import type { SupabaseClient } from "@supabase/supabase-js";
import { breadcrumbLabel, loadOrgMaps } from "./org";
import type { Database } from "./supabase/types";

export type OpenPositionResolved = {
  id: string;
  position_number: string;
  title: string;
  team_id: string;
  division_id: string;
  is_lead: boolean;
  reports_to_employee_id: string | null;
  created_at: string;
  managerName: string | null;
  orgLabel: string;
};

// Shared by the Hire Wizard (position lookup) and the Positions & Bereiche page.
export async function loadOpenPositions(supabase: SupabaseClient<Database>): Promise<OpenPositionResolved[]> {
  const orgMaps = await loadOrgMaps(supabase);
  const { data: positions } = await supabase
    .from("positions")
    .select("id, position_number, title, team_id, division_id, is_lead, reports_to_employee_id, created_at")
    .eq("status", "open")
    .order("created_at", { ascending: false });

  const managerIds = Array.from(
    new Set((positions ?? []).map((p) => p.reports_to_employee_id).filter((id): id is string => Boolean(id)))
  );
  const { data: managers } = managerIds.length
    ? await supabase.from("employees_directory").select("id, first_name, last_name").in("id", managerIds)
    : { data: [] as { id: string; first_name: string; last_name: string }[] };
  const managerNameById = new Map((managers ?? []).map((m) => [m.id, `${m.first_name} ${m.last_name}`]));

  return (positions ?? []).map((p) => ({
    ...p,
    managerName: p.reports_to_employee_id ? (managerNameById.get(p.reports_to_employee_id) ?? null) : null,
    orgLabel: breadcrumbLabel(orgMaps, p.division_id, p.team_id),
  }));
}