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/*
 * Copyright 2016-2024 Crown Copyright
 *
 * 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 uk.gov.gchq.gaffer.tinkerpop;

import org.apache.tinkerpop.gremlin.structure.Property;
import org.apache.tinkerpop.gremlin.structure.VertexProperty;
import org.apache.tinkerpop.gremlin.structure.util.ElementHelper;
import org.apache.tinkerpop.gremlin.structure.util.StringFactory;

import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;

public class GafferPopVertexProperty extends GafferPopElement implements VertexProperty {
    protected Map properties;
    private final GafferPopVertex vertex;
    private final String key;
    private final V value;

    public GafferPopVertexProperty(final GafferPopVertex vertex, final String key, final V value, final Object... propertyKeyValues) {
        super(key, String.format("[%s,%s,%s]", vertex.id(), key, value), vertex.graph());
        this.vertex = vertex;
        this.key = key;
        this.value = value;
        ElementHelper.legalPropertyKeyValueArray(propertyKeyValues);
        ElementHelper.attachProperties(this, propertyKeyValues);
    }

    @Override
    public String key() {
        return key;
    }

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

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

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

    @SuppressWarnings("EqualsWhichDoesntCheckParameterClass")
    @Override
    public boolean equals(final Object object) {
        return ElementHelper.areEqual(this, object);
    }

    @Override
    public int hashCode() {
        return ElementHelper.hashCode((org.apache.tinkerpop.gremlin.structure.Element) this);
    }

    @Override
    public Set keys() {
        return null == properties ? Collections.emptySet() : properties.keySet();
    }

    @Override
    public  Property property(final String key) {
        return null == properties ? Property.empty() : properties.getOrDefault(key, Property.empty());
    }

    @Override
    public  Property property(final String key, final U value) {
        if (isReadOnly() || vertex.isReadOnly()) {
            throw new IllegalStateException("Updates are not supported");
        }

        final Property property = new GafferPopProperty<>(this, key, value);
        if (properties == null) {
            properties = new HashMap<>();
        }
        properties.put(key, property);
        return property;
    }

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

    @Override
    public  Iterator> properties(final String... propertyKeys) {
        if (null == properties) {
            return Collections.emptyIterator();
        }

        return properties.entrySet().stream()
            .filter(entry -> ElementHelper.keyExists(entry.getKey(), propertyKeys))
            .map(entry -> (Property) entry.getValue())
            .collect(Collectors.toList())
            .iterator();
    }

    @Override
    public void remove() {
        throw Property.Exceptions.propertyRemovalNotSupported();
    }
}