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/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * 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 org.neo4j.driver.internal.reactive;

import static org.neo4j.driver.internal.reactive.RxUtils.createEmptyPublisher;

import java.util.concurrent.CompletableFuture;
import org.neo4j.driver.Query;
import org.neo4j.driver.internal.async.UnmanagedTransaction;
import org.neo4j.driver.internal.cursor.RxResultCursor;
import org.neo4j.driver.internal.util.Futures;
import org.neo4j.driver.reactive.RxResult;
import org.neo4j.driver.reactive.RxTransaction;
import org.reactivestreams.Publisher;

public class InternalRxTransaction extends AbstractRxQueryRunner implements RxTransaction {
    private final UnmanagedTransaction tx;

    public InternalRxTransaction(UnmanagedTransaction tx) {
        this.tx = tx;
    }

    @Override
    public RxResult run(Query query) {
        return new InternalRxResult(() -> {
            CompletableFuture cursorFuture = new CompletableFuture<>();
            tx.runRx(query).whenComplete((cursor, completionError) -> {
                if (cursor != null) {
                    cursorFuture.complete(cursor);
                } else {
                    // We failed to create a result cursor so we cannot rely on result cursor to handle failure.
                    // The logic here shall be the same as `TransactionPullResponseHandler#afterFailure` as that is
                    // where cursor handling failure
                    // This is optional as tx still holds a reference to all cursor futures and they will be clean up
                    // properly in commit
                    Throwable error = Futures.completionExceptionCause(completionError);
                    tx.markTerminated(error);
                    cursorFuture.completeExceptionally(error);
                }
            });
            return cursorFuture;
        });
    }

    @Override
    public  Publisher commit() {
        return createEmptyPublisher(tx::commitAsync);
    }

    @Override
    public  Publisher rollback() {
        return createEmptyPublisher(tx::rollbackAsync);
    }

    public Publisher close() {
        return close(false);
    }

    Publisher close(boolean commit) {
        return createEmptyPublisher(() -> tx.closeAsync(commit));
    }
}