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/*
 * Copyright (C) 2015 Contentful GmbH
 *
 * 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 com.contentful.vault;

import java.util.List;
import rx.Observable;
import rx.Subscriber;

public final class ObserveQuery extends AbsQuery> {
  ObserveQuery(Class type, Vault vault) {
    super(type, vault);
  }

  public Observable all() {
    return all(null);
  }

  public Observable all(String locale) {
    return Observable.create(new AllOnSubscribe(this, locale));
  }

  static class AllOnSubscribe implements Observable.OnSubscribe {
    private final ObserveQuery query;
    private final String locale;

    public AllOnSubscribe(ObserveQuery query, String locale) {
      this.query = query;
      this.locale = locale;
    }

    @Override public void call(Subscriber subscriber) {
      try {
        FetchQuery fetchQuery = query.vault().fetch(query.type());
        fetchQuery.setParams(query.params());
        List items = fetchQuery.all(locale);
        for (T item : items) {
          if (subscriber.isUnsubscribed()) {
            return;
          }
          subscriber.onNext(item);
        }
      } catch (Throwable t) {
        if (!subscriber.isUnsubscribed()) {
          subscriber.onError(t);
        }
        return;
      }
      if (!subscriber.isUnsubscribed()) {
        subscriber.onCompleted();
      }
    }
  }
}