package de.superx.kettle;

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.h2.tools.Server;
import org.junit.AfterClass;
import org.junit.Ignore;
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;
import junit.framework.Assert;

/**
 * @author brummer
 *
 */
public class StudentOfficialStatisticsTest {

    private static final String SCHEMA_PATH = String.join(File.separator, "test", "resources", "schema_files", "student_statistics", "schema");
    private static final String VIEWS_PATH = String.join(File.separator, "test", "resources", "schema_files", "student_statistics", "views");
    private static final String UNLOADS_PATH = String.join(File.separator, "test", "resources", "schema_files", "student_statistics", "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)")
                         .setViewPattern("skipeverything");
        h2InMemoryCreator.createH2InMemory();
    }
    
    @Ignore
    @Test
    public void testStudentStatistics() throws Exception {
        createInMemoryTestDb();
        MemoryMetaStore metastore = new MemoryMetaStore();
        initKettleEnvironment(metastore);
        // attention: it seems that in memory datasource is destroyed by kettle processing if we do not keep an open connection!?
        try ( Connection conn = this.datasource.getConnection(); ) {
//            Job job = runKettleJob(metastore);
//            notifyLoggedErrors(job);
//            validateResult(conn);
            Server.startWebServer(conn); // uncomment for local (e.g. dev env) debugging
        }
    }

    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", "2");
        jobMeta.setParameterValue("stichtagsart_pruef_berichtssem", "4");
        jobMeta.setParameterValue("stichtagsart_stud_vorsem", "6");
        jobMeta.setParameterValue("stichtagsart_stud_berichtssem", "1");
        Job job = new Job(null, jobMeta);
        job.setLogLevel(LogLevel.DETAILED);
        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");
        Assert.assertFalse("Errors where found in kettle log:\n" + log, errorsOccured);
    }

    private static void validateResult(Connection conn) throws SQLException {
        Statement statement = conn.createStatement();
        ResultSet resultSet = statement.executeQuery("select * from " + StatisticsBase.MODULE_PREFIX + "astat");
        resultSet.next();
        String ef007_name = resultSet.getString("ef007");
        String ef023_pruefungBestanden = resultSet.getString("ef023");
        Assert.assertEquals("'ef007' (name) differs from expected value", "Anne", ef007_name);
        Assert.assertEquals("'ef023' (pruefungBestanden) differs from expected value", "0", ef023_pruefungBestanden);
    }
    
    @AfterClass
    public static void after() {
        KettleEnvironment.shutdown();
    }

}