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/**
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 *   This file is part of the LDP4j Project:
 *     http://www.ldp4j.org/
 *
 *   Center for Open Middleware
 *     http://www.centeropenmiddleware.com/
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 *   Copyright (C) 2014-2016 Center for Open Middleware.
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 *   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.
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 *   Artifact    : org.ldp4j.framework:ldp4j-application-api:0.2.1
 *   Bundle      : ldp4j-application-api-0.2.1.jar
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 */
package org.ldp4j.application.data;

import java.net.URI;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArraySet;


final class MutableProperty implements Property {

	private final class ValueAdder implements ValueVisitor {

		@Override
		public void visitLiteral(Literal value) {
			addLiteral(value);
		}

		@Override
		public void visitIndividual(Individual value) {
			addIndividual(value);
		}

	}

	private final class IndividualTranslator implements IndividualVisitor {

		private Individual newIndividual=null;

		private Individual getIndividual() {
			return this.newIndividual;
		}

		@Override
		public void visitManagedIndividual(ManagedIndividual individual) {
			this.newIndividual=dataSet().individual(individual.id(), ManagedIndividual.class);
		}

		@Override
		public void visitLocalIndividual(LocalIndividual individual) {
			this.newIndividual=dataSet().individual(individual.id(), LocalIndividual.class);
		}

		@Override
		public void visitExternalIndividual(ExternalIndividual individual) {
			this.newIndividual=dataSet().individual(individual.id(), ExternalIndividual.class);
		}

		@Override
		public void visitRelativeIndividual(RelativeIndividual individual) {
			this.newIndividual=dataSet().individual(individual.id(), RelativeIndividual.class);
		}

		@Override
		public void visitNewIndividual(NewIndividual individual) {
			this.newIndividual=dataSet().individual(individual.id(), NewIndividual.class);
		}

	}

	private final URI predicate;
	private final Individual individual;
	private final Set values;
	private final MutableDataSet dataSet;

	MutableProperty(Individual individual, MutableDataSet dataSet, URI predicate) {
		this.individual = individual;
		this.dataSet = dataSet;
		this.predicate = predicate;
		this.values=new CopyOnWriteArraySet();
	}

	MutableProperty(MutableProperty property) {
		this(property.individual,property.dataSet,property.predicate);
		this.values.addAll(property.values());
	}

	void addValue(Value value) {
		value.accept(new ValueAdder());
	}

	void removeValue(Value value) {
		this.values.remove(value);
	}

	private void addLiteral(Literal value) {
		this.values.add(value);
	}

	private MutableDataSet dataSet() {
		return this.dataSet;
	}

	private void addIndividual(Individual value) {
		Individual target=null;
		if(dataSet().hasIndividual(value.id())) {
			if(dataSet().equals(value.dataSet())) {
				target=value;
			} else {
				target=dataSet().individualOfId(value.id());
			}
		} else {
			target=addIndividualToDataset(value);
		}
		if(target!=value) {
			mergeIndividuals(value,target);
		}
		this.values.add(target);
	}

	private Individual addIndividualToDataset(Individual value) {
		IndividualTranslator translator=new IndividualTranslator();
		value.accept(translator);
		return translator.getIndividual();
	}

	private void mergeIndividuals(Individual source, Individual target) {
		for(Property property:source.properties()) {
			for(Value value:property) {
				target.addValue(property.predicate(), value);
			}
		}
	}

	@Override
	public Individual individual() {
		return this.individual;
	}

	@Override
	public URI predicate() {
		return this.predicate;
	}

	@Override
	public Iterator iterator() {
		return values().iterator();
	}

	@Override
	public Collection values() {
		return new ArrayList(this.values);
	}

	@Override
	public int numberOfValues() {
		return this.values.size();
	}

	@Override
	public boolean hasValues() {
		return !this.values.isEmpty();
	}

	@Override
	public void accept(ValueVisitor visitor) {
		for(Value value:values()) {
			value.accept(visitor);
		}
	}

	@Override
	public boolean hasLiteralValue(Literal value) {
		return Properties.hasLiteral(this,value);
	}

	@Override
	public boolean hasIdentifiedIndividual(Object id) {
		return Properties.hasIdentifiedIndividual(this,id);
	}

}