BelajarMediatorLive

eveeeeef21

Jun 29th, 2025 (edited)

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package com.example.storyapp.ui.login
import androidx.lifecycle.LiveData
import androidx.lifecycle.MediatorLiveData
import androidx.lifecycle.ViewModel
import com.example.storyapp.data.response.auth.LoginResult
import com.example.storyapp.di.Repository
import com.example.storyapp.utils.ResultState
class LoginViewModel(private val repository: Repository) : ViewModel() {
fun performLogin2(email: String, password: String): LiveData<ResultState<LoginResult>> =
repository.login(email, password)
// 1. Terapkan enkapsulasi. ViewModel memiliki state-nya sendiri.
private val _loginResult = MediatorLiveData<ResultState<LoginResult>>()
val loginResult: LiveData<ResultState<LoginResult>> = _loginResult
// 2. Buat fungsi yang dipanggil UI untuk *memulai* proses login.
// Fungsi ini tidak mengembalikan apa-apa (Unit).
fun performLogin(email: String, password: String) {
// Panggil fungsi repository yang mengembalikan LiveData
val resultLiveData = repository.login(email, password)
// 3. Tempelkan (source) LiveData dari repository ke LiveData internal ViewModel.
_loginResult.addSource(resultLiveData) { result ->
// 4. Update nilai LiveData internal dengan hasil dari repository.
_loginResult.value = result
// Hapus source setelah mendapatkan hasil agar tidak ada duplikasi observer
_loginResult.removeSource(resultLiveData)
}
}
}
// di kelas Repository
fun login(
email: String,
password: String
): LiveData<ResultState<LoginResult>> = liveData {
emit(ResultState.Loading)
try {
val response = apiService.login(email, password)
if (!response.error) {
val loginResult = response.loginResult
userPreference.saveSession(loginResult) // Menyimpan data login ke sesi
emit(ResultState.Success(loginResult))
} else {
emit(ResultState.Error(ErrorType.ApiError(response.message)))
}
} catch (e: HttpException) {
if (e.code() == 401) {
emit(ResultState.Error(ErrorType.ResourceError(R.string.error_wrong_credentials)))
} else {
val errorBody = e.response()?.errorBody()?.string()
val errorResponse = Gson().fromJson(errorBody, LoginResponse::class.java)
emit(ResultState.Error(ErrorType.ApiError(errorResponse.message)))
}
} catch (e: Exception) {
emit(ResultState.Error(ErrorType.ResourceError(R.string.login_failed)))
}
}

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