package mx.trackermap.TrackerMap.android.session

import android.util.Log
import androidx.lifecycle.LiveData
import androidx.lifecycle.MutableLiveData
import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import com.zhuinden.eventemitter.EventEmitter
import com.zhuinden.eventemitter.EventSource
import kotlinx.coroutines.DelicateCoroutinesApi
import kotlinx.coroutines.flow.collect
import kotlinx.coroutines.launch
import mx.trackermap.TrackerMap.client.models.User
import mx.trackermap.TrackerMap.controllers.SessionController
import org.koin.core.component.KoinComponent
import org.koin.core.component.inject

@DelicateCoroutinesApi
class UserInformationViewModel : ViewModel(), KoinComponent {

    private val sessionController: SessionController by inject()

    init {
        Log.d("UserInformationVM", "Initializing User Information View Model")
    }

    private val _user = MutableLiveData<User>()
    val user: LiveData<User> get() = _user

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

    init {
        viewModelScope.launch {
            setupLoginStateObserver()
        }
        viewModelScope.launch {
            setupUserObserver()
        }
    }

    private suspend fun setupLoginStateObserver() {
        sessionController.loginStateFlow.collect {
            it?.let {
                loginStateEmitter.emit(it)
            }
        }
    }

    private suspend fun setupUserObserver() {
        sessionController.userFlow.collect {
            it?.let {
                _user.postValue(it)
            }
        }
    }

    fun fetchUserInfo() {
        viewModelScope.launch {
            loginStateEmitter.emit(SessionController.LoginState.Loading)
            try {
                sessionController.getSession()
                loginStateEmitter.emit(SessionController.LoginState.Success)
            } catch (e: Exception) {
                loginStateEmitter.emit(SessionController.LoginState.Failure)
            }
        }
    }

    fun signOut(token: String?) {
        viewModelScope.launch {
            sessionController.logout(token)
        }
    }
}