pipeline/packages/shared/src/llm/detect-input.ts

import { VideoInputSchema } from "../types/scene.js";
import type { VideoInput } from "../types/scene.js";

export type InputFormat = "valid-schema" | "invalid-json" | "non-json";

export interface DetectResult {
  format: InputFormat;
  parsed?: VideoInput;
}

export function detectInputFormat(text: string): DetectResult {
  let parsed: unknown;
  try {
    parsed = JSON.parse(text);
  } catch {
    return { format: "non-json" };
  }

  const result = VideoInputSchema.safeParse(parsed);
  if (result.success) {
    return { format: "valid-schema", parsed: result.data };
  }

  return { format: "invalid-json" };
}