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package com.google.refine.importers;

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

import javax.xml.stream.XMLStreamException;

import org.slf4j.LoggerFactory;
import org.testng.Assert;
import org.testng.annotations.AfterMethod;
import org.testng.annotations.BeforeMethod;
import org.testng.annotations.BeforeTest;
import org.testng.annotations.Test;

import com.google.refine.RefineTest;
import com.google.refine.importers.JsonImporter.JSONTreeReader;
import com.google.refine.importers.XmlImporter.XmlParser;
import com.google.refine.importers.tree.ImportColumn;
import com.google.refine.importers.tree.ImportColumnGroup;
import com.google.refine.importers.tree.ImportParameters;
import com.google.refine.importers.tree.ImportRecord;
import com.google.refine.importers.tree.TreeReader;
import com.google.refine.importers.tree.TreeReaderException;
import com.google.refine.model.Project;
import com.google.refine.model.Row;

public class XmlImportUtilitiesTests extends RefineTest {

    @Override
    @BeforeTest
    public void init() {
        logger = LoggerFactory.getLogger(this.getClass());
    }

    // dependencies
    Project project;
    TreeReader parser;
    ImportColumnGroup columnGroup;
    ImportRecord record;
    ByteArrayInputStream inputStream;

    // System Under Test
    XmlImportUtilitiesStub SUT;

    @BeforeMethod
    public void SetUp() {
        SUT = new XmlImportUtilitiesStub();
        project = new Project();
        columnGroup = new ImportColumnGroup();
        record = new ImportRecord();
    }

    @Override
    @AfterMethod
    public void TearDown() throws IOException {
        SUT = null;
        project = null;
        parser = null;
        columnGroup = null;
        record = null;
        if (inputStream != null) {
            inputStream.close();
        }
        inputStream = null;
    }

    @Test
    public void detectPathFromTagXmlTest() throws TreeReaderException {
        loadData("<?xml version=\"1.0\"?><library><book id=\"1\"><author>author1</author><genre>genre1</genre></book></library>");

        String tag = "library";
        createXmlParser();

        String[] response = XmlImportUtilitiesStub.detectPathFromTag(parser, tag);
        Assert.assertNotNull(response);
        Assert.assertEquals(response.length, 1);
        Assert.assertEquals(response[0], "library");
    }

    @Test
    public void detectPathFromTagWithNestedElementXml() throws TreeReaderException {
        loadData("<?xml version=\"1.0\"?><library><book id=\"1\"><author>author1</author><genre>genre1</genre></book></library>");
        String tag = "book";

        createXmlParser();

        String[] response = XmlImportUtilitiesStub.detectPathFromTag(parser, tag);
        Assert.assertNotNull(response);
        Assert.assertEquals(response.length, 2);
        Assert.assertEquals(response[0], "library");
        Assert.assertEquals(response[1], "book");
    }

    @Test
    public void detectRecordElementXmlTest() {
        loadData("<?xml version=\"1.0\"?><library><book id=\"1\"><author>author1</author><genre>genre1</genre></book></library>");
        createXmlParser();

        String tag = "library";

        List<String> response = new ArrayList<String>();
        try {
            response = SUT.detectRecordElementWrapper(parser, tag);
        } catch (Exception e) {
            Assert.fail(e.getMessage());
        }
        Assert.assertNotNull(response);
        Assert.assertEquals(response.size(), 1);
        Assert.assertEquals(response.get(0), "library");
    }

    @Test
    public void detectRecordElementCanHandleWithNestedElementsXml() {
        loadData("<?xml version=\"1.0\"?><library><book id=\"1\"><author>author1</author><genre>genre1</genre></book></library>");
        createXmlParser();

        String tag = "book";

        List<String> response = new ArrayList<String>();
        try {
            response = SUT.detectRecordElementWrapper(parser, tag);
        } catch (Exception e) {
            Assert.fail(e.getMessage());
        }
        Assert.assertNotNull(response);
        Assert.assertEquals(response.size(), 2);
        Assert.assertEquals(response.get(0), "library");
        Assert.assertEquals(response.get(1), "book");
    }

