// home_shell.dart — 主框架分发器（按 formFactor 选三端外壳）
//
// desktop → 侧栏 6 项 + 顶栏（对照 ui_kits/desktop）
// tablet  → 暂用 MobileShell（TODO: TabletShell 侧栏双栏，对照 ui_kits/tablet）
// mobile  → 底 Tab + 滑动（对照 ui_kits/mobile）
import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';

import '../core/responsive/form_factor.dart';
import '../pangolin_theme.dart';
import '../state/app_providers.dart';
import '../state/update_provider.dart';
import '../widgets/update_dialog.dart';
import 'desktop_shell.dart';
import 'mobile_shell.dart';
import 'tablet_shell.dart';

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

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final c = context.pangolin;

    // 启动自动检查更新:watch 惰性拉起 updateProvider(延迟 3s→查→1h 轮询)。
    // 非强制更新 → 顶部 banner(见下,不打断);强制更新 → 不可关闭弹窗。
    ref.listen<AsyncValue<AppUpdateInfo?>>(updateProvider, (prev, next) {
      final info = next.valueOrNull;
      if (info != null && info.hasUpdate && info.forceUpdate) {
        WidgetsBinding.instance.addPostFrameCallback((_) {
          if (context.mounted) {
            showUpdateDialog(context, ref.read(appTextProvider), info);
          }
        });
      }
    });

    final info = ref.watch(updateProvider).valueOrNull;
    final dismissedVer = ref.watch(dismissedUpdateVersionProvider);
    final showBanner = info != null &&
        info.hasUpdate &&
        !info.forceUpdate &&
        dismissedVer != info.latestVersion;

    final Widget body = switch (context.formFactor) {
      FormFactor.desktop => const DesktopShell(),
      FormFactor.tablet => const TabletShell(),
      FormFactor.mobile => const MobileShell(),
    };
    return Scaffold(
      backgroundColor: c.bg,
      body: showBanner
          ? Column(children: [UpdateBanner(info: info), Expanded(child: body)])
          : body,
    );
  }
}