/**
 * Copyright (C) FuseSource, Inc.
 * http://fusesource.com
 *
 * 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.fusesource.fabric.service.jclouds;

import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.HashSet;
import java.util.Properties;
import java.util.Set;
import java.util.concurrent.CountDownLatch;
import com.google.common.base.Strings;
import org.apache.commons.io.IOUtils;
import org.fusesource.fabric.api.CreateJCloudsContainerMetadata;
import org.fusesource.fabric.api.CreateJCloudsContainerOptions;
import org.fusesource.fabric.internal.ContainerProviderUtils;
import org.fusesource.fabric.service.jclouds.firewall.FirewallManager;
import org.fusesource.fabric.service.jclouds.firewall.FirewallManagerFactory;
import org.fusesource.fabric.service.jclouds.firewall.FirewallNotSupportedOnProviderException;
import org.fusesource.fabric.service.jclouds.firewall.Rule;
import org.fusesource.fabric.zookeeper.ZkDefs;
import org.jclouds.compute.ComputeService;
import org.jclouds.compute.domain.ExecResponse;
import org.jclouds.compute.domain.NodeMetadata;
import org.jclouds.compute.options.TemplateOptions;
import org.jclouds.domain.LoginCredentials;
import org.jclouds.rest.AuthorizationException;
import org.jclouds.ssh.SshException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


import static org.fusesource.fabric.internal.ContainerProviderUtils.buildInstallAndStartScript;

public class CloudContainerInstallationTask implements Runnable {

    private static final Logger LOGGER = LoggerFactory.getLogger(JcloudsContainerProvider.class);

    private final String containerName;
    private final NodeMetadata nodeMetadata;
    private final CreateJCloudsContainerOptions options;

    private final ComputeService computeService;
    private final FirewallManagerFactory firewallManagerFactory;
    private final TemplateOptions templateOptions;

    private final Set<CreateJCloudsContainerMetadata> result;
    private final CountDownLatch latch;

    public CloudContainerInstallationTask(String containerName, NodeMetadata nodeMetadata, CreateJCloudsContainerOptions options, ComputeService computeService, FirewallManagerFactory firewallManagerFactory, TemplateOptions templateOptions, Set<CreateJCloudsContainerMetadata> result, CountDownLatch latch) {
        this.containerName = containerName;
        this.nodeMetadata = nodeMetadata;
        this.options = options;
        this.computeService = computeService;
        this.firewallManagerFactory = firewallManagerFactory;
        this.templateOptions = templateOptions;
        this.result = result;
        this.latch = latch;
    }

    @Override
    public void run() {
        try {
            LoginCredentials credentials = nodeMetadata.getCredentials();
            //For some cloud providers return do not allow shell access to root, so the user needs to be overrided.
            if (!Strings.isNullOrEmpty(options.getUser()) && credentials != null) {
                credentials = credentials.toBuilder().user(options.getUser()).build();
            } else {
                credentials = nodeMetadata.getCredentials();
            }
            String id = nodeMetadata.getId();
            Set<String> publicAddresses = nodeMetadata.getPublicAddresses();

            //Make a copy of the addresses, because we don't want to return back a guice implementation of Set.
            Set<String> copyOfPublicAddresses = new HashSet<String>();
            for (String publicAddress : publicAddresses) {
                copyOfPublicAddresses.add(publicAddress);
            }

            CreateJCloudsContainerMetadata jCloudsContainerMetadata = new CreateJCloudsContainerMetadata();
            jCloudsContainerMetadata.setCreateOptions(options);
            jCloudsContainerMetadata.setNodeId(nodeMetadata.getId());
            jCloudsContainerMetadata.setContainerName(containerName);
            jCloudsContainerMetadata.setPublicAddresses(copyOfPublicAddresses);
            jCloudsContainerMetadata.setHostname(nodeMetadata.getHostname());
            if (credentials != null) {
                jCloudsContainerMetadata.setIdentity(credentials.identity);
                jCloudsContainerMetadata.setCredential(credentials.credential);
            }

