package io.gisbi.utils;

import io.gisbi.exception.DEException;
import org.springframework.lang.NonNull;
import org.springframework.util.Assert;
import org.springframework.web.multipart.MultipartFile;

import java.io.*;
import java.nio.channels.FileChannel;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

public class FileUtils {

    public static void createIfAbsent(@NonNull Path path) throws IOException {
        Assert.notNull(path, "Path must not be null");

        if (Files.notExists(path)) {
            // Create directories
            Files.createDirectories(path);
            LogUtil.debug("Created directory: [{}]", path);
        }
    }


    /**
     * Java文件操作 获取不带扩展名的文件名
     */
    public static String getFileNameNoEx(String filename) {
        if ((filename != null) && (filename.length() > 0)) {
            int dot = filename.lastIndexOf('.');
            if ((dot > -1) && (dot < (filename.length()))) {
                return filename.substring(0, dot);
            }
        }
        return filename;
    }

    /**
     * 获取文件扩展名，不带 .
     */
    public static String getExtensionName(String filename) {
        if ((filename != null) && (filename.length() > 0)) {
            int dot = filename.lastIndexOf('.');
            if ((dot > -1) && (dot < (filename.length() - 1))) {
                return filename.substring(dot + 1);
            }
        }
        return filename;
    }

    public static void validateExist(String path) {
        File dir = new File(path);
        if (dir.exists()) return;
        dir.mkdirs();
    }

    /**
     * 将文件名解析成文件的上传路径
     */
    public static File upload(MultipartFile file, String filePath) {
        String name = getFileNameNoEx(file.getOriginalFilename());
        String suffix = getExtensionName(file.getOriginalFilename());
        try {
            validateExist(filePath);
            String fileName = name + "." + suffix;
            String path = filePath + fileName;
            // getCanonicalFile 可解析正确各种路径
            File dest = new File(path).getCanonicalFile();

            // 文件写入
            FileOutputStream fileOutputStream = new FileOutputStream(dest);
            fileOutputStream.write(file.getBytes());
            fileOutputStream.flush();
            fileOutputStream.close();
            return dest;
        } catch (Exception e) {
            LogUtil.error(e.getMessage(), e);
        }
        return null;
    }

    public static void copyFolder(String sourcePath, String targetPath) throws Exception {
        //源文件夹路径
        File sourceFile = new File(sourcePath);
        //目标文件夹路径
        File targetFile = new File(targetPath);

        if (!sourceFile.exists()) {
            throw new Exception("文件夹不存在");
        }
        if (!sourceFile.isDirectory()) {
            throw new Exception("源文件夹不是目录");
        }
        if (!targetFile.exists()) {
            targetFile.mkdirs();
        }
        if (!targetFile.isDirectory()) {
            throw new Exception("目标文件夹不是目录");
        }

        File[] files = sourceFile.listFiles();
        if (files == null || files.length == 0) {
            return;
        }

        for (File file : files) {
            //文件要移动的路径
            String movePath = targetFile + File.separator + file.getName();
            if (file.isDirectory()) {
                //如果是目录则递归调用
                copyFolder(file.getAbsolutePath(), movePath);
            } else {
                //如果是文件则复制文件
                BufferedInputStream in = new BufferedInputStream(new FileInputStream(file));
                BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(movePath));

                byte[] b = new byte[1024];
                int temp = 0;
                while ((temp = in.read(b)) != -1) {
                    out.write(b, 0, temp);
                }
                out.close();
                in.close();
            }
        }
    }


    public static String copy(File source, String targetDir) throws IOException {
        String name = source.getName();
        String destPath = null;
        if (targetDir.endsWith("/") || targetDir.endsWith("\\")) {
            destPath = targetDir + name;
        } else {
            destPath = targetDir + "/" + name;
        }
        File DestFile = new File(destPath);
        if (!DestFile.getParentFile().exists()) {
            DestFile.getParentFile().mkdirs();
        }
        copyFileUsingFileChannels(source, DestFile);
        return destPath;
    }

    private static void copyFileUsingFileChannels(File source, File dest) throws IOException {
        FileChannel inputChannel = null;
        FileChannel outputChannel = null;
        try {
            inputChannel = new FileInputStream(source).getChannel();
            outputChannel = new FileOutputStream(dest).getChannel();
            outputChannel.transferFrom(inputChannel, 0, inputChannel.size());
        } finally {
            inputChannel.close();
            outputChannel.close();
        }
    }

    public static String readJson(File file) {
        String str = null;
        try {
            FileReader fileReader = new FileReader(file);
            Reader reader = new InputStreamReader(new FileInputStream(file), "utf-8");
            int ch = 0;
            StringBuffer sb = new StringBuffer();
            while ((ch = reader.read()) != -1) {
                sb.append((char) ch);
            }
            fileReader.close();
            reader.close();
            str = sb.toString();
            return str;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    public static void deleteFile(String path) {
        File file = new File(path);
        if (file.exists()) {
            if (file.isDirectory()) {
                Arrays.stream(file.listFiles()).forEach(item -> deleteFile(item.getAbsolutePath()));
            }
            file.delete();
        }
    }

    public static boolean exist(String path) {
        File file = new File(path);
        return file.exists();
    }

    public static List<String> listFileNames(String path) {
        File file = new File(path);
        if (!file.exists()) {
            return null;
        } else {
            File[] files = file.listFiles();

            assert files != null;

            return Arrays.stream(files).map(File::getName).collect(Collectors.toList());
        }
    }

    public static String getSuffix(String fileName) {
        return fileName.substring(fileName.lastIndexOf(".") + 1);
    }

    public static String getPrefix(String fileName) {
        return fileName.substring(0, fileName.lastIndexOf("."));
    }

    public static byte[] readBytes(String path) {
        File file = new File(path);
        if (!file.exists() || !file.isFile()) {
            DEException.throwException("文件不存在");
        }

        byte[] bytes = null;

        try {
            FileInputStream fis = new FileInputStream(file);

            try {
                ByteArrayOutputStream bos = new ByteArrayOutputStream();

                try {
                    byte[] buffer = new byte[4096];

                    while (true) {
                        int bytesRead;
                        if ((bytesRead = fis.read(buffer)) == -1) {
                            bytes = bos.toByteArray();
                            break;
                        }

                        bos.write(buffer, 0, bytesRead);
                    }
                } catch (Throwable var9) {
                    try {
                        bos.close();
                    } catch (Throwable var8) {
                        var9.addSuppressed(var8);
                    }

                    throw var9;
                }

                bos.close();
            } catch (Throwable var10) {
                try {
                    fis.close();
                } catch (Throwable var7) {
                    var10.addSuppressed(var7);
                }

                throw var10;
            }

            fis.close();
        } catch (Exception var11) {
            var11.printStackTrace();
        }

        return bytes;
    }


    public static boolean deleteDirectoryRecursively(String directoryPath) {
        File directory = new File(directoryPath);
        if (!directory.exists()) {
            return true;
        }

        File[] files = directory.listFiles();
        if (files != null) {
            for (File file : files) {
                if (file.isDirectory()) {
                    deleteDirectoryRecursively(file.getAbsolutePath());
                } else {
                    boolean deletionSuccess = file.delete();
                }
            }
        }
        return directory.delete();
    }
}