suixinkan_ios_uikit/suixinkan_ios/App/Navigation/AppTab.swift

//
//  AppTab.swift
//  suixinkan
//
//  Created by Codex on 2026/6/18.
//

import UIKit

/// 主 Tab 实体，描述底部导航中的每一个一级入口。
enum AppTab: String, CaseIterable, Identifiable, Hashable {
    case home
    case orders
    case statistics
    case profile

    var id: Self { self }

    var title: String {
        switch self {
        case .home:
            "首页"
        case .orders:
            "订单"
        case .statistics:
            "数据"
        case .profile:
            "我的"
        }
    }

    /// 选中态 TabBar 图标资源名。
    var selectedImageName: String {
        switch self {
        case .home:
            "tab_home_selected"
        case .orders:
            "tab_order_selected"
        case .statistics:
            "tab_data_selected"
        case .profile:
            "tab_profile_selected"
        }
    }

    /// 未选中态 TabBar 图标资源名。
    var unselectedImageName: String {
        switch self {
        case .home:
            "tab_home_unselected"
        case .orders:
            "tab_order_unselected"
        case .statistics:
            "tab_data_unselected"
        case .profile:
            "tab_profile_unselected"
        }
    }

    /// 构建系统 TabBarItem，供 `UITabBarController` 使用。
    func makeTabBarItem() -> UITabBarItem {
        let unselectedImage = UIImage(named: unselectedImageName)?.withRenderingMode(.alwaysOriginal)
        let selectedImage = UIImage(named: selectedImageName)?.withRenderingMode(.alwaysOriginal)
        let item = UITabBarItem(
            title: title,
            image: unselectedImage,
            selectedImage: selectedImage
        )
        item.accessibilityIdentifier = "main.tab.\(rawValue)"
        return item
    }

    /// 构建 Tab 根页面 ViewController。
    func makeRootViewController(services: AppServices) -> UIViewController {
        switch self {
        case .home:
            return HomeViewController()
        case .orders:
            return OrdersViewController()
        case .statistics:
            return StatisticsViewController()
        case .profile:
            return ProfileViewController()
        }
    }
}