            String publicAddress = "";
            Properties addresses = new Properties();
            if (publicAddresses != null && !publicAddresses.isEmpty()) {
                publicAddress = publicAddresses.toArray(new String[publicAddresses.size()])[0];
                addresses.put(ZkDefs.PUBLIC_IP, publicAddress);
            }

            options.getSystemProperties().put(ContainerProviderUtils.ADDRESSES_PROPERTY_KEY, addresses);
            options.getMetadataMap().put(containerName, jCloudsContainerMetadata);

            //Setup firwall for node
            try {
                FirewallManager firewallManager = firewallManagerFactory.getFirewallManager(computeService);
                if (firewallManager.isSupported()) {
                    options.getCreationStateListener().onStateChange("Configuring firewall.");
                    String source = getOriginatingIp();

                    Rule httpRule = Rule.create().source("0.0.0.0/0").destination(nodeMetadata).port(8181);
                    firewallManager.addRules(httpRule);

                    if (source != null) {
                        Rule jmxRule = Rule.create().source(source).destination(nodeMetadata).ports(44444, 1099);
                        Rule sshRule = Rule.create().source(source).destination(nodeMetadata).port(8101);
                        Rule zookeeperRule = Rule.create().source(source).destination(nodeMetadata).port(2181);
                        firewallManager.addRules(jmxRule, sshRule, zookeeperRule);
                    }
                    //We do add the target node public address to the firewall rules, as a way to make things easier in cases
                    //where firewall configuration is shared among nodes of the same groups, e.g. EC2.
                    if (!Strings.isNullOrEmpty(publicAddress)) {
                        Rule zookeeperFromTargetRule = Rule.create().source(publicAddress + "/32").destination(nodeMetadata).port(2181);
                        firewallManager.addRule(zookeeperFromTargetRule);
                    }
                } else {
                    options.getCreationStateListener().onStateChange(String.format("Skipping firewall configuration. Not supported for provider %s", options.getProviderName()));
                }
            } catch (FirewallNotSupportedOnProviderException e) {
                LOGGER.warn("Firewall manager not supported. Firewall will have to be manually configured.");
            } catch (IOException e) {
                LOGGER.warn("Could not lookup originating ip. Firewall will have to be manually configured.", e);
            } catch (Throwable t) {
                LOGGER.warn("Failed to setup firewall", t);
            }


            try {
                String script = buildInstallAndStartScript(options.name(containerName));
                options.getCreationStateListener().onStateChange(String.format("Installing fabric agent on container %s. It may take a while...", containerName));
                ExecResponse response = null;
                try {
                    if (credentials != null) {
                        response = computeService.runScriptOnNode(id, script, templateOptions.overrideLoginCredentials(credentials).runAsRoot(false));
                    } else {
                        response = computeService.runScriptOnNode(id, script, templateOptions);
                    }
                } catch (AuthorizationException ex) {
                    throw new Exception("Failed to connect to the container via ssh.");
                } catch (SshException ex) {
                    throw new Exception("Failed to connect to the container via ssh.");
                }

                if (response != null && response.getOutput() != null) {
                    if (response.getOutput().contains(ContainerProviderUtils.FAILURE_PREFIX)) {
                        jCloudsContainerMetadata.setFailure(new Exception(ContainerProviderUtils.parseScriptFailure(response.getOutput())));
                    }
                    String overridenResolverValue = ContainerProviderUtils.parseResolverOverride(response.getOutput());
                    if (overridenResolverValue != null) {
                        options.setResolver(overridenResolverValue);
                        options.getCreationStateListener().onStateChange("Overriding resolver to " + overridenResolverValue + ".");
                    }
                } else {
                    jCloudsContainerMetadata.setFailure(new Exception("No response received for fabric install script."));
                }
            } catch (Throwable t) {
                jCloudsContainerMetadata.setFailure(t);
            }
            //Cleanup addresses.
            options.getSystemProperties().clear();
            result.add(jCloudsContainerMetadata);
        } finally {
            latch.countDown();
        }
    }

    /**
     * @return the IP address of the client on which this code is running.
     * @throws java.io.IOException
     */
    private String getOriginatingIp() throws IOException {
        String ip = null;
        try {
            URL url = new URL("http://checkip.amazonaws.com/");
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.connect();
            ip = IOUtils.toString(connection.getInputStream()).trim() + "/32";
        } catch (Throwable t) {
            LOGGER.warn("Failed to lookup public ip of current container.");
        }
        return ip;
    }
}
