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package io.proximax.utils;

import io.proximax.async.AsyncCallbacks;
import io.proximax.async.AsyncTask;
import io.reactivex.Observable;

import static io.proximax.utils.ParameterValidationUtils.checkParameter;

/**
 * The utility class for handling async calls
 */
public class AsyncUtils {

    private AsyncUtils() {
    }

    /**
     * Observe for the first item on the Observable then invoke callbacks from AsyncCallbacks using result.
     * Finally, update AsyncStatus to done.
     * @param observable the observable
     * @param asyncCallbacks the async callbacks
     * @param asyncTask the async task that contains the state
     * @param  the result type
     */
    public static  void processFirstItem(Observable observable, AsyncCallbacks asyncCallbacks, AsyncTask asyncTask) {
        checkParameter(observable != null, "observable is required");
        checkParameter(asyncTask != null, "asyncTask is required");

        observable.firstOrError()
                .subscribe(
                        result -> {
                            if (asyncCallbacks != null) {
                                asyncCallbacks.onSuccess(result);
                            }
                            asyncTask.done();
                        }, throwable -> {
                            if (asyncCallbacks != null) {
                                asyncCallbacks.onFailure(throwable);
                            }
                            asyncTask.done();
                        });
    }
}