package net.lingala.zip4j;

import net.lingala.zip4j.exception.ZipException;
import net.lingala.zip4j.model.AESExtraDataRecord;
import net.lingala.zip4j.model.FileHeader;
import net.lingala.zip4j.model.ZipParameters;
import net.lingala.zip4j.model.enums.AesKeyStrength;
import net.lingala.zip4j.model.enums.CompressionLevel;
import net.lingala.zip4j.model.enums.CompressionMethod;
import net.lingala.zip4j.model.enums.EncryptionMethod;
import net.lingala.zip4j.testutils.ZipFileVerifier;
import net.lingala.zip4j.util.FileUtils;
import net.lingala.zip4j.util.InternalZipConstants;
import org.assertj.core.data.Offset;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;

import java.io.File;
import java.io.FilenameFilter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import static net.lingala.zip4j.testutils.TestUtils.getTestFileFromResources;
import static net.lingala.zip4j.testutils.ZipFileVerifier.verifyZipFileByExtractingAllFiles;
import static org.assertj.core.api.Assertions.assertThat;

/**
 * Contains Integration tests for create operations of ZipFile
 */
public class CreateZipFileIT extends AbstractIT {

  @Rule
  public ExpectedException expectedException = ExpectedException.none();

  @Test
  public void testCreateSplitZipFileNotSplitArchiveWithZipNameAsString() throws IOException {
    ZipFile zipFile = new ZipFile(generatedZipFile.getPath());
    zipFile.createSplitZipFile(FILES_TO_ADD, new ZipParameters(), false, -1);

    ZipFileVerifier.verifyZipFileByExtractingAllFiles(generatedZipFile, outputFolder, FILES_TO_ADD.size());
  }

  @Test
  public void testCreateSplitZipFileNotSplitArchiveWithZipNameAsStringAndCharsetCp949() throws IOException {
    String koreanFileName = "가나다.abc";
    ZipFile zipFile = new ZipFile(generatedZipFile.getPath());
    List<File> filesToAdd = new ArrayList<>();
    filesToAdd.add(getTestFileFromResources(koreanFileName));

    zipFile.setCharset(CHARSET_CP_949);
    zipFile.createSplitZipFile(filesToAdd, new ZipParameters(), false, -1);

    ZipFileVerifier.verifyZipFileByExtractingAllFiles(generatedZipFile, null, outputFolder, filesToAdd.size(), true, CHARSET_CP_949);
    assertThat(zipFile.getFileHeaders().get(0).getFileName()).isEqualTo(koreanFileName);
  }

  @Test
  public void testCreateSplitZipFileNotSplitArchiveWithZipNameAsStringWithAESEncryption256() throws IOException {
    ZipParameters zipParameters = createZipParameters(EncryptionMethod.AES,
        AesKeyStrength.KEY_STRENGTH_256);
    ZipFile zipFile = new ZipFile(generatedZipFile.getPath(), PASSWORD);
    zipFile.createSplitZipFile(FILES_TO_ADD, zipParameters, false, -1);

    ZipFileVerifier.verifyZipFileByExtractingAllFiles(generatedZipFile, PASSWORD, outputFolder, FILES_TO_ADD.size());
    verifyFileHeadersEncrypted(zipFile.getFileHeaders(), EncryptionMethod.AES, AesKeyStrength.KEY_STRENGTH_256,
        CompressionMethod.DEFLATE);
  }

  @Test
  public void testCreateSplitZipFileNotSplitArchiveWithZipNameAsStringWithAESEncryption128() throws IOException {
    ZipParameters zipParameters = createZipParameters(EncryptionMethod.AES,
        AesKeyStrength.KEY_STRENGTH_128);
    ZipFile zipFile = new ZipFile(generatedZipFile.getPath(), PASSWORD);
    zipFile.createSplitZipFile(FILES_TO_ADD, zipParameters, false, -1);

