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/*
 * Copyright 2014 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.way.sql;

import java.util.Iterator;

import com.google.common.base.Joiner;
import com.google.common.base.Preconditions;

/**
 * @author [email protected] (Marcio Endo)
 */
class SqlBuilderPojo implements SqlBuilder {

  private final StringBuilder builder = new StringBuilder();
  private final Dialect dialect;

  SqlBuilderPojo(Dialect dialect) {
    this.dialect = dialect;
  }

  @Override
  public String toString() {
    return builder.toString();
  }

  @Override
  public SqlBuilder append(char character) {
    builder.append(character);
    return this;
  }

  @Override
  public SqlBuilder append(CanDecorateSqlBuilder element) {
    Preconditions.checkNotNull(element);
    return element.decorate(this);
  }

  @Override
  public SqlBuilder append(String sql) {
    Preconditions.checkNotNull(sql);

    builder.append(sql);
    return this;
  }

  public String build() {
    return builder.toString();
  }

  @Override
  public SqlBuilder endWhen() {
    return this;
  }

  @Override
  public SqlBuilder escape(String name) {
    String escaped = dialect.escape(name);
    return append(escaped);
  }

  @Override
  public SqlBuilderJoiner on(char separator) {
    return on(String.valueOf(separator));
  }

  @Override
  public SqlBuilderJoiner on(String separator) {
    Preconditions.checkNotNull(separator);
    return new SqlBuilderJoinerPojo(separator);
  }

  @Override
  public SqlBuilder qualifiedName(String first, String second) {
    String qname = dialect.qualifiedName(first, second);
    return append(qname);
  }

  @Override
  public SqlBuilder space() {
    return append(" ");
  }

  @Override
  public SqlBuilderWhen when(boolean present) {
    return present ? new SqlBuilderWhenPresent(this) : new SqlBuilderWhenAbsent(this);
  }

  private class SqlBuilderJoinerPojo implements SqlBuilderJoiner {

    private final String separator;

    public SqlBuilderJoinerPojo(String separator) {
      this.separator = separator;
    }

    @Override
    public SqlBuilder join(Iterable elements) {
      SqlBuilder builder = SqlBuilderPojo.this;
      Iterator iterator = elements.iterator();
      if (iterator.hasNext()) {
        CanDecorateSqlBuilder element = iterator.next();
        element.decorate(builder);
        while (iterator.hasNext()) {
          element = iterator.next();
          builder.append(separator);
          element.decorate(builder);
        }
      }
      return builder;
    }

    @Override
    public SqlBuilder join(String[] strings) {
      String sql = Joiner.on(separator).join(strings);
      return append(sql);
    }

  }

}