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package com.algolia.search;

import com.algolia.search.models.common.CallType;
import com.algolia.search.models.common.CompressionType;
import com.algolia.search.util.AlgoliaUtils;
import java.util.Collections;
import java.util.EnumSet;
import java.util.List;
import java.util.Objects;
import javax.annotation.Nonnull;

public class PersonalizationConfig extends ConfigBase {

  public static class Builder extends ConfigBase.Builder {
    /**
     * Creates an {@link PersonalizationConfig} with the default hosts
     *
     * @param applicationID The Application ID
     * @param apiKey The API Key
     * @param region Region where your personalization data is stored and processed.
     */
    public Builder(@Nonnull String applicationID, @Nonnull String apiKey, @Nonnull String region) {
      super(applicationID, apiKey, createPersonalizationHosts(region), CompressionType.NONE);
    }

    @Override
    public PersonalizationConfig.Builder getThis() {
      return this;
    }

    public PersonalizationConfig build() {
      return new PersonalizationConfig(this);
    }

    /** Create hosts for the recommendation configuration */
    private static List createPersonalizationHosts(@Nonnull String region) {

      Objects.requireNonNull(region, "The region can't be null");

      if (AlgoliaUtils.isEmptyWhiteSpace(region)) {
        throw new IllegalArgumentException("The region is required. It can't be empty.");
      }

      return Collections.singletonList(
          new StatefulHost(
              String.format("personalization.%s.algolia.com", region),
              EnumSet.of(CallType.READ, CallType.WRITE)));
    }
  }

  private PersonalizationConfig(Builder builder) {
    super(builder);
  }
}