/* B03 다중 파일 업로드 API 클라이언트 */

import { API_BASE_URL, API_TIMEOUT_MS, AUTH_TOKEN_KEY } from "@config/config_frontend";

export interface UploadedFileResult {
  input_file_id: number;
  original_filename: string;
  file_type: string;
  relative_path: string;
  size_bytes: number;
  metadata: Record<string, unknown>;
}

export interface FileUploadResponse {
  status: string;
  project_id: string;
  files: UploadedFileResult[];
}

export async function uploadProjectFiles(
  projectId: string,
  files: readonly File[],
): Promise<FileUploadResponse> {
  const formData = new FormData();
  for (const file of files) formData.append("files", file, file.name);

  const controller = new AbortController();
  const timeoutId = window.setTimeout(() => controller.abort(), API_TIMEOUT_MS);
  const token = localStorage.getItem(AUTH_TOKEN_KEY);
  try {
    const response = await fetch(`${API_BASE_URL}/projects/${projectId}/files`, {
      method: "POST",
      headers: token ? { Authorization: `Bearer ${token}` } : undefined,
      body: formData,
      signal: controller.signal,
    });
    const payload = (await response.json()) as Partial<FileUploadResponse> & {
      message?: string;
    };
    if (!response.ok) {
      throw new Error(payload.message ?? `HTTP ${response.status}`);
    }
    return payload as FileUploadResponse;
  } finally {
    window.clearTimeout(timeoutId);
  }
}