import { LlmProvider, normalizeLlmProvider } from './llmProvider';

export interface SubtitleRequestBody {
  provider?: string | null;
  targetLanguage?: string | null;
  fileId?: string | null;
}

export interface ParsedSubtitleRequest {
  provider: LlmProvider;
  targetLanguage: string;
  fileId?: string;
}

export const parseSubtitleRequest = (
  body: SubtitleRequestBody,
): ParsedSubtitleRequest => {
  const targetLanguage = body.targetLanguage?.trim();
  if (!targetLanguage) {
    throw new Error('Target language is required.');
  }

  return {
    provider: normalizeLlmProvider(body.provider),
    targetLanguage,
    ...(body.fileId?.trim() ? { fileId: body.fileId.trim() } : {}),
  };
};