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package com.slyak.spring.jpa;

import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
import org.springframework.aop.AfterAdvice;
import org.springframework.aop.framework.ProxyFactory;
import org.springframework.core.annotation.AnnotationUtils;
import org.springframework.core.annotation.OrderUtils;
import org.springframework.data.jpa.provider.PersistenceProvider;
import org.springframework.data.jpa.repository.support.JpaRepositoryFactory;
import org.springframework.data.repository.core.RepositoryInformation;
import org.springframework.data.repository.core.support.RepositoryProxyPostProcessor;
import org.springframework.data.repository.query.EvaluationContextProvider;
import org.springframework.data.repository.query.QueryLookupStrategy;

import javax.persistence.Entity;
import javax.persistence.EntityManager;
import java.lang.reflect.ParameterizedType;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;

/**
 * .
 * 
 *
 * @author stormning
 * @version V1.0, 2015/8/9.
 */
public class GenericJpaRepositoryFactory extends JpaRepositoryFactory {
    private final EntityManager entityManager;
    private final PersistenceProvider extractor;
    private Map, List> assemblers = new ConcurrentHashMap, List>();

    /**
     * Creates a new {@link JpaRepositoryFactory}.
     *
     * @param entityManager must not be {@literal null}
     */
    public GenericJpaRepositoryFactory(EntityManager entityManager) {
        super(entityManager);
        this.entityManager = entityManager;
        this.extractor = PersistenceProvider.fromEntityManager(entityManager);

        final AssmblerInterceptor assmblerInterceptor = new AssmblerInterceptor();
        addRepositoryProxyPostProcessor(new RepositoryProxyPostProcessor() {
            @Override
            public void postProcess(ProxyFactory factory, RepositoryInformation repositoryInformation) {
                factory.addAdvice(assmblerInterceptor);
            }
        });
    }

    @Override
    protected QueryLookupStrategy getQueryLookupStrategy(QueryLookupStrategy.Key key, EvaluationContextProvider evaluationContextProvider) {
        return TemplateQueryLookupStrategy.create(entityManager, key, extractor, evaluationContextProvider);
    }

    private List getEntityAssemblers(Class clazz) {
        if (assemblers.isEmpty()) {
            Collection abs = ContextHolder.getBeansOfType(EntityAssembler.class);
            if (abs.isEmpty()) {
                return Collections.emptyList();
            } else {
                for (EntityAssembler ab : abs) {
                    Class p0 = getGenericParameter0(ab.getClass());
                    List ass = this.assemblers.get(p0);
                    if (ass == null) {
                        ass = new ArrayList();
                        assemblers.put(p0, ass);
                    }
                    ass.add(ab);
                }
                for (List ess : assemblers.values()) {
                    Collections.sort(ess, new Comparator() {
                        @Override
                        public int compare(EntityAssembler o1, EntityAssembler o2) {
                            return OrderUtils.getOrder(o2.getClass()) - OrderUtils.getOrder(o1.getClass());
                        }
                    });
                }
            }
        }
        return assemblers.get(clazz);
    }

    private void massemble(Iterable iterable) {
        if (!iterable.iterator().hasNext()) {
            return;
        }

        Object object = iterable.iterator().next();
        if (isEntityObject(object)) {
            List entityAssemblers = getEntityAssemblers(object.getClass());
            if (entityAssemblers.isEmpty()) {
                for (EntityAssembler assembler : entityAssemblers) {
                    assembler.massemble(iterable);
                }
            }
        }
    }

    private boolean isEntityObject(Object object) {
        return object != null && AnnotationUtils.findAnnotation(object.getClass(), Entity.class) != null;
    }

    private Class getGenericParameter0(Class clzz) {
        return (Class) ((ParameterizedType) clzz.getGenericSuperclass()).getActualTypeArguments()[0];
    }

    public class AssmblerInterceptor implements MethodInterceptor, AfterAdvice {

        @Override
        public Object invoke(MethodInvocation invocation) throws Throwable {
            Object proceed = invocation.proceed();
            if (!"save".equals(invocation.getMethod().getName())) {
                if (proceed != null) {
                    //EntityAssembler
                    if (proceed instanceof Iterable) {
                        massemble((Iterable) proceed);
                    } else if (proceed instanceof Map) {
                        massemble(((Map) proceed).values());
                    } else if (isEntityObject(proceed)) {
                        List entityAssemblers = getEntityAssemblers(proceed.getClass());
                        if (!entityAssemblers.isEmpty()) {
                            for (EntityAssembler assembler : entityAssemblers) {
                                assembler.assemble(proceed);
                            }
                        }
                    }
                }
            }
            return proceed;
        }
    }
}