import { type EditPlan, editPlanSchema, planTimeline, SECOND } from "./contract";
import { materialize, probeMedia } from "./local";
import { renderEditPlan } from "./render";

// Shared by the local compatibility path and the isolated render service.
export async function renderJob(
  value: EditPlan,
  userId: string,
  dir: string,
  progress: (stage: string) => Promise<void>,
) {
  const plan = editPlanSchema.parse(value);
  planTimeline(plan);
  if (plan.assets.reduce((n, a) => n + a.duration, 0) > 1800 * SECOND)
    throw Error("素材与分离音轨总时长不能超过 30 分钟");
  const files: Record<string, string> = {};
  for (const asset of plan.assets) {
    await progress("读取原始素材");
    const media = await materialize(asset.url, userId),
      actual = await probeMedia(media.file);
    if (
      media.hash !== asset.hash ||
      Math.abs(actual.duration - asset.duration) > 100000 ||
      actual.hasAudio !== asset.hasAudio ||
      actual.width !== asset.width ||
      actual.height !== asset.height
    )
      throw Error("素材内容或参数已变化，请重新生成剪辑方案");
    files[asset.id] = media.file;
  }
  let musicFile: string | undefined;
  if (plan.music) {
    const media = await materialize(plan.music.url, userId),
      meta = await probeMedia(media.file);
    if (!meta.hasAudio || plan.music.start >= meta.duration)
      throw Error("背景音乐或起始时间无效");
    musicFile = media.file;
  }
  const rendered = await renderEditPlan(plan, files, musicFile, dir, progress);
  const actual = await probeMedia(rendered.file, 300.2);
  if (Math.abs(actual.duration / SECOND - rendered.duration) > 0.15)
    throw Error("导出时长与剪辑方案不一致，未发布结果");
  return { ...rendered, duration: actual.duration / SECOND };
}