/*
 * 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.nifi.csv;

import org.apache.commons.csv.CSVFormat;
import org.apache.commons.csv.QuoteMode;
import org.apache.nifi.logging.ComponentLog;
import org.apache.nifi.serialization.MalformedRecordException;
import org.apache.nifi.serialization.SimpleRecordSchema;
import org.apache.nifi.serialization.record.Record;
import org.apache.nifi.serialization.record.RecordField;
import org.apache.nifi.serialization.record.RecordFieldType;
import org.apache.nifi.serialization.record.RecordSchema;
import org.junit.Test;
import org.mockito.Mockito;

import com.google.common.base.Throwables;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import static org.hamcrest.CoreMatchers.instanceOf;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertThat;

public class ITApacheCSVRecordReader {

    private final CSVFormat format = CSVFormat.DEFAULT.withFirstRecordAsHeader().withTrim().withQuote('"');

    private List<RecordField> getDefaultFields() {
        return createStringFields(new String[]{"id", "name", "balance", "address", "city", "state", "zipCode", "country"});
    }

    private List<RecordField> createStringFields(String[] fieldNames) {
        final List<RecordField> fields = new ArrayList<>();
        for (final String fieldName : fieldNames) {
            fields.add(new RecordField(fieldName, RecordFieldType.STRING.getDataType()));
        }
        return fields;
    }

    @Test
    public void testParserPerformance() throws IOException, MalformedRecordException {
        // Generates about 130MB of data
        final int NUM_LINES = 2500000;
        StringBuilder sb = new StringBuilder("id,name,balance,address,city,state,zipCode,country\n");
        for (int i = 0; i < NUM_LINES; i++) {
            sb.append("1,John Doe,4750.89D,123 My Street,My City,MS,11111,USA\n");
        }
        final RecordSchema schema = new SimpleRecordSchema(getDefaultFields());

        try (final InputStream bais = new ByteArrayInputStream(sb.toString().getBytes());
             final CSVRecordReader reader = new CSVRecordReader(bais, Mockito.mock(ComponentLog.class), schema, format, true, false,
                     RecordFieldType.DATE.getDefaultFormat(), RecordFieldType.TIME.getDefaultFormat(), RecordFieldType.TIMESTAMP.getDefaultFormat(), "UTF-8")) {

            Record record;
            int numRecords = 0;
            while ((record = reader.nextRecord()) != null) {
                assertNotNull(record);
                numRecords++;
            }
            assertEquals(NUM_LINES, numRecords);
        }
    }

    @Test
    public void testExceptionThrownOnParseProblem() throws IOException, MalformedRecordException {
        CSVFormat csvFormat = CSVFormat.DEFAULT.withFirstRecordAsHeader().withQuoteMode(QuoteMode.ALL).withTrim().withDelimiter(',');
        final int NUM_LINES = 25;
        StringBuilder sb = new StringBuilder("\"id\",\"name\",\"balance\"");
        for (int i = 0; i < NUM_LINES; i++) {
            sb.append(String.format("\"%s\",\"John Doe\",\"4750.89D\"\n", i));
        }
        // cause a parse problem
        sb.append(String.format("\"%s\"dieParser,\"John Doe\",\"4750.89D\"\n", NUM_LINES ));
        sb.append(String.format("\"%s\",\"John Doe\",\"4750.89D\"\n", NUM_LINES + 1));
        final RecordSchema schema = new SimpleRecordSchema(createStringFields(new String[] {"id", "name", "balance"}));

        try (final InputStream bais = new ByteArrayInputStream(sb.toString().getBytes());
             final CSVRecordReader reader = new CSVRecordReader(bais, Mockito.mock(ComponentLog.class), schema, csvFormat, true, false,
                     RecordFieldType.DATE.getDefaultFormat(), RecordFieldType.TIME.getDefaultFormat(), RecordFieldType.TIMESTAMP.getDefaultFormat(), "UTF-8")) {

            while (reader.nextRecord() != null) {}
        } catch (Exception e) {
            assertThat(e, instanceOf(MalformedRecordException.class));
            assertThat(Throwables.getRootCause(e), instanceOf(IOException.class));
        }
    }
}