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"use client";
import { useRef, useState, useEffect } from "react";
import { TimelineTrack } from "@/types/timeline";
import { TIMELINE_CONSTANTS } from "@/constants/timeline-constants";
import { useTimelinePlayhead } from "@/hooks/use-timeline-playhead";
interface TimelinePlayheadProps {
currentTime: number;
duration: number;
zoomLevel: number;
tracks: TimelineTrack[];
seek: (time: number) => void;
rulerRef: React.RefObject<HTMLDivElement>;
rulerScrollRef: React.RefObject<HTMLDivElement>;
tracksScrollRef: React.RefObject<HTMLDivElement>;
trackLabelsRef?: React.RefObject<HTMLDivElement>;
timelineRef: React.RefObject<HTMLDivElement>;
playheadRef?: React.RefObject<HTMLDivElement>;
isSnappingToPlayhead?: boolean;
}
export function TimelinePlayhead({
currentTime,
duration,
zoomLevel,
tracks,
seek,
rulerRef,
rulerScrollRef,
tracksScrollRef,
trackLabelsRef,
timelineRef,
playheadRef: externalPlayheadRef,
isSnappingToPlayhead = false,
}: TimelinePlayheadProps) {
const internalPlayheadRef = useRef<HTMLDivElement>(null);
const playheadRef = externalPlayheadRef || internalPlayheadRef;
const [scrollLeft, setScrollLeft] = useState(0);
const { playheadPosition, handlePlayheadMouseDown } = useTimelinePlayhead({
currentTime,
duration,
zoomLevel,
seek,
rulerRef,
rulerScrollRef,
tracksScrollRef,
playheadRef,
});
// Track scroll position to lock playhead to frame
useEffect(() => {
const tracksViewport = tracksScrollRef.current?.querySelector(
"[data-radix-scroll-area-viewport]"
) as HTMLElement;
if (!tracksViewport) return;
const handleScroll = () => {
setScrollLeft(tracksViewport.scrollLeft);
};
// Set initial scroll position
setScrollLeft(tracksViewport.scrollLeft);
tracksViewport.addEventListener("scroll", handleScroll);
return () => tracksViewport.removeEventListener("scroll", handleScroll);
}, [tracksScrollRef]);
// Use timeline container height minus a few pixels for breathing room
const timelineContainerHeight = timelineRef.current?.offsetHeight || 400;
const totalHeight = timelineContainerHeight - 8; // 8px padding from edges
// Get dynamic track labels width, fallback to 0 if no tracks or no ref
const trackLabelsWidth =
tracks.length > 0 && trackLabelsRef?.current
? trackLabelsRef.current.offsetWidth
: 0;
// Calculate position locked to timeline content (accounting for scroll)
const timelinePosition =
playheadPosition * TIMELINE_CONSTANTS.PIXELS_PER_SECOND * zoomLevel;
const rawLeftPosition = trackLabelsWidth + timelinePosition - scrollLeft;
// Get the timeline content width and viewport width for right boundary
const timelineContentWidth =
duration * TIMELINE_CONSTANTS.PIXELS_PER_SECOND * zoomLevel;
const tracksViewport = tracksScrollRef.current?.querySelector(
"[data-radix-scroll-area-viewport]"
) as HTMLElement;
const viewportWidth = tracksViewport?.clientWidth || 1000;
// Constrain playhead to never appear outside the timeline area
const leftBoundary = trackLabelsWidth;
const rightBoundary = Math.min(
trackLabelsWidth + timelineContentWidth - scrollLeft, // Don't go beyond timeline content
trackLabelsWidth + viewportWidth // Don't go beyond viewport
);
const leftPosition = Math.max(
leftBoundary,
Math.min(rightBoundary, rawLeftPosition)
);
// Debug logging when playhead might go outside
if (rawLeftPosition < leftBoundary || rawLeftPosition > rightBoundary) {
console.log(
"PLAYHEAD VISUAL DEBUG:",
JSON.stringify({
playheadPosition,
timelinePosition,
trackLabelsWidth,
scrollLeft,
rawLeftPosition,
constrainedLeftPosition: leftPosition,
leftBoundary,
rightBoundary,
timelineContentWidth,
viewportWidth,
zoomLevel,
})
);
}
return (
<div
ref={playheadRef}
className="absolute pointer-events-auto z-150"
style={{
left: `${leftPosition}px`,
top: 0,
height: `${totalHeight}px`,
width: "2px", // Slightly wider for better click target
}}
onMouseDown={handlePlayheadMouseDown}
>
{/* The playhead line spanning full height */}
<div
className={`absolute left-0 w-0.5 cursor-col-resize h-full ${isSnappingToPlayhead ? "bg-primary" : "bg-foreground"}`}
/>
{/* Playhead dot indicator at the top (in ruler area) */}
<div
className={`absolute top-1 left-1/2 transform -translate-x-1/2 w-3 h-3 rounded-full border-2 shadow-xs ${isSnappingToPlayhead ? "bg-primary border-primary" : "bg-foreground border-foreground"}`}
/>
</div>
);
}
// Also export a hook for getting ruler handlers
export function useTimelinePlayheadRuler({
currentTime,
duration,
zoomLevel,
seek,
rulerRef,
rulerScrollRef,
tracksScrollRef,
playheadRef,
}: Omit<TimelinePlayheadProps, "tracks" | "trackLabelsRef" | "timelineRef">) {
const { handleRulerMouseDown, isDraggingRuler } = useTimelinePlayhead({
currentTime,
duration,
zoomLevel,
seek,
rulerRef,
rulerScrollRef,
tracksScrollRef,
playheadRef,
});
return { handleRulerMouseDown, isDraggingRuler };
}
export { TimelinePlayhead as default };
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