import {
  buildPaginatedResult,
  DEFAULT_PAGE_SIZE,
  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";

export interface ListCalculatedBlocksByWorkDateInput extends PaginationInput {
  assignmentId: string;
  workDate: Date;
}

/**
 * Function: listCalculatedBlocksByWorkDate
 * Description: Lists the CalculatedTimeBlocks for a given Assignment on a
 * single workday, paginated. This is the primary way to inspect "what did
 * calculation produce for this worker on this day" — the categorized
 * (regular/overtime/late-night/holiday/premium) breakdown of a day's derived
 * time.
 */
export async function run(db: ReadonlyDB<DB>, input: ListCalculatedBlocksByWorkDateInput) {
  if (!input.assignmentId) {
    return err(new InvalidQueryParamsError("assignmentId is missing"));
  }

  if (!input.workDate || Number.isNaN(input.workDate.getTime())) {
    return err(new InvalidQueryParamsError(`workDate=${String(input.workDate)}`));
  }

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

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

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