import org.junit.jupiter.api.Test;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;

import static org.junit.jupiter.api.Assertions.*;
import static org.mockito.Mockito.*;
public class DirConverterTest {
    public static final String path_to_test_files = "H:\\Lucja\\itaz\\8\\konwersja-liter\\";

    private DirConverter dirConverter;
    private FileConverter fileConverter;

    DirConverterTest(){
        fileConverter = mock(FileConverter.class);
        dirConverter = new DirConverter(fileConverter);
    }

    private void basicTest(String dir, String extension, int numOfInvocations) throws IOException {
        dirConverter.convertSpecifiedFiles(path_to_test_files + dir + "\\", extension);

        verify(fileConverter, times(numOfInvocations)).convertFileToUpperCase(anyString());
        reset(fileConverter);
    }

    @Test
    void testFindingFiles() {
        File dirPath  = new File("H:\\Lucja\\itaz\\8\\konwersja-liter\\dir\\");
        ArrayList<String> filenames = new ArrayList<>(Arrays.asList("file.txt", "file_special_characters.txt", "file_to_write.txt"));
        assertEquals(filenames, dirConverter.listFileForFolder(dirPath, ".txt"));
    }

    @Test
    void testEmptyDir() throws IOException {
        basicTest("dir_empty", ".txt", 0);
        basicTest("dir_empty", ".java", 0);
        basicTest("dir_empty", ".json", 0);
    }

    @Test
    void testOneJsonFile() throws IOException {
        basicTest("dir", ".json", 1);
    }

    @Test
    void testThreeJavaFiles() throws IOException {
        basicTest("dir", ".java", 2);
    }

    @Test
    void testThreeTxtFiles() throws IOException {
        basicTest("dir", ".txt", 3);
    }
}