services/utils/pagination.js

async function paginate(queryFn, sql, params, page = 1, pageSize = 20) {
  const p = Math.max(1, parseInt(page) || 1)
  const ps = Math.min(100, Math.max(1, parseInt(pageSize) || 20))

  const countResult = await queryFn(
    `SELECT COUNT(*) as total FROM (${sql}) AS _paged`,
    params
  )
  const total = countResult[0].total
  const totalPages = Math.ceil(total / ps)

  const offset = (p - 1) * ps
  const data = await queryFn(
    `${sql} LIMIT ${ps} OFFSET ${offset}`,
    params
  )

  return { data, total, page: p, pageSize: ps, totalPages }
}

module.exports = { paginate }