    ZipFileVerifier.verifyZipFileByExtractingAllFiles(generatedZipFile, PASSWORD, outputFolder, FILES_TO_ADD.size());
    verifyFileHeadersEncrypted(zipFile.getFileHeaders(), EncryptionMethod.AES, AesKeyStrength.KEY_STRENGTH_128,
        CompressionMethod.DEFLATE);
  }

  @Test
  public void testCreateSplitZipFileNotSplitArchiveWithFile() throws IOException {
    ZipFile zipFile = new ZipFile(generatedZipFile);
    zipFile.createSplitZipFile(FILES_TO_ADD, new ZipParameters(), false, -1);

    ZipFileVerifier.verifyZipFileByExtractingAllFiles(generatedZipFile, outputFolder, FILES_TO_ADD.size());
  }

  @Test
  public void testCreateSplitZipFileNotSplitArchiveWithFileAndWithAESEncryption256() throws IOException {
    ZipParameters zipParameters = createZipParameters(EncryptionMethod.AES,
        AesKeyStrength.KEY_STRENGTH_256);
    ZipFile zipFile = new ZipFile(generatedZipFile.getPath(), PASSWORD);
    zipFile.createSplitZipFile(FILES_TO_ADD, zipParameters, false, -1);

    ZipFileVerifier.verifyZipFileByExtractingAllFiles(generatedZipFile, PASSWORD, outputFolder, FILES_TO_ADD.size());
    verifyFileHeadersEncrypted(zipFile.getFileHeaders(), EncryptionMethod.AES, AesKeyStrength.KEY_STRENGTH_256,
        CompressionMethod.DEFLATE);
  }

  @Test
  public void testCreateSplitZipFileNotSplitArchiveWithFileAndWithAESEncryption128() throws IOException {
    ZipParameters zipParameters = createZipParameters(EncryptionMethod.AES,
        AesKeyStrength.KEY_STRENGTH_128);
    ZipFile zipFile = new ZipFile(generatedZipFile.getPath(), PASSWORD);
    zipFile.createSplitZipFile(FILES_TO_ADD, zipParameters, false, -1);

    ZipFileVerifier.verifyZipFileByExtractingAllFiles(generatedZipFile, PASSWORD, outputFolder, FILES_TO_ADD.size());
    verifyFileHeadersEncrypted(zipFile.getFileHeaders(), EncryptionMethod.AES, AesKeyStrength.KEY_STRENGTH_128,
        CompressionMethod.DEFLATE);
  }

  @Test
  public void testCreateSplitZipFileNotSplitArchiveWithFileAndWithStandardEncryption() throws IOException {
    ZipParameters zipParameters = createZipParameters(EncryptionMethod.ZIP_STANDARD,
        AesKeyStrength.KEY_STRENGTH_128);
    ZipFile zipFile = new ZipFile(generatedZipFile.getPath(), PASSWORD);
    zipFile.createSplitZipFile(FILES_TO_ADD, zipParameters, false, -1);

    ZipFileVerifier.verifyZipFileByExtractingAllFiles(generatedZipFile, PASSWORD, outputFolder, FILES_TO_ADD.size());
    verifyFileHeadersEncrypted(zipFile.getFileHeaders(), EncryptionMethod.ZIP_STANDARD, AesKeyStrength.KEY_STRENGTH_128,
        CompressionMethod.DEFLATE);
  }

  @Test
  public void testCreateSplitZipFileThrowsExceptionWhenSplitSizeLessThanMinimumAllowed() throws ZipException {
    expectedException.expectMessage("split length less than minimum allowed split length of "
        + InternalZipConstants.MIN_SPLIT_LENGTH + " Bytes");
    expectedException.expect(ZipException.class);

    ZipFile zipFile = new ZipFile(generatedZipFile);
    zipFile.createSplitZipFile(FILES_TO_ADD, new ZipParameters(), true, InternalZipConstants.MIN_SPLIT_LENGTH - 1);
  }

  @Test
  public void testCreateSplitZipFileStoreAndWithoutEncryption() throws IOException {
    ZipParameters zipParameters = new ZipParameters();
    zipParameters.setCompressionMethod(CompressionMethod.STORE);

