/* B03 다중 파일 업로드 API 클라이언트 */

import { API_BASE_URL, API_TIMEOUT_MS } 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 interface ChunkSessionCreateResponse {
  status: string;
  project_id: string;
  upload_session_id: string;
  original_filename: string;
  file_size_bytes: number;
  chunk_size_bytes: number;
  total_chunks: number;
  completed_chunks: number;
}

export interface ChunkUploadResponse {
  status: string;
  upload_session_id: string;
  chunk_index: number;
  completed_chunks: number;
  total_chunks: number;
  chunk_hash: string;
}

export interface UploadStatusResponse {
  status: string;
  upload_session_id: string;
  upload_status: string;
  original_filename: string;
  file_size_bytes: number;
  chunk_size_bytes: number;
  total_chunks: number;
  completed_chunks: number;
  completed_chunk_indexes: number[];
}

async function readJsonOrThrow<T>(response: Response): Promise<T> {
  const payload = (await response.json()) as T & { message?: string };
  if (!response.ok) {
    throw new Error(payload.message ?? `HTTP ${response.status}`);
  }
  return payload;
}

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);
  try {
    const response = await fetch(`${API_BASE_URL}/projects/${projectId}/files`, {
      method: "POST",
      credentials: "include",
      body: formData,
      signal: controller.signal,
    });
    return await readJsonOrThrow<FileUploadResponse>(response);
  } finally {
    window.clearTimeout(timeoutId);
  }
}

export async function createUploadSession(
  projectId: string,
  file: File,
  chunkSizeBytes: number,
): Promise<ChunkSessionCreateResponse> {
  const response = await fetch(`${API_BASE_URL}/projects/${projectId}/upload-sessions`, {
    method: "POST",
    credentials: "include",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({
      original_filename: file.name,
      size_bytes: file.size,
      chunk_size_bytes: chunkSizeBytes,
    }),
  });
  return await readJsonOrThrow<ChunkSessionCreateResponse>(response);
}

export async function uploadFileChunk(
  projectId: string,
  sessionId: string,
  chunkIndex: number,
  chunk: Blob,
): Promise<ChunkUploadResponse> {
  const formData = new FormData();
  formData.append("session_id", sessionId);
  formData.append("chunk_index", String(chunkIndex));
  formData.append("chunk_data", chunk, `${sessionId}-${chunkIndex}.chunk`);

  const response = await fetch(`${API_BASE_URL}/projects/${projectId}/chunks`, {
    method: "POST",
    credentials: "include",
    body: formData,
  });
  return await readJsonOrThrow<ChunkUploadResponse>(response);
}

export async function finalizeUploadSession(
  projectId: string,
  sessionId: string,
  totalChunks: number,
): Promise<FileUploadResponse> {
  const response = await fetch(`${API_BASE_URL}/projects/${projectId}/finalize`, {
    method: "POST",
    credentials: "include",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ session_id: sessionId, total_chunks: totalChunks }),
  });
  return await readJsonOrThrow<FileUploadResponse>(response);
}

export async function fetchUploadStatus(
  projectId: string,
  sessionId: string,
): Promise<UploadStatusResponse> {
  const response = await fetch(`${API_BASE_URL}/projects/${projectId}/upload-status/${sessionId}`, {
    method: "GET",
    credentials: "include",
  });
  return await readJsonOrThrow<UploadStatusResponse>(response);
}

export interface WF1AnalysisStatus {
  project_id: string;
  status: "pending" | "in_progress" | "completed" | "failed";
  model_count: number;
  progress_percent: number;
  current_stage: string;
  message: string;
  error?: string;
}

export async function checkWF1AnalysisStatus(projectId: string): Promise<WF1AnalysisStatus> {
  const response = await fetch(`${API_BASE_URL}/projects/${projectId}/surface/status`, {
    method: "GET",
    credentials: "include",
  });
  return await readJsonOrThrow<WF1AnalysisStatus>(response);
}