import { pool } from '../pool.js';

export async function create(from_type, from_id, to_type, to_id, relation = 'attached') {
  const { rows: [r] } = await pool.query(
    `INSERT INTO entity_links(from_type, from_id, to_type, to_id, relation)
     VALUES($1,$2,$3,$4,$5)
     ON CONFLICT (from_type, from_id, to_type, to_id, relation)
       DO UPDATE SET relation=EXCLUDED.relation
     RETURNING *`,
    [from_type, from_id, to_type, to_id, relation]
  );
  return r;
}

export async function listFrom(from_type, from_id) {
  const { rows } = await pool.query(
    `SELECT * FROM entity_links WHERE from_type=$1 AND from_id=$2`,
    [from_type, from_id]
  );
  return rows;
}

export async function listTo(to_type, to_id) {
  const { rows } = await pool.query(
    `SELECT * FROM entity_links WHERE to_type=$1 AND to_id=$2`,
    [to_type, to_id]
  );
  return rows;
}

export async function remove(id) {
  await pool.query(`DELETE FROM entity_links WHERE id=$1`, [id]);
}