package org.onap.vid.services;

import org.apache.commons.io.IOUtils;
import org.json.JSONObject;
import org.skyscreamer.jsonassert.JSONAssert;
import org.skyscreamer.jsonassert.JSONCompareMode;
import org.testng.Assert;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;

import javax.ws.rs.BadRequestException;
import java.io.IOException;
import java.lang.reflect.Method;
import java.net.URL;
import java.net.URLDecoder;
import java.util.List;

public class CsvServiceTest {

    private CsvServiceImpl csvService = new CsvServiceImpl();
    private final static String CSV_FOLDER = "csv_files/{CSV_FILE}";
    private final static String VALID_CSV = "csv_to_json.csv";
    private final static String ONE_LINE_CSV = "one_line.csv";
    private final static String EMPTY_CSV = "empty_file.csv";
    private final static String MISSING_CONTENT_CSV = "missing_content.csv";
    private final static String MISSING_VALUES_CSV = "missing_values.csv";



    @Test
    public void parseValidCsv() throws IllegalAccessException, IOException, InstantiationException {
        String expectedJson = getExpectation("vnfConfigUpdatePayload.json");
        readAndParse(VALID_CSV,16,expectedJson);

    }

    private String getExpectation(String modelFileName) throws IOException {
        // load expected result
        final URL resource = this.getClass().getResource("/" + modelFileName);
        String expected = IOUtils.toString(resource, "UTF-8");
        return expected;
    }

    @Test
    public void parseOneLineCsv() throws IllegalAccessException, IOException, InstantiationException {
        String expectedJson ="{\"payload\":{\"request-parameters\":{\"vnf-name\":\"ibcx0099v\"}}}";
        readAndParse(ONE_LINE_CSV,1,expectedJson);
    }

    @DataProvider
    public static Object[][] invalidFiles(Method test) {
        return new Object[][]{
                {MISSING_CONTENT_CSV}, {MISSING_VALUES_CSV}
        };
    }

    @Test(dataProvider = "invalidFiles", expectedExceptions = {BadRequestException.class}, expectedExceptionsMessageRegExp = "Invalid csv file")
    public void parseMissingContentCsv(String invalidFile) throws IllegalAccessException, IOException, InstantiationException {
        readAndParse(invalidFile, 2, null);
    }


    @Test
    public void parseEmptyCsv() throws IllegalAccessException, IOException, InstantiationException {
        String expectedJson ="{}";
        readAndParse(EMPTY_CSV,0,expectedJson);
    }

    private void readAndParse(String fileName, int expectedNumRows, String expectedJson) throws IllegalAccessException, IOException, InstantiationException {
        final URL resource = CsvServiceTest.class.getClassLoader().getResource(CSV_FOLDER.replaceFirst("\\{CSV_FILE\\}", fileName));
        Assert.assertNotNull(resource, "The csv file was not found");
        //using URLDecoder.decode to convert special characters from %XX to real character
        //see https://stackoverflow.com/questions/32251251/java-classloader-getresource-with-special-characters-in-path
        List<String[]> content = csvService.readCsv(URLDecoder.decode(resource.getPath(), "UTF-8"));
        Assert.assertEquals(content.size(), expectedNumRows, "The number of non-empty lines in file is wrong");
        JSONObject json = csvService.convertCsvToJson (content);
        JSONAssert.assertEquals(expectedJson, json, JSONCompareMode.STRICT);

    }


}