/**
 * 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.metron.parsers.csv;

import static org.hamcrest.CoreMatchers.equalTo;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNull;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTrue;


import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.List;
import org.adrianwalker.multilinestring.Multiline;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.log4j.Level;
import org.apache.metron.common.configuration.SensorParserConfig;
import org.apache.metron.common.utils.JSONUtils;
import org.apache.metron.parsers.interfaces.MessageParser;
import org.apache.metron.test.utils.UnitTestHelper;
import org.json.simple.JSONObject;
import org.junit.jupiter.api.Test;

public class CSVParserTest {
  /**
   {
    "parserClassName" : "org.apache.metron.parsers.csv.CSVParser"
   ,"sensorTopic":"dummy"
   ,"parserConfig":
   {
    "columns" : {
                "col1" : 0
               ," col2" : 1
               ,"col3 " : 2
                 }
   }
   }
   */
  @Multiline
  public static String parserConfig;

  @Test
  public void test() throws IOException {
    CSVParser parser = new CSVParser();

    SensorParserConfig config = JSONUtils.INSTANCE.load(parserConfig, SensorParserConfig.class);
    parser.init();
    parser.configure(config.getParserConfig());
    {
      String line = "#foo,bar,grok";
      assertEquals(0, parser.parse(Bytes.toBytes(line)).size());
    }
    {
      String line = "";
      assertEquals(0, parser.parse(Bytes.toBytes(line)).size());
    }
    {
      String line = "foo,bar,grok";
      List<JSONObject> results = parser.parse(Bytes.toBytes(line));
      assertEquals(1, results.size());
      JSONObject o = results.get(0);
      assertTrue(parser.validate(o));
      assertEquals(5, o.size());
      assertEquals("foo", o.get("col1"));
      assertEquals("bar", o.get("col2"));
      assertEquals("grok", o.get("col3"));
    }
    {
      String line = "\"foo\", \"bar\",\"grok\"";
      List<JSONObject> results = parser.parse(Bytes.toBytes(line));
      assertEquals(1, results.size());
      JSONObject o = results.get(0);
      assertTrue(parser.validate(o));
      assertEquals(5, o.size());
      assertEquals("foo", o.get("col1"));
      assertEquals("bar", o.get("col2"));
      assertEquals("grok", o.get("col3"));
    }
    {
      String line = "foo, bar, grok";
      List<JSONObject> results = parser.parse(Bytes.toBytes(line));
      assertEquals(1, results.size());
      JSONObject o = results.get(0);
      assertTrue(parser.validate(o));
      assertEquals(5, o.size());
      assertEquals("foo", o.get("col1"));
      assertEquals("bar", o.get("col2"));
      assertEquals("grok", o.get("col3"));
    }
    {
      String line = " foo , bar , grok ";
      List<JSONObject> results = parser.parse(Bytes.toBytes(line));
      assertEquals(1, results.size());
      JSONObject o = results.get(0);
      assertTrue(parser.validate(o));
      assertEquals(5, o.size());
      assertEquals("foo", o.get("col1"));
      assertEquals("bar", o.get("col2"));
      assertEquals("grok", o.get("col3"));
      assertNull(o.get(" col2"));
      assertNull(o.get("col3 "));
    }
    {
      UnitTestHelper.setLog4jLevel(CSVParser.class, Level.FATAL);
      String line = "foo";
      assertThrows(IllegalStateException.class, () -> parser.parse(Bytes.toBytes(line)));
      UnitTestHelper.setLog4jLevel(CSVParser.class, Level.ERROR);
    }
  }

  @Test
  public void getsReadCharsetFromConfig() throws IOException {
    SensorParserConfig config = JSONUtils.INSTANCE.load(parserConfig, SensorParserConfig.class);
    CSVParser parser = new CSVParser();
    parser.init();
    config.getParserConfig().put(MessageParser.READ_CHARSET, StandardCharsets.UTF_16.toString());
    parser.configure(config.getParserConfig());
    assertThat(parser.getReadCharset(), equalTo(StandardCharsets.UTF_16));
  }

  @Test
  public void getsReadCharsetFromDefault() throws IOException {
    SensorParserConfig config = JSONUtils.INSTANCE.load(parserConfig, SensorParserConfig.class);
    CSVParser parser = new CSVParser();
    parser.init();
    parser.configure(config.getParserConfig());
    assertThat(parser.getReadCharset(), equalTo(StandardCharsets.UTF_8));
  }
}