// utils/ctxCache.js
import crypto from "node:crypto";
import pool   from "../config/mysqlPool.js";
import { query } from '../shared/db/withEncryption.js';

/**
 * @param {string} userId
 * @param {string} careerProfileId
 * @param {string} summaryText     ← pre-built summary
 * @returns {string}               ← cached or stored summary
 */
export async function cacheSummary(userId, careerProfileId, summaryText) {
  const hash = crypto.createHash("sha1").update(summaryText).digest("hex");

  // 1. try cache
  const [rows] = await pool.query(
    `SELECT ctx_text FROM context_cache
     WHERE user_id=? AND career_profile_id=? AND ctx_hash=? LIMIT 1`,
    [userId, careerProfileId, hash]
  );
  if (rows[0]) return rows[0].ctx_text;

  // 2. miss → store
  await pool.query(
    `REPLACE INTO context_cache
       (user_id, career_profile_id, ctx_hash, ctx_text)
     VALUES (?,?,?,?)`,
    [userId, careerProfileId, hash, summaryText]
  );
  return summaryText;
}