/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.dubbo.samples.governance;

import org.apache.dubbo.common.utils.StringUtils;

import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.retry.ExponentialBackoffRetry;

import java.io.IOException;
import java.io.InputStream;

public class RuleUtil {
    private static String zookeeperHost = System.getProperty("zookeeper.address", "127.0.0.1");
    private static CuratorFramework client;

    public static void main(String[] args) throws Exception {
        initClient();
        generateRule();
        System.in.read();
        deleteRule();
    }

    public static void initClient() {
        client = CuratorFrameworkFactory.newClient(zookeeperHost + ":2181", 60 * 1000, 60 * 1000,
                new ExponentialBackoffRetry(1000, 3));
        client.start();
    }

    public static void generateRule() {
        try (InputStream yamlStream = RuleUtil.class.getResourceAsStream("/dubbo-routers-mesh-rule.yml")) {
            String path = "/dubbo/config/DEFAULT_GROUP/governance-mesh-rule-router-provider.MESHAPPRULE";
            if (client.checkExists().forPath(path) == null) {
                client.create().creatingParentsIfNeeded().forPath(path);
            }
            setData(path, streamToString(yamlStream));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void deleteRule() throws Exception {
        String path = "/dubbo/config/DEFAULT_GROUP/governance-mesh-rule-router-provider.MESHAPPRULE";
        if (client.checkExists().forPath(path) == null) {
            client.create().creatingParentsIfNeeded().forPath(path);
        }
        setData(path, "");
    }

    private static String streamToString(InputStream stream) throws IOException {
        byte[] bytes = new byte[stream.available()];
        stream.read(bytes);
        return new String(bytes);
    }

    private static void setData(String path, String data) throws Exception {
        client.setData().forPath(path, data.getBytes());
    }

    private static String pathToKey(String path) {
        if (StringUtils.isEmpty(path)) {
            return path;
        }
        return path.replace("/dubbo/config/", "").replaceAll("/", ".");
    }

}