refactor: move constants to src/constants

1 files changed, 78 insertions, 0 deletions

diff --git a/apps/web/src/constants/timeline-constants.ts b/apps/web/src/constants/timeline-constants.ts
new file mode 100644
index 00000000..26cd865c
--- /dev/null
+++ b/apps/web/src/constants/timeline-constants.ts
@@ -0,0 +1,78 @@
+import type { TrackType } from "@/types/timeline";
+
+// Track color definitions
+export const TRACK_COLORS: Record<
+  TrackType,
+  { solid: string; background: string; border: string }
+> = {
+  media: {
+    solid: "bg-blue-500",
+    background: "bg-blue-500/20",
+    border: "border-white/80",
+  },
+  text: {
+    solid: "bg-[#9C4937]",
+    background: "bg-[#9C4937]",
+    border: "border-white/80",
+  },
+  audio: {
+    solid: "bg-green-500",
+    background: "bg-green-500/20",
+    border: "border-white/80",
+  },
+} as const;
+
+// Utility functions
+export function getTrackColors(type: TrackType) {
+  return TRACK_COLORS[type];
+}
+
+export function getTrackElementClasses(type: TrackType) {
+  const colors = getTrackColors(type);
+  return `${colors.background} ${colors.border}`;
+}
+
+// Track height definitions
+export const TRACK_HEIGHTS: Record<TrackType, number> = {
+  media: 65,
+  text: 25,
+  audio: 50,
+} as const;
+
+// Utility function for track heights
+export function getTrackHeight(type: TrackType): number {
+  return TRACK_HEIGHTS[type];
+}
+
+// Calculate cumulative height up to (but not including) a track index
+export function getCumulativeHeightBefore(
+  tracks: Array<{ type: TrackType }>,
+  trackIndex: number
+): number {
+  const GAP = 4; // 4px gap between tracks (equivalent to Tailwind's gap-1)
+  return tracks
+    .slice(0, trackIndex)
+    .reduce((sum, track) => sum + getTrackHeight(track.type) + GAP, 0);
+}
+
+// Calculate total height of all tracks
+export function getTotalTracksHeight(
+  tracks: Array<{ type: TrackType }>
+): number {
+  const GAP = 4; // 4px gap between tracks (equivalent to Tailwind's gap-1)
+  const tracksHeight = tracks.reduce(
+    (sum, track) => sum + getTrackHeight(track.type),
+    0
+  );
+  const gapsHeight = Math.max(0, tracks.length - 1) * GAP; // n-1 gaps for n tracks
+  return tracksHeight + gapsHeight;
+}
+
+// Other timeline constants
+export const TIMELINE_CONSTANTS = {
+  ELEMENT_MIN_WIDTH: 80,
+  PIXELS_PER_SECOND: 50,
+  TRACK_HEIGHT: 60, // Default fallback
+  DEFAULT_TEXT_DURATION: 5,
+  ZOOM_LEVELS: [0.25, 0.5, 1, 1.5, 2, 3, 4],
+} as const;