package gtPlusPlus.core.util.data;

import java.io.File;
import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardOpenOption;
import java.util.ArrayList;
import java.util.List;

import gtPlusPlus.api.objects.Logger;
import gtPlusPlus.core.util.Utils;

public class FileUtils {

    private static final Charset utf8 = StandardCharsets.UTF_8;

    public static boolean doesFileExist(File f) {
        return f != null && f.exists() && !f.isDirectory();
    }

    public static File createFile(String path, String filename, String extension) {
        File file = new File(Utils.getMcDir(), path + filename + extension);
        return createFile(file);
    }

    public static File createFile(File aFile) {
        boolean blnCreated = false;
        Logger.INFO("Trying to use path " + aFile.getPath());
        try {
            Logger.INFO("Trying to use path " + aFile.getCanonicalPath());
            Logger.INFO("Trying to use absolute path " + aFile.getAbsolutePath());
            blnCreated = aFile.createNewFile();
        } catch (IOException ioe) {
            Logger.INFO("Error while creating a new empty file :" + ioe);
            return null;
        }
        return blnCreated ? aFile : null;
    }

    public static File getFile(String filename, String extension) {
        return getFile("", filename, extension);
    }

    public static File getFile(String path, String filename, String extension) {
        if (path == null || path.length() <= 0) {
            path = "";
        } else {
            path = path + "/";
        }
        if (filename == null || filename.length() <= 0) {
            return null;
        }
        if (extension == null || extension.length() <= 0) {
            extension = ".txt";
        } else {
            extension = "." + extension;
        }
        File file = new File(Utils.getMcDir(), path + filename + extension);
        boolean doesExist = doesFileExist(file);

        if (doesExist) {
            Logger.INFO("Found File: " + file.getAbsolutePath());
            return file;
        } else {
            Logger.INFO("Creating file, as it was not found.");
            return createFile(path, filename, extension);
        }
    }

    public static void appendListToFile(File file, List<String> content) {
        try {
            long oldSize;
            long newSize;
            if (doesFileExist(file)) {
                Path p = Paths.get(file.getPath());
                if (p != null && Files.isWritable(p)) {
                    oldSize = Files.size(p);
                    try {
                        Files.write(p, content, utf8, StandardOpenOption.APPEND);
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                    newSize = Files.size(p);
                }
            }
        } catch (IOException ignored) {}
    }

    /**
     * Reads the contents of a file line by line to a List of Strings using the default encoding for the VM. The file is
     * always closed.
     *
     * @param file the file to read, must not be {@code null}
     * @return the list of Strings representing each line in the file, never {@code null}
     * @throws IOException in case of an I/O error
     * @since 1.3
     */
    public static List<String> readLines(File file) {
        try {
            return org.apache.commons.io.FileUtils.readLines(file, utf8);
        } catch (IOException e) {
            return new ArrayList<>();
        }
    }
}