/*
 * Copyright (c) 2016 Couchbase, Inc.
 *
 * 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.couchbase.client.core.utils;

import com.couchbase.client.core.CouchbaseException;
import com.couchbase.client.core.event.CouchbaseEvent;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;

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

/**
 * Utility methods for event handling.
 *
 * @author Michael Nitschinger
 * @since 1.2.0
 */
public class Events {

    private static final ObjectMapper JACKSON = new ObjectMapper();

    /**
     * Takes a {@link CouchbaseEvent} and returns a map with event information.
     *
     * @param source the source event.
     * @return a new map which contains name and type info in an event sub-map.
     */
    public static Map<String, Object> identityMap(CouchbaseEvent source) {
        Map<String, Object> root = new HashMap<String, Object>();
        Map<String, String> event = new HashMap<String, String>();

        event.put("name", source.getClass().getSimpleName().replaceAll("Event$", ""));
        event.put("type", source.type().toString());
        root.put("event", event);

        return root;
    }

    /**
     * Takes a {@link CouchbaseEvent} and generates a JSON string.
     *
     * @param source the source event.
     * @param pretty if pretty print should be used.
     * @return the generated json string.
     */
    public static String toJson(CouchbaseEvent source, boolean pretty) {
        try {
            if (pretty) {
                return JACKSON.writerWithDefaultPrettyPrinter().writeValueAsString(source.toMap());
            } else {
                return JACKSON.writeValueAsString(source.toMap());
            }
        } catch (JsonProcessingException e) {
            throw new CouchbaseException("Could not convert CouchbaseEvent " + source.toString() + " to JSON: ", e);
        }
    }
}