TheViewModel.kt

package com.ciru.practice



import androidx.lifecycle.ViewModel
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.StateFlow
import kotlinx.coroutines.flow.update

/**
 * This is the shared view model, that will be shared by the two composables (boo and bae) [honestly change the names]
 */
class  LoginViewModel : ViewModel(){
   /**
    * This represents our state I am using '_' to represent/show that it is an internal state
    * Whatever the user types will be put in LoginData and then the _loginData will be updated to the current login data
    * simply put
    * when user types email,password and username then he/she presses login button several things will happen
    * 1. A new LoginData() object will be created
    * 2. when [setUserDetails] will be invoked, the newly created LoginData() object will be passed into the function
    * 3. our internal state [_loginData] will reference the newly created object/the LoginData object held by
    * [_loginData] will be modified to represent the newly created LoginData() object.
    * I honestly hope this makes sense.
    */
   private val _loginData = MutableStateFlow<LoginData>(LoginData.EMPTY)
   val loginData:StateFlow<LoginData>
      get() = _loginData
   fun setUserDetails(loginData: LoginData){
      println("logging details: ${loginData.password},${loginData.username}, ${loginData.email}")
      _loginData.update {
         it.copy(email = loginData.email, username = loginData.username,
            password = loginData.password) }
   }
}







































//    class ViewModelA:ViewModel(){
//        private val _data = MutableStateFlow("")
//        val data:StateFlow<String>
//            get() = _data
//        fun setData(newData:String){
//            // or you can use _data.update{ }
//            _data.value = newData
//        }
//    }
//    // inject your view model instance into your composables in your activitiy's onCreate
//    @Composable
//    fun ScreenB(sharedViewModel:ViewModel){
//        val data = sharedViewModel.data.collectAsState(initial="")
//        // do something with it
//    }
//    @Composable
//    fun ScreenA(sharedViewModel:ViewModel){
//        sharedViewModel.setData("data")
//    }
//}