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RoomDBViewModel.kt
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RoomDBViewModel.kt
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package me.amitshekhar.learn.kotlin.coroutines.ui.room
import androidx.lifecycle.LiveData
import androidx.lifecycle.MutableLiveData
import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import kotlinx.coroutines.launch
import me.amitshekhar.learn.kotlin.coroutines.data.api.ApiHelper
import me.amitshekhar.learn.kotlin.coroutines.data.local.DatabaseHelper
import me.amitshekhar.learn.kotlin.coroutines.data.local.entity.User
import me.amitshekhar.learn.kotlin.coroutines.ui.base.UiState
class RoomDBViewModel(private val apiHelper: ApiHelper, private val dbHelper: DatabaseHelper) :
ViewModel() {
private val uiState = MutableLiveData<UiState<List<User>>>()
init {
fetchUsers()
}
private fun fetchUsers() {
viewModelScope.launch {
uiState.postValue(UiState.Loading)
try {
val usersFromDb = dbHelper.getUsers()
if (usersFromDb.isEmpty()) {
val usersFromApi = apiHelper.getUsers()
val usersToInsertInDB = mutableListOf<User>()
for (apiUser in usersFromApi) {
val user = User(
apiUser.id,
apiUser.name,
apiUser.email,
apiUser.avatar
)
usersToInsertInDB.add(user)
}
dbHelper.insertAll(usersToInsertInDB)
uiState.postValue(UiState.Success(usersToInsertInDB))
} else {
uiState.postValue(UiState.Success(usersFromDb))
}
} catch (e: Exception) {
uiState.postValue(UiState.Error("Something Went Wrong"))
}
}
}
fun getUiState(): LiveData<UiState<List<User>>> {
return uiState
}
}