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/*
 * Copyright 2004-2022 Asterisk-Java contributors
 *
 * 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.asteriskjava.manager.internal;

import org.asteriskjava.manager.response.CommandResponse;
import org.asteriskjava.manager.response.ManagerError;
import org.asteriskjava.manager.response.ManagerResponse;
import org.asteriskjava.manager.util.EventAttributesHelper;
import org.asteriskjava.util.Log;
import org.asteriskjava.util.LogFactory;

import java.util.*;

/**
 * Default implementation of the ResponseBuilder interface.
 *
 * @author srt
 * @version $Id$
 * @see org.asteriskjava.manager.response.ManagerResponse
 */
class ResponseBuilderImpl implements ResponseBuilder {
    private static final Log logger = LogFactory.getLog(ResponseBuilderImpl.class);

    private static final Set ignoredAttributes = new HashSet<>(Arrays.asList(
        "attributes", "proxyresponse", ManagerReader.COMMAND_RESULT_RESPONSE_KEY));

    private static final String RESPONSE_KEY = "response";
    private static final String PROXY_RESPONSE_KEY = "proxyresponse";
    private static final String RESPONSE_TYPE_ERROR = "error";
    private static final String OUTPUT_RESPONSE_KEY = "output"; //Asterisk 14.3.0

    @SuppressWarnings("unchecked")
    public ManagerResponse buildResponse(Class responseClass, Map attributes) {
        final ManagerResponse response;
        final String responseType = (String) attributes.get(RESPONSE_KEY);

        if (RESPONSE_TYPE_ERROR.equalsIgnoreCase(responseType)) {
            response = new ManagerError();
        } else if (responseClass == null) {
            response = new ManagerResponse();
        } else {
            try {
                response = responseClass.getDeclaredConstructor().newInstance();
            } catch (Exception ex) {
                logger.error("Unable to create new instance of " + responseClass.getName(), ex);
                return null;
            }
        }

        EventAttributesHelper.setAttributes(response, attributes, ignoredAttributes);

        if (response instanceof CommandResponse) {
            final CommandResponse commandResponse = (CommandResponse) response;
            final List result = new ArrayList<>();
            //For Asterisk 14
            if (attributes.get(OUTPUT_RESPONSE_KEY) != null) {
                if (attributes.get(OUTPUT_RESPONSE_KEY) instanceof List) {
                    for (String tmp : (List) attributes.get(OUTPUT_RESPONSE_KEY)) {
                        if (tmp != null && tmp.length() != 0) {
                            result.add(tmp.trim());
                        }
                    }
                } else {
                    result.add((String) attributes.get(OUTPUT_RESPONSE_KEY));
                }

            } else {
                for (String resultLine : ((String) attributes.get(ManagerReader.COMMAND_RESULT_RESPONSE_KEY)).split("\n")) {
                    // on error there is a leading space
                    if (!resultLine.equals("--END COMMAND--") && !resultLine.equals(" --END COMMAND--")) {
                        result.add(resultLine);
                    }
                }
            }
            commandResponse.setResult(result);
        }

        if (response.getResponse() != null && attributes.get(PROXY_RESPONSE_KEY) != null) {
            response.setResponse((String) attributes.get(PROXY_RESPONSE_KEY));
        }

        // make the map of all attributes available to the response
        // but clone it as it is reused by the ManagerReader
        response.setAttributes(new HashMap<>(attributes));

        return response;
    }
}