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SleepTrackerViewModel.kt
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SleepTrackerViewModel.kt
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/*
* Copyright 2019, The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.example.android.trackmysleepquality.sleeptracker
import android.app.Application
import androidx.lifecycle.AndroidViewModel
import androidx.lifecycle.MutableLiveData
import androidx.lifecycle.Transformations
import com.example.android.trackmysleepquality.database.SleepDatabaseDao
import com.example.android.trackmysleepquality.database.SleepNight
import com.example.android.trackmysleepquality.formatNights
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.Job
import kotlinx.coroutines.launch
import kotlinx.coroutines.withContext
/**
* ViewModel for SleepTrackerFragment.
*/
class SleepTrackerViewModel(
val database: SleepDatabaseDao,
application: Application) : AndroidViewModel(application) {
private var viewModelJob = Job()
private val uiScope = CoroutineScope(Dispatchers.Main + viewModelJob)
private val nights = database.getAllNights()
val nightsString = Transformations.map(nights) { nights ->
formatNights(nights, application.resources)
}
private var tonight = MutableLiveData<SleepNight?>()
init {
initializeTonight()
}
private fun initializeTonight() {
uiScope.launch {
tonight.value = getTonightFromDatabase()
}
}
private suspend fun getTonightFromDatabase(): SleepNight? {
return withContext(Dispatchers.IO) {
var night = database.getTonight()
if (night?.endTimeMilli != night?.startTimeMilli) {
night = null
}
night
}
}
fun onStartTracking() {
uiScope.launch {
val newNight = SleepNight()
insert(newNight)
tonight.value = getTonightFromDatabase()
}
}
private suspend fun insert(night: SleepNight) {
withContext(Dispatchers.IO) {
database.insert(night)
}
}
fun onStopTracking() {
uiScope.launch {
val oldNight = tonight.value ?: return@launch
oldNight.endTimeMilli = System.currentTimeMillis()
update(oldNight)
}
}
private suspend fun update(night: SleepNight) {
withContext(Dispatchers.IO) {
database.update(night)
}
}
fun onClear() {
uiScope.launch {
clear()
tonight.value = null
}
}
suspend fun clear() {
withContext(Dispatchers.IO) {
database.clear()
}
}
override fun onCleared() {
super.onCleared()
viewModelJob.cancel()
}
}