CurrenciesFragment.kt

CurrenciesFragment.kt

private fun initViewModel() {
    // Fetch Latest Currencies
    with(currenciesViewModel) {
        observe(getLatestCurrenciesLiveData(), ::observeCurrencies)
        fetchCurrencies()
    }
}

private fun observeCurrencies(result: Result<UiCurrencies>?) {
    when (result) {
        is Result.OnLoading -> currenciesViewModel.isLoading.set(true)
        is Result.OnSuccess -> {
            currenciesViewModel.isLoading.set(false)
            setLatestCurrenciesData(result.value)
        }
        is Result.OnError -> showErrorView()
        else -> showErrorView()
    }
}

private fun fetchCurrencies() {
    currenciesViewModel.apply {
        getLatestCurrenciesLiveData().value?.let { result ->
            setLatestCurrenciesData((result as? Result.OnSuccess)?.value)
        } ?: run {
            isLoading.set(true)
            getLatestCurrenciesData()
        }
    }
}