export function tvstarTiming(goal: string, shots: Array<{ duration: string }>) {
  if (!shots.length) throw new Error("没有可生成的分镜");
  const duration = /(\d+(?:\.\d+)?)\s*(秒钟|秒|s(?:ec(?:onds?)?)?|分钟|分|min(?:utes?)?)(?![a-z])/gi;
  const requests = goal.split(/[，,。；;\n]/).flatMap(part => {
    if (/(?:镜头\s*[0-9一二三四五六七八九十]+|片段\s*[0-9一二三四五六七八九十]+|(?:镜头|片段)[^，,。；;\n]*各|单段|每段|每个镜头|each\s+(?:shot|clip)|per\s+(?:shot|clip)|(?:shot|clip)\s+\d+|关键帧\s*[0-9一二三四五六七八九十]*)/i.test(part)
      && !/(?:总时长|整体时长|整片|全片|成片时长|片长)/.test(part)) return [];
    return [...part.matchAll(duration)].map(match => {
      const value = Number(match[1]);
      return /^(?:分钟|分|min)/i.test(match[2]) ? value * 60 : value;
    });
  });
  const requested = requests.at(-1) || 0;
  const original = shots.map(shot => {
    const duration = Number.parseFloat(shot.duration);
    return Number.isFinite(duration) && duration > 0 ? duration : 5;
  });
  const sourceTotal = original.reduce((sum, duration) => sum + duration, 0);
  const targetDuration = Math.round((requested || sourceTotal) * 10) / 10;
  if (targetDuration > 300) throw Error("自动成片最长支持 300 秒，请缩短需求或拆分制作");
  if (targetDuration < shots.length * 0.2)
    throw Error("目标时长不足以容纳全部镜头，请减少镜头或增加成片时长");
  const scale = targetDuration / sourceTotal;
  const shotDurations = original.map(duration => Math.max(0.2, Math.round(duration * scale * 10) / 10));
  const excess = Math.round((shotDurations.reduce((sum, duration) => sum + duration, 0) - targetDuration) * 10) / 10;
  shotDurations[shotDurations.length - 1] = Math.max(0.2, Math.round((shotDurations.at(-1)! - excess) * 10) / 10);
  return { targetDuration, shotDurations };
}