class MyViewModel : ViewModel() {
    private val result =  MediatorLiveData<String>()
    private var expression: String = ""
    private val calRepo: CalcRepo = CalcRepo()

    private val _resultLiveData = MutableLiveData<String>()
    val resultLiveData: LiveData<String>
        get() = _resultLiveData

    init {
        result.addSource(calRepo.resultLiveData) {
            _resultLiveData.postValue(it)
        }
    }

    private val _expressionLiveData: MutableLiveData<String> = MutableLiveData()
    // mutable is getting value from the expressionLiveData so that view can't see the mutable
    val expressionLiveData: LiveData<String>
        get() = _expressionLiveData
    // takes any value from the View and wrappes it in a livedata wrapper and uses get() to move the data to the mutable


    // need to build a fun that changes + into %2B, Url doesn't compute + sign


    fun equals() {
        Log.d("bye", "equals triggered")

       calRepo.getResult(expression).toString()



    }