import type { PlatformApiClient } from "../api/client";
import type { ServerFileDownloadResponse } from "../api/types";
import { downloadArtifactReference, safeArtifactFilename, saveArtifactBlob } from "./artifactTransfer";

export async function downloadServerFileResult(client: PlatformApiClient, result: ServerFileDownloadResponse): Promise<string> {
  if (result.status !== "ready") {
    return result.reason ?? "文件读取任务已派发，完成后可再次下载。";
  }
  if (result.content !== undefined) {
    saveArtifactBlob(new Blob([result.content], { type: result.contentType ?? "text/plain;charset=utf-8" }), result.filename || "server-file.txt");
    return `下载已开始：${result.filename || result.key}`;
  }
  if (!result.artifact) {
    return "文件内容尚未可用。";
  }
  await downloadArtifactReference(result.artifact, (artifactId) => client.downloadArtifactContent(artifactId));
  return `下载已开始：${safeArtifactFilename(result.filename || result.artifact.filename)}`;
}