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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:0.2.2
 *   Bundle      : ldp4j-application-api-0.2.2.jar
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 */
package org.ldp4j.application.data;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Set;

import com.google.common.collect.Maps;


final class MutableDataSet implements DataSet {

	private final class IndividualRemover implements ValueVisitor {

		private final Property property;
		private final Individual src;
		private final Individual individual;

		private IndividualRemover(Property property, Individual src, Individual individual) {
			this.property = property;
			this.src = src;
			this.individual = individual;
		}

		@Override
		public void visitLiteral(Literal value) {
			// Nothing to do
		}

		@Override
		public void visitIndividual(Individual value) {
			if(value==this.src) {
				this.individual.removeValue(this.property.predicate(), value);
			}
		}
	}

	private final Name name;
	private final Map> individuals;
	private final IndividualFactory factory;

	MutableDataSet(Name name) {
		this.name = name;
		this.individuals=Maps.newLinkedHashMap();
		this.factory=new IndividualFactory(this);
	}

	@Override
	public Name name() {
		return this.name;
	}

	@Override
	public int numberOfIndividuals() {
		return this.individuals.size();
	}

	@Override
	public boolean hasIndividuals() {
		return !this.individuals.isEmpty();
	}

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

	@Override
	public Set individualIds() {
		return new LinkedHashSet(this.individuals.keySet());
	}

	@Override
	public boolean hasIndividual(Object id) {
		return this.individuals.containsKey(id);
	}

	@SuppressWarnings("unchecked")
	@Override
	public > S individualOfId(T id) {
		return (S)this.individuals.get(id);
	}

	@Override
	public > S individual(T id, Class clazz) {
		Individual result=individualOfId(id);
		if(result==null) {
			result=factory.newIndividual(clazz,id);
			this.individuals.put(id,result);
		} else if (!clazz.isInstance(result)) {
			throw new IllegalStateException("Existing individual '"+id+"' is not compatible with '"+clazz.getCanonicalName()+"' ("+result.getClass().getCanonicalName()+")");
		}
		return clazz.cast(result);
	}

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

	@Override
	public boolean isEmpty() {
		for(Individual individual:this) {
			for(Property property:individual) {
				if(property.hasValues()) {
					return false;
				}
			}
		}
		return true;
	}

	@Override
	public void remove(final Individual src) {
		if(this!=src.dataSet()) {
			return;
		}
		for(Individual individual:this) {
			for(Property property:individual) {
				for(Value value:property) {
					value.accept(new IndividualRemover(property,src,individual));
				}
			}
		}
		this.individuals.remove(src.id());
	}

	@Override
	public String toString() {
		return FormatUtils.formatDataSet(this);
	}

}