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(
      title: Text(
        title,
        style: const TextStyle(
          fontWeight: FontWeight.bold,
          fontSize: 18,
          color: Colors.black87,
        ),
      ),
      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,
      bottom: TabBar(
        controller: tabController,
        isScrollable: tabBarScrollable,
        padding: tabPadding,
        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],
        indicator: UnderlineTabIndicator(
          borderSide: BorderSide(color: AppConstants.primaryColor, width: 3),
        ),
        labelStyle: const TextStyle(fontWeight: FontWeight.bold),
      ),
    );
  }
}