//
//  ShortcutManager.m
//  VclustersGemini
//
//  Created by 余衡武 on 2021/10/18.
//  Copyright © 2021 APPLE. All rights reserved.
//

#import "ShortcutManager.h"
#import "AppDelegate.h"

static ShortcutManager *shareInstance = nil;

@interface ShortcutManager ()


@end

@implementation ShortcutManager

+ (instancetype)shareInstance {
    
    static dispatch_once_t onceToken;
    
    dispatch_once(&onceToken, ^{
        shareInstance = [[ShortcutManager alloc] init];
        
    });
    
    return shareInstance;
}

#pragma mark 获取手机当前显示的ViewController
//获取手机当前显示的ViewController 方法1-遍历法
- (UIViewController *)getCurrentViewController {

    UIViewController *vc = [UIApplication sharedApplication].keyWindow.rootViewController;
    
    while (1)
    {
        if (vc.presentedViewController) {
            vc = vc.presentedViewController;
        } else if ([vc isKindOfClass:[UITabBarController class]]) {
            vc = ((UITabBarController*)vc).selectedViewController;
        } else if ([vc isKindOfClass:[UINavigationController class]]) {
            vc = ((UINavigationController*)vc).visibleViewController;
        } else {
            break;
        }
    }
    return vc;
}

//获取手机当前显示的ViewController 方法1-递归法
- (UIViewController *)findCurrentShowingViewController {
    //获得当前活动窗口的根视图
    UIViewController *vc = [UIApplication sharedApplication].keyWindow.rootViewController;
    UIViewController *currentShowingVC = [self findCurrentShowingViewControllerFrom:vc];
    return currentShowingVC;
}

- (UIViewController *)findCurrentShowingViewControllerFrom:(UIViewController *)vc
{
    //方法1：递归方法 Recursive method
    UIViewController *currentShowingVC;
    if ([vc presentedViewController]) { //注要优先判断vc是否有弹出其他视图，如有则当前显示的视图肯定是在那上面
        // 当前视图是被presented出来的
        UIViewController *nextRootVC = [vc presentedViewController];
        currentShowingVC = [self findCurrentShowingViewControllerFrom:nextRootVC];
        
    } else if ([vc isKindOfClass:[UITabBarController class]]) {
        // 根视图为UITabBarController
        UIViewController *nextRootVC = [(UITabBarController *)vc selectedViewController];
        currentShowingVC = [self findCurrentShowingViewControllerFrom:nextRootVC];
        
    } else if ([vc isKindOfClass:[UINavigationController class]]){
        // 根视图为UINavigationController
        UIViewController *nextRootVC = [(UINavigationController *)vc visibleViewController];
        currentShowingVC = [self findCurrentShowingViewControllerFrom:nextRootVC];
        
    } else {
        // 根视图为非导航类
        currentShowingVC = vc;
    }
    
    return currentShowingVC;
}

// popToRootViewController
- (void)popToRootViewController:(UIViewController *)vc {
    
    // 1、popToRootViewController
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.3 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        if (vc.navigationController) {
            [vc.navigationController popToRootViewControllerAnimated:NO];
        }
    });

    // 2、tabBarController 选择第一个item (跟2不能同时执行 要做延时)
    vc.tabBarController.selectedIndex = 0;
}

// dismissToRootViewController
- (void)dismissToRootViewController:(UIViewController *)vc {
    // 1、dismissToRootViewController
    while (vc.presentingViewController) {
      vc = vc.presentingViewController;
    }
    
    [vc dismissViewControllerAnimated:NO completion:^{
        
        UIViewController *vc1 = [self findCurrentShowingViewController];
        
        // 2、popToRootViewController
        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.3 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
            if (vc1.navigationController) {
                [vc1.navigationController popToRootViewControllerAnimated:NO];
            }
        });

        // 3、tabBarController 选择第一个item (跟2不能同时执行 要做延时)
        vc1.tabBarController.selectedIndex = 0;
    }];
}

@end