export type VideoClipRange = {
  start: number;
  end: number;
};

export const DEFAULT_VIDEO_CLIP_RANGE: VideoClipRange = {
  start: 0,
  end: 1 / 3,
};

export function normalizeVideoClipRange(value: unknown): VideoClipRange {
  if (!value || typeof value !== "object") return DEFAULT_VIDEO_CLIP_RANGE;
  const candidate = value as Partial<VideoClipRange>;
  const start = Number(candidate.start);
  const end = Number(candidate.end);
  if (!Number.isFinite(start) || !Number.isFinite(end)) {
    return DEFAULT_VIDEO_CLIP_RANGE;
  }
  const normalizedStart = Math.max(0, Math.min(start, 0.94));
  const normalizedEnd = Math.max(
    Math.min(normalizedStart + 0.04, 1),
    Math.min(end, 1),
  );
  return {
    start: Number(normalizedStart.toFixed(9)),
    end: Number(normalizedEnd.toFixed(9)),
  };
}

export function snapVideoClipRatio(ratio: number, durationSeconds: number) {
  const duration = Math.max(0.1, Number(durationSeconds) || 0.1);
  return Math.max(0, Math.min(1, Math.round(ratio * duration) / duration));
}

export function getVideoClipDuration(range: VideoClipRange, durationSeconds: number) {
  const normalized = normalizeVideoClipRange(range);
  return Math.max(0.05, (normalized.end - normalized.start) * Math.max(0.1, durationSeconds));
}