import type { VendorCompanyRoster } from "@/domain/vendors/types/vendor";
import type { VendorRosterAdditivePatch } from "@/domain/vendors/mappers/vendor-roster-mapper";

export type VendorCompanyNotesBaseline = Pick<
  VendorCompanyRoster,
  "companyId" | "rowVersion" | "notes"
>;

export interface VendorCompanyNotesUpdate {
  companyId: string | number;
  patch: VendorRosterAdditivePatch;
}

/**
 * Company-level notes edited outside the Vendors page (e.g. the Create WO wizard)
 * are written through the additive roster PATCH, which only touches the fields sent.
 * Returns null when nothing changed. Clearing notes is not expressible on that PATCH
 * (blank company fields mean "unchanged"), so an emptied field is not sent.
 */
export function buildCompanyNotesUpdate(
  baseline: VendorCompanyNotesBaseline | null | undefined,
  editedNotes: string,
): VendorCompanyNotesUpdate | null {
  if (!baseline || baseline.companyId === null || !baseline.rowVersion) {
    return null;
  }
  const notes = editedNotes.trim();
  if (!notes || notes === baseline.notes.trim()) {
    return null;
  }
  return {
    companyId: baseline.companyId,
    patch: { rowVersion: baseline.rowVersion, addTechnicians: [], companyFields: { notes } },
  };
}