// TODO : test title and date are valid matches to columns in the database
const validSortParams = ["title", "date"];
const validSortDirs = ["asc", "desc"];
const validFilterParams = [
  "movie",
  "show",
  "seeding",
  "downloading",
  "paused",
  "finished",
  "downloaded"
];

function validSort(by, direction) {
  return new Promise((resolve, reject) => {
    if (by === undefined) {
      resolve();
    }

    if (validSortParams.includes(by) && validSortDirs.includes(direction)) {
      resolve();
    } else {
      reject(
        new Error(
          `invalid sort parameter, must be of: ${validSortParams} with optional sort directions: ${validSortDirs} appended with ':'`
        )
      );
    }
  });
}

function validFilter(filterParam) {
  return new Promise((resolve, reject) => {
    if (filterParam === undefined) {
      resolve();
    }

    if (filterParam && validFilterParams.includes(filterParam)) {
      resolve();
    } else {
      reject(
        new Error(`filter parameteres must be of type: ${validFilterParams}`)
      );
    }
  });
}

module.exports = { validSort, validFilter };