// ─── Constants ───────────────────────────────────────────────────────────────

import {
  PlagiarismSubmissionPayload,
  PlagiarismSubmissionResponse,
} from '@/widgets/plagiatCheck/lib/types';

const API_BASE_URL = process.env.VITE_API_BASE_URL ?? '/api';
const ENDPOINT = `${API_BASE_URL}/plagiarism/submit`;

// ─── API Function ────────────────────────────────────────────────────────────

/**
 * Submits a document for plagiarism checking.
 * Sends a multipart/form-data request to the backend API.
 */
export async function submitPlagiarismCheck(
  payload: PlagiarismSubmissionPayload,
): Promise<PlagiarismSubmissionResponse> {
  const formData = new FormData();
  formData.append('topic', payload.topic);
  formData.append('senderFullName', payload.senderFullName);
  formData.append('file', payload.file);
  formData.append('withCertificate', String(payload.withCertificate));

  const response = await fetch(ENDPOINT, {
    method: 'POST',
    body: formData,
    // Do NOT set Content-Type manually — the browser sets it with the boundary
  });

  if (!response.ok) {
    const errorBody = await response.json().catch(() => ({}));
    throw new Error(
      (errorBody as { message?: string }).message ??
        `Request failed with status ${response.status}`,
    );
  }

  return response.json() as Promise<PlagiarismSubmissionResponse>;
}