// Copyright 2017 JanusGraph Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package org.janusgraph.graphdb.relations;

import com.google.common.base.Preconditions;
import org.janusgraph.core.*;
import org.janusgraph.graphdb.internal.InternalVertex;
import org.apache.tinkerpop.gremlin.structure.Property;
import org.apache.tinkerpop.gremlin.structure.util.StringFactory;

import java.util.Iterator;

/**
 * @author Matthias Broecheler (me@matthiasb.com)
 */

public abstract class AbstractVertexProperty<V> extends AbstractTypedRelation implements JanusGraphVertexProperty<V> {

    private InternalVertex vertex;
    private final Object value;

    public AbstractVertexProperty(long id, PropertyKey type, InternalVertex vertex, Object value) {
        super(id, type);
        Preconditions.checkNotNull(vertex, "null vertex");
        Preconditions.checkNotNull(value, "null value for property key %s",type);
        this.vertex=vertex;
        this.value=value;
    }

    @Override
    public String toString() {
        return StringFactory.propertyString(this);
    }

    public void setVertexAt(int pos, InternalVertex vertex) {
        Preconditions.checkArgument(pos==0 && vertex!=null && this.vertex.equals(vertex));
        this.vertex=vertex;
    }

    @Override
    public InternalVertex getVertex(int pos) {
        if (pos==0) return vertex;
        else throw new IllegalArgumentException("Invalid position: " + pos);
    }

    @Override
    public JanusGraphTransaction graph() {
        return vertex.graph();
    }

    @Override
    public <U> Iterator<Property<U>> properties(final String... propertyKeys) {
        return super.properties(propertyKeys);
    }

    @Override
    public final int getArity() {
        return 1;
    }

    @Override
    public final int getLen() {
        return 1;
    }

    @Override
    public JanusGraphVertex element() {
        return vertex;
    }

    @Override
    public V value() {
        return (V)value;
    }

    @Override
    public boolean isProperty() {
        return true;
    }

    @Override
    public boolean isEdge() {
        return false;
    }

    @Override
    public boolean isPresent() {
        return true;
    }

}