// tablet_shell.dart — 平板外壳（侧栏 4 项触控 + 内容区），对照 ui_kits/tablet/tabapp.jsx
//
// 与 desktop 区别：侧栏 232 触控尺寸、4 项（无联系/设置）、顶栏无主题切换；
// 连接页自动走双栏（connect_page 在 formFactor==tablet 时进 isWide 分支）。
import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';

import '../pangolin_theme.dart';
import '../screens/account_page.dart';
import '../screens/connect_page.dart';
import '../screens/contact_page.dart';
import '../screens/nodes_page.dart';
import '../screens/notifications_page.dart';
import '../screens/settings_page.dart';
import '../screens/stats_page.dart';
import '../state/app_providers.dart';
import '../state/navigation_provider.dart';
import '../widgets/content_top_bar.dart';
import '../widgets/nav_sidebar.dart';
import '../widgets/pangolin_icons.dart';
import '../widgets/routing_screen.dart';

class TabletShell extends ConsumerWidget {
  const TabletShell({super.key});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final c = context.pangolin;
    final t = ref.watch(appTextProvider);
    final view = ref.watch(navViewProvider);

    // 「我的」经侧栏底部 PlanBadgeCard 进入(见 NavSidebar;品牌块本身不可点);设置/联系我们对齐桌面侧栏。
    final items = <NavSidebarItem>[
      (icon: PangolinIcons.power, label: t.tabConnect, view: NavView.connect),
      (icon: PangolinIcons.globe, label: t.tabServers, view: NavView.servers),
      (icon: PangolinIcons.chartNoAxesColumn, label: t.tabStats, view: NavView.stats),
      (icon: PangolinIcons.settings, label: t.settingsTitle, view: NavView.settings),
      (icon: PangolinIcons.messageCircle, label: t.contactTitle, view: NavView.contact),
    ];

    final titles = <NavView, String>{
      NavView.connect: t.tabConnect,
      NavView.servers: t.tabServers,
      NavView.stats: t.tabStats,
      NavView.account: t.tabMe,
      NavView.settings: t.settingsTitle,
      NavView.contact: t.contactTitle,
      NavView.invite: t.inviteTitle,
      NavView.notifications: t.notifTitle,
      NavView.routing: t.routingRulesTitle,
    };

    void go(NavView v) => ref.read(navViewProvider.notifier).state = v;

    Widget content() {
      switch (view) {
        case NavView.connect:
          return ConnectPage(isWide: true, onOpenNodes: () => go(NavView.servers));
        case NavView.servers:
          return NodesPage(isWide: true, onPicked: () => go(NavView.connect));
        case NavView.stats:
          return const StatsPage(isWide: true);
        case NavView.settings:
          return const SettingsPage();
        case NavView.contact:
          return const ContactPage();
        case NavView.notifications:
          return NotificationsScreen(t: t, embedded: true);
        case NavView.routing:
          return const RoutingScreen(embedded: true);
        default: // account / plans / redeem / devices → 账户（其余下钻在账户页内）
          return const AccountPage(isWide: true);
      }
    }

    // 通知子页返回目标:回账户;设置下钻子页 → settings(镜像桌面 desktop_shell.dart::backTarget)。
    VoidCallback? backTarget() {
      if (view == NavView.notifications) return () => go(NavView.account);
      if (kSettingsSubViews.contains(view)) return () => go(NavView.settings);
      return null;
    }

    return ColoredBox(
      color: c.bg,
      // iPad 上内容会顶到状态栏(时间/电量/notch)。SafeArea 加顶部安全区,避开重叠;
      // 底部留给页面自行处理(home indicator)。
      child: SafeArea(
        bottom: false,
        child: Row(children: [
          NavSidebar(items: items, width: 232, dense: false),
          Expanded(
            child: Column(children: [
              ContentTopBar(
                title: titles[view] ?? t.tabMe,
                onBack: backTarget(),
                onBell: () => go(NavView.notifications),
                showThemeToggle: false,
                titleSize: 19,
              ),
              Expanded(child: content()),
            ]),
          ),
        ]),
      ),
    );
  }
}