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/**
 * Copyright 2016 Netflix, 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 rx.internal.operators;

import rx.*;
import rx.exceptions.Exceptions;
import rx.functions.Func1;

public final class SingleOperatorOnErrorResumeNext implements Single.OnSubscribe {

    private final Single originalSingle;
    final Func1> resumeFunctionInCaseOfError;

    private SingleOperatorOnErrorResumeNext(Single originalSingle, Func1> resumeFunctionInCaseOfError) {
        if (originalSingle == null) {
            throw new NullPointerException("originalSingle must not be null");
        }

        if (resumeFunctionInCaseOfError == null) {
            throw new NullPointerException("resumeFunctionInCaseOfError must not be null");
        }

        this.originalSingle = originalSingle;
        this.resumeFunctionInCaseOfError = resumeFunctionInCaseOfError;
    }

    public static  SingleOperatorOnErrorResumeNext withFunction(Single originalSingle, Func1> resumeFunctionInCaseOfError) {
        return new SingleOperatorOnErrorResumeNext(originalSingle, resumeFunctionInCaseOfError);
    }

    public static  SingleOperatorOnErrorResumeNext withOther(Single originalSingle, final Single resumeSingleInCaseOfError) {
        if (resumeSingleInCaseOfError == null) {
            throw new NullPointerException("resumeSingleInCaseOfError must not be null");
        }

        return new SingleOperatorOnErrorResumeNext(originalSingle, new Func1>() {
            @Override
            public Single call(Throwable throwable) {
                return resumeSingleInCaseOfError;
            }
        });
    }

    @Override
    public void call(final SingleSubscriber child) {
        final SingleSubscriber parent = new SingleSubscriber() {
            @Override
            public void onSuccess(T value) {
                child.onSuccess(value);
            }

            @Override
            public void onError(Throwable error) {
                try {
                    resumeFunctionInCaseOfError.call(error).subscribe(child);
                } catch (Throwable innerError) {
                    Exceptions.throwOrReport(innerError, child);
                }
            }
        };

        child.add(parent);
        originalSingle.subscribe(parent);
    }
}