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/*
 * 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.
 *
 * Other licenses:
 * -----------------------------------------------------------------------------
 * Commercial licenses for this work are available. These replace the above
 * ASL 2.0 and offer limited warranties, support, maintenance, and commercial
 * database integrations.
 *
 * For more information, please visit: http://www.jooq.org/licenses
 *
 *
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 */
package org.jooq.meta;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

public class DefaultForeignKeyDefinition extends AbstractDefinition implements ForeignKeyDefinition {

    private final List keyColumns;
    private final TableDefinition        table;
    private final UniqueKeyDefinition    uniqueKey;

    public DefaultForeignKeyDefinition(SchemaDefinition schema, String name, TableDefinition table,
        UniqueKeyDefinition uniqueKey) {

        super(schema.getDatabase(), schema, name, null);

        this.keyColumns = new ArrayList<>();
        this.table = table;
        this.uniqueKey = uniqueKey;
    }

    @Override
    public List getDefinitionPath() {
        List result = new ArrayList<>();

        result.addAll(getSchema().getDefinitionPath());
        result.add(this);

        return result;
    }

    @Override
    public TableDefinition getKeyTable() {
        return table;
    }

    @Override
    public List getKeyColumns() {
        return keyColumns;
    }

    @Override
    public UniqueKeyDefinition getReferencedKey() {
        return uniqueKey;
    }

    @Override
    public TableDefinition getReferencedTable() {
        return uniqueKey.getTable();
    }

    @Override
    public List getReferencedColumns() {
        return uniqueKey.getKeyColumns();
    }

    @Override
    public int countSimilarReferences() {
        Set keys = new HashSet<>();

        for (ForeignKeyDefinition key : getDatabase().getRelations().getForeignKeys(table)) {
            if (key.getReferencedTable().equals(getReferencedTable())) {
                keys.add(key.getName());
            }
        }

        return keys.size();
    }
}