    @Test
    public void detectRecordElementIsNullForUnfoundTagXml() {
        loadData("<?xml version=\"1.0\"?><library><book id=\"1\"><author>author1</author><genre>genre1</genre></book></library>");
        createXmlParser();

        String tag = "";

        List<String> response = new ArrayList<String>();
        try {
            response = SUT.detectRecordElementWrapper(parser, tag);
        } catch (Exception e) {
            Assert.fail(e.getMessage());
        }
        Assert.assertNull(response);
    }

    @Test
    public void importTreeDataXmlTest() {
        loadSampleXml();

        String[] recordPath = new String[] { "library", "book" };
        try {
            XmlImportUtilitiesStub.importTreeData(createXmlParser(), project, recordPath, columnGroup, -1,
                    false, true, false);
        } catch (Exception e) {
            Assert.fail();
        }

        assertProjectCreated(project, 0, 6);

        Assert.assertEquals(project.rows.get(0).cells.size(), 4);

        Assert.assertEquals(columnGroup.subgroups.size(), 1);
        Assert.assertNotNull(columnGroup.subgroups.get("book"));
        Assert.assertEquals(columnGroup.subgroups.get("book").subgroups.size(), 3);
        Assert.assertNotNull(columnGroup.subgroups.get("book").subgroups.get("author"));
        Assert.assertNotNull(columnGroup.subgroups.get("book").subgroups.get("title"));
        Assert.assertNotNull(columnGroup.subgroups.get("book").subgroups.get("publish_date"));
    }

    /**
     * Test of deprecated method which can go away when it does
     */
    @Test
    public void importTreeDataXmlTestDeprecated() {
        loadSampleXml();

        String[] recordPath = new String[] { "library", "book" };
        try {
            XmlImportUtilitiesStub.importTreeData(createXmlParser(), project, recordPath, columnGroup, -1,
                    new ImportParameters(false, true, false));
        } catch (Exception e) {
            Assert.fail();
        }

        assertProjectCreated(project, 0, 6);

        Assert.assertEquals(project.rows.get(0).cells.size(), 4);

        Assert.assertEquals(columnGroup.subgroups.size(), 1);
        Assert.assertNotNull(columnGroup.subgroups.get("book"));
        Assert.assertEquals(columnGroup.subgroups.get("book").subgroups.size(), 3);
        Assert.assertNotNull(columnGroup.subgroups.get("book").subgroups.get("author"));
        Assert.assertNotNull(columnGroup.subgroups.get("book").subgroups.get("title"));
        Assert.assertNotNull(columnGroup.subgroups.get("book").subgroups.get("publish_date"));
    }

    @Test
    public void importXmlWithVaryingStructureTest() {
        loadData(XmlImporterTests.getSampleWithVaryingStructure());

        String[] recordPath = new String[] { "library", "book" };
        try {
            XmlImportUtilitiesStub.importTreeData(createXmlParser(), project, recordPath, columnGroup, -1,
                    false, true, false);
        } catch (Exception e) {
            Assert.fail();
        }

        assertProjectCreated(project, 0, 6);
        Assert.assertEquals(project.rows.get(0).cells.size(), 4);
        Assert.assertEquals(project.rows.get(5).cells.size(), 5);

        Assert.assertEquals(columnGroup.subgroups.size(), 1);
        Assert.assertEquals(columnGroup.name, "");
        ImportColumnGroup book = columnGroup.subgroups.get("book");
        Assert.assertNotNull(book);
        Assert.assertEquals(book.columns.size(), 1);
        Assert.assertEquals(book.subgroups.size(), 4);
        Assert.assertNotNull(book.subgroups.get("author"));
        Assert.assertEquals(book.subgroups.get("author").columns.size(), 1);
        Assert.assertNotNull(book.subgroups.get("title"));
        Assert.assertNotNull(book.subgroups.get("publish_date"));
        Assert.assertNotNull(book.subgroups.get("genre"));
    }

    /**
     * Test using deprecated method which can go away when it does
     */
    @Test
    public void importXmlWithVaryingStructureTestDeprecated() {
        loadData(XmlImporterTests.getSampleWithVaryingStructure());

