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

export interface CreateJobProfileInput {
  code: string;
  jobFamily: string;
  gradeReference: string;
  requirements?: string | null;
}

/**
 * Function: createJobProfile
 * Description: Defines a new role template (job profile) — job family, grade
 * reference, and requirements — that Positions can share as their role
 * definition. Rejects when the code is already used by another JobProfile.
 */
export async function run<CF extends Record<string, unknown>>(
  db: Transaction,
  input: CreateJobProfileInput & CF,
  _ctx: CommandContext,
) {
  const { code, jobFamily, gradeReference, requirements, ...customFields } = input;

  const existing = await db
    .selectFrom("JobProfile")
    .selectAll()
    .where("code", "=", code)
    .forUpdate()
    .executeTakeFirst();
  if (existing) {
    return err(new DuplicateJobProfileCodeError(code));
  }

  const jobProfile = await db
    .insertInto("JobProfile")
    .values({
      ...(customFields as Record<string, unknown>),
      code,
      jobFamily,
      gradeReference,
      requirements: requirements ?? null,
    })
    .returningAll()
    .executeTakeFirstOrThrow();

  return ok({ jobProfile });
}