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.
/**
 * 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.internal.operators.completable;

import io.reactivex.*;
import io.reactivex.disposables.Disposable;
import io.reactivex.exceptions.*;
import io.reactivex.functions.*;
import io.reactivex.internal.disposables.*;
import io.reactivex.plugins.RxJavaPlugins;

public final class CompletablePeek extends Completable {

    final CompletableSource source;
    final Consumer<? super Disposable> onSubscribe;
    final Consumer<? super Throwable> onError;
    final Action onComplete;
    final Action onTerminate;
    final Action onAfterTerminate;
    final Action onDispose;

    public CompletablePeek(CompletableSource source, Consumer<? super Disposable> onSubscribe,
                           Consumer<? super Throwable> onError,
                           Action onComplete,
                           Action onTerminate,
                           Action onAfterTerminate,
                           Action onDispose) {
        this.source = source;
        this.onSubscribe = onSubscribe;
        this.onError = onError;
        this.onComplete = onComplete;
        this.onTerminate = onTerminate;
        this.onAfterTerminate = onAfterTerminate;
        this.onDispose = onDispose;
    }

    @Override
    protected void subscribeActual(final CompletableObserver observer) {

        source.subscribe(new CompletableObserverImplementation(observer));
    }

    final class CompletableObserverImplementation implements CompletableObserver, Disposable {

        final CompletableObserver downstream;

        Disposable upstream;

        CompletableObserverImplementation(CompletableObserver downstream) {
            this.downstream = downstream;
        }

        @Override
        public void onSubscribe(final Disposable d) {
            try {
                onSubscribe.accept(d);
            } catch (Throwable ex) {
                Exceptions.throwIfFatal(ex);
                d.dispose();
                this.upstream = DisposableHelper.DISPOSED;
                EmptyDisposable.error(ex, downstream);
                return;
            }
            if (DisposableHelper.validate(this.upstream, d)) {
                this.upstream = d;
                downstream.onSubscribe(this);
            }
        }

        @Override
        public void onError(Throwable e) {
            if (upstream == DisposableHelper.DISPOSED) {
                RxJavaPlugins.onError(e);
                return;
            }
            try {
                onError.accept(e);
                onTerminate.run();
            } catch (Throwable ex) {
                Exceptions.throwIfFatal(ex);
                e = new CompositeException(e, ex);
            }

            downstream.onError(e);

            doAfter();
        }

        @Override
        public void onComplete() {
            if (upstream == DisposableHelper.DISPOSED) {
                return;
            }

            try {
                onComplete.run();
                onTerminate.run();
            } catch (Throwable e) {
                Exceptions.throwIfFatal(e);
                downstream.onError(e);
                return;
            }

            downstream.onComplete();

            doAfter();
        }

        void doAfter() {
            try {
                onAfterTerminate.run();
            } catch (Throwable ex) {
                Exceptions.throwIfFatal(ex);
                RxJavaPlugins.onError(ex);
            }
        }

        @Override
        public void dispose() {
            try {
                onDispose.run();
            } catch (Throwable e) {
                Exceptions.throwIfFatal(e);
                RxJavaPlugins.onError(e);
            }
            upstream.dispose();
        }

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