/*
 * Copyright (c) 2020 PANTHEON.tech, s.r.o. 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.rfc7950.stmt.meta;

import com.google.common.collect.ImmutableList;
import org.eclipse.jdt.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.model.api.meta.StatementDefinition;
import org.opendaylight.yangtools.yang.model.api.meta.StatementOrigin;
import org.opendaylight.yangtools.yang.model.api.stmt.SchemaTreeEffectiveStatement;
import org.opendaylight.yangtools.yang.parser.spi.meta.AbstractSchemaTreeStatementSupport;
import org.opendaylight.yangtools.yang.parser.spi.meta.EffectiveStmtCtx.Current;

/**
 * A massively-misnamed superclass for statements which are both schema tree participants and can be created as implicit
 * nodes. This covers {@code case}, {@code input} and {@code output} statements.
 *
 * @param <D> Declared Statement representation
 * @param <E> Effective Statement representation
 */
abstract class AbstractImplicitStatementSupport<D extends DeclaredStatement<QName>,
        E extends SchemaTreeEffectiveStatement<D>> extends AbstractSchemaTreeStatementSupport<D, E> {
    AbstractImplicitStatementSupport(final StatementDefinition publicDefinition,
            final StatementPolicy<QName, D> policy) {
        super(publicDefinition, policy);
    }

    @Override
    public final E copyEffective(final Current<QName, D> stmt, final E original) {
        final StatementOrigin source = stmt.origin();
        switch (source) {
            case CONTEXT:
                return copyUndeclaredEffective(stmt, original);
            case DECLARATION:
                return copyDeclaredEffective(stmt, original);
            default:
                throw new IllegalStateException("Unhandled statement source " + source);
        }
    }

    @Override
    protected E createEffective(final Current<QName, D> stmt,
            final ImmutableList<? extends EffectiveStatement<?, ?>> substatements) {
        final StatementOrigin origin = stmt.origin();
        switch (origin) {
            case CONTEXT:
                return createUndeclaredEffective(stmt, substatements);
            case DECLARATION:
                return createDeclaredEffective(stmt, substatements);
            default:
                throw new IllegalStateException("Unhandled statement origin " + origin);
        }
    }

    abstract @NonNull E copyDeclaredEffective(@NonNull Current<QName, D> stmt, @NonNull E original);

    abstract @NonNull E copyUndeclaredEffective(@NonNull Current<QName, D> stmt, @NonNull E original);

    abstract @NonNull E createDeclaredEffective(@NonNull Current<QName, D> stmt,
            @NonNull ImmutableList<? extends EffectiveStatement<?, ?>> substatements);

    abstract @NonNull E createUndeclaredEffective(@NonNull Current<QName, D> stmt,
            @NonNull ImmutableList<? extends EffectiveStatement<?, ?>> substatements);
}