"use client";

import React, { useState, useTransition, useCallback, useMemo } from "react";
import { useRouter } from "next/navigation";
import { ColumnDef } from "@tanstack/react-table";
import { EuResponsiblePersonsOverview, getColumns } from "./columns";
import { EntityDetailPanel } from "@/components/dashboard/data-view/EntityDetailSheet";
import { DashboardPage } from "@/components/dashboard/DashboardPage";
import { EntityOverviewHeader } from "@/components/dashboard/EntityOverviewHeader";
import { MasterDetailLayout } from "@/components/dashboard/data-view/MasterDetailLayout";

import { PaginatedDataTable } from "@/components/dashboard/data-view/PaginatedDataTable";

interface EuResponsiblePersonsOverviewClientProps {
  initialData: { documents: EuResponsiblePersonsOverview[]; total: number };
  page: number;
  pageSize: number;
}

/**
 * ⚡ Optimization: EuResponsiblePersonsOverviewClient with Server-Side Props
 */
const EuResponsiblePersonsOverviewClient = React.memo(({
  initialData,
  page,
  pageSize,
}: EuResponsiblePersonsOverviewClientProps) => {
  const router = useRouter();
  const [isPending, startTransition] = useTransition();
  const [selectedEntity, setSelectedEntity] = useState<EuResponsiblePersonsOverview | null>(null);

  const handleRowClick = useCallback((person: EuResponsiblePersonsOverview) => {
    setSelectedEntity(person);
  }, []);

  const handleAddNew = useCallback(() => {
    setSelectedEntity({} as any);
  }, []);

  const handleDataChange = useCallback(() => {
    startTransition(() => {
      router.refresh();
    });
  }, [router]);

  const handleCancel = useCallback(() => {
    setSelectedEntity(null);
  }, []);

  const columns = useMemo<ColumnDef<EuResponsiblePersonsOverview>[]>(() => 
    getColumns(handleRowClick, router, startTransition, isPending),
  [handleRowClick, isPending, router]);

  return (
    <DashboardPage>
      <EntityOverviewHeader
        title="Verantwortliche Personen (EU)"
        onAddClick={handleAddNew}
        addLabel="Hinzufügen"
      />

      <MasterDetailLayout>
        <MasterDetailLayout.Master isPending={isPending}>
          <PaginatedDataTable
            columns={columns}
            data={initialData.documents}
            page={page}
            pageSize={pageSize}
            totalCount={initialData.total}
            onRowClick={handleRowClick}
          />
        </MasterDetailLayout.Master>

        <MasterDetailLayout.Detail>
          <EntityDetailPanel
            data={selectedEntity as any}
            type="eu-responsible-person"
            mode="panel"
            onDataChange={handleDataChange}
            onCancel={handleCancel}
          />
        </MasterDetailLayout.Detail>
      </MasterDetailLayout>
    </DashboardPage>
  );
});

EuResponsiblePersonsOverviewClient.displayName = "EuResponsiblePersonsOverviewClient";

export default EuResponsiblePersonsOverviewClient;