package de.superx.kettle;

import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNull;

import java.io.File;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import javax.sql.DataSource;

import org.junit.AfterClass;
import org.junit.Test;
import org.pentaho.di.core.KettleEnvironment;
import org.pentaho.di.core.Result;
import org.pentaho.di.core.database.DataSourceProviderFactory;
import org.pentaho.di.core.database.DataSourceProviderInterface;
import org.pentaho.di.core.database.DatabaseMeta;
import org.pentaho.di.core.exception.KettleException;
import org.pentaho.di.core.exception.KettleXMLException;
import org.pentaho.di.core.logging.LogLevel;
import org.pentaho.di.core.parameters.UnknownParamException;
import org.pentaho.di.job.Job;
import org.pentaho.di.job.JobMeta;
import org.pentaho.di.metastore.DatabaseMetaStoreUtil;
import org.pentaho.metastore.api.exceptions.MetaStoreException;
import org.pentaho.metastore.stores.memory.MemoryMetaStore;

import de.superx.db.H2InMemoryCreator;
import de.superx.stat.StatisticsBase;
import de.superx.util.test.KettleH2TestDataSourceProvider;

/**
 * Test that {@code ef070=}∅ {@code for ef069=2 OR ef069=3}
 * 
 * @author hiber
 *
 */
public class StudentOfficialStatisticTestSemesterAbroadBeforeNewEnrolment {

	private static final String SCHEMA_PATH = String.join(File.separator, "test", "resources", "schema_files",
			"student_statistics", "abroad_before_new_enrolment", "schema");
	private static final String VIEWS_PATH = String.join(File.separator, "test", "resources", "schema_files",
			"student_statistics", "abroad_before_new_enrolment", "views");
	private static final String UNLOADS_PATH = String.join(File.separator, "test", "resources", "schema_files",
			"student_statistics", "abroad_before_new_enrolment", "unloads");
    private static final String KETTLE_PLUGIN_DIR = String.join(File.separator, "superx", "WEB-INF", "kettle-plugins");
	private DataSource datasource = null;

	/**
	 * @throws java.lang.Exception
	 */
	private static void createInMemoryTestDb() throws Exception {
		H2InMemoryCreator h2InMemoryCreator = new H2InMemoryCreator();
		String schemaPath = new File(SCHEMA_PATH).getAbsolutePath();
		String viewsPath = new File(VIEWS_PATH).getAbsolutePath();
		String unloadsPath = new File(UNLOADS_PATH).getAbsolutePath();
		h2InMemoryCreator.setSchemaDir(schemaPath).setViewDir(viewsPath).setUnlDir(unloadsPath).setUserName("sa")
				.setTablePattern(
						"(astat_.*|sos_.*|trans_cifx|cif.*|dim_studiengang|hochschulinfo|semester|konstanten|accredited_ects|sx_repository)")
				.setViewPattern("skipeverything");
		h2InMemoryCreator.createH2InMemory();
	}

	@Test
	public void testStudentStatistics() throws Exception {
		createInMemoryTestDb();
		MemoryMetaStore metastore = new MemoryMetaStore();
		initKettleEnvironment(metastore);
		try (Connection conn = this.datasource.getConnection();) {
			// Server.startWebServer(conn);
			Job job = runKettleJob(metastore);
			notifyLoggedErrors(job);
			validateResult(conn);
		}
	}

	private void initKettleEnvironment(MemoryMetaStore metastore) throws KettleException, MetaStoreException {
       	System.setProperty("BI_KETTLE_PLUGIN_BASE_FOLDERS", KETTLE_PLUGIN_DIR);
		KettleEnvironment.init();
		DataSourceProviderInterface providerinterface = new KettleH2TestDataSourceProvider("default", null);
		DataSourceProviderFactory.setDataSourceProviderInterface(providerinterface);
		this.datasource = providerinterface.getNamedDataSource("eduetl");
		DatabaseMeta dbmeta = new DatabaseMeta("eduetl", "POSTGRESQL", "JNDI", null, "eduetl", "1521", null, null);
		DatabaseMetaStoreUtil.createDatabaseElement(metastore, dbmeta);
	}

	private static Job runKettleJob(MemoryMetaStore metastore) throws KettleXMLException, UnknownParamException {
		JobMeta jobMeta = new JobMeta(null,
				"superx/WEB-INF/conf/edustore/db/module/astat/etl/statistik2016/estatistik.kjb", null, metastore, null);
		jobMeta.setParameterValue("lieferung", "1");
		jobMeta.setParameterValue("berichtssemester", "20181");
		jobMeta.setParameterValue("stichtagsart_pruef_vorsem", "6");
		jobMeta.setParameterValue("stichtagsart_pruef_berichtssem", "6");
		jobMeta.setParameterValue("stichtagsart_stud_vorsem", "6");
		jobMeta.setParameterValue("stichtagsart_stud_berichtssem", "6");
		Job job = new Job(null, jobMeta);
		job.setLogLevel(LogLevel.BASIC);
		job.start();
		job.waitUntilFinished();
		return job;
	}

	private static void notifyLoggedErrors(Job job) {
		Result result = job.getResult();
		String log = result.getLogText();
		boolean errorsOccured = log.contains("ERROR");
		assertFalse("Errors where found in kettle log:\n" + log, errorsOccured);
	}

	private static void validateResult(Connection conn) throws SQLException {
		Statement statement = conn.createStatement();

		// check ef070 = null when ef069 = 2
		ResultSet resultSet = statement.executeQuery("SELECT ef069, ef070 FROM " + StatisticsBase.MODULE_PREFIX + "astat WHERE ef069='2'");
		while (resultSet.next()) {
			String ef069 = resultSet.getString("ef069");
			String ef070 = resultSet.getString("ef070");
			assertNotNull("statistic has an entry for ef069=2", ef069);
			assertNull("ef070 is null when ef069=2", ef070);
		}
		// check ef070 = null when ef069 = 3
		resultSet = statement.executeQuery("SELECT ef069, ef070 FROM " + StatisticsBase.MODULE_PREFIX + "astat WHERE ef069 = '3'");
		while (resultSet.next()) {
			String ef069 = resultSet.getString("ef069");
			String ef070 = resultSet.getString("ef070");
			assertNotNull("statistic has an entry for ef069=3", ef069);
			assertNull("ef070 is null when ef069=3", ef070);
		}
	}
    
    @AfterClass
    public static void after() {
        KettleEnvironment.shutdown();
    }

}