import 'dart:async';

import 'package:flutter/cupertino.dart';
import 'package:get/get.dart';
import 'package:isekai_wiki/components/isekai_page_scaffold.dart';
import 'package:isekai_wiki/pages/discover.dart';
import 'package:isekai_wiki/pages/home.dart';
import 'package:isekai_wiki/pages/search.dart';
import 'package:isekai_wiki/pages/own_profile.dart';

class TabsPageController extends GetxController {
  final tabController = CupertinoTabController();
  final streamController = StreamController.broadcast();
  var tabIndex = 0.obs;

  void emit(String eventName) {
    streamController.add(eventName);
  }

  Future<bool> handleWillPop() async {
    if (Navigator.canPop(Get.context!)) {
      Get.back();
      return false;
    } else if (tabController.index != 0) {
      tabController.index = 0;
      return false;
    }
    return true;
  }

  void handleTapTab(int tabIndex) {
    if (tabIndex != this.tabIndex.value) {
      this.tabIndex.value = tabIndex;
      return;
    }

    switch (tabIndex) {
      case 0:
        emit("tap:home");
        break;
    }
  }

  void toSearchPage() {
    tabController.index = 2;
  }
}

class IsekaiWikiTabsPage extends StatelessWidget {
  const IsekaiWikiTabsPage({super.key});

  @override
  Widget build(BuildContext context) {
    var c = Get.put(TabsPageController());

    return WillPopScope(
      onWillPop: c.handleWillPop,
      child: CupertinoTabScaffold(
        backgroundColor: CupertinoTheme.of(context).scaffoldBackgroundColor,
        controller: c.tabController,
        resizeToAvoidBottomInset: false,
        tabBar: CupertinoTabBar(
          backgroundColor: CupertinoTheme.of(context).barBackgroundColor,
          height: 56,
          onTap: c.handleTapTab,
          items: const <BottomNavigationBarItem>[
            BottomNavigationBarItem(
              icon: Icon(CupertinoIcons.house),
              label: '首页',
            ),
            BottomNavigationBarItem(
              icon: Icon(CupertinoIcons.lightbulb),
              label: '发现',
            ),
            BottomNavigationBarItem(
              icon: Icon(CupertinoIcons.search),
              label: '搜索',
            ),
            BottomNavigationBarItem(
              icon: Icon(CupertinoIcons.person),
              label: '我的',
            ),
          ],
        ),
        tabBuilder: (context, index) {
          switch (index) {
            case 0:
              return CupertinoTabView(
                defaultTitle: "首页",
                builder: (context) => HomeTab(
                  onSearchClick: c.toSearchPage,
                ),
              );
            case 1:
              return CupertinoTabView(
                defaultTitle: "发现",
                builder: (context) => const DiscoverTab(),
              );
            case 2:
              return CupertinoTabView(
                defaultTitle: "搜索",
                builder: (context) => const SearchTab(),
              );
            case 3:
              return CupertinoTabView(
                defaultTitle: "我的",
                builder: (context) => const OwnProfileTab(),
              );
          }

          return CupertinoTabView(
            defaultTitle: "页面不存在",
            builder: (context) => const IsekaiPageScaffold(
              child: SizedBox(),
            ),
          );
        },
      ),
    );
  }
}