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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.druid.indexing.materializedview;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.google.common.base.Preconditions;
import com.google.common.base.Strings;
import com.google.common.collect.Sets;
import org.apache.druid.indexing.overlord.DataSourceMetadata;

import java.util.Objects;
import java.util.Set;

public class DerivativeDataSourceMetadata implements DataSourceMetadata 
{
  private final String baseDataSource;
  private final Set dimensions;
  private final Set metrics;

  @JsonCreator
  public DerivativeDataSourceMetadata(
      @JsonProperty("baseDataSource") String baseDataSource,
      @JsonProperty("dimensions") Set dimensions,
      @JsonProperty("metrics") Set metrics
  )
  {
    Preconditions.checkArgument(!Strings.isNullOrEmpty(baseDataSource), "baseDataSource cannot be null or empty. Please provide a baseDataSource.");
    this.baseDataSource = baseDataSource;

    this.dimensions = Preconditions.checkNotNull(dimensions, "dimensions cannot be null. This is not a valid DerivativeDataSourceMetadata.");
    this.metrics = Preconditions.checkNotNull(metrics, "metrics cannot be null. This is not a valid DerivativeDataSourceMetadata.");
  }

  @JsonProperty("baseDataSource")
  public String getBaseDataSource()
  {
    return baseDataSource;
  }

  @JsonProperty("dimensions")
  public Set getDimensions()
  {
    return dimensions;
  }

  @JsonProperty("metrics")
  public Set getMetrics()
  {
    return metrics;
  }
  
  @Override
  public boolean isValidStart()
  {
    return false;
  }

  @Override
  public DataSourceMetadata asStartMetadata()
  {
    return this;
  }

  @Override
  public boolean matches(DataSourceMetadata other) 
  {
    return equals(other);
  }

  @Override
  public DataSourceMetadata plus(DataSourceMetadata other)
  {
    throw new UnsupportedOperationException("Derivative dataSource metadata is not allowed to plus");
  }

  @Override
  public DataSourceMetadata minus(DataSourceMetadata other) 
  {
    throw new UnsupportedOperationException("Derivative dataSource metadata is not allowed to minus");
  }
  
  @Override
  public boolean equals(Object o)
  {
    if (this == o) {
      return true;
    }
    if (o == null || getClass() != o.getClass()) {
      return false;
    }
    DerivativeDataSourceMetadata that = (DerivativeDataSourceMetadata) o;

    return baseDataSource.equals(that.getBaseDataSource()) && 
        dimensions.equals(that.getDimensions()) &&
        metrics.equals(that.getMetrics());
  }

  @Override
  public int hashCode()
  {
    return Objects.hash(baseDataSource, dimensions, metrics);
  }

  public Set getColumns()
  {
    Set fields = Sets.newHashSet(dimensions);
    fields.addAll(metrics);
    return fields;
  }
  
  @Override
  public String toString()
  {
    return "DerivedDataSourceMetadata{" +
        "baseDataSource=" + baseDataSource +
        ", dimensions=" + dimensions +
        ", metrics=" + metrics +
        '}';
  }
}