import 'package:flutter/material.dart';
import 'package:iroute/components/components.dart';
import '../router/app_router_delegate.dart';
import '../router/iroute_config.dart';
import '../router/routes.dart';

class AppNavigationRail extends StatefulWidget {
  const AppNavigationRail({super.key});

  @override
  State<AppNavigationRail> createState() => _AppNavigationRailState();
}

class _AppNavigationRailState extends State<AppNavigationRail> {

  @override
  void initState() {
    super.initState();
    router.addListener(_onRouterChange);
  }

  @override
  void dispose() {
    router.removeListener(_onRouterChange);
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return DragToMoveWrap(
      child: TolyNavigationRail(
        items: deskNavBarMenus,
        leading: const Padding(
          padding: EdgeInsets.symmetric(vertical: 18.0),
          child: FlutterLogo(),
        ),
        tail: Padding(
          padding: const EdgeInsets.only(bottom: 6.0),
          child: Text(
            'V0.0.9',
            style: TextStyle(color: Colors.white, fontSize: 12),
          ),
        ),
        backgroundColor: const Color(0xff3975c6),
        onDestinationSelected: _onDestinationSelected,
        selectedIndex: activeIndex,
      ),
    );
  }

  RegExp _segReg = RegExp(r'/app/\w+');

  int? get activeIndex {
    String path = router.path;
    RegExpMatch? match = _segReg.firstMatch(path);
    if (match == null) return null;
    String? target = match.group(0);
    int index = deskNavBarMenus.indexWhere((menu) => menu.path!.contains(target??''));
    if (index == -1) return null;
    return index;
  }

  void _onDestinationSelected(int index) {
    String path = deskNavBarMenus[index].path!;
    if (index == 1) {
      router.changePath(path, keepAlive: true);
      return;
    }
    if (index == 4) {
      router.changePath(path, style: RouteStyle.push);
      return;
    } else {
      router.changePath(path);
    }
  }

  void _onRouterChange() {
    setState(() {});
  }
}