/*
 * Copyright (C) 2019 Google 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.google.cloud.teleport.splunk;

import static com.google.common.base.Preconditions.checkNotNull;

import com.google.auto.value.AutoValue;
import com.google.gson.JsonObject;
import com.google.gson.annotations.SerializedName;
import javax.annotation.Nullable;

/**
 * A class for Splunk events.
 */
@AutoValue
public abstract class SplunkEvent {

  public static Builder newBuilder() {
    return new AutoValue_SplunkEvent.Builder();
  }

  @Nullable
  public abstract Long time();

  @Nullable
  public abstract String host();

  @Nullable
  public abstract String source();

  @Nullable
  @SerializedName("sourcetype")
  public abstract String sourceType();
  
  @Nullable
  public abstract String index();
  
  @Nullable
  public abstract JsonObject fields();
  
  @Nullable
  public abstract String event();

  /**
   * A builder class for creating {@link SplunkEvent} objects.
   */
  @AutoValue.Builder
  public abstract static class Builder {

    abstract Builder setTime(Long time);

    abstract Builder setHost(String host);

    abstract Builder setSource(String source);

    abstract Builder setSourceType(String sourceType);

    abstract Builder setIndex(String index);

    abstract Builder setEvent(String event);
  
    abstract Builder setFields(JsonObject fields);
  
    abstract String event();

    abstract SplunkEvent autoBuild();

    public Builder withTime(Long time) {
      checkNotNull(time, "withTime(time) called with null input.");

      return setTime(time);
    }

    public Builder withHost(String host) {
      checkNotNull(host, "withHost(host) called with null input.");

      return setHost(host);
    }

    public Builder withSource(String source) {
      checkNotNull(source, "withSource(source) called with null input.");

      return setSource(source);
    }

    public Builder withSourceType(String sourceType) {
      checkNotNull(sourceType, "withSourceType(sourceType) called with null input.");

      return setSourceType(sourceType);
    }

    public Builder withIndex(String index) {
      checkNotNull(index, "withIndex(index) called with null input.");

      return setIndex(index);
    }
  
    public Builder withFields(JsonObject fields) {
      checkNotNull(fields, "withFields(fields) called with null input.");
    
      return setFields(fields);
    }

    public Builder withEvent(String event) {
      checkNotNull(event, "withEvent(event) called with null input.");

      return setEvent(event);
    }

    public SplunkEvent build() {
      checkNotNull(event(), "Event information is required.");
      return autoBuild();
    }

  }
}