# KeyboardViewModel.kt

    /*
     * The MIT License
     *
     * Original work sponsored and donated by The Danish Health Data Authority (http://www.sundhedsdatastyrelsen.dk)
     *
     * Copyright (C) 2021 The Danish Health Data Authority (http://www.sundhedsdatastyrelsen.dk)
     *
     *
     * Permission is hereby granted, free of charge, to any person obtaining a copy of
     * this software and associated documentation files (the "Software"), to deal in
     * the Software without restriction, including without limitation the rights to
     * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
     * of the Software, and to permit persons to whom the Software is furnished to do
     * so, subject to the following conditions:
     *
     *
     * The above copyright notice and this permission notice shall be included in all
     * copies or substantial portions of the Software.
     *
     *
     * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
     * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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    package dk.nsp.mingraviditet.ui.useradmission.login.keyboard

    import androidx.lifecycle.MutableLiveData
    import androidx.lifecycle.ViewModel
    import dk.nsp.mingraviditet.util.extensions.getValue
    import dk.nsp.mingraviditet.util.extensions.postSingleEvent
    import dk.nsp.mingraviditet.util.livedata.SingleEvent

    class KeyboardViewModel : ViewModel() {
        private val pinLength = 4

        private val _pinEntered: MutableLiveData<String> = MutableLiveData()
        val onPinChangedListener by _pinEntered

        private val _onBiometricPressed: MutableLiveData<SingleEvent<Unit>> = MutableLiveData()
        val onBiometricPressed by _onBiometricPressed

        fun keyboardInput(pinNumber: Int) {
            val existingPin = _pinEntered.value ?: ""
            val newPin = existingPin + pinNumber

            if (existingPin.length < pinLength) {
                _pinEntered.postValue(newPin)
            }
        }

        fun deleteLast() {
            val existingPin = _pinEntered.value ?: return
            _pinEntered.postValue(existingPin.dropLast(1))
        }

        fun openBiometricDialog() {
            _onBiometricPressed.postSingleEvent()
        }

        fun clearPin() {
            _pinEntered.postValue("")
        }
    }