/*
 * Copyright (c) 2011-2015 EPFL DATA Laboratory
 * Copyright (c) 2014-2015 The Squall Collaboration (see NOTICE)
 *
 * All rights reserved.
 *
 * 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 ch.epfl.data.squall.ewh.components;

import java.util.ArrayList;
import java.util.List;

import org.apache.log4j.Logger;

import backtype.storm.Config;
import backtype.storm.topology.TopologyBuilder;
import ch.epfl.data.squall.components.Component;
import ch.epfl.data.squall.components.DataSourceComponent;
import ch.epfl.data.squall.components.EquiJoinComponent;
import ch.epfl.data.squall.ewh.storm_components.EquiDepthHistogramBolt;
import ch.epfl.data.squall.expressions.ValueExpression;
import ch.epfl.data.squall.operators.ChainOperator;
import ch.epfl.data.squall.operators.Operator;
import ch.epfl.data.squall.operators.ProjectOperator;
import ch.epfl.data.squall.predicates.ComparisonPredicate;
import ch.epfl.data.squall.predicates.Predicate;
import ch.epfl.data.squall.storage.AggregationStore;
import ch.epfl.data.squall.storm_components.synchronization.TopologyKiller;
import ch.epfl.data.squall.types.NumericType;
import ch.epfl.data.squall.types.Type;

// equi-depth histogram on one or both input relations
public class EquiDepthHistogramComponent implements Component {
    private static final long serialVersionUID = 1L;
    private static Logger LOG = Logger.getLogger(EquiJoinComponent.class);

    private final Component _r1, _r2;
    private List<Component> _parents = new ArrayList<Component>();
    private String _componentName;

    private int _numOfLastJoiners;
    private ComparisonPredicate _comparison;
    private NumericType _wrapper;

    public EquiDepthHistogramComponent(Component r1, Component r2,
	    NumericType keyType, ComparisonPredicate comparison,
	    int numOfLastJoiners) {
	_r1 = r1;
	_r2 = r2;
	if (_r1 != null) {
	    _r1.setChild(this);
	    _parents.add(_r1);
	}
	if (_r2 != null) {
	    _r2.setChild(this);
	    _parents.add(_r2);
	}
	_componentName = "SRC_HISTOGRAM";

	_numOfLastJoiners = numOfLastJoiners;
	_comparison = comparison;
	_wrapper = keyType;
    }

    @Override
    public boolean equals(Object obj) {
	if (obj instanceof Component)
	    return _componentName.equals(((Component) obj).getName());
	else
	    return false;
    }

    @Override
    public List<DataSourceComponent> getAncestorDataSources() {
	final List<DataSourceComponent> list = new ArrayList<DataSourceComponent>();
	for (final Component parent : getParents())
	    list.addAll(parent.getAncestorDataSources());
	return list;
    }

    @Override
    public Component getChild() {
	return null;
    }

    @Override
    public String getName() {
	return _componentName;
    }

    @Override
    public Component[] getParents() {
	Component[] parentsArr = new Component[_parents.size()];
	for (int i = 0; i < _parents.size(); i++) {
	    parentsArr[i] = _parents.get(i);
	}
	return parentsArr;
    }

    @Override
    public int hashCode() {
	int hash = 7;
	hash = 37 * hash
		+ (_componentName != null ? _componentName.hashCode() : 0);
	return hash;
    }

    @Override
    public void makeBolts(TopologyBuilder builder, TopologyKiller killer,
	    List<String> allCompNames, Config conf, int hierarchyPosition) {

	new EquiDepthHistogramBolt(_r1, _r2, _componentName, _numOfLastJoiners,
		_wrapper, _comparison, allCompNames, builder, killer, conf);
    }

    // below is not used
    @Override
    public EquiDepthHistogramComponent add(Operator operator) {
	throw new RuntimeException("Should not be here!");
    }

    @Override
    public long getBatchOutputMillis() {
	throw new RuntimeException("Should not be here!");
    }

    @Override
    public ChainOperator getChainOperator() {
	throw new RuntimeException("Should not be here!");
    }

    // from StormEmitter interface
    @Override
    public String[] getEmitterIDs() {
	throw new RuntimeException("Should not be here!");
    }

    @Override
    public List<String> getFullHashList() {
	throw new RuntimeException("Should not be here!");
    }

    @Override
    public List<ValueExpression> getHashExpressions() {
	throw new RuntimeException("Should not be here!");
    }

    @Override
    public List<Integer> getHashIndexes() {
	throw new RuntimeException("Should not be here!");
    }

    @Override
    public String getInfoID() {
	throw new RuntimeException("Should not be here!");
    }

    @Override
    public boolean getPrintOut() {
	throw new RuntimeException("Should not be here!");
    }

    @Override
    public EquiDepthHistogramComponent setBatchOutputMillis(long millis) {
	throw new RuntimeException("Should not be here!");
    }

    @Override
    public void setChild(Component child) {
	throw new RuntimeException("Should not be here!");
    }

    // list of distinct keys, used for direct stream grouping and load-balancing
    // ()
    @Override
    public EquiDepthHistogramComponent setFullHashList(List<String> fullHashList) {
	throw new RuntimeException("Should not be here!");
    }

    @Override
    public EquiDepthHistogramComponent setHashExpressions(
	    List<ValueExpression> hashExpressions) {
	throw new RuntimeException("Should not be here!");
    }

    @Override
    public EquiDepthHistogramComponent setOutputPartKey(
	    List<Integer> hashIndexes) {
	throw new RuntimeException("Should not be here!");
    }

    @Override
    public EquiDepthHistogramComponent setOutputPartKey(int... hashIndexes) {
	throw new RuntimeException("Should not be here!");
    }

    @Override
    public EquiDepthHistogramComponent setPrintOut(boolean printOut) {
	throw new RuntimeException("Should not be here!");
    }

    // Out of the second storage (join of R tuple with S relation)
    public EquiDepthHistogramComponent setSecondPreAggProj(
	    ProjectOperator secondPreAggProj) {
	throw new RuntimeException("Should not be here!");
    }

    public EquiDepthHistogramComponent setSecondPreAggStorage(
	    AggregationStore secondPreAggStorage) {
	throw new RuntimeException("Should not be here!");
    }

    @Override
    public Component setContentSensitiveThetaJoinWrapper(Type wrapper) {
	throw new RuntimeException("Should not be here!");
    }
}