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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.ArrayList;
import java.util.List;
import java.util.Objects;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import br.com.objectos.db.Dialect;

/**
 * @author [email protected] (Marcio Endo)
 */
class RecordingConfiguration implements Configuration {

  private static final String LINE_SEPARATOR = System.getProperty("line.separator");

  private final List tableDslList = new ArrayList<>();

  @Override
  public AlterTableDsl alterTable(String tableName) {
    Objects.requireNonNull(tableName);
    AlterTableDslPojo pojo = new AlterTableDslPojo(tableName);
    tableDslList.add(pojo);
    return pojo;
  }

  public SchemaDef build() throws DdlException {
    TableDefVisitor table = new TableDefVisitor();
    TableDefMap tableDefMap = execute(table);
    return SchemaDef.of(tableDefMap);
  }

  @Override
  public CreateTableDsl createTable(String tableName) {
    Objects.requireNonNull(tableName);
    CreateTableDslPojo pojo = new CreateTableDslPojo(tableName);
    tableDslList.add(pojo);
    return pojo;
  }

  public String toString(Dialect dialect) {
    return stream()
        .map(exe -> exe.toString(dialect))
        .collect(Collectors.joining(LINE_SEPARATOR));
  }

  TableDefMap execute(TableDefVisitor table) throws DdlException {
    List tableDdlList = stream().collect(Collectors.toList());
    for (TableDdl ddl : tableDdlList) {
      ddl.accept(table);
    }
    return table.build();
  }

  private Stream stream() {
    return tableDslList.stream().map(TableDsl::compile);
  }

}