/*
 * Copyright (c) 2015 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.model.ri.type;

import static java.util.Objects.requireNonNull;

import com.google.common.base.MoreObjects;
import java.util.Collection;
import java.util.Optional;
import org.eclipse.jdt.annotation.NonNull;
import org.opendaylight.yangtools.yang.common.QName;
import org.opendaylight.yangtools.yang.model.api.Status;
import org.opendaylight.yangtools.yang.model.api.TypeDefinition;
import org.opendaylight.yangtools.yang.model.api.UnknownSchemaNode;

abstract class AbstractDerivedType<T extends TypeDefinition<T>> extends AbstractTypeDefinition<T> {
    private final @NonNull T baseType;
    private final Object defaultValue;
    private final String description;
    private final String reference;
    private final @NonNull Status status;
    private final String units;

    AbstractDerivedType(final T baseType, final QName qname, final Object defaultValue, final String description,
            final String reference, final Status status, final String units,
            final Collection<? extends UnknownSchemaNode> unknownSchemNodes) {
        super(qname, unknownSchemNodes);
        this.baseType = requireNonNull(baseType);
        this.status = requireNonNull(status);
        this.defaultValue = defaultValue;
        this.description = description;
        this.reference = reference;
        this.units = units;
    }

    @Override
    public final T getBaseType() {
        return baseType instanceof AbstractRestrictedType ? baseType.getBaseType() : baseType;
    }

    /**
     * Return the stored base type. Unlike {@link #getBaseType()}, this method returns the underlying restricted type.
     */
    final T baseType() {
        return baseType;
    }

    @Override
    public final Optional<? extends Object> getDefaultValue() {
        return defaultValue != null ? Optional.of(defaultValue) : baseType.getDefaultValue();
    }

    @Override
    public final Optional<String> getDescription() {
        return Optional.ofNullable(description);
    }

    @Override
    public final Optional<String> getReference() {
        return Optional.ofNullable(reference);
    }

    @Override
    public final Status getStatus() {
        return status;
    }

    @Override
    public final Optional<String> getUnits() {
        return units != null ? Optional.of(units) : baseType.getUnits();
    }

    @Override
    public final String toString() {
        return MoreObjects.toStringHelper(this).omitNullValues()
                .add("baseType", baseType)
                .add("default", defaultValue)
                .add("description", description)
                .add("qname", getQName())
                .add("reference", reference)
                .add("status", status)
                .add("units", units).toString();
    }
}