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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;
// FPS presets for project settings
export const FPS_PRESETS = [
{ value: "24", label: "24 fps (Film)" },
{ value: "25", label: "25 fps (PAL)" },
{ value: "30", label: "30 fps (NTSC)" },
{ value: "60", label: "60 fps (High)" },
{ value: "120", label: "120 fps (Slow-mo)" },
] as const;
// Frame snapping utilities
export function timeToFrame(time: number, fps: number): number {
return Math.round(time * fps);
}
export function frameToTime(frame: number, fps: number): number {
return frame / fps;
}
export function snapTimeToFrame(time: number, fps: number): number {
if (fps <= 0) return time; // Fallback for invalid FPS
const frame = timeToFrame(time, fps);
return frameToTime(frame, fps);
}
export function getFrameDuration(fps: number): number {
return 1 / fps;
}
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