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/*
 * Copyright (C) 2018  Sun.Hao
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */

/*
 * Copyright 2012-2014 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 lodsve.mongodb.repository;

import org.springframework.core.annotation.AnnotationAttributes;
import org.springframework.core.env.Environment;
import org.springframework.core.io.ResourceLoader;
import org.springframework.core.type.AnnotationMetadata;
import org.springframework.data.repository.config.AnnotationRepositoryConfigurationSource;
import org.springframework.util.ClassUtils;

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

/**
 * Lodsve custom AnnotationRepositoryConfigurationSource.
 *
 * @author sunhao(sunhao.java @ gmail.com)
 * @version 1.0 2017-12-11-0011 14:24
 */
public class LodsveAnnotationRepositoryConfigurationSource extends AnnotationRepositoryConfigurationSource {
    private static final String BASE_PACKAGES = "basePackages";
    private final AnnotationAttributes attributes;
    private final AnnotationMetadata configMetadata;

    /**
     * Creates a new {@link org.springframework.data.repository.config.AnnotationRepositoryConfigurationSource} from the given {@link org.springframework.core.type.AnnotationMetadata} and
     * annotation.
     *
     * @param metadata
     * @param annotation     must not be {@literal null}.
     * @param resourceLoader must not be {@literal null}.
     * @param environment
     */
    public LodsveAnnotationRepositoryConfigurationSource(AnnotationMetadata metadata, Class annotation, ResourceLoader resourceLoader, Environment environment) {
        super(metadata, annotation, resourceLoader, environment);
        this.attributes = new AnnotationAttributes(metadata.getAnnotationAttributes(annotation.getName()));
        this.configMetadata = metadata;
    }

    @Override
    public Iterable getBasePackages() {
        String[] basePackages = attributes.getStringArray(BASE_PACKAGES);

        // Default configuration - return package of annotated class
        if (basePackages.length == 0) {
            String className = configMetadata.getClassName();
            return Collections.singleton(ClassUtils.getPackageName(className));
        }

        return new HashSet<>(Arrays.asList(basePackages));
    }
}