        String[] recordPath = new String[] { "library", "book" };
        try {
            XmlImportUtilitiesStub.importTreeData(createXmlParser(), project, recordPath, columnGroup, -1,
                    new ImportParameters(false, true, false));
        } catch (Exception e) {
            Assert.fail();
        }

        assertProjectCreated(project, 0, 6);
        Assert.assertEquals(project.rows.get(0).cells.size(), 4);
        Assert.assertEquals(project.rows.get(5).cells.size(), 5);

        Assert.assertEquals(columnGroup.subgroups.size(), 1);
        Assert.assertEquals(columnGroup.name, "");
        ImportColumnGroup book = columnGroup.subgroups.get("book");
        Assert.assertNotNull(book);
        Assert.assertEquals(book.columns.size(), 1);
        Assert.assertEquals(book.subgroups.size(), 4);
        Assert.assertNotNull(book.subgroups.get("author"));
        Assert.assertEquals(book.subgroups.get("author").columns.size(), 1);
        Assert.assertNotNull(book.subgroups.get("title"));
        Assert.assertNotNull(book.subgroups.get("publish_date"));
        Assert.assertNotNull(book.subgroups.get("genre"));
    }

    @Test
    public void createColumnsFromImportTest() {

        ImportColumnGroup columnGroup = new ImportColumnGroup();
        ImportColumnGroup subGroup = new ImportColumnGroup();
        columnGroup.columns.put("a", new ImportColumn("hello"));
        columnGroup.columns.put("b", new ImportColumn("world"));
        subGroup.columns.put("c", new ImportColumn("foo"));
        subGroup.columns.put("d", new ImportColumn("bar"));
        columnGroup.subgroups.put("e", subGroup);

        XmlImportUtilitiesStub.createColumnsFromImport(project, columnGroup);

        assertProjectCreated(project, 4, 0);
        Assert.assertEquals(project.columnModel.columns.get(0).getName(), "hello");
        Assert.assertEquals(project.columnModel.columns.get(1).getName(), "world");
        Assert.assertEquals(project.columnModel.columns.get(2).getName(), "foo");
        Assert.assertEquals(project.columnModel.columns.get(3).getName(), "bar");
        Assert.assertEquals(project.columnModel.columnGroups.get(0).keyColumnIndex, 2);
        Assert.assertEquals(project.columnModel.columnGroups.get(0).startColumnIndex, 2);
        Assert.assertEquals(project.columnModel.columnGroups.get(0).columnSpan, 2);
    }

    @Test
    public void findRecordTestXml() {
        loadSampleXml();
        createXmlParser();
        ParserSkip();

        String[] recordPath = new String[] { "library", "book" };
        int pathIndex = 0;

        try {
            SUT.findRecordWrapper(project, parser, recordPath, pathIndex, columnGroup, -1,
                    false, false, false);
        } catch (Exception e) {
            Assert.fail();
        }

        assertProjectCreated(project, 0, 6);

        Assert.assertEquals(project.rows.get(0).cells.size(), 4);
        // TODO
    }

    /**
     * Test of deprecated wrapper method which can go away when it does
     */
    @Test
    public void findRecordTestXmlDeprecated() {
        loadSampleXml();
        createXmlParser();
        ParserSkip();

        String[] recordPath = new String[] { "library", "book" };
        int pathIndex = 0;

        try {
            SUT.findRecordWrapper(project, parser, recordPath, pathIndex, columnGroup, -1,
                    new ImportParameters(false, false, false));
        } catch (Exception e) {
            Assert.fail();
        }

        assertProjectCreated(project, 0, 6);

        Assert.assertEquals(project.rows.get(0).cells.size(), 4);
        // TODO
    }

    @Test
    public void processRecordTestXml() {
        loadData("<?xml version=\"1.0\"?><library><book id=\"1\"><author>author1</author><genre>genre1</genre></book></library>");
        createXmlParser();
        ParserSkip();

        try {
            SUT.processRecordWrapper(project, parser, columnGroup, false, false, false);
        } catch (Exception e) {
            Assert.fail();
        }
        Assert.assertNotNull(project.rows);
        Assert.assertEquals(project.rows.size(), 1);
        Row row = project.rows.get(0);
        Assert.assertNotNull(row);
        Assert.assertNotNull(row.getCell(1));
        Assert.assertEquals(row.getCell(1).value, "author1");

