package com.sw.dualscreen.utils

import android.app.Activity
import android.os.Process
import java.util.Stack

object ActivityManager {

    private val activityStack = Stack<Activity>()

    // 添加Activity到栈
    fun addActivity(activity: Activity) {
        activityStack.add(activity)
    }

    // 移除指定Activity
    fun removeActivity(activity: Activity) {
        activityStack.remove(activity)
    }

    // 获取当前Activity
    fun currentActivity(): Activity? {
        return if (activityStack.isEmpty()) null else activityStack.lastElement()
    }

    // 结束指定Activity
    fun finishActivity(activity: Activity) {
        if (!activity.isFinishing) {
            activity.finish()
        }
    }

    // 结束所有Activity
    fun finishAllActivity() {
        activityStack.forEach {
            if (!it.isFinishing) {
                it.finish()
            }
        }
        activityStack.clear()
    }

    // 退出应用程序
    fun exitApp() {
        finishAllActivity()
        Process.killProcess(Process.myPid())
    }

    fun getActivityStack(): Stack<Activity>{
        return activityStack
    }

    fun isEmpty() : Boolean {
        return activityStack.isEmpty()
    }

}