time: number) => void;
rulerRef: React.RefObject<HTMLDivElement>;
rulerScrollRef: React.RefObject<HTMLDivElement>;
tracksScrollRef: React.RefObject<HTMLDivElement>;
playheadRef?: React.RefObject<HTMLDivElement>;
}
export function useTimelinePlayhead({
currentTime,
duration,
zoomLevel,
seek,
rulerRef,
rulerScrollRef,
tracksScrollRef,
playheadRef,
}: UseTimelinePlayheadProps) {
// Playhead scrubbing state
const [isScrubbing, setIsScrubbing] = useState(false);
const [scrubTime, setScrubTime] = useState<number | null>(null);
// Ruler drag detection state
const [isDraggingRuler, setIsDraggingRuler] = useState(false);
const [hasDraggedRuler, setHasDraggedRuler] = useState(false);
const playheadPosition =
isScrubbing && scrubTime !== null ? scrubTime : currentTime;
// --- Playhead Scrubbing Handlers ---
const handlePlayheadMouseDown = useCallback(
(e: React.MouseEvent) => {
e.preventDefault();
e.stopPropagation(); // Prevent ruler drag from triggering
setIsScrubbing(true);
handleScrub(e);
},
[duration, zoomLevel]
);
// Ruler mouse down handler
const handleRulerMouseDown = useCallback(
(e: React.MouseEvent) => {
// Only handle left mouse button
if (e.button !== 0) return;
// Don't interfere if clicking on the playhead itself
if (playheadRef?.current?.contains(e.target as Node)) return;
e.preventDefault();
setIsDraggingRuler(true);
setHasDraggedRuler(false);
// Start scrubbing immediately
setIsScrubbing(true);
handleScrub(e);
},
[duration, zoomLevel]
);
const handleScrub = useCallback(
(e: MouseEvent | React.MouseEvent) => {
const ruler = rulerRef.current;
if (!ruler) return;
const rect = ruler.getBoundingClientRect();
const x = e.clientX - rect.left;
const rawTime = Math.max(0, Math.min(duration, x / (50 * zoomLevel)));
// Use frame snapping for playhead scrubbing
const projectStore = useProjectStore.getState();
const projectFps = projectStore.activeProject?.fps || 30;
const time = snapTimeToFrame(rawTime, projectFps);
setScrubTime(time);
seek(time); // update video preview in real time
},
[duration, zoomLevel, seek, rulerRef]
);
// Mouse move/up event handlers
useEffect(() => {
if (!isScrubbing) return;
const onMouseMove = (e: MouseEvent) => {
handleScrub(e);
// Mark that we've dragged if ruler drag is active
if (isDraggingRuler) {
setHasDraggedRuler(true);
}
};
const onMouseUp = (e: MouseEvent) => {
setIsScrubbing(false);
if (scrubTime !== null) seek(scrubTime); // finalize seek
setScrubTime(null);
// Handle ruler click vs drag
if (isDraggingRuler) {
setIsDraggingRuler(false);
// If we didn't drag, treat it as a click-to-seek
if (!hasDraggedRuler) {
handleScrub(e);
}
setHasDraggedRuler(false);
}
};
window.addEventListener("mousemove", onMouseMove);
window.addEventListener("mouseup", onMouseUp);
return () => {
window.removeEventListener("mousemove", onMouseMove);
window.removeEventListener("mouseup", onMouseUp);
};
}, [
isScrubbing,
scrubTime,
seek,
handleScrub,
isDraggingRuler,
hasDraggedRuler,
]);
// --- Playhead auto-scroll effect ---
useEffect(() => {
const rulerViewport = rulerScrollRef.current?.querySelector(
"[data-radix-scroll-area-viewport]"
) as HTMLElement;
const tracksViewport = tracksScrollRef.current?.querySelector(
"[data-radix-scroll-area-viewport]"
) as HTMLElement;
if (!rulerViewport || !tracksViewport) return;
const playheadPx = playheadPosition * 50 * zoomLevel; // TIMELINE_CONSTANTS.PIXELS_PER_SECOND = 50
const viewportWidth = rulerViewport.clientWidth;
const scrollMin = 0;
const scrollMax = rulerViewport.scrollWidth - viewportWidth;
// Center the playhead if it's not visible (100px buffer)
const desiredScroll = Math.max(
scrollMin,
Math.min(scrollMax, playheadPx - viewportWidth / 2)
);
if (
playheadPx < rulerViewport.scrollLeft + 100 ||
playheadPx > rulerViewport.scrollLeft + viewportWidth - 100
) {
rulerViewport.scrollLeft = tracksViewport.scrollLeft = desiredScroll;
}
}, [playheadPosition, duration, zoomLevel, rulerScrollRef, tracksScrollRef]);
return {
playheadPosition,
handlePlayheadMouseDown,
handleRulerMouseDown,
isDraggingRuler,
};
}
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