import 'package:flutter/material.dart';
import '../constants/app_constants.dart';

/// 时间: 2026-03-22
/// 功能: 主导航内「标题 + Tab」共用 AppBar 构造
/// 介绍: 压缩工具栏与 Tab 行高度，关闭 M3 卷动 surface tint，统一收藏页与发现页顶部观感
/// 最新变化: 初始提取，减少两页相同结构的顶部留白

/// 主导航子页（IndexedStack 内）带 [TabBar] 的页面共用 [AppBar] 配置
class TabbedNavAppBar {
  TabbedNavAppBar._();

  static AppBar build({
    required String title,
    required TabController tabController,
    required List<String> tabLabels,
    List<Widget>? actions,
    Widget? leading,
    bool tabBarScrollable = false,
    EdgeInsetsGeometry? tabPadding,
    EdgeInsetsGeometry? tabLabelPadding,
  }) {
    return AppBar(
      toolbarHeight: AppConstants.tabbedPageToolbarHeight,
      title: Text(title, style: const TextStyle(fontWeight: FontWeight.bold)),
      backgroundColor: Colors.white,
      foregroundColor: Colors.black87,
      iconTheme: const IconThemeData(color: Colors.black87),
      elevation: 0,
      scrolledUnderElevation: 0,
      surfaceTintColor: Colors.transparent,
      shadowColor: Colors.transparent,
      centerTitle: true,
      leading: leading,
      actions: actions,
      // 用 PreferredSize + 固定高度略小于默认 Tab 行，减少两页相同的「标题+Tab」总高度（当前 SDK 无 tabHeight 参数）
      bottom: PreferredSize(
        preferredSize: Size.fromHeight(AppConstants.tabbedPageTabBarHeight),
        child: SizedBox(
          height: AppConstants.tabbedPageTabBarHeight,
          child: TabBar(
            controller: tabController,
            isScrollable: tabBarScrollable,
            padding:
                tabPadding ??
                (tabBarScrollable
                    ? const EdgeInsets.only(
                        left: AppConstants.pageHorizontalPadding,
                        right: 8,
                      )
                    : null),
            labelPadding: tabLabelPadding,
            tabAlignment: tabBarScrollable ? TabAlignment.start : null,
            dividerHeight: 0,
            dividerColor: Colors.transparent,
            tabs: tabLabels.map((String e) => Tab(text: e)).toList(),
            labelColor: AppConstants.primaryColor,
            unselectedLabelColor: Colors.grey[600],
            indicatorColor: AppConstants.primaryColor,
            indicatorWeight: 3,
            labelStyle: const TextStyle(fontWeight: FontWeight.bold),
          ),
        ),
      ),
    );
  }
}