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/*
 * Copyright 2014-2015 the original author or 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
 *
 *      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.springframework.data.jpa.repository.query;

import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import javax.persistence.NamedStoredProcedureQueries;
import javax.persistence.NamedStoredProcedureQuery;
import javax.persistence.StoredProcedureParameter;

import org.springframework.util.Assert;
import org.springframework.util.StringUtils;

/**
 * A factory class for {@link StoredProcedureAttributes}.
 * 
 * @author Thomas Darimont
 * @author Oliver Gierke
 * @since 1.6
 */
enum StoredProcedureAttributeSource {

	INSTANCE;

	/**
	 * Creates a new {@link StoredProcedureAttributes} from the given {@link Method} and {@link JpaEntityMetadata}.
	 * 
	 * @param method must not be {@literal null}
	 * @param entityMetadata must not be {@literal null}
	 * @return
	 */
	public StoredProcedureAttributes createFrom(Method method, JpaEntityMetadata entityMetadata) {

		Assert.notNull(method, "Method must not be null!");
		Assert.notNull(entityMetadata, "EntityMetadata must not be null!");

		Procedure procedure = method.getAnnotation(Procedure.class);
		Assert.notNull(procedure, "Method must have an @Procedure annotation!");

		NamedStoredProcedureQuery namedStoredProc = tryFindAnnotatedNamedStoredProcedureQuery(method, entityMetadata,
				procedure);

		if (namedStoredProc != null) {
			return newProcedureAttributesFrom(method, namedStoredProc, procedure);
		}

		String procedureName = deriveProcedureNameFrom(method, procedure);
		if (StringUtils.isEmpty(procedureName)) {
			throw new IllegalArgumentException("Could not determine name of procedure for @Procedure annotated method: "
					+ method);
		}

		return new StoredProcedureAttributes(procedureName, null, method.getReturnType(), false);
	}

	/**
	 * Tries to derive the procedure name from the given {@link Procedure}, falls back to the name of the given
	 * {@link Method}.
	 * 
	 * @param method
	 * @param procedure
	 * @return
	 */
	private String deriveProcedureNameFrom(Method method, Procedure procedure) {

		if (StringUtils.hasText(procedure.value())) {
			return procedure.value();
		}

		String procedureName = procedure.procedureName();
		return StringUtils.hasText(procedureName) ? procedureName : method.getName();
	}

	/**
	 * @param method
	 * @param namedStoredProc
	 * @param procedure
	 * @return
	 */
	private StoredProcedureAttributes newProcedureAttributesFrom(Method method,
			NamedStoredProcedureQuery namedStoredProc, Procedure procedure) {

		String outputParameterName = null;
		Class outputParameterType = null;

		if (!procedure.outputParameterName().isEmpty()) {

			// we give the output parameter definition from the @Procedure annotation precedence
			outputParameterName = procedure.outputParameterName();
		} else {

			// try to discover the output parameter
			List outputParameters = extractOutputParametersFrom(namedStoredProc);

			if (outputParameters.size() != 1 && !void.class.equals(method.getReturnType())) {
				throw new IllegalStateException(String.format(
						"Could not create ProcedureAttributes from %s. We currently support exactly one output parameter!", method));
			}

			if (!outputParameters.isEmpty()) {
				StoredProcedureParameter outputParameter = outputParameters.get(0);
				outputParameterName = outputParameter.name();
				outputParameterType = outputParameter.type();
			}
		}

		if (outputParameterType == null || Object.class.equals(outputParameterType)
				|| void.class.equals(outputParameterType)) {
			outputParameterType = method.getReturnType();
		}

		return new StoredProcedureAttributes(namedStoredProc.name(), outputParameterName, outputParameterType, true);
	}

	private List extractOutputParametersFrom(NamedStoredProcedureQuery namedStoredProc) {

		List outputParameters = new ArrayList();

		for (StoredProcedureParameter param : namedStoredProc.parameters()) {

			switch (param.mode()) {
				case OUT:
				case INOUT:
				case REF_CURSOR:
					outputParameters.add(param);
					break;
				case IN:
				default:
					continue;
			}
		}

		return outputParameters;
	}

	/**
	 * @param method must not be {@literal null}.
	 * @param entityMetadata must not be {@literal null}.
	 * @param procedure must not be {@literal null}.
	 * @return
	 */
	private NamedStoredProcedureQuery tryFindAnnotatedNamedStoredProcedureQuery(Method method,
			JpaEntityMetadata entityMetadata, Procedure procedure) {

		Assert.notNull(method, "Method must not be null!");
		Assert.notNull(entityMetadata, "EntityMetadata must not be null!");
		Assert.notNull(procedure, "Procedure must not be null!");

		Class entityType = entityMetadata.getJavaType();

		List queries = collectNamedStoredProcedureQueriesFrom(entityType);

		if (queries.isEmpty()) {
			return null;
		}

		String namedProcedureName = derivedNamedProcedureNameFrom(method, entityMetadata, procedure);

		for (NamedStoredProcedureQuery query : queries) {

			if (query.name().equals(namedProcedureName)) {
				return query;
			}
		}

		return null;
	}

	/**
	 * @param method
	 * @param entityMetadata
	 * @param procedure
	 * @return
	 */
	private String derivedNamedProcedureNameFrom(Method method, JpaEntityMetadata entityMetadata, Procedure procedure) {
		return StringUtils.hasText(procedure.name()) ? procedure.name() : entityMetadata.getEntityName() + "."
				+ method.getName();
	}

	/**
	 * @param entityType
	 * @return
	 */
	private List collectNamedStoredProcedureQueriesFrom(Class entityType) {

		List queries = new ArrayList();

		NamedStoredProcedureQueries namedQueriesAnnotation = entityType.getAnnotation(NamedStoredProcedureQueries.class);
		if (namedQueriesAnnotation != null) {
			queries.addAll(Arrays.asList(namedQueriesAnnotation.value()));
		}

		NamedStoredProcedureQuery namedQueryAnnotation = entityType.getAnnotation(NamedStoredProcedureQuery.class);
		if (namedQueryAnnotation != null) {
			queries.add(namedQueryAnnotation);
		}

		return queries;
	}
}