/*******************************************************************************
 * Copyright (c) 2000, 2017 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.test.internal.performance.results.db;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Timestamp;

import org.eclipse.test.internal.performance.InternalDimensions;
import org.eclipse.test.internal.performance.data.Dim;
import org.eclipse.test.internal.performance.db.SQL;

/**
 * Specific implementation for massive database requests.
 */
public class SQL_Results extends SQL {

private PreparedStatement queryBuildAllScenarios,
	queryBuildScenarios,
	queryScenarioSummaries,
	queryAllComments,
	queryScenariosBuilds,
	queryScenarioDataPoints,
	queryScenarioTimestampDataPoints,
	queryScenarioBuildDataPoints,
	queryDimScalars,
	queryAllVariations;

SQL_Results(Connection con) throws SQLException {
	    super(con);
	    // TODO Auto-generated constructor stub
    }

@Override
protected void dispose() throws SQLException {
	super.dispose();
	if (this.queryBuildScenarios != null)
		this.queryBuildScenarios.close();
	if (this.queryBuildAllScenarios != null)
		this.queryBuildAllScenarios.close();
	if (this.queryScenarioSummaries != null)
		this.queryScenarioSummaries.close();
	if (this.queryAllComments != null)
		this.queryAllComments.close();
	if (this.queryScenariosBuilds != null)
		this.queryScenariosBuilds.close();
	if (this.queryScenarioDataPoints != null)
		this.queryScenarioDataPoints.close();
	if (this.queryDimScalars != null)
		this.queryDimScalars.close();
	if (this.queryAllVariations != null)
		this.queryAllVariations.close();
}

/**
 * Get all comments from database
 *
 * @return A set of the query result
 * @throws SQLException
 */
ResultSet queryAllComments() throws SQLException {
	if (this.queryAllComments == null)
		this.queryAllComments = this.fConnection.prepareStatement("select ID, KIND, TEXT from COMMENT"); //$NON-NLS-1$
	return this.queryAllComments.executeQuery();
}

/**
 * Get all variations from database.
 *
 * @param configPattern The pattern for all the concerned configurations
 * @return A set of the query result
 * @throws SQLException
 */
ResultSet queryAllVariations(String configPattern) throws SQLException {
	long start = System.currentTimeMillis();
	if (DB_Results.DEBUG) DB_Results.DEBUG_WRITER.print("[SQL query (config pattern="+configPattern); //$NON-NLS-1$
	if (this.queryAllVariations == null) {
		this.queryAllVariations = this.fConnection.prepareStatement("select KEYVALPAIRS from VARIATION where KEYVALPAIRS like ? order by KEYVALPAIRS"); //$NON-NLS-1$
	}
	this.queryAllVariations.setString(1, "%"+configPattern+"%"); //$NON-NLS-1$ //$NON-NLS-2$
	ResultSet resultSet =  this.queryAllVariations.executeQuery();
	if (DB_Results.DEBUG) DB_Results.DEBUG_WRITER.print(")=" + (System.currentTimeMillis() - start) + "ms]"); //$NON-NLS-1$ //$NON-NLS-2$
	return resultSet;
}

/**
 * Query all scenarios corresponding to the default scenario pattern
 *
 * @param scenarioPattern The pattern for all the concerned scenarios
 * @return Set of the query result
 * @throws SQLException
 */
ResultSet queryBuildAllScenarios(String scenarioPattern) throws SQLException {
	if (this.queryBuildAllScenarios == null) {
		String statement = "select distinct SCENARIO.ID, SCENARIO.NAME , SCENARIO.SHORT_NAME from SCENARIO where " + //$NON-NLS-1$
			"SCENARIO.NAME LIKE ? " + //$NON-NLS-1$
			"order by SCENARIO.NAME"; //$NON-NLS-1$
		this.queryBuildAllScenarios = this.fConnection.prepareStatement(statement);
	}
	this.queryBuildAllScenarios.setString(1, scenarioPattern);
	return this.queryBuildAllScenarios.executeQuery();
}

/**
 * Query all scenarios corresponding to a given scenario pattern
 * and for a specific build name.
 *
 * @param scenarioPattern The pattern for all the concerned scenarios
 * @param buildName The name of the concerned build
 * @return Set of the query result
 * @throws SQLException
 */
ResultSet queryBuildScenarios(String scenarioPattern, String buildName) throws SQLException {
	if (this.queryBuildScenarios == null) {
		String statement = "select distinct SCENARIO.ID, SCENARIO.NAME , SCENARIO.SHORT_NAME from SCENARIO, SAMPLE, VARIATION where " + //$NON-NLS-1$
			"SAMPLE.VARIATION_ID = VARIATION.ID and VARIATION.KEYVALPAIRS LIKE ? and " + //$NON-NLS-1$
			"SAMPLE.SCENARIO_ID = SCENARIO.ID and SCENARIO.NAME LIKE ? " + //$NON-NLS-1$
			"order by SCENARIO.NAME"; //$NON-NLS-1$
		this.queryBuildScenarios = this.fConnection.prepareStatement(statement);
	}
	this.queryBuildScenarios.setString(1, "|build=" + buildName + '%'); //$NON-NLS-1$
	this.queryBuildScenarios.setString(2, scenarioPattern);
	return this.queryBuildScenarios.executeQuery();
}

