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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 *   or more contributor license agreements.  See the NOTICE file
 *   distributed with this work for additional information
 *   regarding copyright ownership.  The ASF licenses this file
 *   to you 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 org.apache.phoenix.pherf.workload;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.LinkedList;
import java.util.List;

import org.apache.phoenix.pherf.result.file.Extension;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.apache.phoenix.pherf.PherfConstants;
import org.apache.phoenix.pherf.configuration.Query;
import org.apache.phoenix.pherf.util.PhoenixUtil;

import difflib.DiffUtils;
import difflib.Patch;

public class QueryVerifier {
    private PhoenixUtil pUtil = PhoenixUtil.create();
    private static final Logger LOGGER = LoggerFactory.getLogger(QueryVerifier.class);
    private boolean useTemporaryOutput;
    private String directoryLocation;

    public QueryVerifier(boolean useTemporaryOutput) {
        this.useTemporaryOutput = useTemporaryOutput;
        this.directoryLocation =
                this.useTemporaryOutput ? PherfConstants.EXPORT_TMP : PherfConstants.EXPORT_DIR;

        ensureBaseDirExists();
    }

    /**
     * Export query resultSet to CSV file
     *
     * @param query
     * @throws Exception
     */
    public String exportCSV(Query query) throws Exception {
        Connection conn = null;
        PreparedStatement statement = null;
        ResultSet rs = null;
        String fileName = getFileName(query);
        FileOutputStream fos = new FileOutputStream(fileName);
        try {
            conn = pUtil.getConnection(query.getTenantId());
            statement = conn.prepareStatement(query.getStatement());
            boolean isQuery = statement.execute();
            if (isQuery) {
                rs = statement.executeQuery();
                int columnCount = rs.getMetaData().getColumnCount();
                while (rs.next()) {
                    for (int columnNum = 1; columnNum <= columnCount; columnNum++) {
                        fos.write((rs.getString(columnNum) + PherfConstants.RESULT_FILE_DELIMETER)
                                .getBytes());
                    }
                    fos.write(PherfConstants.NEW_LINE.getBytes());
                }
            } else {
                conn.commit();
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (rs != null) rs.close();
            if (statement != null) statement.close();
            if (conn != null) conn.close();
            fos.flush();
            fos.close();
        }
        return fileName;
    }

    /**
     * Do a diff between exported query results and temporary CSV file
     *
     * @param query
     * @param newCSV
     * @return
     */
    public boolean doDiff(Query query, String newCSV) {
        List original = fileToLines(getCSVName(query, PherfConstants.EXPORT_DIR, ""));
        List newLines = fileToLines(newCSV);

        Patch patch = DiffUtils.diff(original, newLines);
        if (patch.getDeltas().isEmpty()) {
            LOGGER.info("Match: " + query.getId() + " with " + newCSV);
            return true;
        } else {
            LOGGER.error("DIFF FAILED: " + query.getId() + " with " + newCSV);
            return false;
        }
    }

    /**
     * Helper method to load file
     *
     * @param filename
     * @return
     */
    private static List fileToLines(String filename) {
        List lines = new LinkedList();
        String line = "";
        try {
            BufferedReader in = new BufferedReader(new FileReader(filename));
            while ((line = in.readLine()) != null) {
                lines.add(line);
            }
            in.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

        return lines;
    }

    /**
     * Helper method to generate CSV file name
     *
     * @param query
     * @return
     * @throws FileNotFoundException
     */
    private String getFileName(Query query) throws FileNotFoundException {
        String tempExt = "";
        if (this.useTemporaryOutput) {
            tempExt = "_" + java.util.UUID.randomUUID().toString();
        }
        return getCSVName(query, this.directoryLocation, tempExt);
    }

    private String getCSVName(Query query, String directory, String tempExt) {
        String
                csvFile =
                directory + PherfConstants.PATH_SEPARATOR + query.getId() + tempExt + Extension.CSV
                        .toString();
        return csvFile;
    }

    private void ensureBaseDirExists() {
        File baseDir = new File(this.directoryLocation);
        if (!baseDir.exists()) {
            baseDir.mkdir();
        }
    }
}