sensor

package com.mrtechy.gfg_sensor

import android.hardware.Sensor
import android.hardware.SensorEvent
import android.hardware.SensorEventListener
import android.hardware.SensorManager
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.TextView
import androidx.appcompat.app.AppCompatDelegate

class MainActivity : AppCompatActivity(), SensorEventListener {

	// Initialised sensorManager & two variables
	// for storing brightness value
	private lateinit var sensorManager: SensorManager
	private var brightness: Sensor? = null
	private lateinit var text: TextView

	override fun onCreate(savedInstanceState: Bundle?) {
		super.onCreate(savedInstanceState)
		setContentView(R.layout.activity_main)
		
		// Set default nightmode
		AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO)

		// searched our textview id and stored it
		text = findViewById(R.id.tv_text)

		// setupSensor Called
		setUpSensor()
	}

	// Declared setupSensor function
	private fun setUpSensor() {
	sensorManager = getSystemService(SENSOR_SERVICE) as SensorManager
	brightness = sensorManager.getDefaultSensor(Sensor.TYPE_LIGHT)
	}

	// These are two methods from sensorEventListner Interface
	override fun onSensorChanged(event: SensorEvent?) {
		if (event?.sensor?.type == Sensor.TYPE_LIGHT) {
			val light1 = event.values[0]

			text.text = "Sensor: $light1\n${brightness(light1)}"
		}
	}
	override fun onAccuracyChanged(sensor: Sensor?, accuracy: Int) {
		return
	}
	
	// Created a function to show messages according to the brightness
	private fun brightness(brightness: Float): String {

		return when (brightness.toInt()) {
			0 -> "Pitch black"
			in 1..10 -> "Dark"
			in 11..50 -> "Grey"
			in 51..5000 -> "Normal"
			in 5001..25000 -> "Incredibly bright"
			else -> "This light will blind you"
		}
	}

	// This is onResume function of our app
	override fun onResume() {
		super.onResume()
		sensorManager.registerListener(this, brightness, SensorManager.SENSOR_DELAY_NORMAL)
	}

	// This is onPause function of our app
	override fun onPause() {
		super.onPause()
		sensorManager.unregisterListener(this)
	}
}