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/*
 * Copyright 2017-2020 original authors
 *
 * 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
 *
 * https://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.micronaut.configuration.jdbi.transaction.spring;

import io.micronaut.configuration.jdbi.transaction.AbstractTransactionHandler;
import io.micronaut.context.annotation.EachBean;
import io.micronaut.context.annotation.Requires;
import org.jdbi.v3.core.Handle;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.TransactionDefinition;
import org.springframework.transaction.TransactionStatus;
import org.springframework.transaction.support.DefaultTransactionDefinition;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Consumer;

/**
 * Allows Spring Transaction to be used with Jdbi.
 *
 * @author Dan Maas
 * @since 1.4.0
 */
@Requires(classes = PlatformTransactionManager.class)
@EachBean(PlatformTransactionManager.class)
public class SpringTransactionHandler extends AbstractTransactionHandler {

    private final ConcurrentHashMap localStuff = new ConcurrentHashMap<>();

    private final PlatformTransactionManager transactionManager;

    /**
     * Adapt a {@link PlatformTransactionManager} to Jdbi transaction provider interface.
     *
     * @param transactionManager The transaction manager
     */
    public SpringTransactionHandler(PlatformTransactionManager transactionManager) {
        this.transactionManager = transactionManager;
    }

    @Override
    public void begin(Handle handle) {
        TransactionDefinition definition = new DefaultTransactionDefinition(TransactionDefinition.PROPAGATION_NESTED);
        TransactionStatus status = this.transactionManager.getTransaction(definition);
        this.localStuff.putIfAbsent(handle, new LocalStuff(status));
    }

    @Override
    public void commit(Handle handle) {
        withLocalStuff(handle, (localStuff) -> {
            try {
                this.transactionManager.commit(localStuff.getTransactionStatus());
            } finally {
                restore(handle);
            }
        });
    }

    @Override
    public void rollback(Handle handle) {
        didTxnRollback.set(true);
        withLocalStuff(handle, (localStuff) -> {
            try {
                this.transactionManager.rollback(localStuff.getTransactionStatus());
            } finally {
                restore(handle);
            }
        });
    }

    @Override
    public boolean isInTransaction(Handle handle) {
        TransactionStatus status = getTransactionStatus(handle);
        return status != null && !status.isCompleted();
    }

    @Override
    public void savepoint(Handle handle, String savepointName) {
        withLocalStuff(handle, (localStuff) -> {
            Object savePoint = localStuff.getTransactionStatus().createSavepoint();
            localStuff.getSavepoints().put(savepointName, savePoint);
        });
    }

    @Override
    public void rollbackToSavepoint(Handle handle, String savepointName) {
        withLocalStuff(handle, (localStuff) -> {
            Object savePoint = localStuff.getSavepoints().get(savepointName);
            if (savePoint != null) {
                localStuff.getTransactionStatus().rollbackToSavepoint(savePoint);
            }
        });
    }

    @Override
    public void releaseSavepoint(Handle handle, String savepointName) {
        withLocalStuff(handle, (localStuff) -> {
            Object savePoint = localStuff.getSavepoints().remove(savepointName);
            if (savePoint != null) {
                localStuff.getTransactionStatus().releaseSavepoint(savePoint);
            }
        });
    }

    private TransactionStatus getTransactionStatus(Handle handle) {
        LocalStuff localStuff = this.localStuff.get(handle);
        return localStuff != null ? localStuff.getTransactionStatus() : null;
    }

    private void withLocalStuff(Handle handle, Consumer consumer) {
        LocalStuff localStuff = this.localStuff.get(handle);
        if (localStuff != null) {
            consumer.accept(localStuff);
        }
    }

    private void restore(final Handle handle) {
        try {
            final LocalStuff stuff = this.localStuff.remove(handle);
            if (stuff != null) {
                stuff.getSavepoints().clear();
            }
        } finally {
            // prevent memory leak if rollback throws an exception
            this.localStuff.remove(handle);
        }
    }

    /**
     * Local transaction definition.
     */
    private static class LocalStuff {

        private final Map savepoints = new HashMap<>();

        private final TransactionStatus transactionStatus;

        LocalStuff(TransactionStatus transactionStatus) {
            this.transactionStatus = transactionStatus;
        }

        Map getSavepoints() {
            return savepoints;
        }

        TransactionStatus getTransactionStatus() {
            return transactionStatus;
        }

    }

}