export interface SnapOptions {
  enabled: boolean
  pxPerSec: number
  pixelThreshold: number
  duration: number
}

export function snapToCandidates(
  t: number,
  candidates: readonly number[],
  opts: SnapOptions,
): number {
  if (!opts.enabled) return t
  if (opts.pxPerSec <= 0) return t
  const thresholdTime = opts.pixelThreshold / opts.pxPerSec
  let best = t
  let bestDist = thresholdTime
  for (const kt of candidates) {
    const d = Math.abs(kt - t)
    if (d <= bestDist) {
      bestDist = d
      best = kt
    }
  }
  return Math.max(0, Math.min(opts.duration, best))
}