    ZipFile zipFile = new ZipFile(generatedZipFile);
    zipFile.createSplitZipFile(FILES_TO_ADD, zipParameters, true, InternalZipConstants.MIN_SPLIT_LENGTH);

    verifyZipFileByExtractingAllFiles(generatedZipFile, outputFolder, FILES_TO_ADD.size());
    verifySplitZip(generatedZipFile, 2, InternalZipConstants.MIN_SPLIT_LENGTH);
  }

  @Test
  public void testCreateSplitZipFileStoreAndStandardZipEncryption() throws IOException {
    ZipParameters zipParameters = createZipParameters(EncryptionMethod.ZIP_STANDARD, null);
    zipParameters.setCompressionMethod(CompressionMethod.STORE);

    ZipFile zipFile = new ZipFile(generatedZipFile, PASSWORD);
    zipFile.createSplitZipFile(FILES_TO_ADD, zipParameters, true, InternalZipConstants.MIN_SPLIT_LENGTH);

    verifyZipFileByExtractingAllFiles(generatedZipFile, PASSWORD, outputFolder, FILES_TO_ADD.size());
    verifySplitZip(generatedZipFile, 2, InternalZipConstants.MIN_SPLIT_LENGTH);
  }

  @Test
  public void testCreateSplitZipFileStoreAndWithAesEncryptionKeyStrength256() throws IOException {
    ZipParameters zipParameters = createZipParameters(EncryptionMethod.AES,
        AesKeyStrength.KEY_STRENGTH_256);
    zipParameters.setCompressionMethod(CompressionMethod.STORE);

    ZipFile zipFile = new ZipFile(generatedZipFile, PASSWORD);
    zipFile.createSplitZipFile(FILES_TO_ADD, zipParameters, true, InternalZipConstants.MIN_SPLIT_LENGTH);

    verifyZipFileByExtractingAllFiles(generatedZipFile, PASSWORD, outputFolder, FILES_TO_ADD.size());
    verifySplitZip(generatedZipFile, 2, InternalZipConstants.MIN_SPLIT_LENGTH);
  }

  @Test
  public void testCreateSplitZipFileStoreAndWithAesEncryptionKeyStrength128() throws IOException {
    ZipParameters zipParameters = createZipParameters(EncryptionMethod.AES,
        AesKeyStrength.KEY_STRENGTH_128);
    zipParameters.setCompressionMethod(CompressionMethod.STORE);

    ZipFile zipFile = new ZipFile(generatedZipFile, PASSWORD);
    List<File> filesToAdd = new ArrayList<>(FILES_TO_ADD);
    filesToAdd.add(getTestFileFromResources("file_PDF_1MB.pdf"));
    zipFile.createSplitZipFile(filesToAdd, zipParameters, true, InternalZipConstants.MIN_SPLIT_LENGTH);

    verifyZipFileByExtractingAllFiles(generatedZipFile, PASSWORD, outputFolder, FILES_TO_ADD.size() + 1);
    verifySplitZip(generatedZipFile, 18, InternalZipConstants.MIN_SPLIT_LENGTH);
  }

  @Test
  public void testCreateSplitZipFileDeflateAndWithoutEncryption() throws IOException {
    ZipFile zipFile = new ZipFile(generatedZipFile);
    List<File> filesToAdd = new ArrayList<>(FILES_TO_ADD);
    filesToAdd.add(getTestFileFromResources("file_PDF_1MB.pdf"));

    zipFile.createSplitZipFile(filesToAdd, new ZipParameters(), true, 716800);

    verifyZipFileByExtractingAllFiles(generatedZipFile, outputFolder, FILES_TO_ADD.size() + 1);
    verifySplitZip(generatedZipFile, 2, InternalZipConstants.MIN_SPLIT_LENGTH);
  }

  @Test
  public void testCreateSplitZipFileDeflateAndStandardZipEncryption() throws IOException {
    ZipParameters zipParameters = createZipParameters(EncryptionMethod.ZIP_STANDARD, null);
    zipParameters.setCompressionMethod(CompressionMethod.DEFLATE);

