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/**
 * Copyright (C) 2009-2015 Dell, Inc.
 * See annotations for authorship information
 *
 * ====================================================================
 * 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.dasein.cloud.aws.platform;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Locale;

import javax.annotation.CheckForNull;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.servlet.http.HttpServletResponse;

import org.apache.log4j.Logger;
import org.dasein.cloud.CloudException;
import org.dasein.cloud.InternalException;
import org.dasein.cloud.ProviderContext;
import org.dasein.cloud.ResourceStatus;
import org.dasein.cloud.aws.AWSCloud;
import org.dasein.cloud.aws.platform.CloudFrontMethod.CloudFrontResponse;
import org.dasein.cloud.identity.ServiceAction;
import org.dasein.cloud.platform.CDNCapabilities;
import org.dasein.cloud.platform.CDNSupport;
import org.dasein.cloud.platform.Distribution;
import org.dasein.cloud.storage.Blob;
import org.dasein.cloud.util.APITrace;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

public class CloudFront implements CDNSupport {
	static private final Logger logger = AWSCloud.getLogger(CloudFront.class);
    private volatile transient CloudFrontCapabilities capabilities;
	private AWSCloud provider = null;
	
	CloudFront(AWSCloud provider) {
		this.provider = provider;
	}
	
	@Override
	public @Nonnull String create(@Nonnull String bucket, @Nonnull String name, boolean active, @CheckForNull String ... cnames) throws InternalException, CloudException {
        APITrace.begin(provider, "CDN.create");
        try {
            ProviderContext ctx = provider.getContext();

            if( ctx == null ) {
                throw new CloudException("No context was established for this request");
            }
            CloudFrontResponse response;
            CloudFrontMethod method;
            NodeList blocks;

            provider.getStorageServices().getBlobStoreSupport().makePublic(bucket);
            for( Blob file : provider.getStorageServices().getBlobStoreSupport().list(bucket) ) {
                if( !file.isContainer() ) {
                    provider.getStorageServices().getBlobStoreSupport().makePublic(file.getBucketName(), file.getObjectName());
                }
            }
            method = new CloudFrontMethod(provider, CloudFrontAction.CREATE_DISTRIBUTION, null, toConfigXml(bucket, name, null, null, null, active, cnames));
            try {
                response = method.invoke();
            }
            catch( CloudFrontException e ) {
                logger.error(e.getSummary());
                throw new CloudException(e);
            }
            blocks = response.document.getElementsByTagName("Distribution");
            for( int i=0; i headers = new HashMap();
                CloudFrontMethod method;
                String etag;

                etag = (String)getDistributionWithEtag(distributionId)[1];
                headers.put("If-Match", etag);
                method = new CloudFrontMethod(provider, CloudFrontAction.DELETE_DISTRIBUTION, headers, null);
                try {
                    method.invoke(distributionId);
                    return;
                }
                catch( CloudFrontException e ) {
                    String code = e.getCode();

                    if( code != null && code.equals("DistributionNotDisabled") ) {
                        try { Thread.sleep(10000L); }
                        catch( InterruptedException interrupt ) { /* ignore */ }
                    }
                    else {
                        logger.error(e.getSummary());
                        throw new CloudException(e);
                    }
                }
            }
        }
        finally {
            APITrace.end();
        }
	}

    @Override
    public @Nonnull CDNCapabilities getCapabilities() throws InternalException, CloudException {
        if( capabilities == null ) {
            capabilities = new CloudFrontCapabilities(provider);
        }
        return capabilities;
    }

    @Override
	public @Nullable Distribution getDistribution(@Nonnull String distributionId) throws InternalException, CloudException {
        APITrace.begin(provider, "CDN.getDistribution");
        try {
            Object[] parts = getDistributionWithEtag(distributionId);
        
            if( parts.length < 1 ) {
                return null;
            }
            return (Distribution)parts[0];
        }
        finally {
            APITrace.end();
        }
	}
	
	private @Nonnull Object[] getDistributionWithEtag(@Nonnull String distributionId) throws InternalException, CloudException {
        APITrace.begin(provider, "CDN.getDistributionWithEtag");
        try {
            ProviderContext ctx = provider.getContext();

            if( ctx == null ) {
                throw new CloudException("No context was established for this request");
            }
            CloudFrontMethod method = new CloudFrontMethod(provider, CloudFrontAction.GET_DISTRIBUTION, null, null);
            CloudFrontResponse response;
            NodeList blocks;

            try {
                response = method.invoke(distributionId);
            }
            catch( CloudFrontException e ) {
                String code = e.getCode();

                if( code != null && code.equals("NoSuchDistribution") ) {
                    return new Object[] { null, null, null };
                }
                logger.error(e.getSummary());
                throw new CloudException(e);
            }
            blocks = response.document.getElementsByTagName("Distribution");
            for( int i=0; i 0 ) {
                        callerReference = blocks.item(0).getFirstChild().getNodeValue();
                    }
                    return new Object[] { dist, response.etag, callerReference };
                }
            }
            return new Object[0];
        }
        finally {
            APITrace.end();
        }
	}

	@Override
    @Deprecated
	public @Nonnull String getProviderTermForDistribution(@Nonnull Locale locale) {
        try {
            return getCapabilities().getProviderTermForDistribution(locale);
        } catch( InternalException e ) {
        } catch( CloudException e ) {
        }
        return "distribution"; // legacy
    }

