alpenwerk-hr/app/api/export/employees/route.ts

import { NextResponse, type NextRequest } from "next/server";
import { statusLabel } from "@/lib/absence";
import { exportFilename, exportResponseHeaders, toCsv, toXlsx, type ExportColumn } from "@/lib/export";
import { todayIso } from "@/lib/format";
import { subtreeOf } from "@/lib/org";
import { loadPlacements, loadReportingLineMap } from "@/lib/placement";
import { deriveStatusAsOf, parseIsoDateParam, parseStatuses, type OrgLookups } from "@/lib/reports";
import { loadDependentsCounts, loadOrgLookups, type ReportFilters } from "@/lib/reports-data";
import { requireHrUser } from "@/lib/auth/require-hr";
import { withUser } from "@/lib/db";
import type { Database, EmploymentType, Weekday } from "@/lib/supabase/types";

// Die Rohzeile plus die Einordnung, die nicht mehr auf ihr steht: sie kommt
// über die Planstelle und die abgeleitete Berichtslinie.
type EmployeeRow = Database["public"]["Tables"]["employees"]["Row"] & {
  org_unit_id: string | null;
  position_number: string | null;
  is_chief: boolean;
  manager_id: string | null;
};

// Full raw data dump — every column on `employees`, not just the fields a
// pivot report groups by. Respects the same division/location/status/
// employment filters as the Berichte page. With `asOf` (Stichtag), status
// filtering happens against the *derived* status as of that date rather
// than the live `status` column — see deriveStatusAsOf.
export async function GET(request: NextRequest) {
  const gate = await requireHrUser();
  if ("denied" in gate) return gate.denied;

  const params = request.nextUrl.searchParams;
  const format = params.get("format") === "xlsx" ? "xlsx" : "csv";
  const asOf = parseIsoDateParam(params.get("asOf"));
  const filters: ReportFilters = {
    division: params.get("division") ?? undefined,
    location: params.get("location") ?? undefined,
    status: params.get("status") ?? undefined,
    employment: params.get("employment") ?? undefined,
  };

  const statuses = parseStatuses(filters.status);

  const stichtag = asOf ?? todayIso();

  const { employees, lookups, orgMaps, allEmployees, dependentsCounts, placements, lines } = await withUser(
    gate.userId,
    async (tx) => {
      function employeeQuery() {
        let q = tx.selectFrom("employees").selectAll().orderBy("last_name").orderBy("id");
        if (filters.location) q = q.where("location_id", "=", filters.location);
        if (filters.employment) q = q.where("employment_type", "=", filters.employment as EmploymentType);
        if (!asOf) q = q.where("status", "in", statuses);
        return q;
      }

      const [employees, lookupResult, allEmployees, dependentsCounts, placements, lines] = await Promise.all([
        employeeQuery().execute(),
        loadOrgLookups(tx),
        tx.selectFrom("employees").select(["id", "first_name", "last_name"]).orderBy("id").execute(),
        loadDependentsCounts(tx),
        loadPlacements(tx, { asOf: stichtag }),
        loadReportingLineMap(tx, stichtag),
      ]);

      return {
        employees,
        lookups: lookupResult.lookups,
        orgMaps: lookupResult.orgMaps,
        allEmployees,
        dependentsCounts,
        placements,
        lines,
      };
    }
  );

  const managerName = new Map(allEmployees.map((e) => [e.id, `${e.first_name} ${e.last_name}`]));
  // Der Einheitenfilter meint den ganzen Teilbaum — sonst enthielte ein
  // Export für "Produktion" nur die Bereichsleitung.
  const allowedUnits = filters.division ? new Set(subtreeOf(orgMaps, filters.division)) : null;

  const enriched: EmployeeRow[] = employees.flatMap((e) => {
    const placement = placements.get(e.id);
    const orgUnitId = placement?.current ? placement.orgUnitId : null;
    if (allowedUnits && (!orgUnitId || !allowedUnits.has(orgUnitId))) return [];
    return [{
      ...e,
      org_unit_id: orgUnitId,
      position_number: placement?.positionNumber ?? null,
      is_chief: placement?.isChief ?? false,
      manager_id: lines.get(e.id)?.acting_manager_id ?? null,
    }];
  });
  const rows = asOf ? enriched.filter((e) => statuses.includes(deriveStatusAsOf(e, asOf))) : enriched;
  const columns = employeeExportColumns(lookups, managerName, dependentsCounts, asOf);
  const filename = exportFilename("mitarbeiter-export", format);

  const body = format === "xlsx" ? await toXlsx(rows, columns, "Mitarbeiter") : toCsv(rows, columns);
  // TS 5.9's Uint8Array<ArrayBufferLike> vs DOM's BlobPart/ArrayBuffer<> generic
  // mismatch (microsoft/TypeScript#59417) — a real Uint8Array works fine here.
  return new NextResponse(new Blob([body as BlobPart]), { headers: exportResponseHeaders(filename, format) });
}

