/*
 * 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.examples.imperative.theta;

import java.util.Arrays;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
import java.util.Map;

import org.apache.log4j.Logger;

import ch.epfl.data.squall.components.Component;
import ch.epfl.data.squall.components.DataSourceComponent;
import ch.epfl.data.squall.components.OperatorComponent;
import ch.epfl.data.squall.components.theta.ThetaJoinComponentFactory;
import ch.epfl.data.squall.expressions.ColumnReference;
import ch.epfl.data.squall.expressions.DateSum;
import ch.epfl.data.squall.expressions.ValueExpression;
import ch.epfl.data.squall.expressions.ValueSpecification;
import ch.epfl.data.squall.operators.AggregateCountOperator;
import ch.epfl.data.squall.operators.AggregateOperator;
import ch.epfl.data.squall.operators.DistinctOperator;
import ch.epfl.data.squall.operators.ProjectOperator;
import ch.epfl.data.squall.operators.SelectOperator;
import ch.epfl.data.squall.predicates.BetweenPredicate;
import ch.epfl.data.squall.predicates.ComparisonPredicate;
import ch.epfl.data.squall.query_plans.QueryBuilder;
import ch.epfl.data.squall.query_plans.QueryPlan;
import ch.epfl.data.squall.query_plans.ThetaQueryPlansParameters;
import ch.epfl.data.squall.types.DateType;
import ch.epfl.data.squall.types.IntegerType;
import ch.epfl.data.squall.types.Type;

public class ThetaTPCH4Plan extends QueryPlan {
    private static void computeDates() {
	// date2= date1 + 3 months
	String date1Str = "1993-07-01";
	int interval = 3;
	int unit = Calendar.MONTH;

	// setting _date1
	_date1 = _dc.fromString(date1Str);

	// setting _date2
	ValueExpression<Date> date1Ve, date2Ve;
	date1Ve = new ValueSpecification<Date>(_dc, _date1);
	date2Ve = new DateSum(date1Ve, unit, interval);
	_date2 = date2Ve.eval(null);
	// tuple is set to null since we are computing based on constants
    }

    private static Logger LOG = Logger.getLogger(ThetaTPCH4Plan.class);
    private static final Type<Date> _dc = new DateType();
    private static final IntegerType _ic = new IntegerType();

    private QueryBuilder _queryBuilder = new QueryBuilder();

    // query variables
    private static Date _date1, _date2;

    public ThetaTPCH4Plan(String dataPath, String extension, Map conf) {
	computeDates();

	int Theta_JoinType = ThetaQueryPlansParameters.getThetaJoinType(conf);
	// -------------------------------------------------------------------------------------
	List<Integer> hashOrders = Arrays.asList(0);

	SelectOperator selectionOrders = new SelectOperator(
		new BetweenPredicate(new ColumnReference(_dc, 4), true,
			new ValueSpecification(_dc, _date1), false,
			new ValueSpecification(_dc, _date2)));

	ProjectOperator projectionOrders = new ProjectOperator(
		new int[] { 0, 5 });

	DataSourceComponent relationOrders = new DataSourceComponent("ORDERS",
		dataPath + "orders" + extension).setOutputPartKey(hashOrders)
		.add(selectionOrders).add(projectionOrders);
	_queryBuilder.add(relationOrders);

	// -------------------------------------------------------------------------------------
	List<Integer> hashLineitem = Arrays.asList(0);

	SelectOperator selectionLineitem = new SelectOperator(
		new ComparisonPredicate(ComparisonPredicate.LESS_OP,
			new ColumnReference(_dc, 11), new ColumnReference(_dc,
				12)));

	DistinctOperator distinctLineitem = new DistinctOperator(conf,
		new int[] { 0 });

	DataSourceComponent relationLineitem = new DataSourceComponent(
		"LINEITEM", dataPath + "lineitem" + extension)
		.setOutputPartKey(hashLineitem).add(selectionLineitem)
		.add(distinctLineitem);
	_queryBuilder.add(relationLineitem);

	// -------------------------------------------------------------------------------------

	ColumnReference colO = new ColumnReference(_ic, 0);
	ColumnReference colL = new ColumnReference(_ic, 0);
	ComparisonPredicate O_L_comp = new ComparisonPredicate(
		ComparisonPredicate.EQUAL_OP, colO, colL);

	Component O_Ljoin = ThetaJoinComponentFactory
		.createThetaJoinOperator(Theta_JoinType, relationOrders,
			relationLineitem, _queryBuilder)
		.setOutputPartKey(Arrays.asList(1)).setJoinPredicate(O_L_comp);

	// -------------------------------------------------------------------------------------
	// set up aggregation function on a separate StormComponent(Bolt)
	AggregateOperator aggOp = new AggregateCountOperator(conf)
		.setGroupByColumns(Arrays.asList(1));
	OperatorComponent finalComponent = new OperatorComponent(O_Ljoin,
		"FINAL_RESULT").add(aggOp);
	_queryBuilder.add(finalComponent);

	// -------------------------------------------------------------------------------------

    }

    @Override
    public QueryBuilder getQueryPlan() {
	return _queryBuilder;
    }
}