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/*
 * Copyright 2013-2014 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.cassandra.config;

import java.lang.annotation.Annotation;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;

import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider;
import org.springframework.core.type.filter.AnnotationTypeFilter;
import org.springframework.data.annotation.Persistent;
import org.springframework.data.cassandra.mapping.PrimaryKeyClass;
import org.springframework.data.cassandra.mapping.Table;
import org.springframework.util.ClassUtils;
import org.springframework.util.StringUtils;

/**
 * Scans packages for Cassandra entities.
 * 
 * @author Matthew T. Adams
 */
public class CassandraEntityClassScanner {

	public static Set> scan(String... entityBasePackages) throws ClassNotFoundException {
		return new CassandraEntityClassScanner(entityBasePackages).scanForEntityClasses();
	}

	public static Set> scan(Class... entityBasePackageClasses) throws ClassNotFoundException {
		return new CassandraEntityClassScanner(entityBasePackageClasses).scanForEntityClasses();
	}

	public static Set> scan(Collection entityBasePackages) throws ClassNotFoundException {
		return new CassandraEntityClassScanner(entityBasePackages).scanForEntityClasses();
	}

	public static Set> scan(Collection entityBasePackages, Collection> entityBasePackageClasses)
			throws ClassNotFoundException {
		return new CassandraEntityClassScanner(entityBasePackages, entityBasePackageClasses).scanForEntityClasses();
	}

	protected Set entityBasePackages = new HashSet();
	protected Set> entityBasePackageClasses = new HashSet>();
	protected ClassLoader beanClassLoader;

	public CassandraEntityClassScanner() {
	}

	public CassandraEntityClassScanner(Class... entityBasePackageClasses) {
		this(null, Arrays.asList(entityBasePackageClasses));
	}

	public CassandraEntityClassScanner(String... entityBasePackages) {
		this(Arrays.asList(entityBasePackages));
	}

	public CassandraEntityClassScanner(Collection entityBasePackages) {
		this(entityBasePackages, null);
	}

	public CassandraEntityClassScanner(Collection entityBasePackages,
			Collection> entityBasePackageClasses) {

		setEntityBasePackages(entityBasePackages);
		setEntityBasePackageClasses(entityBasePackageClasses);
	}

	public Set getEntityBasePackages() {
		return Collections.unmodifiableSet(entityBasePackages);
	}

	public void setEntityBasePackages(Collection entityBasePackages) {
		this.entityBasePackages = entityBasePackages == null ? new HashSet() : new HashSet(
				entityBasePackages);
	}

	public Set> getEntityBasePackageClasses() {
		return Collections.unmodifiableSet(entityBasePackageClasses);
	}

	public void setEntityBasePackageClasses(Collection> entityBasePackageClasses) {
		this.entityBasePackageClasses = entityBasePackageClasses == null ? new HashSet>() : new HashSet>(
				entityBasePackageClasses);
	}

	public void setBeanClassLoader(ClassLoader beanClassLoader) {
		this.beanClassLoader = beanClassLoader;
	}

	/**
	 * Scans the mapping base package for entity classes annotated with {@link Table} or {@link Persistent}.
	 * 
	 * @see #getEntityBasePackages()
	 * @return Set<Class<?>> representing the annotated entity classes found.
	 * @throws ClassNotFoundException
	 */
	public Set> scanForEntityClasses() throws ClassNotFoundException {

		Set> classes = new HashSet>();

		for (String basePackage : getEntityBasePackages()) {
			classes.addAll(scanBasePackageForEntities(basePackage));
		}

		for (Class basePackageClass : getEntityBasePackageClasses()) {
			classes.addAll(scanBasePackageForEntities(basePackageClass.getPackage().getName()));
		}

		return classes;
	}

	protected Set> scanBasePackageForEntities(String basePackage) throws ClassNotFoundException {

		HashSet> classes = new HashSet>();

		if (StringUtils.hasText(basePackage)) {
			ClassPathScanningCandidateComponentProvider componentProvider = new ClassPathScanningCandidateComponentProvider(
					false);
			for (Class annoClass : getEntityAnnotations()) {
				componentProvider.addIncludeFilter(new AnnotationTypeFilter(annoClass));
			}

			for (BeanDefinition candidate : componentProvider.findCandidateComponents(basePackage)) {
				classes.add(ClassUtils.forName(candidate.getBeanClassName(), beanClassLoader));
			}
		}

		return classes;
	}

	@SuppressWarnings("unchecked")
	public Class[] getEntityAnnotations() {
		return new Class[] { Table.class, Persistent.class, PrimaryKeyClass.class };
	}
}