const WEEKDAY_ORDER: Weekday[] = ["Mo", "Di", "Mi", "Do", "Fr", "Sa", "So"];

function employeeExportColumns(
  lookups: OrgLookups,
  managerName: Map<string, string>,
  dependentsCounts: Map<string, number>,
  asOf?: string
): ExportColumn<EmployeeRow>[] {
  const columns: ExportColumn<EmployeeRow>[] = [
    { header: "Pers.-Nr.", get: (e) => e.personnel_number },
    { header: "Vorname", get: (e) => e.first_name },
    { header: "Nachname", get: (e) => e.last_name },
    { header: "Geschlecht", get: (e) => (e.gender === "m" ? "männlich" : "weiblich") },
    { header: "Geburtsdatum", get: (e) => e.birth_date, kind: "date" },
    { header: "SV-Nummer", get: (e) => e.sv_nummer },
    { header: "Staatsbürgerschaft", get: (e) => e.nationality },
    { header: "Adresse", get: (e) => e.address },
    { header: "Postleitzahl", get: (e) => e.postal_code },
    { header: "Ort", get: (e) => e.city },
    { header: "Wohnsitzland", get: (e) => e.address_country },
    { header: "E-Mail", get: (e) => e.email },
    { header: "Telefon", get: (e) => e.phone },
    { header: "Bereich", get: (e) => (e.org_unit_id ? (lookups.divisionName.get(e.org_unit_id) ?? "") : "") },
    { header: "Abteilung", get: (e) => (e.org_unit_id ? (lookups.departmentName.get(e.org_unit_id) ?? "") : "") },
    { header: "Team", get: (e) => (e.org_unit_id ? (lookups.teamName.get(e.org_unit_id) ?? "") : "") },
    { header: "Standort", get: (e) => lookups.locationName.get(e.location_id) ?? "" },
    { header: "Position", get: (e) => e.job_title },
    { header: "Vorgesetzte:r", get: (e) => (e.manager_id ? (managerName.get(e.manager_id) ?? "") : "") },
    { header: "Planstelle", get: (e) => e.position_number },
    { header: "Leitungsplanstelle", get: (e) => e.is_chief },
    { header: "Beschäftigungsausmaß", get: (e) => e.employment_type },
    { header: "Wochenstunden", get: (e) => e.weekly_hours },
    // work_days is stored in click order (see RoleEmploymentFields), not
    // guaranteed chronological — re-sort Mo→So for the export.
    { header: "Arbeitstage", get: (e) => [...e.work_days].sort((a, b) => WEEKDAY_ORDER.indexOf(a as Weekday) - WEEKDAY_ORDER.indexOf(b as Weekday)).join(", ") },
    { header: "Vertragsart", get: (e) => e.contract_type },
    { header: "Befristet bis", get: (e) => e.contract_end_date, kind: "date" },
    { header: "Angestellte:r / Arbeiter:in", get: (e) => e.worker_type },
    { header: "Kollektivvertrag", get: (e) => e.collective_agreement },
    { header: "Betriebsrat", get: (e) => e.is_betriebsrat },
    { header: "Dienstwagen", get: (e) => e.has_dienstwagen },
    { header: "Laterale Führung", get: (e) => e.is_laterale_fuehrung },
    { header: "C-Level", get: (e) => e.is_c_level },
    { header: "Paygrade", get: (e) => e.paygrade },
    { header: "Herkunft", get: (e) => e.source },
    // The export shows the display name, not the raw enum value — a payroll
    // hand-off saying "Karenz" for what the app calls Langzeitabwesenheit
    // would just cause questions.
    { header: "Status", get: (e) => statusLabel(e.status) },
    { header: "Art der Langzeitabwesenheit", get: (e) => e.absence_type },
    { header: "Eintrittsdatum", get: (e) => e.entry_date, kind: "date" },
    { header: "Austrittsdatum", get: (e) => e.exit_date, kind: "date" },
    { header: "Austrittsgrund", get: (e) => e.exit_reason },
    { header: "Abwesenheit ab", get: (e) => e.karenz_start_date, kind: "date" },
    { header: "Rückkehr geplant", get: (e) => e.karenz_return_date, kind: "date" },
    { header: "Anzahl Angehörige", get: (e) => dependentsCounts.get(e.id) ?? 0 },
  ];
  if (asOf) {
    const statusIndex = columns.findIndex((c) => c.header === "Status");
    columns.splice(statusIndex + 1, 0, { header: `Status zum Stichtag (${asOf})`, get: (e) => deriveStatusAsOf(e, asOf) });
  }
  return columns;
}