/**
 * Query all scalars for a given data point.
 *
 * @param datapointId The id of the data point
 * @return Set of the query result
 * @throws SQLException
 */
ResultSet queryDimScalars(int datapointId) throws SQLException {
	if (this.queryDimScalars == null) {
		StringBuilder buffer = new StringBuilder("select DIM_ID, VALUE from SCALAR where "); //$NON-NLS-1$
		buffer.append("DATAPOINT_ID = ? and "); //$NON-NLS-1$
		Dim[] dimensions = DB_Results.getResultsDimensions();
		int length = dimensions.length;
		for (int i=0; i<length; i++) {
			if (i==0) {
				buffer.append("(");
			} else {
				buffer.append(" or ");
			}
			buffer.append("DIM_ID = ");
			buffer.append(dimensions[i].getId());
		}
		buffer.append(") order by DIM_ID");
		this.queryDimScalars = this.fConnection.prepareStatement(buffer.toString());
	}
	this.queryDimScalars.setInt(1, datapointId);
	return this.queryDimScalars.executeQuery();
}

/**
 * Get all data points for a given scenario and configuration.
 *
 * @param config The name of the concerned configuration
 * @param scenarioID The id of the scenario
 * @param lastBuildName Name of the last build on which data were stored locally
 * @param lastBuildTime Date in ms of the last build on which data were stored locally
 * @return A set of the query result
 * @throws SQLException
 */
ResultSet queryScenarioTimestampDataPoints(String config, int scenarioID, String lastBuildName, long lastBuildTime) throws SQLException {
	if (DB_Results.LOG) DB_Results.LOG_WRITER.starts("		+ SQL query (config="+config+", scenario ID="+scenarioID+", build name="+lastBuildName); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
	if (this.queryScenarioTimestampDataPoints== null) {
		String statement = "select DATAPOINT.ID, DATAPOINT.STEP, VARIATION.KEYVALPAIRS from SAMPLE, DATAPOINT, VARIATION where " + //$NON-NLS-1$
			"SAMPLE.SCENARIO_ID = ? and " + //$NON-NLS-1$
			"DATAPOINT.SAMPLE_ID = SAMPLE.ID and " + //$NON-NLS-1$
			"SAMPLE.STARTTIME > ? and " + //$NON-NLS-1$
			"SAMPLE.VARIATION_ID = VARIATION.ID " + //$NON-NLS-1$
			"ORDER BY DATAPOINT.ID, DATAPOINT.STEP"; //$NON-NLS-1$
		this.queryScenarioTimestampDataPoints = this.fConnection.prepareStatement(statement);
	}
	this.queryScenarioTimestampDataPoints.setInt(1, scenarioID);
	// 10/29/2015, dw. Not sure why this timestamp was set 5 hours in future.
	// UTC? Location of previous performance machines?
	// But, should not be required, AFAIK.
	// Timestamp timestamp = new Timestamp(lastBuildTime+(5*3600L*1000)); // create a time-stamp 5h after the given build time
	Timestamp timestamp = new Timestamp(lastBuildTime);
	this.queryScenarioTimestampDataPoints.setTimestamp(2, timestamp);
	ResultSet resultSet =  this.queryScenarioTimestampDataPoints.executeQuery();
	if (DB_Results.LOG) DB_Results.LOG_WRITER.ends(")"); //$NON-NLS-1$
	return resultSet;
}
ResultSet queryScenarioBuildDataPoints(String config, int scenarioID, String buildName) throws SQLException {
	if (DB_Results.LOG) DB_Results.LOG_WRITER.starts("		+ SQL query (config="+config+", scenario ID="+scenarioID+", build name="+buildName); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
	if (this.queryScenarioBuildDataPoints== null) {
		String statement = "select DATAPOINT.ID, DATAPOINT.STEP, VARIATION.KEYVALPAIRS from SAMPLE, DATAPOINT, VARIATION where " + //$NON-NLS-1$
			"SAMPLE.VARIATION_ID = VARIATION.ID and VARIATION.KEYVALPAIRS LIKE ? and " + //$NON-NLS-1$
			"SAMPLE.SCENARIO_ID = ? and " + //$NON-NLS-1$
			"DATAPOINT.SAMPLE_ID = SAMPLE.ID " + //$NON-NLS-1$
			"ORDER BY DATAPOINT.ID, DATAPOINT.STEP"; //$NON-NLS-1$
		this.queryScenarioBuildDataPoints = this.fConnection.prepareStatement(statement);
	}
	this.queryScenarioBuildDataPoints.setString(1, "|build=" + buildName + '%'); //$NON-NLS-1$
	this.queryScenarioBuildDataPoints.setInt(2, scenarioID);
	ResultSet resultSet =  this.queryScenarioBuildDataPoints.executeQuery();
	if (DB_Results.LOG) DB_Results.LOG_WRITER.ends(")"); //$NON-NLS-1$
	return resultSet;
}

