/**
 * dbmsClient.ts
 * -------------
 * Fetches DBMS topic data from the Go backend.
 */

const API_BASE = '';

export interface DBMSTopic {
  id: string;
  topic_no: number;
  topic_name: string;
}

export interface DBMSTopicContent extends DBMSTopic {
  content: string;
}

/**
 * Fetches all DBMS topics (topic_no and topic_name).
 */
export async function fetchDBMSTopics(): Promise<DBMSTopic[]> {
  const res = await fetch(`${API_BASE}/api/dbms/topics`, {
    method: 'GET',
    headers: { 'Content-Type': 'application/json' },
  });

  if (!res.ok) {
    throw new Error(`API error ${res.status}: ${res.statusText}`);
  }

  const data = await res.json() as { topics: DBMSTopic[] };
  return data.topics ?? [];
}

/**
 * Fetches full content for a specific DBMS topic.
 */
export async function fetchDBMSTopicContent(topicNo: number): Promise<DBMSTopicContent> {
  const res = await fetch(`${API_BASE}/api/dbms/topics/${topicNo}`, {
    method: 'GET',
    headers: { 'Content-Type': 'application/json' },
  });

  if (!res.ok) {
    throw new Error(`API error ${res.status}: ${res.statusText}`);
  }

  return await res.json() as DBMSTopicContent;
}