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/*
 * Copyright 2013-2018 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
 *
 *      https://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 com.alibaba.cloud.nacos.config.server.environment;

import java.io.IOException;
import java.io.StringReader;
import java.util.Properties;

import com.alibaba.nacos.config.server.model.ConfigInfo;
import com.alibaba.nacos.config.server.service.PersistService;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.config.environment.Environment;
import org.springframework.cloud.config.environment.PropertySource;
import org.springframework.cloud.config.server.environment.EnvironmentRepository;
import org.springframework.util.StringUtils;

import static com.alibaba.nacos.config.server.constant.Constants.DEFAULT_GROUP;

/**
 * Nacos {@link EnvironmentRepository}.
 *
 * @author Mercy
 * @since 0.2.0
 */
public class NacosEnvironmentRepository implements EnvironmentRepository {

	@Autowired
	private PersistService persistService;

	@Override
	public Environment findOne(String application, String profile, String label) {

		String dataId = application + "-" + profile + ".properties";

		ConfigInfo configInfo = persistService.findConfigInfo(dataId, DEFAULT_GROUP,
				label);

		return createEnvironment(configInfo, application, profile);
	}

	private Environment createEnvironment(ConfigInfo configInfo, String application,
			String profile) {

		Environment environment = new Environment(application, profile);

		Properties properties = createProperties(configInfo);

		String propertySourceName = String
				.format("Nacos[application : %s , profile : %s]", application, profile);

		PropertySource propertySource = new PropertySource(propertySourceName,
				properties);

		environment.add(propertySource);

		return environment;
	}

	private Properties createProperties(ConfigInfo configInfo) {
		Properties properties = new Properties();
		String content = configInfo == null ? null : configInfo.getContent();
		if (StringUtils.hasText(content)) {
			try {
				properties.load(new StringReader(content));
			}
			catch (IOException e) {
				throw new IllegalStateException("The format of content is a properties");
			}
		}
		return properties;
	}

	private static String[] of(String... values) {
		return values;
	}

}