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/**
 * Copyright (c) 2016-present, RxJava Contributors.
 *
 * 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 io.reactivex.observable.internal.operators;

import java.util.Collection;
import java.util.concurrent.Callable;

import io.reactivex.common.Disposable;
import io.reactivex.common.exceptions.Exceptions;
import io.reactivex.common.internal.disposables.DisposableHelper;
import io.reactivex.common.internal.functions.*;
import io.reactivex.observable.*;
import io.reactivex.observable.extensions.FuseToObservable;
import io.reactivex.observable.internal.disposables.EmptyDisposable;

public final class ObservableToListSingle>
extends Single implements FuseToObservable {

    final ObservableSource source;

    final Callable collectionSupplier;

    @SuppressWarnings({ "unchecked", "rawtypes" })
    public ObservableToListSingle(ObservableSource source, final int defaultCapacityHint) {
        this.source = source;
        this.collectionSupplier = (Callable)Functions.createArrayList(defaultCapacityHint);
    }

    public ObservableToListSingle(ObservableSource source, Callable collectionSupplier) {
        this.source = source;
        this.collectionSupplier = collectionSupplier;
    }

    @Override
    public void subscribeActual(SingleObserver t) {
        U coll;
        try {
            coll = ObjectHelper.requireNonNull(collectionSupplier.call(), "The collectionSupplier returned a null collection. Null values are generally not allowed in 2.x operators and sources.");
        } catch (Throwable e) {
            Exceptions.throwIfFatal(e);
            EmptyDisposable.error(e, t);
            return;
        }
        source.subscribe(new ToListObserver(t, coll));
    }

    @Override
    public Observable fuseToObservable() {
        return RxJavaObservablePlugins.onAssembly(new ObservableToList(source, collectionSupplier));
    }

    static final class ToListObserver> implements Observer, Disposable {
        final SingleObserver actual;

        U collection;

        Disposable s;

        ToListObserver(SingleObserver actual, U collection) {
            this.actual = actual;
            this.collection = collection;
        }

        @Override
        public void onSubscribe(Disposable s) {
            if (DisposableHelper.validate(this.s, s)) {
                this.s = s;
                actual.onSubscribe(this);
            }
        }


        @Override
        public void dispose() {
            s.dispose();
        }

        @Override
        public boolean isDisposed() {
            return s.isDisposed();
        }


        @Override
        public void onNext(T t) {
            collection.add(t);
        }

        @Override
        public void onError(Throwable t) {
            collection = null;
            actual.onError(t);
        }

        @Override
        public void onComplete() {
            U c = collection;
            collection = null;
            actual.onSuccess(c);
        }
    }
}