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/*
 * Copyright 2012 Metamarkets Group 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.metamx.emitter.service;

import com.fasterxml.jackson.annotation.JsonValue;
import com.google.common.collect.ImmutableMap;
import org.joda.time.DateTime;

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

/**
 */
public class AlertEvent implements ServiceEvent
{
  private final ImmutableMap serviceDimensions;
  private final Severity severity;
  private final String description;
  private final DateTime createdTime;

  private final Map dataMap;

  public AlertEvent(
      DateTime createdTime,
      ImmutableMap serviceDimensions,
      Severity severity,
      String description,
      Map dataMap
  )
  {
    this.createdTime = createdTime;
    this.serviceDimensions = serviceDimensions;
    this.severity = severity;
    this.description = description;
    this.dataMap = dataMap;
  }

  public AlertEvent(
      DateTime createdTime,
      String service,
      String host,
      Severity severity,
      String description,
      Map dataMap
  )
  {
    this(createdTime, ImmutableMap.of("service", service, "host", host), severity, description, dataMap);
  }

  public AlertEvent(
      String service,
      String host,
      Severity severity,
      String description,
      Map dataMap
  )
  {
    this(new DateTime(), service, host, severity, description, dataMap);
  }

  public AlertEvent(
      String service,
      String host,
      String description,
      Map dataMap
  )
  {
    this(new DateTime(), service, host, Severity.DEFAULT, description, dataMap);
  }

  public AlertEvent(
      String service,
      String host,
      String description
  )
  {
    this(new DateTime(), service, host, Severity.DEFAULT, description, ImmutableMap.of());
  }

  public DateTime getCreatedTime()
  {
    return createdTime;
  }

  public String getFeed()
  {
    return "alerts";
  }

  public String getService()
  {
    return serviceDimensions.get("service");
  }

  public String getHost()
  {
    return serviceDimensions.get("host");
  }

  public Severity getSeverity()
  {
    return severity;
  }

  public String getDescription()
  {
    return description;
  }

  public Map getDataMap()
  {
    return Collections.unmodifiableMap(dataMap);
  }

  public boolean isSafeToBuffer()
  {
    return false;
  }

  @Override
  @JsonValue
  public Map toMap()
  {
    return ImmutableMap.builder()
        .put("feed", getFeed())
        .put("timestamp", createdTime.toString())
        .putAll(serviceDimensions)
        .put("severity", severity.toString())
        .put("description", description)
        .put("data", dataMap)
        .build();
  }

  public static enum Severity
  {
    ANOMALY
    {
      @Override
      public String toString()
      {
        return "anomaly";
      }
    },

    COMPONENT_FAILURE
    {
      @Override
      public String toString()
      {
        return "component-failure";
      }
    },

    SERVICE_FAILURE
    {
      @Override
      public String toString()
      {
        return "service-failure";
      }
    };

    public static final Severity DEFAULT = COMPONENT_FAILURE;
  }
}