Veloria/Veloria/Base/Controller/VPTabBarController.swift

//
//  VPTabBarController.swift
//  Veloria
//
//  Created by Veloria on 2025/5/19.
//

import UIKit

class VPTabBarController: UITabBarController {
    
    private var ignoreNextSelection = false
    
    override var selectedViewController: UIViewController? {
        willSet {
            guard let newValue = newValue else {
                // if newValue == nil ...
                return
            }
            
            guard !ignoreNextSelection else {
                ignoreNextSelection = false
                return
            }
            
            guard let tabBar = self.tabBar as? VPTabBar, let index = viewControllers?.firstIndex(of: newValue) else {
                return
            }
            tabBar.select(itemAtIndex: index, animated: false)
        }
    }
    
    override var selectedIndex: Int {
        willSet {
            guard let tabBar = self.tabBar as? VPTabBar else {
                return
            }
            guard !ignoreNextSelection else {
                ignoreNextSelection = false
                return
            }
            
            tabBar.select(itemAtIndex: newValue, animated: false)
        }
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        let tabBar = VPTabBar()
        tabBar.delegate = self
        self.setValue(tabBar, forKey: "tabBar")
        
        view.backgroundColor = .color000000()
        
        vp_setup()
        self.tabBar.isTranslucent = true
        
    }
    

    //MARK:--------------   状态栏样式  --------------
    override var childForStatusBarStyle: UIViewController? {
        return self.selectedViewController
    }
    
    override var childForStatusBarHidden: UIViewController? {
        return self.selectedViewController
    }

}

extension VPTabBarController {
    
    private func vp_setup() {
        let appearance = UITabBarAppearance()
        
        appearance.backgroundImage = UIImage(color: .clear)
        appearance.backgroundColor = .colorFFFFFF(alpha: 0.1)
        appearance.shadowImage = UIImage()
        appearance.shadowColor = .clear
        appearance.backgroundEffect = UIBlurEffect(style: .dark)
        tabBar.standardAppearance = appearance
        tabBar.scrollEdgeAppearance = appearance
        
        
        
        let nav1 = createNavigationController(viewController: VPHomePageViewController(), title: "Home".localized, image: UIImage(named: "tabbar_icon_01"), selectedImage: UIImage(named: "tabbar_icon_01_selected"))
        let nav2 = createNavigationController(viewController: VPExploreViewController(), title: "Explore".localized, image: UIImage(named: "tabbar_icon_02"), selectedImage: UIImage(named: "tabbar_icon_02_selected"))
        let nav3 = createNavigationController(viewController: VPMyListViewController(), title: "My List".localized, image: UIImage(named: "tabbar_icon_03"), selectedImage: UIImage(named: "tabbar_icon_03_selected"))
        let nav4 = createNavigationController(viewController: VPMeViewController(), title: "Me".localized, image: UIImage(named: "tabbar_icon_04"), selectedImage: UIImage(named: "tabbar_icon_04_selected"))
        
        viewControllers = [nav1, nav2, nav3, nav4]
        
    }
    
    private func createNavigationController(viewController: UIViewController, title: String?, image: UIImage?, selectedImage: UIImage?) -> UINavigationController {
        
        
        let tabBarItem = VPTabBarItem()
        tabBarItem.title = title
        tabBarItem.image = image
        tabBarItem.selectedImage = selectedImage
        
        let nav = VPNavigationController(rootViewController: viewController)
        nav.tabBarItem = tabBarItem
        return nav
    }
    
}

extension VPTabBarController {
    
    override func tabBar(_ tabBar: UITabBar, didSelect item: UITabBarItem) {
        guard let idx = tabBar.items?.firstIndex(of: item) else {
            return;
        }
        if let vc = viewControllers?[idx] {
            ignoreNextSelection = true
            selectedIndex = idx
            delegate?.tabBarController?(self, didSelect: vc)
        }
    }
    
    override func tabBar(_ tabBar: UITabBar, willBeginCustomizing items: [UITabBarItem]) {
        if let tabBar = tabBar as? VPTabBar {
            tabBar.updateLayout()
        }
    }
    
    override func tabBar(_ tabBar: UITabBar, didEndCustomizing items: [UITabBarItem], changed: Bool) {
        if let tabBar = tabBar as? VPTabBar {
            tabBar.updateLayout()
        }
    }
    
}


extension VPTabBarController {
    func openHistoryPage() {
        
        var index: Int?
        var viewController: VPMyListViewController?
        self.viewControllers?.enumerated().forEach({
            guard let nav = $1 as? UINavigationController else { return }
            if let vc = nav.viewControllers.first as? VPMyListViewController {
                index = $0
                viewController = vc
            }
            
        })
        if let index = index {
            self.selectedIndex = index
            viewController?.showHistoryPage()
        }
    }
    
    func openCollectPage() {
        
        var index: Int?
        var viewController: VPMyListViewController?
        self.viewControllers?.enumerated().forEach({
            guard let nav = $1 as? UINavigationController else { return }
            if let vc = nav.viewControllers.first as? VPMyListViewController {
                index = $0
                viewController = vc
            }
            
        })
        if let index = index {
            self.selectedIndex = index
            viewController?.showCollectPage()
        }
    }
}