/**
 * Get all data points for a given scenario and configuration.
 *
 * @param config The name of the concerned configuration
 * @param scenarioID The id of the scenario
 * @return A set of the query result
 * @throws SQLException
 */
ResultSet queryScenarioDataPoints(String config, int scenarioID) throws SQLException {
	long start = System.currentTimeMillis();
	if (DB_Results.DEBUG) DB_Results.DEBUG_WRITER.print("[SQL query (config="+config+", scenario ID="+scenarioID); //$NON-NLS-1$ //$NON-NLS-2$
	if (this.queryScenarioDataPoints== null) {
		String statement = "select DATAPOINT.ID, DATAPOINT.STEP, VARIATION.KEYVALPAIRS from VARIATION, SAMPLE, DATAPOINT where " + //$NON-NLS-1$
			"VARIATION.KEYVALPAIRS like ? and SAMPLE.VARIATION_ID = VARIATION.ID and " + //$NON-NLS-1$
			"SAMPLE.SCENARIO_ID = ? and " + //$NON-NLS-1$
			"DATAPOINT.SAMPLE_ID = SAMPLE.ID " + //$NON-NLS-1$
			"ORDER BY DATAPOINT.ID, DATAPOINT.STEP"; //$NON-NLS-1$
		this.queryScenarioDataPoints = this.fConnection.prepareStatement(statement);
	}
	this.queryScenarioDataPoints.setString(1, "%"+config+"%"); //$NON-NLS-1$ //$NON-NLS-2$
	this.queryScenarioDataPoints.setInt(2, scenarioID);
	ResultSet resultSet =  this.queryScenarioDataPoints.executeQuery();
	if (DB_Results.DEBUG) DB_Results.DEBUG_WRITER.print(")=" + (System.currentTimeMillis() - start) + "ms]"); //$NON-NLS-1$ //$NON-NLS-2$
	return resultSet;
}

/**
 * Query all summaries from database for a given scenario,
 * configuration and builds.
 *
 * @param config The name of the concerned configuration
 * @param scenarioID The id of the scenario
 * @param builds The list of builds to get summaries. When <code>null</code>
 * 	summaries for all DB builds will be read.
 *
 * @return Set of the query result
 * @throws SQLException
 */
ResultSet queryScenarioSummaries(int scenarioID, String config, String[] builds) throws SQLException {
	int length = builds==null ? 0 : builds.length;
	String buildPattern;
	switch (length) {
		case 0:
			buildPattern = "%"; //$NON-NLS-1$
			break;
		case 1:
		    if (builds == null) {
		        throw new Error("Impossible for builds to be null at this point. Programming/Compiler error?");
		    }
			buildPattern = builds[0];
			break;
		default:
	        if (builds == null) {
	           throw new RuntimeException("builds unexpectedly null at this point. Programming error?");
	        }
			StringBuilder buffer = new StringBuilder();
			loop: for (int idx=0; idx < builds[0].length(); idx++) {
				char ch = builds[0].charAt(idx);
				for (int i=1; i<length; i++) {
					if (idx == builds[i].length()) {
						break loop;
					}
					if (builds[i].charAt(idx) != ch) {
						buffer.append('_');
						continue loop;
					}
				}
				buffer.append(ch);
			}
			buffer.append("%"); //$NON-NLS-1$
			buildPattern = buffer.toString();
			break;
	}
	if (this.queryScenarioSummaries == null) {
		this.queryScenarioSummaries= this.fConnection.prepareStatement("select KEYVALPAIRS , IS_GLOBAL, COMMENT_ID, DIM_ID from VARIATION, SUMMARYENTRY where " + //$NON-NLS-1$
			"KEYVALPAIRS like ? and " + //$NON-NLS-1$
			"VARIATION_ID = VARIATION.ID and " + //$NON-NLS-1$
			"SCENARIO_ID = ? and " + //$NON-NLS-1$
			"(DIM_ID = "+InternalDimensions.ELAPSED_PROCESS.getId()+" or DIM_ID = 0)" + //$NON-NLS-1$ //$NON-NLS-2$
			" order by VARIATION_ID, DIM_ID"); //$NON-NLS-1$
	}
	this.queryScenarioSummaries.setString(1, "|build="+buildPattern+"||config="+ config + "||jvm=8.0|"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
	this.queryScenarioSummaries.setInt(2, scenarioID);
	return this.queryScenarioSummaries.executeQuery();
}

}