import { err, ok, type CommandContext } from "@tailor-platform/erp-kit/core";
import type { Transaction } from "../generated/kysely-tailordb";
import { JobProfileInUseError, JobProfileNotFoundError } from "../lib/errors.generated";

export interface DeleteJobProfileInput {
  id: string;
}

/**
 * Function: deleteJobProfile
 * Description: Removes a JobProfile role template that is not referenced by
 * any Position — a role template is only safe to remove once no seat depends
 * on it. Since JobProfile is not effective-dated, deletion is a hard delete.
 */
export async function run(db: Transaction, input: DeleteJobProfileInput, _ctx: CommandContext) {
  const jobProfile = await db
    .selectFrom("JobProfile")
    .selectAll()
    .where("id", "=", input.id)
    .forUpdate()
    .executeTakeFirst();
  if (!jobProfile) {
    return err(new JobProfileNotFoundError(input.id));
  }

  const referencingPosition = await db
    .selectFrom("Position")
    .selectAll()
    .where("jobProfileId", "=", input.id)
    .executeTakeFirst();
  if (referencingPosition) {
    return err(new JobProfileInUseError(input.id));
  }

  await db.deleteFrom("JobProfile").where("id", "=", input.id).execute();

  return ok({});
}