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/**
 * osClient.ts
 * -----------
 * Fetches Operating System topic data from the Go backend.
 */

const API_BASE = '';

export interface OSSection {
  section_no: number;
  section: string;
  topic_count: number;
  level: string;
}

export interface OSTopic {
  id: string;
  section: string;
  topic: string;
  type: string;
  subtopic?: string;
  content: Record<string, any>;
}

/**
 * Fetches all OS sections (grouped, deduplicated list).
 */
export async function fetchOSSections(): Promise<OSSection[]> {
  const res = await fetch(`${API_BASE}/api/os/sections`, {
    method: 'GET',
    headers: { 'Content-Type': 'application/json' },
  });
  if (!res.ok) throw new Error(`OS sections fetch failed: ${res.status}`);
  const data = await res.json();
  return data.sections ?? [];
}

/**
 * Fetches all topics for a given OS section number.
 */
export async function fetchOSSectionContent(sectionNo: number): Promise<{ section: string; topics: OSTopic[] }> {
  const res = await fetch(`${API_BASE}/api/os/sections/${sectionNo}`, {
    method: 'GET',
    headers: { 'Content-Type': 'application/json' },
  });
  if (!res.ok) throw new Error(`OS section content fetch failed: ${res.status}`);
  return res.json();
}