From bb65d4fb96d3726448100ea8d95e5eab92e6ddba Mon Sep 17 00:00:00 2001
From: Maze Winther <mazewinther@gmail.com>
Date: Thu, 10 Jul 2025 23:55:08 +0200
Subject: refactor: timeline playhead component and hook

---
 .../src/components/editor/timeline-playhead.tsx    | 125 +++++++++++++++++++++
 1 file changed, 125 insertions(+)
 create mode 100644 apps/web/src/components/editor/timeline-playhead.tsx

(limited to 'apps/web/src/components/editor/timeline-playhead.tsx')

diff --git a/apps/web/src/components/editor/timeline-playhead.tsx b/apps/web/src/components/editor/timeline-playhead.tsx
new file mode 100644
index 00000000..51dab0f3
--- /dev/null
+++ b/apps/web/src/components/editor/timeline-playhead.tsx
@@ -0,0 +1,125 @@
+"use client";
+
+import { TimelineTrack } from "@/types/timeline";
+import {
+  TIMELINE_CONSTANTS,
+  getTotalTracksHeight,
+} 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>;
+}
+
+export function TimelinePlayhead({
+  currentTime,
+  duration,
+  zoomLevel,
+  tracks,
+  seek,
+  rulerRef,
+  rulerScrollRef,
+  tracksScrollRef,
+}: TimelinePlayheadProps) {
+  const { playheadPosition, handlePlayheadMouseDown } = useTimelinePlayhead({
+    currentTime,
+    duration,
+    zoomLevel,
+    seek,
+    rulerRef,
+    rulerScrollRef,
+    tracksScrollRef,
+  });
+
+  return (
+    <>
+      {/* Playhead in ruler (scrubbable) */}
+      <div
+        className="playhead absolute top-0 bottom-0 w-0.5 bg-red-500 pointer-events-auto z-50 cursor-col-resize"
+        style={{
+          left: `${playheadPosition * TIMELINE_CONSTANTS.PIXELS_PER_SECOND * zoomLevel}px`,
+        }}
+        onMouseDown={handlePlayheadMouseDown}
+      >
+        <div className="absolute top-1 left-1/2 transform -translate-x-1/2 w-3 h-3 bg-red-500 rounded-full border-2 border-white shadow-sm" />
+      </div>
+    </>
+  );
+}
+
+interface TimelinePlayheadTracksProps {
+  currentTime: number;
+  duration: number;
+  zoomLevel: number;
+  tracks: TimelineTrack[];
+  seek: (time: number) => void;
+  rulerRef: React.RefObject<HTMLDivElement>;
+  rulerScrollRef: React.RefObject<HTMLDivElement>;
+  tracksScrollRef: React.RefObject<HTMLDivElement>;
+}
+
+export function TimelinePlayheadTracks({
+  currentTime,
+  duration,
+  zoomLevel,
+  tracks,
+  seek,
+  rulerRef,
+  rulerScrollRef,
+  tracksScrollRef,
+}: TimelinePlayheadTracksProps) {
+  const { playheadPosition, handlePlayheadMouseDown } = useTimelinePlayhead({
+    currentTime,
+    duration,
+    zoomLevel,
+    seek,
+    rulerRef,
+    rulerScrollRef,
+    tracksScrollRef,
+  });
+
+  if (tracks.length === 0) return null;
+
+  return (
+    <div
+      className="absolute top-0 w-0.5 bg-red-500 pointer-events-auto z-50 cursor-col-resize"
+      style={{
+        left: `${playheadPosition * TIMELINE_CONSTANTS.PIXELS_PER_SECOND * zoomLevel}px`,
+        height: `${getTotalTracksHeight(tracks)}px`,
+      }}
+      onMouseDown={handlePlayheadMouseDown}
+    />
+  );
+}
+
+// Also export a hook for getting ruler handlers
+export function useTimelinePlayheadRuler({
+  currentTime,
+  duration,
+  zoomLevel,
+  seek,
+  rulerRef,
+  rulerScrollRef,
+  tracksScrollRef,
+}: Omit<TimelinePlayheadProps, "tracks" | "dynamicTimelineWidth">) {
+  const { handleRulerMouseDown, isDraggingRuler } = useTimelinePlayhead({
+    currentTime,
+    duration,
+    zoomLevel,
+    seek,
+    rulerRef,
+    rulerScrollRef,
+    tracksScrollRef,
+  });
+
+  return { handleRulerMouseDown, isDraggingRuler };
+}
+
+export { TimelinePlayhead as default };
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