/*
 * Copyright 2011 Proofpoint, 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.proofpoint.event.monitor;

import com.google.common.collect.ImmutableSet;
import com.proofpoint.json.JsonCodec;

import javax.inject.Inject;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.concurrent.ScheduledExecutorService;

public class MonitorLoader
{
    private final ScheduledExecutorService executor;
    private final Alerter alerter;
    private final JsonCodec<Map<String, MonitorJson>> codec;

    @Inject
    public MonitorLoader(@MonitorExecutorService ScheduledExecutorService executor, Alerter alerter, JsonCodec<Map<String, MonitorJson>> codec)
    {
        this.executor = executor;
        this.alerter = alerter;
        this.codec = codec;
    }

    public Set<Monitor> load(String json)
    {
        ImmutableSet.Builder<Monitor> monitors = ImmutableSet.builder();
        Map<String, MonitorJson> monitorJsonMap = codec.fromJson(json);
        for (Entry<String, MonitorJson> entry : monitorJsonMap.entrySet()) {
            String name = entry.getKey();
            MonitorJson monitorJson = entry.getValue();
            Monitor monitor = new Monitor(name, monitorJson.getEventType(),
                    executor,
                    monitorJson.getEventPredicate(),
                    monitorJson.getMinOneMinuteRate(),
                    monitorJson.getMaxOneMinuteRate(),
                    alerter);
            monitors.add(monitor);
        }
        return monitors.build();
    }
}