# AsyncCheckBox.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
     * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
     * SOFTWARE.
     */

    package dk.nsp.mingraviditet.ui.widgets

    import androidx.databinding.ObservableField
    import androidx.lifecycle.ViewModel
    import dk.nsp.mingraviditet.R

    enum class CheckboxMode {
        Checked, Unchecked, Loading;

        fun getBackground(): Int? {
            return when (this) {
                Checked -> R.drawable.checkbox_checked_with_drawable
                Unchecked -> R.drawable.checkbox_unchecked
                Loading -> null
            }
        }
    }

    class AsyncCheckBoxViewModel : ViewModel() {

        private val _currentMode: ObservableField<CheckboxMode> =
            ObservableField<CheckboxMode>(CheckboxMode.Unchecked)

        val currentMode: ObservableField<CheckboxMode> = _currentMode

        var onModeChanged: ((CheckboxMode) -> Unit)? = null

        fun setChecked(checked: Boolean) {
            when (checked) {
                true -> _currentMode.set(CheckboxMode.Checked)
                false -> _currentMode.set(CheckboxMode.Unchecked)
            }
        }

        fun onCheckedToggle() {
            val checked = _currentMode.get() ?: CheckboxMode.Unchecked

            _currentMode.set(CheckboxMode.Loading)

            when (checked) {
                CheckboxMode.Checked -> {
                    onModeChanged?.invoke(CheckboxMode.Unchecked)
                }
                CheckboxMode.Unchecked -> {
                    onModeChanged?.invoke(CheckboxMode.Checked)
                }
                else -> {
                }
            }

        }
    }