    }

    @Test
    public void processRecordTestDuplicateColumnsXml() {
        loadData(
                "<?xml version=\"1.0\"?><library><book id=\"1\"><authors><author>author1</author><author>author2</author></authors><genre>genre1</genre></book></library>");
        createXmlParser();
        ParserSkip();

        try {
            SUT.processRecordWrapper(project, parser, columnGroup, false, false, false);
        } catch (Exception e) {
            Assert.fail();
        }

        Assert.assertNotNull(project.rows);
        Assert.assertEquals(project.rows.size(), 2);

        Row row = project.rows.get(0);
        Assert.assertNotNull(row);
        Assert.assertEquals(row.cells.size(), 3);
        Assert.assertNotNull(row.getCell(1));
        Assert.assertEquals(row.getCell(1).value, "author1");

        row = project.rows.get(1);
        Assert.assertEquals(row.getCell(1).value, "author2");
    }

    @Test
    public void processRecordTestNestedElementXml() {
        loadData(
                "<?xml version=\"1.0\"?><library><book id=\"1\"><author><author-name>author1</author-name><author-dob>a date</author-dob></author><genre>genre1</genre></book></library>");
        createXmlParser();
        ParserSkip();

        try {
            SUT.processRecordWrapper(project, parser, columnGroup, false, false, false);
        } catch (Exception e) {
            Assert.fail();
        }

        Assert.assertNotNull(project.rows);
        Assert.assertEquals(project.rows.size(), 1);
        Row row = project.rows.get(0);
        Assert.assertNotNull(row);
        Assert.assertEquals(row.cells.size(), 4);
        Assert.assertNotNull(row.getCell(1));
        Assert.assertEquals(row.getCell(1).value, "author1");
        Assert.assertNotNull(row.getCell(2));
        Assert.assertEquals(row.getCell(2).value, "a date");
    }

    @Test
    public void processSubRecordTestXml() {
        loadData("<?xml version=\"1.0\"?><library><book id=\"1\"><author>author1</author><genre>genre1</genre></book></library>");
        createXmlParser();
        ParserSkip();

        try {
            SUT.processSubRecordWrapper(project, parser, columnGroup, record, 0,
                    new ImportParameters(false, false, false));
        } catch (Exception e) {
            Assert.fail();
        }

        Assert.assertEquals(columnGroup.subgroups.size(), 1);
        Assert.assertEquals(columnGroup.name, "");

        Assert.assertNotNull(columnGroup.subgroups.get("library"));
        Assert.assertEquals(columnGroup.subgroups.get("library").subgroups.size(), 1);

        ImportColumnGroup book = columnGroup.subgroups.get("library").subgroups.get("book");
        Assert.assertNotNull(book);
        Assert.assertEquals(book.subgroups.size(), 2);
        Assert.assertNotNull(book.subgroups.get("author"));
        Assert.assertNotNull(book.subgroups.get("genre"));

        // TODO check record
    }

    @Test
    public void trimLeadingTrailingWhitespaceOnTrimString() {
        loadData(
                "<?xml version=\"1.0\"?><library><book id=\"1\"><author><author-name>  author1  </author-name><author-dob>  a date  </author-dob></author><genre>genre1</genre></book></library>");
        createXmlParser();
        ParserSkip();

        try {
            SUT.processRecordWrapper(project, parser, columnGroup, true, false, false);
        } catch (Exception e) {
            Assert.fail();
        }

        Assert.assertNotNull(project.rows);
        Assert.assertEquals(project.rows.size(), 1);
        Row row = project.rows.get(0);
        Assert.assertNotNull(row);
        Assert.assertEquals(row.cells.size(), 4);
        Assert.assertNotNull(row.getCell(1));
        Assert.assertEquals(row.getCell(1).value, "author1");
        Assert.assertNotNull(row.getCell(2));
        Assert.assertEquals(row.getCell(2).value, "a date");
    }

