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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.result.impl;

import org.apache.commons.csv.CSVFormat;
import org.apache.commons.csv.CSVParser;
import org.apache.commons.csv.CSVPrinter;
import org.apache.commons.csv.CSVRecord;
import org.apache.phoenix.pherf.PherfConstants;
import org.apache.phoenix.pherf.result.Result;
import org.apache.phoenix.pherf.result.ResultValue;

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;

public class CSVFileResultHandler extends CSVResultHandler {

    public CSVFileResultHandler() {
        super();
    }

    @Override
    public synchronized void write(Result result) throws IOException{
        util.ensureBaseResultDirExists();
        open(result.getHeader());
        super.write(result);
    }

    public synchronized List read() throws IOException {
        util.ensureBaseResultDirExists();
        File file = new File(resultFileName);
        try (CSVParser parser = CSVParser
                .parse(file, Charset.defaultCharset(), CSVFormat.DEFAULT)) {
            List records = parser.getRecords();
            List results = new ArrayList<>();
            String header = null;
            for (CSVRecord record : records) {

                // First record is the CSV Header
                if (record.getRecordNumber() == 1) {
                    header = record.toString();
                    continue;
                }
                List resultValues = new ArrayList<>();
                for (String val : record.toString().split(PherfConstants.RESULT_FILE_DELIMETER)) {
                    resultValues.add(new ResultValue(val));
                }
                Result result = new Result(resultFileDetails, header, resultValues);
                results.add(result);
            }
            return results;
        }
    }

    @Override
    protected void open(String header) throws IOException {
        // Check if already so we only open one writer
        if (csvPrinter != null) {
            return;
        }
        csvPrinter = new CSVPrinter(new PrintWriter(resultFileName), CSVFormat.DEFAULT);
        Object[] records = header.split(PherfConstants.RESULT_FILE_DELIMETER);
        csvPrinter.printRecord(records);
        isClosed = false;
    }
}