BelajarMediatorLive

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() {

    private val _loginResult = MediatorLiveData<ResultState<LoginResult>>()
    val loginResult: LiveData<ResultState<LoginResult>> = _loginResult

    fun performLogin(email: String, password: String) {
        val resultLiveData = repository.login(email, password) // return LiveData

        _loginResult.addSource(resultLiveData) { result ->
            _loginResult.value = result
            if (result is ResultState.Success || result is ResultState.Error) {
                _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)))
        }
    }