/*
 * Copyright (C) 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
 *
 *      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.cloud.alicloud.acm.bootstrap;

import com.alibaba.edas.acm.ConfigService;
import com.alibaba.edas.acm.exception.ConfigException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.config.YamlPropertiesFactoryBean;
import org.springframework.core.io.ByteArrayResource;
import org.springframework.util.StringUtils;

import java.io.StringReader;
import java.util.Date;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;

/**
 * @author juven.xuxb
 * @author xiaolongzuo
 */
class AcmPropertySourceBuilder {

	private Logger log = LoggerFactory.getLogger(AcmPropertySourceBuilder.class);

	/**
	 * 传入 ACM 的 DataId 和 groupID，获取到解析后的 AcmProperty 对象
	 *
	 * @param dataId
	 * @param diamondGroup
	 * @param groupLevel
	 * @return
	 */
	AcmPropertySource build(String dataId, String diamondGroup, boolean groupLevel) {
		Properties properties = loadDiamondData(dataId, diamondGroup);
		if (properties == null) {
			return null;
		}
		return new AcmPropertySource(dataId, toMap(properties), new Date(), groupLevel);
	}

	private Properties loadDiamondData(String dataId, String diamondGroup) {
		try {
			String data = ConfigService.getConfig(dataId, diamondGroup, 3000L);
			if (StringUtils.isEmpty(data)) {
				return null;
			}
			if (dataId.endsWith(".properties")) {
				Properties properties = new Properties();
				log.info(String.format("Loading acm data, dataId: '%s', group: '%s'",
						dataId, diamondGroup));
				properties.load(new StringReader(data));
				return properties;
			}
			else if (dataId.endsWith(".yaml") || dataId.endsWith(".yml")) {
				YamlPropertiesFactoryBean yamlFactory = new YamlPropertiesFactoryBean();
				yamlFactory.setResources(new ByteArrayResource(data.getBytes()));
				return yamlFactory.getObject();
			}
		}
		catch (Exception e) {
			if (e instanceof ConfigException) {
				log.error("DIAMOND-100500:" + dataId + ", " + e.toString(), e);
			}
			else {
				log.error("DIAMOND-100500:" + dataId, e);
			}
		}
		return null;
	}

	@SuppressWarnings("unchecked")
	private Map<String, Object> toMap(Properties properties) {
		Map<String, Object> result = new HashMap<>();
		Enumeration<String> keys = (Enumeration<String>) properties.propertyNames();
		while (keys.hasMoreElements()) {
			String key = keys.nextElement();
			Object value = properties.getProperty(key);
			if (value != null) {
				result.put(key, ((String) value).trim());
			}
			else {
				result.put(key, null);
			}
		}
		return result;
	}
}
