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/*
 * Copyright 2015 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.compiler;

import java.util.List;

import br.com.objectos.way.code.ImportInfoSet;
import br.com.objectos.way.core.tmpl.mustache.IsMustacheSerializable;
import br.com.objectos.way.core.tmpl.mustache.MustacheObject;
import br.com.objectos.way.core.tmpl.mustache.Mustaches;
import br.com.objectos.way.core.util.WayIterables;
import br.com.objectos.way.sql.ColumnInfo;
import br.com.objectos.way.sql.ForeignKey;
import br.com.objectos.way.sql.GeneratedValue;
import br.com.objectos.way.sql.IndexedColumnInfo;
import br.com.objectos.way.sql.PrimaryKey;
import br.com.objectos.way.sql.TableInfo;

import com.google.common.base.Function;

/**
 * @author [email protected] (Marcio Endo)
 */
class DefinesColumn implements IsMustacheSerializable {

  private final TableInfo tableInfo;
  private final ColumnInfo columnInfo;
  private final List foreignKeys;

  private DefinesColumn(TableInfo tableInfo, ColumnInfo columnInfo, List foreignKeys) {
    this.tableInfo = tableInfo;
    this.columnInfo = columnInfo;
    this.foreignKeys = foreignKeys;
  }

  public static DefinesColumn of(TableInfo tableInfo, ColumnInfo columnInfo) {
    List columnInfoList = tableInfo.getReferencedColumnInfoList(columnInfo);
    List foreignKeys = WayIterables.from(columnInfoList)
        .transform(new ColumnInfoToIndexedColumnInfo(columnInfoList.size()))
        .toImmutableList();
    return new DefinesColumn(tableInfo, columnInfo, foreignKeys);
  }

  @Override
  public MustacheObject toMustache() {
    return Mustaches.toMustacheHelper()
        .addValue(columnInfo)
        .add("autoIncrement", autoIncrement())
        .add("foreignKey", foreignKey())
        .add("foreignKeys", foreignKeys)
        .add("primaryKey", primaryKey())
        .toMustache();
  }

  public void addTo(ImportInfoSet importInfoSet) {
    columnInfo.addTo(importInfoSet);

    if (autoIncrement()) {
      importInfoSet.add(GeneratedValue.class);
    }

    if (foreignKey()) {
      importInfoSet.add(ForeignKey.class);
    }

    if (primaryKey()) {
      importInfoSet.add(PrimaryKey.class);
    }
  }

  boolean autoIncrement() {
    return columnInfo.autoIncrement();
  }

  boolean foreignKey() {
    return foreignKeys.size() > 0;
  }

  boolean primaryKey() {
    return tableInfo.isPrimaryKey(columnInfo);
  }

  private static class ColumnInfoToIndexedColumnInfo implements Function {

    private final int size;
    private int index = 0;

    public ColumnInfoToIndexedColumnInfo(int size) {
      this.size = size;
    }

    @Override
    public IndexedColumnInfo apply(ColumnInfo input) {
      return IndexedColumnInfo.get(input, index++, size);
    }

  }

}