	@Override
	public boolean isSubscribed() throws InternalException, CloudException {
        APITrace.begin(provider, "CDN.isSubscribed");
        try {
            CloudFrontMethod method = new CloudFrontMethod(provider, CloudFrontAction.LIST_DISTRIBUTIONS, null, null);

            try {
                method.invoke();
                return true;
            }
            catch( CloudFrontException e ) {
                if( e.getStatus() == HttpServletResponse.SC_UNAUTHORIZED || e.getStatus() == HttpServletResponse.SC_FORBIDDEN ) {
                    return false;
                }
                String code = e.getCode();

                if( code != null && (code.equals("SubscriptionCheckFailed") || code.equals("AuthFailure") || code.equals("SignatureDoesNotMatch") || code.equals("InvalidClientTokenId") || code.equals("OptInRequired")) ) {
                    return false;
                }
                logger.warn(e.getSummary());
                if( logger.isDebugEnabled() ) {
                    e.printStackTrace();
                }
                throw new CloudException(e);
            }
        }
        finally {
            APITrace.end();
        }
	}
	
	@Override
	public @Nonnull Collection list() throws InternalException, CloudException {
        APITrace.begin(provider, "CDN.list");
        try {
            CloudFrontMethod method = new CloudFrontMethod(provider, CloudFrontAction.LIST_DISTRIBUTIONS, null, null);
            ArrayList list = new ArrayList();
            CloudFrontResponse response;
            NodeList blocks;

            try {
                response = method.invoke();
            }
            catch( CloudFrontException e ) {
                logger.error(e.getSummary());
                throw new CloudException(e);
            }
            blocks = response.document.getElementsByTagName("DistributionSummary");
            for( int i=0; i listDistributionStatus() throws InternalException, CloudException {
        APITrace.begin(provider, "CDN.listDistributionStatus");
        try {
            CloudFrontMethod method = new CloudFrontMethod(provider, CloudFrontAction.LIST_DISTRIBUTIONS, null, null);
            ArrayList list = new ArrayList();
            CloudFrontResponse response;
            NodeList blocks;

            try {
                response = method.invoke();
            }
            catch( CloudFrontException e ) {
                logger.error(e.getSummary());
                throw new CloudException(e);
            }
            blocks = response.document.getElementsByTagName("DistributionSummary");
            for( int i=0; i headers = new HashMap();
            Object[] distData = getDistributionWithEtag(distributionId);
            Distribution distribution = (Distribution)distData[0];
            String location = (distribution == null ? null : distribution.getLocation());
            String[] parts = (location == null ? new String[0] : location.split("\\."));
            CloudFrontResponse response;
            String bucket = parts[0];
            CloudFrontMethod method;
            NodeList blocks;

            headers.put("If-Match", (String)distData[1]);
            String logDirectory = (distribution == null ? null : distribution.getLogDirectory());
            String logName = (distribution == null ? null : distribution.getLogName());

            method = new CloudFrontMethod(provider, CloudFrontAction.UPDATE_DISTRIBUTION, headers, toConfigXml(bucket, name, (String)distData[2], logDirectory, logName, active, cnames));
            try {
                response = method.invoke(distributionId, "config");
            }
            catch( CloudFrontException e ) {
                logger.error(e.getSummary());
                throw new CloudException(e);
            }
            blocks = response.document.getElementsByTagName("Distribution");
            for( int i=0; i\r\n");
		xml.append("\r\n");
		xml.append("");
		xml.append(toXml(bucket));
		xml.append(".s3.amazonaws.com");
		xml.append("\r\n");
		xml.append("");
		xml.append(callerReference == null ? String.valueOf(System.currentTimeMillis()) : callerReference);
		xml.append("\r\n");
		if( cnames != null ) {
			for( String cname : cnames ) {
				xml.append("");
				xml.append(toXml(cname));
				xml.append("\r\n");
			}
		}
		xml.append("");
		xml.append(toXml(name));
		xml.append("\r\n");
		xml.append("");
		xml.append(String.valueOf(active));
		xml.append("");
		if( logDirectory != null && logName != null ) {
		    xml.append("\r\n");
		    xml.append("");
		    xml.append(logDirectory);
		    xml.append("\r\n");
		    xml.append("");
		    xml.append(logName);
		    xml.append("\r\n");
		    xml.append("\r\n");
		}
		xml.append("\r\n");
		return xml.toString();
	}
	
	private @Nullable Distribution toDistributionFromInfo(@Nonnull ProviderContext ctx, @Nullable Node node) {
        if( node == null ) {
            return null;
        }
		ArrayList cnames = new ArrayList();
		Distribution distribution = new Distribution();
		NodeList attrs = node.getChildNodes();
		
		distribution.setProviderOwnerId(ctx.getAccountNumber());
		for( int i=0; i cnames = new ArrayList();
		Distribution distribution = new Distribution();
		NodeList attrs = node.getChildNodes();

        //noinspection ConstantConditions
        distribution.setProviderOwnerId(provider.getContext().getAccountNumber());
		for( int i=0; i", ">").replaceAll("\"", """).replaceAll("'", "'");
	}
}




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