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/*
 * Copyright (C) 2015 Square, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package retrofit.mock;

import rx.Observable;
import rx.functions.Func1;

import static java.util.concurrent.TimeUnit.MILLISECONDS;

public final class RxJavaBehaviorAdapter implements NetworkBehavior.Adapter {
  public static RxJavaBehaviorAdapter create() {
    return new RxJavaBehaviorAdapter();
  }

  private RxJavaBehaviorAdapter() {
  }

  @Override public Object applyBehavior(NetworkBehavior behavior, Object value) {
    if (value instanceof Observable) {
      return applyObservableBehavior(behavior, (Observable) value);
    }
    String name = value.getClass().getCanonicalName();
    if ("rx.Single".equals(name)) {
      // Apply behavior to the Single from a separate class. This defers classloading such that
      // regular Observable operation can be leveraged without relying on this unstable RxJava API.
      return SingleHelper.applySingleBehavior(behavior, value);
    }
    throw new IllegalStateException("Unsupported type " + name);
  }

  public Observable applyObservableBehavior(final NetworkBehavior behavior,
      final Observable value) {
    return Observable.timer(behavior.calculateDelay(MILLISECONDS), MILLISECONDS)
        .flatMap(new Func1>() {
          @Override public Observable call(Long ignored) {
            if (behavior.calculateIsFailure()) {
              return Observable.error(behavior.failureException());
            }
            return value;
          }
        });
  }
}