/*
 * Copyright (c) 2017 Pantheon Technologies, 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.annotations.Beta;
import com.google.common.collect.ImmutableList;
import org.eclipse.jdt.annotation.NonNull;
import org.opendaylight.yangtools.yang.model.api.YangStmtMapping;
import org.opendaylight.yangtools.yang.model.api.meta.DeclarationReference;
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.stmt.RefineEffectiveStatement;
import org.opendaylight.yangtools.yang.model.api.stmt.RefineStatement;
import org.opendaylight.yangtools.yang.model.api.stmt.SchemaNodeIdentifier.Descendant;
import org.opendaylight.yangtools.yang.model.ri.stmt.DeclaredStatementDecorators;
import org.opendaylight.yangtools.yang.model.ri.stmt.DeclaredStatements;
import org.opendaylight.yangtools.yang.model.ri.stmt.EffectiveStatements;
import org.opendaylight.yangtools.yang.parser.api.YangParserConfiguration;
import org.opendaylight.yangtools.yang.parser.rfc7950.stmt.ArgumentUtils;
import org.opendaylight.yangtools.yang.parser.spi.meta.AbstractStatementSupport;
import org.opendaylight.yangtools.yang.parser.spi.meta.BoundStmtCtx;
import org.opendaylight.yangtools.yang.parser.spi.meta.EffectiveStmtCtx.Current;
import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext;
import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext.Mutable;
import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContextUtils;
import org.opendaylight.yangtools.yang.parser.spi.meta.SubstatementValidator;

@Beta
public abstract sealed class RefineStatementSupport
        extends AbstractStatementSupport<Descendant, RefineStatement, RefineEffectiveStatement> {
    private static final class Rfc6020 extends RefineStatementSupport {
        private static final SubstatementValidator VALIDATOR = SubstatementValidator.builder(YangStmtMapping.REFINE)
            .addOptional(YangStmtMapping.DEFAULT)
            .addOptional(YangStmtMapping.DESCRIPTION)
            .addOptional(YangStmtMapping.REFERENCE)
            .addOptional(YangStmtMapping.CONFIG)
            .addOptional(YangStmtMapping.MANDATORY)
            .addOptional(YangStmtMapping.PRESENCE)
            .addAny(YangStmtMapping.MUST)
            .addOptional(YangStmtMapping.MIN_ELEMENTS)
            .addOptional(YangStmtMapping.MAX_ELEMENTS)
            .build();

        Rfc6020(final YangParserConfiguration config) {
            super(config, VALIDATOR);
        }
    }

    private static final class Rfc7950 extends RefineStatementSupport {
        private static final SubstatementValidator VALIDATOR = SubstatementValidator.builder(YangStmtMapping.REFINE)
            .addOptional(YangStmtMapping.DEFAULT)
            .addOptional(YangStmtMapping.DESCRIPTION)
            .addOptional(YangStmtMapping.REFERENCE)
            .addOptional(YangStmtMapping.CONFIG)
            .addAny(YangStmtMapping.IF_FEATURE)
            .addOptional(YangStmtMapping.MANDATORY)
            .addOptional(YangStmtMapping.PRESENCE)
            .addAny(YangStmtMapping.MUST)
            .addOptional(YangStmtMapping.MIN_ELEMENTS)
            .addOptional(YangStmtMapping.MAX_ELEMENTS)
            .build();

        Rfc7950(final YangParserConfiguration config) {
            super(config, VALIDATOR);
        }

        @Override
        public void onFullDefinitionDeclared(
                final Mutable<Descendant, RefineStatement, RefineEffectiveStatement> stmt) {
            super.onFullDefinitionDeclared(stmt);

            if (!StmtContextUtils.evaluateIfFeatures(stmt)) {
                stmt.setUnsupported();
            }
        }
    }

    private RefineStatementSupport(final YangParserConfiguration config, final SubstatementValidator validator) {
        super(YangStmtMapping.REFINE, StatementPolicy.reject(), config, validator);
    }

    public static @NonNull RefineStatementSupport rfc6020Instance(final YangParserConfiguration config) {
        return new Rfc6020(config);
    }

    public static @NonNull RefineStatementSupport rfc7950Instance(final YangParserConfiguration config) {
        return new Rfc7950(config);
    }

    @Override
    public final Descendant parseArgumentValue(final StmtContext<?, ?, ?> ctx, final String value) {
        return ArgumentUtils.parseDescendantSchemaNodeIdentifier(ctx, value);
    }

    @Override
    protected final RefineStatement createDeclared(final BoundStmtCtx<Descendant> ctx,
            final ImmutableList<DeclaredStatement<?>> substatements) {
        return DeclaredStatements.createRefine(ctx.getRawArgument(), ctx.getArgument(), substatements);
    }

    @Override
    protected final RefineStatement attachDeclarationReference(final RefineStatement stmt,
            final DeclarationReference reference) {
        return DeclaredStatementDecorators.decorateRefine(stmt, reference);
    }

    @Override
    protected final RefineEffectiveStatement createEffective(final Current<Descendant, RefineStatement> stmt,
            final ImmutableList<? extends EffectiveStatement<?, ?>> substatements) {
        return EffectiveStatements.createRefine(stmt.declared(), substatements);
    }
}