/*
 * Copyright 2013 Red Hat, Inc. and/or its affiliates.
 *
 * 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.guvnor.common.services.backend.metadata.attribute;

import java.util.HashMap;
import java.util.Map;

import org.guvnor.common.services.shared.metadata.model.DiscussionRecord;

import static org.kie.soup.commons.validation.Preconditions.checkNotEmpty;

/**
 *
 */
public final class DiscussionAttributesUtil {

    private DiscussionAttributesUtil() {
    }

    public static Map<String, Object> cleanup(final Map<String, Object> _attrs) {
        final Map<String, Object> attrs = new HashMap<String, Object>(_attrs);

        for (final String key : _attrs.keySet()) {
            if (key.startsWith(DiscussionView.TIMESTAMP) || key.startsWith(DiscussionView.AUTHOR) || key.startsWith(DiscussionView.NOTE)) {
                attrs.put(key,
                          null);
            }
        }

        return attrs;
    }

    public static Map<String, Object> toMap(final DiscussionAttributes attrs,
                                            final String... attributes) {
        return new HashMap<String, Object>() {{
            for (final String attribute : attributes) {
                checkNotEmpty("attribute",
                              attribute);

                if (attribute.equals("*") || attribute.equals(DiscussionView.DISCUSS)) {
                    for (int i = 0; i < attrs.discussion().size(); i++) {
                        final DiscussionRecord record = attrs.discussion().get(i);
                        put(buildAttrName(DiscussionView.TIMESTAMP,
                                          i),
                            record.getTimestamp());
                        put(buildAttrName(DiscussionView.AUTHOR,
                                          i),
                            record.getAuthor());
                        put(buildAttrName(DiscussionView.NOTE,
                                          i),
                            record.getNote());
                    }
                }
                if (attribute.equals("*")) {
                    break;
                }
            }
        }};
    }

    private static String buildAttrName(final String title,
                                        final int i) {
        return title + "[" + i + "]";
    }
}
