import { err, ok, type ReadonlyDB } from "@tailor-platform/erp-kit/core";
import type { DB } from "../generated/kysely-tailordb";
import { CompanyHolidayNotFoundError } from "../lib/errors.generated";

export interface GetCompanyHolidayInput {
  id: string;
}

/**
 * Function: getCompanyHoliday
 * Description: Retrieves a single CompanyHoliday record by its surrogate id,
 * returning the holiday date, its normalized holidayKind, and name.
 */
export async function run(db: ReadonlyDB<DB>, input: GetCompanyHolidayInput) {
  const companyHoliday = await db
    .selectFrom("CompanyHoliday")
    .selectAll()
    .where("id", "=", input.id)
    .executeTakeFirst();

  if (!companyHoliday) {
    return err(new CompanyHolidayNotFoundError(input.id));
  }

  return ok({ companyHoliday });
}