/*
 * Copyright 2012-2016 MarkLogic Corporation
 *
 * 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 com.marklogic.client.io;

import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.Map;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.marklogic.client.MarkLogicBindingException;
import com.marklogic.client.MarkLogicIOException;
import com.marklogic.client.io.marker.OperationNotSupported;
import com.marklogic.client.io.marker.QueryOptionsListReadHandle;
import com.marklogic.client.query.QueryOptionsListBuilder;
import com.marklogic.client.query.QueryOptionsListResults;

/**
 * A QueryOptionsListHandle is used to access the list of named query options that exist on the server.
 */
public class QueryOptionsListHandle
	extends BaseHandle<InputStream, OperationNotSupported>
	implements QueryOptionsListReadHandle, QueryOptionsListResults
{
    static final private Logger logger = LoggerFactory.getLogger(QueryOptionsListHandle.class);

    private QueryOptionsListBuilder.OptionsList optionsHolder;
    private Marshaller marshaller;
    private Unmarshaller unmarshaller;

    /**
     * The constructor.
     */
    public QueryOptionsListHandle() {
    	super();
    	super.setFormat(Format.XML);
        try {
            JAXBContext jc = JaxbContextLoader.CACHED_CONTEXT;
            marshaller = jc.createMarshaller();
            marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
            unmarshaller = jc.createUnmarshaller();
        } catch (JAXBException e) {
            throw new MarkLogicBindingException(e);
        } catch (NoClassDefFoundError ncdfe) {
            throw new MarkLogicBindingException(new JAXBException("JAXB context initialization failed"));
        }
    }

    /**
     * Sets the format associated with this handle.
     *
     * This handle only supports XML.
     *
     * @param format The format, which must be Format.XML or an exception will be raised.
     */
    @Override
    public void setFormat(Format format) {
        if (format != Format.XML)
        	throw new IllegalArgumentException("QueryOptionsListHandle supports the XML format only");
    }

    /**
     * Fluent setter for the format associated with this handle.
     *
     * This handle only supports XML.
     *
     * @param format The format, which must be Format.XML or an exception will be raised.
     * @return The QueryOptionsListHandle instance on which this method was called.
     */
    public QueryOptionsListHandle withFormat(Format format) {
        setFormat(format);
        return this;
    }

    @Override
    protected Class<InputStream> receiveAs() {
        return InputStream.class;
    }

    @Override
    protected void receiveContent(InputStream content) {
        try {
            optionsHolder = (QueryOptionsListBuilder.OptionsList) unmarshaller.unmarshal(
            		new InputStreamReader(content, "UTF-8")
            		);
		} catch (UnsupportedEncodingException e) {
			logger.error("Failed to unmarshall query options list",e);
			throw new MarkLogicIOException(e);
        } catch (JAXBException e) {
			logger.error("Failed to unmarshall query options list",e);
			throw new MarkLogicIOException(e);
        }
    }

    /**
     * Returns a Map of the named query options from the server.
     *
     * The keys are the names of the query options, the values are the corresponding URIs on the server.
     *
     * @return The map of names to URIs.
     */
    @Override
    public Map<String, String> getValuesMap() {
    	if (optionsHolder == null ) return null;
    	else return optionsHolder.getOptionsMap();
    }

    /**
     * Initialization-on-demand holder for {@link QueryOptionsListHandle}'s JAXB context.
     */
    private static class JaxbContextLoader {

        private static final JAXBContext CACHED_CONTEXT;

        static {
            try {
                CACHED_CONTEXT = JAXBContext.newInstance(QueryOptionsListBuilder.OptionsList.class);
            } catch (JAXBException e) {
                throw new MarkLogicBindingException(e);
            }
        }
    }
}

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revert a change to a public interface we don't yet want changed