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

export interface ListUpcomingAppointmentsInput extends PaginationInput {
  workerId?: string;
}

export async function run(db: ReadonlyDB<DB>, input: ListUpcomingAppointmentsInput) {
  const limit = input.limit ?? DEFAULT_PAGE_SIZE;
  const offset = input.offset ?? 0;
  const now = new Date();

  let query = db.selectFrom("AppointmentHistory").selectAll().where("effectiveDate", ">", now);

  if (input.workerId) {
    query = query.where("workerId", "=", input.workerId);
  }

  // Ordered by effectiveDate ascending — a business rule, not caller-selectable.
  const appointments = await query
    .orderBy("effectiveDate", "asc")
    .limit(limit + 1)
    .offset(offset)
    .execute();

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