import React, { useCallback, useEffect, useMemo } from 'react';
import type { ReactNode } from 'react';
import { useNavigate } from 'react-router-dom';
import {
  DocumentsFilterProvider,
} from '../documents/context/DocumentsFilterContext';
import { PreviewProvider } from '../preview/PreviewContext';
import { useWorkspaceSurface } from './useWorkspaceSurface';
import { DocumentsHeaderBreadcrumb } from '../documents/panel/DocumentsPanelHeader';
import { SidebarProvider, useSidebarContext } from '../sidebar/SidebarContext';
import { PanelManagerProvider, usePanelManager } from './PanelManagerContext';
import Sidebar from '../sidebar/Sidebar';
import useDocumentsShell from './useDocumentsShell';

const DocumentsRouteContent: React.FC = () => {
  const {
    sidebarProps,
    surfaceConfig,
    documentsFilter,
  } = useDocumentsShell();
  const navigate = useNavigate();
  const { collapsed: sidebarCollapsed } = useSidebarContext();
  const {
    sidebarSuppressed,
    expandSidebar,
  } = usePanelManager();

  const sidebarHidden = sidebarCollapsed || sidebarSuppressed;

  const handleHeaderBreadcrumbClick = useCallback((crumb: DocumentsHeaderBreadcrumb) => {
    if (!crumb || !crumb.id) {
      return;
    }
    const target = crumb.id === 'root' ? '/documents' : `/documents/folder/${crumb.id}`;
    navigate(target);
  }, [navigate]);

  const handleDocumentNavigate = useCallback((documentId: string) => {
    navigate(`/documents/${documentId}`);
  }, [navigate]);

  const documentsTablePropsWithNav = useMemo(() => (
    surfaceConfig.documentsTableProps
      ? { ...surfaceConfig.documentsTableProps, onBreadcrumbNavigate: handleHeaderBreadcrumbClick }
      : null
  ), [surfaceConfig.documentsTableProps, handleHeaderBreadcrumbClick]);

  const { surface } = useWorkspaceSurface({
    sidebarHidden,
    onExpandSidebar: expandSidebar,
    ...surfaceConfig,
    documentsTableProps: documentsTablePropsWithNav,
  });

  useEffect(() => {
    document.body.classList.add('has-main-content');
    return () => {
      document.body.classList.remove('has-main-content');
    };
  }, []);

  const renderSurface = () => {
    const detailMode = surface?.detailMode ?? null;
    const layoutClass = `documents-main${sidebarHidden ? ' documents-main--sidebar-hidden' : ''}${detailMode === 'overlay' ? ' documents-main--overlay-detail' : ''}`;
    const sidebarNode = !sidebarHidden && sidebarProps ? <Sidebar {...sidebarProps} /> : null;
    const surfaceDetail = surface && (surface as { detail?: ReactNode }).detail ? (surface as { detail?: ReactNode }).detail : null;
    const surfaceBody = surface ? surface.content : null;

    return (
      <main className={layoutClass}>
        {sidebarNode}
        <div className="main-content">
          {surfaceBody}
        </div>
        {surfaceDetail}
      </main>
    );
  };

  const content = renderSurface();
  return (
    <DocumentsFilterProvider value={documentsFilter}>
      <PreviewProvider
        ensureDownloadUrl={surfaceConfig.documentsTableProps?.ensureDownloadUrl}
        onNavigate={handleDocumentNavigate}
      >
        {content}
      </PreviewProvider>
    </DocumentsFilterProvider>
  );
};

const DocumentsRoute: React.FC = () => (
  <SidebarProvider>
    <PanelManagerProvider>
      <DocumentsRouteContent />
    </PanelManagerProvider>
  </SidebarProvider>
);

export default DocumentsRoute;
