import SwiftUI
import UIKit

// 1. 状态管理类 - 控制底部导航栏显示状态
class TabBarState: ObservableObject {
    @Published var isTabBarHidden = false // 控制底部导航栏是否隐藏
}

// 扩展状态管理类，提供便捷方法
extension TabBarState {
    func hideTabBar() { isTabBarHidden = true }
    func showTabBar() { isTabBarHidden = false }
    func toggleTabBar() { isTabBarHidden.toggle() }
}

// 2. 自定义TabBar控制器（支持全屏显示）
class CustomTabBarController: UITabBarController {
    var shouldHideTabBar: Bool = false {
        didSet {
            updateTabBarVisibility()
        }
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // 配置控制器支持全屏
        edgesForExtendedLayout = .all // 允许内容延伸到导航栏/状态栏下方
        extendedLayoutIncludesOpaqueBars = true // 包含不透明的导航栏
        automaticallyAdjustsScrollViewInsets = false // 禁止自动调整滚动视图Insets
    }
    
    private func updateTabBarVisibility() {
        UIView.animate(withDuration: 0.3) {
            self.tabBar.isHidden = self.shouldHideTabBar
            // 调整安全区域：全屏时移除底部额外内边距
            self.viewControllers?.forEach { vc in
                vc.additionalSafeAreaInsets.bottom = self.shouldHideTabBar ? 0 : 0
                // 强制子视图刷新布局
                vc.view.setNeedsLayout()
            }
        }
    }
}

// 3. SwiftUI与UIKit的桥接视图（支持全屏）
struct TabBarContainerView: UIViewControllerRepresentable {
    @Binding var isTabBarHidden: Bool
    
    init(isTabBarHidden: Binding<Bool>) {
        self._isTabBarHidden = isTabBarHidden
    }
    
    func makeCoordinator() -> Coordinator {
        Coordinator(self)
    }
    
    func makeUIViewController(context: Context) -> CustomTabBarController {
        let tabBarController = CustomTabBarController()
        
        // 配置搜索标签页（添加全屏修饰符）
        let searchView = SearchView()
            .edgesIgnoringSafeArea(.all) // 忽略安全区域
        
        let searchVC = UIHostingController(rootView: searchView)
        searchVC.tabBarItem = UITabBarItem(
            title: "搜索",
            image: UIImage(systemName: "magnifyingglass"),
            tag: 0
        )
        searchVC.edgesForExtendedLayout = .all
        
        // 配置排行榜标签页（添加全屏修饰符）
        let rankingsView = RankingsView()
            .edgesIgnoringSafeArea(.all)
        
        let rankingsVC = UIHostingController(rootView: rankingsView)
        rankingsVC.tabBarItem = UITabBarItem(
            title: "排行榜",
            image: UIImage(systemName: "chart.bar"),
            tag: 1
        )
        rankingsVC.edgesForExtendedLayout = .all
        
        // 配置我的标签页（添加全屏修饰符）
        let profileView = ProfileView()
            .edgesIgnoringSafeArea(.all)
        
        let profileVC = UIHostingController(rootView: profileView)
        profileVC.tabBarItem = UITabBarItem(
            title: "我的",
            image: UIImage(systemName: "person"),
            tag: 2
        )
        profileVC.edgesForExtendedLayout = .all
        
        tabBarController.viewControllers = [searchVC, rankingsVC, profileVC]
        return tabBarController
    }
    
    func updateUIViewController(_ uiViewController: CustomTabBarController, context: Context) {
        uiViewController.shouldHideTabBar = isTabBarHidden
    }
    
    class Coordinator: NSObject {
        var parent: TabBarContainerView
        
        init(_ parent: TabBarContainerView) {
            self.parent = parent
        }
    }
}

// 4. 主视图（支持全屏）
struct MainView: View {
    @EnvironmentObject var tabState: TabBarState
    
    var body: some View {
        TabBarContainerView(isTabBarHidden: $tabState.isTabBarHidden)
            .navigationTitle("漫画列表")
            .navigationBarTitleDisplayMode(.inline)
            .toolbarBackground(.hidden, for: .navigationBar)
            .edgesIgnoringSafeArea(.all) // 主视图忽略安全区域
    }
}