MainActivity.kt

package com.dinophan.authapp.ui.activities

import android.view.View
import com.dinophan.authapp.R
import com.dinophan.authapp.bases.BaseActivity
import com.dinophan.authapp.databinding.ActivityMainBinding
import com.dinophan.authapp.models.UserModel
import com.dinophan.authapp.modules.mock.APIMock
import io.reactivex.Observable
import io.reactivex.android.schedulers.AndroidSchedulers
import io.reactivex.schedulers.Schedulers

class MainActivity : BaseActivity<ActivityMainBinding>(R.layout.activity_main) {

    private val userData: UserModel = UserModel()

    override fun onActivityCreated(dataBinder: ActivityMainBinding) {
        dataBinder.presenter            = Presenter()
        dataBinder.isRegisterationState = false
        dataBinder.isFormSubmitting     = false
        dataBinder.isFormValidated      = this@MainActivity.userData.validates()
    }

    @Suppress("UNUSED_PARAMETER")
    inner class Presenter {

        private var confirmationPassword: String = String()

        fun onUsernameChanged(text: CharSequence, start: Int, before: Int, count: Int) {
            this@MainActivity.userData.username = text.toString()
            this@Presenter.validates()
        }

        fun onPasswordChanged(text: CharSequence, start: Int, before: Int, count: Int) {
            this@MainActivity.userData.password = text.toString()
            this@Presenter.validates()
        }

        fun onConfirmationPasswordChanged(text: CharSequence, start: Int, before: Int, count: Int) {
            this@Presenter.confirmationPassword = text.toString()
            this@Presenter.validates()
        }

        fun onToggleRegisterationState(view: View) {
            this@MainActivity.getBinder()?.isRegisterationState = !(this@MainActivity.getBinder()?.isRegisterationState ?: false)
            this@Presenter.validates()
        }

        fun onFormSubmit(view: View) {

        }

        private fun validates() {
            this@MainActivity.getBinder()?.isFormValidated  = this@MainActivity.userData.validates(if (this@MainActivity.getBinder()?.isRegisterationState == true) this@Presenter.confirmationPassword else null)
            this@MainActivity.getBinder()?.formErrorMessage = this@MainActivity.userData.errorMessage
        }

    }

}