//
//  MainTabBarController.swift
//  QuickLocation
//

import UIKit

final class MainTabBarController: UITabBarController {

    // MARK: - View Controllers
    private lazy var locationNav = BaseNavigationController(rootViewController: HomeViewController())
    private lazy var exploreNav = BaseNavigationController(rootViewController: ViewController())
    private lazy var circlesNav = BaseNavigationController(rootViewController: ViewController())
    private lazy var mineNav = BaseNavigationController(rootViewController: MineViewController())

    private lazy var navControllers: [BaseNavigationController] = {
        [locationNav, exploreNav, circlesNav, mineNav]
    }()

    // MARK: - Custom Tab Bar
    private let customTabBar: QuickLocationTabBar = {
        let items: [QuickLocationTabBar.TabItem] = [
            QuickLocationTabBar.TabItem(
                title: "位置",
                image: UIImage(named: "Tabbar/location"),
                selectedImage: UIImage(named: "Tabbar/location_selected")
            ),
            QuickLocationTabBar.TabItem(
                title: "探索",
                image: UIImage(named: "Tabbar/explore"),
                selectedImage: UIImage(named: "Tabbar/explore_selected")
            ),
            QuickLocationTabBar.TabItem(
                title: "圈子",
                image: UIImage(named: "Tabbar/group"),
                selectedImage: UIImage(named: "Tabbar/group_selected")
            ),
            QuickLocationTabBar.TabItem(
                title: "我的",
                image: UIImage(named: "Tabbar/mine"),
                selectedImage: UIImage(named: "Tabbar/mine_selected")
            )
        ]
        return QuickLocationTabBar(items: items)
    }()

    // MARK: - Lifecycle
    override func viewDidLoad() {
        super.viewDidLoad()

        viewControllers = navControllers
        tabBar.isHidden = true

        for nav in navControllers {
            nav.delegate = self
        }

        view.addSubview(customTabBar)
        customTabBar.delegate = self

        customTabBar.translatesAutoresizingMaskIntoConstraints = false
        let tabBarHeight = customTabBar.intrinsicContentSize.height
        NSLayoutConstraint.activate([
            customTabBar.leadingAnchor.constraint(equalTo: view.leadingAnchor),
            customTabBar.trailingAnchor.constraint(equalTo: view.trailingAnchor),
            customTabBar.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: -41),
            customTabBar.heightAnchor.constraint(equalToConstant: tabBarHeight)
        ])
    }

    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
        view.bringSubviewToFront(customTabBar)
    }
}

// MARK: - QuickLocationTabBarDelegate
extension MainTabBarController: QuickLocationTabBarDelegate {
    func tabBar(_ tabBar: QuickLocationTabBar, didSelectTabAt index: Int) {
        selectedIndex = index
    }
}

// MARK: - UINavigationControllerDelegate
extension MainTabBarController: UINavigationControllerDelegate {
    func navigationController(_ navigationController: UINavigationController, willShow viewController: UIViewController, animated: Bool) {
        customTabBar.isHidden = navigationController.viewControllers.count > 1
    }
}