src/vectorstore.js

import { readFileSync, writeFileSync, existsSync } from 'node:fs';
import { config } from './config.js';
import { cosine } from './embeddings.js';

// Vetor store simples em arquivo JSON: { items: [{ id, text, source, vector }] }
export function load() {
  if (!existsSync(config.storePath)) return { items: [] };
  return JSON.parse(readFileSync(config.storePath, 'utf8'));
}

export function save(store) {
  writeFileSync(config.storePath, JSON.stringify(store));
}

export function search(store, queryVector, k = config.topK) {
  return store.items
    .map((it) => ({ ...it, score: cosine(queryVector, it.vector) }))
    .sort((a, b) => b.score - a.score)
    .slice(0, k);
}