    @Test
    public void doesNotTrimLeadingTrailingWhitespaceOnNoTrimString() {
        loadData(
                "<?xml version=\"1.0\"?><library><book id=\"1\"><author><author-name>  author1  </author-name><author-dob>  a date  </author-dob></author><genre>genre1</genre></book></library>");
        createXmlParser();
        ParserSkip();

        try {
            SUT.processRecordWrapper(project, parser, columnGroup, false, false, false);
        } catch (Exception e) {
            Assert.fail();
        }

        Assert.assertNotNull(project.rows);
        Assert.assertEquals(project.rows.size(), 1);
        Row row = project.rows.get(0);
        Assert.assertNotNull(row);
        Assert.assertEquals(row.cells.size(), 4);
        Assert.assertNotNull(row.getCell(1));
        Assert.assertEquals(row.getCell(1).value, "  author1  ");
        Assert.assertNotNull(row.getCell(2));
        Assert.assertEquals(row.getCell(2).value, "  a date  ");
    }

    @Test
    public void addCellTest() {
        String columnLocalName = "author";
        String text = "Author1, The";
        int commonStartingRowIndex = 0;
        SUT.addCellWrapper(project, columnGroup, record, columnLocalName, text, commonStartingRowIndex);

        Assert.assertNotNull(record);
        Assert.assertNotNull(record.rows);
        // Assert.assertNotNull(record.columnEmptyRowIndices);
        Assert.assertEquals(record.rows.size(), 1);
        // Assert.assertEquals(record.columnEmptyRowIndices.size(), 2);
        Assert.assertNotNull(record.rows.get(0));
        // Assert.assertNotNull(record.columnEmptyRowIndices.get(0));
        // Assert.assertNotNull(record.columnEmptyRowIndices.get(1));
        Assert.assertEquals(record.rows.get(0).size(), 1);
        Assert.assertNotNull(record.rows.get(0).get(0));
        Assert.assertEquals(record.rows.get(0).get(0).value, "Author1, The");
        // Assert.assertEquals(record.columnEmptyRowIndices.get(0).intValue(),0);
        // Assert.assertEquals(record.columnEmptyRowIndices.get(1).intValue(),1);

    }

    /**
     * Validates the output records data with Input as Xml containing whitespaces
     * <p>
     * Fix: Issue#1095 :: Open XML file from URL generates lots of empty lines
     */
    @Test
    public void processRecordsFromXmlWithWhiteSpacesBeforeTagsTest() throws IOException {
        loadData(_getXmlDataFromFile("xml-sample-format-1.xml"));
        createXmlParser();
        ParserSkip();
        try {
            SUT.processRecordWrapper(project, parser, columnGroup, false, false, false);
        } catch (Exception e) {
            Assert.fail("Failed to parse records from the given XML Data. Reason: " + e.getMessage(), e);
        }
        Assert.assertNotNull(project.rows, "Checks the record count of project");
        Assert.assertEquals(project.rows.size(), 3, "Checks the number of records parsed from Xml");
        Row row = project.rows.get(0);
        Assert.assertNotNull(row, "Checks the row instance with index '0'");
        Assert.assertEquals(row.cells.size(), 4, "Checks the row cells count");
        Assert.assertNotNull(row.getCell(1), "Checks the cell instance at index '1'");
        Assert.assertEquals(row.getCell(1).value, "author1", "Checks the value for 'author-name'");
        Assert.assertNotNull(row.getCell(2), "Checks the cell instance at index '2'");
        Assert.assertEquals(row.getCell(2).value, "a date", "Checks the value for 'author-dob'");
    }

    @Test
    public void processRecordsFromComplexXmlWithTagsHavingWhitespaces() throws IOException {
        loadData(_getXmlDataFromFile("xml-sample-format-2.xml"));
        createXmlParser();
        ParserSkip();
        try {
            SUT.processRecordWrapper(project, parser, columnGroup, false, false, false);
        } catch (Exception e) {
            Assert.fail("Failed to parse records from the given XML Data. Reason: " + e.getMessage(), e);
        }
        Assert.assertNotNull(project.rows, "Checks the record count of project");
        Assert.assertEquals(project.rows.size(), 3, "Checks the number of records parsed from Xml");
        Row row = project.rows.get(0);
        Assert.assertNotNull(row, "Checks the row instance with index '0'");
        Assert.assertEquals(row.cells.size(), 4, "Checks the row cells count");
        Assert.assertNotNull(row.getCell(1), "Checks the cell instance at index '1'");
        Assert.assertEquals(row.getCell(1).value, "author1", "Checks the value for first item");
        Assert.assertNotNull(row.getCell(2), "Checks the cell instance at index '2'");
        Assert.assertEquals(row.getCell(2).value, "a date", "Checks the value for 'author-dob'");
    }

