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package com.github.datalking.jdbc.transaction;

import com.github.datalking.util.Assert;
import com.github.datalking.util.ClassUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.List;


/**
 * Utility methods for triggering specific {@link TransactionSynchronization}
 * callback methods on all currently registered synchronizations.
 */
public abstract class TransactionSynchronizationUtils {

    private static final Logger logger = LoggerFactory.getLogger(TransactionSynchronizationUtils.class);

    private static final boolean aopAvailable = ClassUtils.isPresent(
            "org.springframework.aop.scope.ScopedObject",
            TransactionSynchronizationUtils.class.getClassLoader());


    /**
     * Check whether the given resource transaction managers refers to the given
     * (underlying) resource factory.
     */
    public static boolean sameResourceFactory(ResourceTransactionManager tm, Object resourceFactory) {
        return unwrapResourceIfNecessary(tm.getResourceFactory()).equals(unwrapResourceIfNecessary(resourceFactory));
    }

    /**
     * Unwrap the given resource handle if necessary; otherwise return
     * the given handle as-is.
     */
    static Object unwrapResourceIfNecessary(Object resource) {
        Assert.notNull(resource, "Resource must not be null");
        Object resourceRef = resource;
        // unwrap infrastructure proxy
//		if (resourceRef instanceof InfrastructureProxy) {
//			resourceRef = ((InfrastructureProxy) resourceRef).getWrappedObject();
//		}
//		if (aopAvailable) {
//			// now unwrap scoped proxy
//			resourceRef = ScopedProxyUnwrapper.unwrapIfNecessary(resourceRef);
//		}
        return resourceRef;
    }


    /**
     * Trigger {@code flush} callbacks on all currently registered synchronizations.
     *
     * @throws RuntimeException if thrown by a {@code flush} callback
     * @see TransactionSynchronization#flush()
     */
    public static void triggerFlush() {
        for (TransactionSynchronization synchronization : TransactionSynchronizationManager.getSynchronizations()) {
            synchronization.flush();
        }
    }

    /**
     * Trigger {@code beforeCommit} callbacks on all currently registered synchronizations.
     *
     * @param readOnly whether the transaction is defined as read-only transaction
     * @throws RuntimeException if thrown by a {@code beforeCommit} callback
     * @see TransactionSynchronization#beforeCommit(boolean)
     */
    public static void triggerBeforeCommit(boolean readOnly) {
        for (TransactionSynchronization synchronization : TransactionSynchronizationManager.getSynchronizations()) {
            synchronization.beforeCommit(readOnly);
        }
    }

    /**
     * Trigger {@code beforeCompletion} callbacks on all currently registered synchronizations.
     *
     * @see TransactionSynchronization#beforeCompletion()
     */
    public static void triggerBeforeCompletion() {
        for (TransactionSynchronization synchronization : TransactionSynchronizationManager.getSynchronizations()) {
            try {
                synchronization.beforeCompletion();
            } catch (Throwable tsex) {
                logger.error("TransactionSynchronization.beforeCompletion threw exception", tsex);
            }
        }
    }

    /**
     * Trigger {@code afterCommit} callbacks on all currently registered synchronizations.
     *
     * @throws RuntimeException if thrown by a {@code afterCommit} callback
     * @see TransactionSynchronizationManager#getSynchronizations()
     * @see TransactionSynchronization#afterCommit()
     */
    public static void triggerAfterCommit() {
        invokeAfterCommit(TransactionSynchronizationManager.getSynchronizations());
    }

    /**
     * Actually invoke the {@code afterCommit} methods of the
     * given Spring TransactionSynchronization objects.
     *
     * @param synchronizations List of TransactionSynchronization objects
     * @see TransactionSynchronization#afterCommit()
     */
    public static void invokeAfterCommit(List synchronizations) {
        if (synchronizations != null) {
            for (TransactionSynchronization synchronization : synchronizations) {
                synchronization.afterCommit();
            }
        }
    }

    /**
     * Trigger {@code afterCompletion} callbacks on all currently registered synchronizations.
     *
     * @param completionStatus the completion status according to the
     *                         constants in the TransactionSynchronization interface
     * @see TransactionSynchronizationManager#getSynchronizations()
     */
    public static void triggerAfterCompletion(int completionStatus) {
        List synchronizations = TransactionSynchronizationManager.getSynchronizations();
        invokeAfterCompletion(synchronizations, completionStatus);
    }

    /**
     * Actually invoke the {@code afterCompletion} methods of the
     * given Spring TransactionSynchronization objects.
     *
     * @param synchronizations List of TransactionSynchronization objects
     * @param completionStatus the completion status according to the
     *                         constants in the TransactionSynchronization interface
     */
    public static void invokeAfterCompletion(List synchronizations, int completionStatus) {
        if (synchronizations != null) {
            for (TransactionSynchronization synchronization : synchronizations) {
                try {
                    synchronization.afterCompletion(completionStatus);
                } catch (Throwable tsex) {
                    logger.error("TransactionSynchronization.afterCompletion threw exception", tsex);
                }
            }
        }
    }


    /**
     * Inner class to avoid hard-coded dependency on AOP module.
     */
    private static class ScopedProxyUnwrapper {

        public static Object unwrapIfNecessary(Object resource) {
//			if (resource instanceof ScopedObject) {
//				return ((ScopedObject) resource).getTargetObject();
//			}
//			else {
            return resource;
//			}
        }
    }

}