'use strict';

function index(data, security) {
  const rowPredicate = security?.row ?? (() => true);
  const columnPredicate = security?.column ?? (() => true);
  return function(context) {
    if (typeof security?.row === "undefined" && typeof security?.column === "undefined")
      return data;
    let filtered = [];
    for (let row of data) {
      if (!rowPredicate(row, context))
        continue;
      let cols = columnPredicate(row, context);
      if (cols === true) {
        filtered.push(row);
        continue;
      }
      let transformed = {};
      for (const [col, val] of Object.entries(row)) {
        if (!cols.has(col))
          continue;
        transformed[col] = val;
      }
      filtered.push(transformed);
    }
    return filtered;
  };
}

module.exports = index;