import { Suspense } from "react";
import { OrgChartClient } from "@/components/orgchart/OrgChartClient";
import type { OrgUnitNode } from "@/components/orgchart/types";
import { todayIso } from "@/lib/format";
import { loadOrgAsOf } from "@/lib/orgchart-data";
import { parseIsoDateParam } from "@/lib/reports";
import { currentUserId } from "@/lib/auth/session";
import { withUser } from "@/lib/db";

type SearchParams = { asOf?: string; focus?: string };

const UUID = /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i;

export default async function OrgChartPage({ searchParams }: { searchParams: Promise<SearchParams> }) {
  const params = await searchParams;
  const today = todayIso();
  const asOf = parseIsoDateParam(params.asOf) ?? today;
  // Only ever used to match against ids already on the page, but validated
  // so a junk value can't reach the client as an arbitrary string.
  const focusId = params.focus && UUID.test(params.focus) ? params.focus : null;

  const { org, units } = await withUser(await currentUserId(), async (tx) => {
    const [org, units] = await Promise.all([
      loadOrgAsOf(tx, asOf),
      tx
        .selectFrom("org_units")
        // valid_from/valid_to nur hier: die Angaben zur Einheit zeigen sie,
        // der Druck braucht sie nicht.
        .select(["id", "org_number", "name", "parent_id", "unit_type", "valid_from", "valid_to"])
        // Zum Stichtag — sonst zeigt die Struktursicht zum 01.01.2020
        // Einheiten, die es damals nicht gab (D.06).
        .where("valid_from", "<=", asOf)
        .where((eb) => eb.or([eb("valid_to", "is", null), eb("valid_to", ">", asOf)]))
        .orderBy("org_number")
        .execute(),
    ]);
    return { org, units };
  });

  return (
    <Suspense>
      <OrgChartClient
        employees={org.employees}
        units={units as OrgUnitNode[]}
        vacancies={org.vacancies}
        asOf={asOf}
        today={today}
        projectedCount={org.projectedCount}
        historyStartsAt={org.historyStartsAt}
        focusId={focusId}
      />
    </Suspense>
  );
}