// MyAccessibilityService.kt

package com.example.xUpAndDownScroll

import android.accessibilityservice.AccessibilityService
import android.util.Log
import android.view.KeyEvent
import android.view.accessibility.AccessibilityEvent
import android.view.accessibility.AccessibilityNodeInfo

class MyAccessibilityService : AccessibilityService() {

    private val TAG = "MyAccessibilityServiceLog"
    private val TWITTER_PACKAGE_NAME = "com.twitter.android"

    override fun onServiceConnected() {
        super.onServiceConnected()
        Log.d(TAG, "onServiceConnected called.")
    }

    override fun onAccessibilityEvent(event: AccessibilityEvent?) {
        Log.d(TAG, "onAccessibilityEvent called. Event type: ${event?.eventType}, Package name: ${event?.packageName}")
        if (event?.packageName == TWITTER_PACKAGE_NAME) {
            Log.d(TAG, "Twitter app is currently active.")
        }
    }


    override fun onKeyEvent(event: KeyEvent?): Boolean {
        Log.d(TAG, "onKeyEvent: ${event?.keyCode.toString()}")
        event?.let {
            if (it.action == KeyEvent.ACTION_DOWN) {
                when (it.keyCode) {
                    KeyEvent.KEYCODE_VOLUME_UP -> {
                        Log.d(TAG, "Volume Up Pressed")
                        scroll(AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD)
                        return true
                    }
                    KeyEvent.KEYCODE_VOLUME_DOWN -> {
                        Log.d(TAG, "Volume Down Pressed")
                        scroll(AccessibilityNodeInfo.ACTION_SCROLL_FORWARD)
                        return true
                    }
                }
            }
        }
        return super.onKeyEvent(event)
    }

    private fun scroll(action: Int) {
        val rootNode = rootInActiveWindow ?: return
        for (i in 0 until rootNode.childCount) {
            val childNode = rootNode.getChild(i)
            if (childNode != null && childNode.isScrollable) {
                childNode.performAction(action)
                Log.d(TAG, "Performed Scroll Action")
            }
        }
    }

    override fun onInterrupt() {
        Log.d(TAG, "onInterrupt called.")
    }
}