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

export async function findByEntity(entityType, entityId) {
  const [rows] = await pool.query(
    `SELECT c.id, c.entity_type, c.entity_id, c.user_id, u.name AS user_name, c.message, c.edit_version, c.created_at, c.updated_at
     FROM comments c JOIN users u ON u.id = c.user_id
     WHERE c.entity_type = ? AND c.entity_id = ? ORDER BY c.created_at`,
    [entityType, entityId]
  );
  return rows;
}

export async function findById(id) {
  const [rows] = await pool.query(
    `SELECT c.id, c.entity_type, c.entity_id, c.user_id, u.name AS user_name, c.message, c.edit_version, c.created_at, c.updated_at
     FROM comments c JOIN users u ON u.id = c.user_id WHERE c.id = ?`,
    [id]
  );
  return rows[0] || null;
}

export async function update(id, message, editVersion) {
  const [result] = await pool.query('UPDATE comments SET message = ?, edit_version = edit_version + 1 WHERE id = ? AND edit_version = ?', [message, id, editVersion]);
  return result.affectedRows ? findById(id) : null;
}

export async function remove(id) {
  await pool.query('DELETE FROM comments WHERE id = ?', [id]);
}

// Usado al borrar la entidad duena (actividad, proyecto): limpia sus comentarios de paso, ya que
// no hay FK fisica cruzada (entity_type/entity_id es polimorfico) que lo haga por cascada.
export async function removeByEntity(entityType, entityId) {
  await pool.query('DELETE FROM comments WHERE entity_type = ? AND entity_id = ?', [entityType, entityId]);
}

// Usado al convertir una actividad en proyecto: sus comentarios pasan a la actividad nueva que
// hereda sus tareas, en vez de perderse cuando se borra la actividad original.
export async function reassignEntity(entityType, oldEntityId, newEntityId) {
  await pool.query('UPDATE comments SET entity_id = ? WHERE entity_type = ? AND entity_id = ?', [newEntityId, entityType, oldEntityId]);
}

export async function create({ entityType, entityId, userId, message }) {
  const [result] = await pool.query(
    'INSERT INTO comments (entity_type, entity_id, user_id, message) VALUES (?, ?, ?, ?)',
    [entityType, entityId, userId, message]
  );
  return findById(result.insertId);
}