    ZipFile zipFile = new ZipFile(generatedZipFile, PASSWORD);
    List<File> filesToAdd = new ArrayList<>(FILES_TO_ADD);
    filesToAdd.add(getTestFileFromResources("file_PDF_1MB.pdf"));
    zipFile.createSplitZipFile(filesToAdd, zipParameters, true, 512000);

    verifyZipFileByExtractingAllFiles(generatedZipFile, PASSWORD, outputFolder, FILES_TO_ADD.size() + 1);
    verifySplitZip(generatedZipFile, 2, InternalZipConstants.MIN_SPLIT_LENGTH);
  }

  @Test
  public void testCreateSplitZipFileDeflateAndWithAesEncryptionKeyStrength256() throws IOException {
    ZipParameters zipParameters = createZipParameters(EncryptionMethod.AES,
        AesKeyStrength.KEY_STRENGTH_256);

    ZipFile zipFile = new ZipFile(generatedZipFile, PASSWORD);
    List<File> filesToAdd = new ArrayList<>(FILES_TO_ADD);
    filesToAdd.add(getTestFileFromResources("file_PDF_1MB.pdf"));
    zipFile.createSplitZipFile(filesToAdd, zipParameters, true, InternalZipConstants.MIN_SPLIT_LENGTH);

    verifyZipFileByExtractingAllFiles(generatedZipFile, PASSWORD, outputFolder, FILES_TO_ADD.size() + 1);
    verifySplitZip(generatedZipFile, 15, InternalZipConstants.MIN_SPLIT_LENGTH);
  }

  @Test
  public void testCreateSplitZipFileDeflateAndWithAesEncryptionKeyStrength128() throws IOException {
    ZipParameters zipParameters = createZipParameters(EncryptionMethod.AES,
        AesKeyStrength.KEY_STRENGTH_128);

    ZipFile zipFile = new ZipFile(generatedZipFile, PASSWORD);
    List<File> filesToAdd = new ArrayList<>(FILES_TO_ADD);
    filesToAdd.add(getTestFileFromResources("file_PDF_1MB.pdf"));
    zipFile.createSplitZipFile(filesToAdd, zipParameters, true, InternalZipConstants.MIN_SPLIT_LENGTH + 2000);

    verifyZipFileByExtractingAllFiles(generatedZipFile, PASSWORD, outputFolder, FILES_TO_ADD.size() + 1);
    verifySplitZip(generatedZipFile, 15, InternalZipConstants.MIN_SPLIT_LENGTH + 2000);
  }

  @Test
  public void testCreateZipFileWithSetPasswordSetter() throws IOException {
    ZipParameters zipParameters = createZipParameters(EncryptionMethod.AES, AesKeyStrength.KEY_STRENGTH_128);

    ZipFile zipFile = new ZipFile(generatedZipFile, "WRONG_PASSWORD".toCharArray());
    zipFile.setPassword(PASSWORD);
    zipFile.addFiles(FILES_TO_ADD, zipParameters);

    verifyZipFileByExtractingAllFiles(generatedZipFile, PASSWORD, outputFolder, FILES_TO_ADD.size());
  }

  @Test
  public void testCreateZipFileWithFasterCompressionLevel() throws IOException {
    createZipFileWithCompressionLevel(CompressionLevel.FASTER);
    verifyZipFileByExtractingAllFiles(generatedZipFile, outputFolder, 3);
  }

  @Test
  public void testCreateZipFileWithMediumFastCompressionLevel() throws IOException {
    createZipFileWithCompressionLevel(CompressionLevel.MEDIUM_FAST);
    verifyZipFileByExtractingAllFiles(generatedZipFile, outputFolder, 3);
  }

  @Test
  public void testCreateZipFileWithHigherCompressionLevel() throws IOException {
    createZipFileWithCompressionLevel(CompressionLevel.HIGHER);
    verifyZipFileByExtractingAllFiles(generatedZipFile, outputFolder, 3);
  }

