androidApp/src/main/java/mx/trackermap/TrackerMap/android/session/LoginViewModel.kt


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package mx.trackermap.TrackerMap.android.session

import android.util.Log
import androidx.lifecycle.MutableLiveData
import androidx.lifecycle.SavedStateHandle
import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import com.zhuinden.eventemitter.EventEmitter
import com.zhuinden.eventemitter.EventSource
import kotlinx.coroutines.launch
import mx.trackermap.TrackerMap.client.apis.SessionApi

class LoginViewModel(
    private val sessionApi: SessionApi,
    savedStateHandle: SavedStateHandle
) : ViewModel() {

    sealed class LoginState {
        object Loading: LoginState()
        object EmailMissing : LoginState()
        object PasswordMissing : LoginState()
        object Failure : LoginState()
        object Success : LoginState()
    }

    val email: MutableLiveData<String> = savedStateHandle.getLiveData("user", "")
    val password: MutableLiveData<String> = savedStateHandle.getLiveData("password", "")

    private val loginStateEmitter = EventEmitter<LoginState>()
    val loginState: EventSource<LoginState> = loginStateEmitter

    fun restoreSession() {
        loginStateEmitter.emit(LoginState.Loading);
        viewModelScope.launch {
            try {
                val user = sessionApi.sessionGet()
                Log.d("LoginViewModel", user.toString())
                loginStateEmitter.emit(LoginState.Success)
            } catch (e: Exception) {
                Log.d("LoginViewModel", "No session")
            }
        }
    }

    fun login() {
        val email = email.value!!.toString().trim()
        val password = password.value!!.toString().trim()

        if (email.isEmpty()) {
            loginStateEmitter.emit(LoginState.EmailMissing)
            return
        }

        if (password.isEmpty()) {
            loginStateEmitter.emit(LoginState.PasswordMissing)
            return
        }

        loginStateEmitter.emit(LoginState.Loading)
        viewModelScope.launch {
            try {
                val user = sessionApi.sessionPost(email, password)
                Log.d("LoginViewModel", user.toString())
                loginStateEmitter.emit(LoginState.Success)
            } catch (e: Exception) {
                loginStateEmitter.emit(LoginState.Failure)
            }
        }
    }
}