/*
 * Copyright 2004-2015 the Seasar Foundation and the Others.
 *
 * 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 org.seasar.extension.jdbc.gen.internal.model;

import javax.persistence.JoinColumn;

import org.seasar.extension.jdbc.gen.desc.AssociationDesc;
import org.seasar.extension.jdbc.gen.desc.AssociationType;
import org.seasar.extension.jdbc.gen.model.AssociationModel;
import org.seasar.extension.jdbc.gen.model.AssociationModelFactory;
import org.seasar.extension.jdbc.gen.model.JoinColumnModel;
import org.seasar.extension.jdbc.gen.model.JoinColumnsModel;

/**
 * {@link AssociationModelFactory}の実装クラスです。
 * 
 * @author taedium
 */
public class AssociationModelFactoryImpl implements AssociationModelFactory {

    /** {@link JoinColumn}を表示する場合{@code true} */
    protected boolean showJoinColumn;

    /**
     * インスタンスを構築します。
     * 
     * @param showJoinColumn
     *            {@link JoinColumn}を表示する場合{@code true}
     */
    public AssociationModelFactoryImpl(boolean showJoinColumn) {
        this.showJoinColumn = showJoinColumn;
    }

    public AssociationModel getAssociationModel(AssociationDesc associationDesc) {
        AssociationModel model = new AssociationModel();
        model.setName(associationDesc.getName());
        if (associationDesc.getAssociationType() == AssociationType.ONE_TO_MANY) {
            String entityName = associationDesc.getReferencedEntityDesc()
                    .getName();
            model.setShortClassName("List<" + entityName + ">");
        } else {
            model.setShortClassName(associationDesc.getReferencedEntityDesc()
                    .getName());
        }
        model.setAssociationType(associationDesc.getAssociationType());
        model.setMappedBy(associationDesc.getMappedBy());
        if (associationDesc.getColumnNameList().size() == 1) {
            doJoinColumnModel(model, associationDesc);
        } else if (associationDesc.getColumnNameList().size() > 1) {
            doJoinColumnsModel(model, associationDesc);
        }
        return model;
    }

    /**
     * 結合カラムモデルを処理します。
     * 
     * @param associationModel
     *            関連モデル
     * @param associationDesc
     *            関連記述
     */
    protected void doJoinColumnModel(AssociationModel associationModel,
            AssociationDesc associationDesc) {
        String propertyName = associationDesc.getName();
        String columnName = associationDesc.getColumnNameList().get(0);
        String referencedColumnName = associationDesc
                .getReferencedColumnNameList().get(0);
        if (showJoinColumn
                || !matchesDefaultMappingRule(propertyName, columnName,
                        referencedColumnName)) {
            JoinColumnModel joinColumnModel = new JoinColumnModel();
            joinColumnModel.setName(columnName);
            joinColumnModel.setReferencedColumnName(referencedColumnName);
            associationModel.setJoinColumnModel(joinColumnModel);
        }
    }

    /**
     * 結合カラムのデフォルトのマッピングルールに合致する場合{@code true}を返します。
     * 
     * @param propertyName
     *            プロパティ名
     * @param columnName
     *            参照する側のカラム名
     * @param referencedColumnName
     *            参照される側のカラム名
     * @return 結合カラムの命名規約に合致する場合{@code true}
     */
    protected boolean matchesDefaultMappingRule(String propertyName,
            String columnName, String referencedColumnName) {
        return columnName.equalsIgnoreCase(propertyName + "_"
                + referencedColumnName);
    }

    /**
     * 複合結合カラムモデルを処理します。
     * 
     * @param associationModel
     *            関連モデル
     * @param associationDesc
     *            関連記述
     */
    protected void doJoinColumnsModel(AssociationModel associationModel,
            AssociationDesc associationDesc) {
        JoinColumnsModel joinColumnsModel = new JoinColumnsModel();
        int i = 0;
        for (String name : associationDesc.getColumnNameList()) {
            String referencedColumnName = associationDesc
                    .getReferencedColumnNameList().get(i);
            JoinColumnModel joinColumnModel = new JoinColumnModel();
            joinColumnModel.setName(name);
            joinColumnModel.setReferencedColumnName(referencedColumnName);
            joinColumnsModel.addJoinColumnModel(joinColumnModel);
            i++;
        }
        associationModel.setJoinColumnsModel(joinColumnsModel);
    }

}