import ‘package:flutter/material.dart’;
import ‘package:flutter_mvp_app/db/HiCache.dart’;
import ‘package:flutter_mvp_app/http/dao/login_dao.dart’;
import ‘package:flutter_mvp_app/model/video_model.dart’;
import ‘package:flutter_mvp_app/navigator/hi_navigator.dart’;
import ‘package:flutter_mvp_app/page/home_page.dart’;
import ‘package:flutter_mvp_app/page/login_page.dart’;
import ‘package:flutter_mvp_app/page/registration_page.dart’;
import ‘package:flutter_mvp_app/page/video_detail_page.dart’;
import ‘package:flutter_mvp_app/util/color.dart’;

void main() {
runApp(BiliApp());
}

class BiliApp extends StatefulWidget {
@override
_BiliAppState createState() => _BiliAppState();
}

class _BiliAppState extends State {
BiliRouteDelegate _routeDelegate = BiliRouteDelegate();

@override
Widget build(BuildContext context) {
return FutureBuilder(
// 进行初始化
future: HiCache.preInit(),
builder: (BuildContext context, AsyncSnapshot snapshot) {
// 定义route
var widget = snapshot.connectionState == ConnectionState.done
? Router(
routerDelegate: _routeDelegate,
)
: Scaffold(
body: Center(child: CircularProgressIndicator()),
);

      return MaterialApp(
        home: widget,
        theme: ThemeData(primarySwatch: white),
      );
    });

}
}

class BiliRouteDelegate extends RouterDelegate
with ChangeNotifier, PopNavigatorRouterDelegateMixin {
final GlobalKey navigatorKey;

// 为Navigator设置一个key, 必要的时候可以通过navigatorKey.currentState来获取到NavigatorState对象
BiliRouteDelegate() : navigatorKey = GlobalKey();
RouteStatus _routeStatus = RouteStatus.home;
List pages = [];
VideoModel videoModel;

@override
Widget build(BuildContext context) {
var index = getPageIndex(pages, routeStatus);
List tempPages = pages;
if (index != -1) {
// 要打开的页面在栈中已存在，将该页面和它上面的所有页面进行出栈
// Tips具体规则可以根据需要进行调整，这里要求栈中只允许有一个同样的页面的实例
tempPages = tempPages.sublist(0, index);
}
var page;
if (routeStatus == RouteStatus.home) {
// 跳转首页时将栈中其他页面进行出栈，因为首页不可回退
pages.clear();
page = pageWrap(HomePage(
onJumpToDetail: (videoModel) {
this.videoModel = videoModel;
notifyListeners();
},
));
} else if (routeStatus == RouteStatus.detail) {
page = pageWrap(VideoDetailPage(videoModel));
} else if (routeStatus == RouteStatus.registration) {
page = pageWrap(RegistrationPage(onJumpToLogin: () {
_routeStatus = RouteStatus.login;
notifyListeners();
}));
} else if (routeStatus == RouteStatus.login) {
page = pageWrap(LoginPage());
}
// 重新创建一个数组，否则pages因引用没有改变路由不会生效
tempPages = […tempPages, page];
pages = tempPages;

return Navigator(
  key: navigatorKey,
  pages: pages,
  onPopPage: (route, result) {
    // 在这里可以控制是否可以返回
    if (!route.didPop(result)) {
      return false;
    }
    return true;
  },
);

}

// 获取路由状态
// 若未登录，则转登录页面；若有视频窗口，则转视频详情页；否则返回当前路由
RouteStatus get routeStatus {
if (_routeStatus != RouteStatus.registration && !hasLogin) {
return _routeStatus = RouteStatus.login;
} else if (videoModel != null) {
return _routeStatus = RouteStatus.detail;
} else {
return _routeStatus;
}
}

bool get hasLogin => LoginDao.getBoardingPass() != null;

@override
Future setNewRoutePath(BiliRoutePath configuration) async {
// this.path = path;
}
}

// 定义路由数据，path
class BiliRoutePath {
final String location;

BiliRoutePath.home() : location = “/”;

BiliRoutePath.detail() : location = “/detail”;
}

// 创建页面
pageWrap(Widget child) {
return MaterialPage(key: ValueKey(child.hashCode), child: child);
}