/**
 * Copyright (c) 2015 Cisco Systems, Inc. and others.  All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 */
package org.opendaylight.yangtools.yang.parser.stmt.rfc6020;

import java.util.Map;
import javax.annotation.Nonnull;
import org.opendaylight.yangtools.yang.common.QName;
import org.opendaylight.yangtools.yang.model.api.meta.DeclaredStatement;
import org.opendaylight.yangtools.yang.model.api.meta.EffectiveStatement;
import org.opendaylight.yangtools.yang.parser.spi.meta.NamespaceBehaviour;
import org.opendaylight.yangtools.yang.parser.spi.meta.StatementNamespace;
import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext;
import org.opendaylight.yangtools.yang.parser.spi.source.SourceException;

/**
 * Statement local namespace, which holds direct schema node descendants.
 *
 * @param <D>
 * @param <E>
 */
public class ChildSchemaNodes<D extends DeclaredStatement<QName>, E extends EffectiveStatement<QName, D>>
    extends NamespaceBehaviour<QName, StmtContext<?, D, E>, ChildSchemaNodes<D, E>>
    implements StatementNamespace<QName, D, E> {

    public ChildSchemaNodes() {
        super((Class) ChildSchemaNodes.class);
    }

    @Override
    public StmtContext<?, D, E> get(@Nonnull final QName key) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public StmtContext<?, D, E> getFrom(final NamespaceStorageNode storage, final QName key) {
        return globalOrStatementSpecific(storage).getFromLocalStorage(getIdentifier(), key);
    }

    @Override
    public Map<QName, StmtContext<?, D, E>> getAllFrom(final NamespaceStorageNode storage) {
        // TODO Auto-generated method stub
        return null;
    }

    @SuppressWarnings("unchecked")
    @Override
    public void addTo(final NamespaceStorageNode storage, final QName key, final StmtContext<?, D, E> value) {
        final StmtContext<?, D, E> prev = globalOrStatementSpecific(storage).putToLocalStorageIfAbsent(
            ChildSchemaNodes.class, key, value);

        if (prev != null) {
            throw new SourceException(value.getStatementSourceReference(),
                "Error in module '%s': cannot add '%s'. Node name collision: '%s' already declared at %s",
                value.getRoot().getStatementArgument(), key, prev.getStatementArgument(),
                prev.getStatementSourceReference());
        }
    }

    private static NamespaceStorageNode globalOrStatementSpecific(final NamespaceStorageNode storage) {
        NamespaceStorageNode current = storage;
        while (!isLocalOrGlobal(current.getStorageNodeType())) {
            current = current.getParentNamespaceStorage();
        }
        return current;
    }

    private static boolean isLocalOrGlobal(final StorageNodeType type) {
        return type == StorageNodeType.STATEMENT_LOCAL || type == StorageNodeType.GLOBAL;
    }
}