  @Test
  public void testCreateZipFileWithPreUltraCompressionLevel() throws IOException {
    createZipFileWithCompressionLevel(CompressionLevel.PRE_ULTRA);
    verifyZipFileByExtractingAllFiles(generatedZipFile, outputFolder, 3);
  }

  @Test
  public void testCreateZipFileWithDeflateNoCompressionLevel() throws IOException {
    createZipFileWithCompressionLevel(CompressionLevel.NO_COMPRESSION);
    verifyZipFileByExtractingAllFiles(generatedZipFile, outputFolder, 3);
  }

  private void verifySplitZip(File zipFile, int numberOfExpectedSplitFiles, long splitLength) throws ZipException {
    assertNumberOfSplitFile(zipFile, numberOfExpectedSplitFiles);
    assertSplitFileSizes(zipFile, numberOfExpectedSplitFiles, splitLength);

  }

  private void assertSplitFileSizes(File zipFile, int numberOfExpectedSplitFiles, long splitLength) {
    for (int i = 0; i < numberOfExpectedSplitFiles - 2; i++) {
      String zipExtension = ".z0";
      if (i >= 9) {
        zipExtension = ".z";
      }

      String fileNameWithoutExtension = zipFile.getPath().substring(0, zipFile.getPath().lastIndexOf(".zip"));
      File splitZip = new File(fileNameWithoutExtension + zipExtension + (i + 1));
      assertThat(splitZip).exists();

      assertThat(splitZip.length()).isCloseTo(splitLength, Offset.offset(1000L));
    }
  }

  private void assertNumberOfSplitFile(File zipFile, int numberOfExpectedSplitFiles) throws ZipException {
    File[] allSplitFiles = getAllSplitZipFilesInFolder(zipFile.getParentFile(),
        FileUtils.getZipFileNameWithoutExtension(zipFile.getName()));
    assertThat(allSplitFiles.length).as("Number of split files").isEqualTo(numberOfExpectedSplitFiles);
  }

  private void verifyFileHeadersEncrypted(List<FileHeader> fileHeaders, EncryptionMethod encryptionMethod,
                                          AesKeyStrength aesKeyStrength, CompressionMethod compressionMethod) {
    for (FileHeader fileHeader : fileHeaders) {
      if (fileHeader.isDirectory()) {
        assertThat(fileHeader.isEncrypted()).isFalse();
        assertThat(fileHeader.getAesExtraDataRecord()).isNull();
      } else {
        assertThat(fileHeader.isEncrypted()).isTrue();
        assertThat(fileHeader.getEncryptionMethod()).isEqualTo(encryptionMethod);

        if (encryptionMethod == EncryptionMethod.AES) {
          verifyAesExtraDataRecord(fileHeader.getAesExtraDataRecord(), compressionMethod, aesKeyStrength);
        } else {
          assertThat(fileHeader.getAesExtraDataRecord()).isNull();
        }
      }
    }
  }

  private void verifyAesExtraDataRecord(AESExtraDataRecord aesExtraDataRecord, CompressionMethod compressionMethod,
                                        AesKeyStrength aesKeyStrength) {
    assertThat(aesExtraDataRecord).isNotNull();
    assertThat(aesExtraDataRecord.getCompressionMethod()).isEqualTo(compressionMethod);
    assertThat(aesExtraDataRecord.getAesKeyStrength()).isEqualTo(aesKeyStrength);
  }

  private File[] getAllSplitZipFilesInFolder(File folder, final String fileNameWithoutExtension) {
    FilenameFilter filenameFilter = new FilenameFilter() {
      @Override
      public boolean accept(File dir, String name) {
        return name.contains(fileNameWithoutExtension + ".");
      }
    };
    return folder.listFiles(filenameFilter);
  }

  private ZipFile createZipFileWithCompressionLevel(CompressionLevel compressionLevel) throws ZipException {
    ZipFile zipFile = new ZipFile(generatedZipFile);
    ZipParameters zipParameters = new ZipParameters();
    zipParameters.setCompressionLevel(compressionLevel);
    zipFile.addFiles(FILES_TO_ADD, zipParameters);
    return zipFile;
  }
}
