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/*
 * Copyright 2016 Objectos, Fábrica de Software LTDA.
 *
 * 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 br.com.objectos.schema;

import java.util.List;

import br.com.objectos.core.util.ImmutableList;
import br.com.objectos.core.util.MoreCollectors;
import br.com.objectos.db.SchemaBuilder;
import br.com.objectos.db.SchemaElement;
import br.com.objectos.pojo.Pojo;
import br.com.objectos.testable.Equality;
import br.com.objectos.testable.Testable;

/**
 * @author [email protected] (Marcio Endo)
 */
@Pojo
public abstract class PrimaryKeyDef
    implements
    SchemaElement,
    Testable {

  private static final PrimaryKeyDef EMPTY = new Empty();

  abstract List columnDefList();

  PrimaryKeyDef() {
  }

  public static PrimaryKeyDefBuilder builder() {
    return new PrimaryKeyDefBuilderPojo();
  }

  static PrimaryKeyDef empty() {
    return EMPTY;
  }

  static PrimaryKeyDef of(List primaryKeyColumnRefList) {
    return primaryKeyColumnRefList.isEmpty()
        ? EMPTY
        : PrimaryKeyDef.builder()
            .columnDefList(primaryKeyColumnRefList.stream()
                .map(ColumnName::toColumnDef)
                .collect(MoreCollectors.toImmutableList()))
            .build();
  }

  @Override
  public SchemaBuilder acceptSchemaElement(SchemaBuilder sql) {
    return sql.primaryKey(columnDefList());
  }

  private static class Empty extends PrimaryKeyDef {

    @Override
    public SchemaBuilder acceptSchemaElement(SchemaBuilder sql) {
      return sql;
    }

    @Override
    public Equality isEqualTo(Object that) {
      return Equality.instanceOf(that, Empty.class);
    }

    @Override
    List columnDefList() {
      return ImmutableList.of();
    }

  }

}