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

type TimecardOrderByField = "periodStart";

export interface ListTimecardsByAssignmentInput extends PaginationInput<TimecardOrderByField> {
  assignmentId: string;
}

/**
 * Function: listTimecardsByAssignment
 * Lists a worker's Timecards across periods for a given Assignment, across
 * all statuses, paginated and ordered by periodStart by default.
 */
export async function run(db: ReadonlyDB<DB>, input: ListTimecardsByAssignmentInput) {
  if (!input.assignmentId) {
    return err(new InvalidQueryParamsError("assignmentId"));
  }

  const limit = input.limit ?? DEFAULT_PAGE_SIZE;
  const offset = input.offset ?? 0;
  const orderBy = input.orderBy ?? "periodStart";
  const orderDirection = input.orderDirection ?? "asc";

  const timecards = await db
    .selectFrom("Timecard")
    .selectAll()
    .where("assignmentId", "=", input.assignmentId)
    .orderBy(orderBy, orderDirection)
    .limit(limit + 1)
    .offset(offset)
    .execute();

  return ok(buildPaginatedResult(timecards, limit));
}