/**
 * Copyright (c) 2016 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 com.google.common.collect.ImmutableList;
import java.util.Collection;
import java.util.Objects;
import javax.annotation.Nonnull;
import org.opendaylight.yangtools.yang.model.api.YangStmtMapping;
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.StatementSource;
import org.opendaylight.yangtools.yang.model.api.stmt.ConfigStatement;

abstract class EmptyConfigStatement implements ConfigStatement {
    static final ConfigStatement FALSE = new EmptyConfigStatement() {
        @Override
        public boolean getValue() {
            return false;
        }

        @Override
        EffectiveStatement<Boolean, ConfigStatement> toEffective() {
            return EmptyConfigEffectiveStatement.FALSE;
        }
    };

    static final ConfigStatement TRUE = new EmptyConfigStatement() {
        @Override
        public boolean getValue() {
            return true;
        }

        @Override
        EffectiveStatement<Boolean, ConfigStatement> toEffective() {
            return EmptyConfigEffectiveStatement.TRUE;
        }
    };

    private EmptyConfigStatement() {
        // Invisible on purpose
    }

    abstract EffectiveStatement<Boolean, ConfigStatement> toEffective();

    @Nonnull
    @Override
    public final Collection<? extends DeclaredStatement<?>> declaredSubstatements() {
        return ImmutableList.of();
    }

    @Nonnull
    @Override
    public final StatementDefinition statementDefinition() {
        return YangStmtMapping.CONFIG;
    }

    @Override
    public final String rawArgument() {
        return Boolean.toString(getValue());
    }

    @Override
    public final Boolean argument() {
        return Boolean.valueOf(getValue());
    }

    @Nonnull
    @Override
    public final StatementSource getStatementSource() {
        return StatementSource.DECLARATION;
    }

    @Override
    public final int hashCode() {
        return Objects.hash(statementDefinition(), getStatementSource(), argument(),
            rawArgument(), declaredSubstatements(), getValue());
    }

    @Override
    public final boolean equals(final Object obj) {
        if (this == obj) {
            return true;
        }
        if (!(obj instanceof ConfigStatement)) {
            return false;
        }

        final ConfigStatement other = (ConfigStatement) obj;

        return  getValue() == other.getValue() && argument().equals(other.argument()) &&
                rawArgument().equals(other.rawArgument()) &&
                statementDefinition().equals(other.statementDefinition()) &&
                getStatementSource().equals(other.getStatementSource()) &&
                declaredSubstatements().equals(other.declaredSubstatements());
    }
}