    @Test
    public void processRecordsFromXMLWithDataHavingWhitespaces() throws IOException {
        loadData(_getXmlDataFromFile("xml-sample-format-3.xml"));
        createXmlParser();
        ParserSkip();
        try {
            SUT.processRecordWrapper(project, parser, columnGroup, false, false, false);
        } catch (Exception e) {
            Assert.fail("Failed to parse records from the given XML Data. Reason: " + e.getMessage(), e);
        }
        Assert.assertNotNull(project.rows, "Checks the record count of project");
        Assert.assertEquals(project.rows.size(), 3, "Checks the number of records parsed from Xml");
        Row row = project.rows.get(0);
        Assert.assertNotNull(row, "Checks the row instance with index '0'");
        Assert.assertEquals(row.cells.size(), 4, "Checks the row cells count");
        Assert.assertNotNull(row.getCell(1), "Checks the cell instance at index '1'");
        Assert.assertEquals(row.getCell(1).value.toString().substring(2, 9), "author1", "Checks the value for first item");
        Assert.assertNotNull(row.getCell(2), "Checks the cell instance at index '2'");
        Assert.assertEquals(row.getCell(2).value.toString().substring(2, 8), "a date", "Checks the value for 'author-dob'");

    }

    @Test
    public void processRecordsFromComplexXmlStructure() throws IOException {
        loadData(_getXmlDataFromFile("xml-sample-format-4.xml"));
        createXmlParser();
        ParserSkip();
        try {
            SUT.processRecordWrapper(project, parser, columnGroup, false, false, false);
        } catch (Exception e) {
            Assert.fail("Failed to parse records from the given XML Data. Reason: " + e.getMessage(), e);
        }
        Assert.assertNotNull(project.rows, "Checks the record count of project");
        Assert.assertEquals(project.rows.size(), 50, "Checks the number of records parsed from Xml");
        Row row = project.rows.get(0);
        Assert.assertNotNull(row, "Checks the row instance with index '0'");
        Assert.assertEquals(row.cells.size(), 14, "Checks the row cells count");
        Assert.assertNotNull(row.getCell(1), "Checks the cell instance at index '1'");
        Assert.assertEquals(row.getCell(1).value, "11", "Checks the value for 'pages'");
        Assert.assertNotNull(row.getCell(2), "Checks the cell instance at index '2'");
        Assert.assertEquals(row.getCell(2).value, "50", "Checks the value for 'per-page'");
    }

    // ----------------helpers-------------
    public void loadSampleXml() {
        loadData(XmlImporterTests.getSample());
    }

    public void loadSampleJson() {
        loadData(JsonImporterTests.getSample());
    }

    public void loadData(String xml) {
        try {
            inputStream = new ByteArrayInputStream(xml.getBytes("UTF-8"));
        } catch (UnsupportedEncodingException e1) {
            Assert.fail();
        }
    }

    public void ParserSkip() {
        try {
            if (parser.current() == TreeReader.Token.Ignorable) {
                parser.next(); // move parser forward once e.g. skip the START_DOCUMENT parser event
            }
        } catch (Exception e1) {
            Assert.fail();
        }
    }

    public TreeReader createXmlParser() {
        try {
            parser = new XmlParser(inputStream);
            return parser;
        } catch (XMLStreamException e) {
            return null;
        } catch (IOException e) {
            return null;
        }
    }

    public TreeReader createJsonParser() {
        parser = new JSONTreeReader(inputStream);
        return parser;
    }

    private String _getXmlDataFromFile(String fileName) throws IOException {
        InputStream in = this.getClass().getClassLoader()
                .getResourceAsStream(fileName);
        String content = org.apache.commons.io.IOUtils.toString(in, "UTF-8");
        return content;
    }
}
