package com.wpc.library.util.common;

import android.graphics.Bitmap;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;
import java.util.List;


/**
 * File Utils
 * <ul>
 * Read or write file
 * <li>{@link #writeFile(String, String, boolean)} write file</li>
 * <li>{@link #writeFile(String, InputStream)} write file</li>
 * </ul>
 * <ul>
 * Operate file
 * <li>{@link #getFileExtension(String)}</li>
 * <li>{@link #getFileName(String)}</li>
 * <li>{@link #getFileNameWithoutExtension(String)}</li>
 * <li>{@link #getFileSize(String)}</li>
 * <li>{@link #deleteFile(String)}</li>
 * <li>{@link #isFileExist(String)}</li>
 * <li>{@link #isFolderExist(String)}</li>
 * <li>{@link #makeFolders(String)}</li>
 * <li>{@link #makeDirs(String)}</li>
 * </ul>
 *
 * @author <a href="http://www.trinea.cn" target="_blank">Trinea</a> 2012-5-12
 */
public class FileUtils {

    public final static String FILE_EXTENSION_SEPARATOR = ".";

    /**
     * read file
     *
     * @param filePath
     * @param charsetName The name of a supported {@link java.nio.charset.Charset
     *                    </code>charset<code>}
     * @return if file not exist, return null, else return content of file
     * @throws IOException if an error occurs while operator BufferedReader
     */
    public static StringBuilder readFile(String filePath, String charsetName) {
        File file = new File(filePath);
        StringBuilder fileContent = new StringBuilder("");
        if (file == null || !file.isFile()) {
            return null;
        }

        BufferedReader reader = null;
        try {
            InputStreamReader is = new InputStreamReader(new FileInputStream(file), charsetName);
            reader = new BufferedReader(is);
            String line = null;
            while ((line = reader.readLine()) != null) {
                if (!fileContent.toString().equals("")) {
                    fileContent.append("\r\n");
                }
                fileContent.append(line);
            }
            reader.close();
            return fileContent;
        } catch (IOException e) {
            throw new RuntimeException("IOException occurred. ", e);
        } finally {
            if (reader != null) {
                try {
                    reader.close();
                } catch (IOException e) {
                    throw new RuntimeException("IOException occurred. ", e);
                }
            }
        }
    }

    /**
     * write file
     *
     * @param filePath
     * @param content
     * @param append   is append, if true, write to the end of file, else clear
     *                 content of file and write into it
     * @return return true
     * @throws IOException if an error occurs while operator FileWriter
     */
    public static boolean writeFile(String filePath, String content, boolean append) {
        FileWriter fileWriter = null;
        try {
            fileWriter = new FileWriter(filePath, append);
            fileWriter.write(content);
            fileWriter.close();
            return true;
        } catch (IOException e) {
            throw new RuntimeException("IOException occurred. ", e);
        } finally {
            if (fileWriter != null) {
                try {
                    fileWriter.close();
                } catch (IOException e) {
                    throw new RuntimeException("IOException occurred. ", e);
                }
            }
        }
    }

    /**
     * write file
     *
     * @param filePath
     * @param stream
     * @return return true
     * @throws IOException if an error occurs while operator FileWriter
     */
    public static boolean writeFile(String filePath, InputStream stream) {
        OutputStream o = null;
        try {
            o = new FileOutputStream(filePath);
            byte data[] = new byte[1024];
            int length = -1;
            while ((length = stream.read(data)) != -1) {
                o.write(data, 0, length);
            }
            o.flush();
            return true;
        } catch (FileNotFoundException e) {
            throw new RuntimeException("FileNotFoundException occurred. ", e);
        } catch (IOException e) {
            throw new RuntimeException("IOException occurred. ", e);
        } finally {
            if (o != null) {
                try {
                    o.close();
                    stream.close();
                } catch (IOException e) {
                    throw new RuntimeException("IOException occurred. ", e);
                }
            }
        }
    }

    /**
     * read file to string list, a element of list is a line
     *
     * @param filePath
     * @param charsetName The name of a supported {@link java.nio.charset.Charset
     *                    </code>charset<code>}
     * @return if file not exist, return null, else return content of file
     * @throws IOException if an error occurs while operator BufferedReader
     */
    public static List<String> readFileToList(String filePath,
                                              String charsetName) {
        File file = new File(filePath);
        List<String> fileContent = new ArrayList<String>();
        if (file == null || !file.isFile()) {
            return null;
        }

        BufferedReader reader = null;
        try {
            InputStreamReader is = new InputStreamReader(new FileInputStream(file), charsetName);
            reader = new BufferedReader(is);
            String line = null;
            while ((line = reader.readLine()) != null) {
                fileContent.add(line);
            }
            reader.close();
            return fileContent;
        } catch (IOException e) {
            throw new RuntimeException("IOException occurred. ", e);
        } finally {
            if (reader != null) {
                try {
                    reader.close();
                } catch (IOException e) {
                    throw new RuntimeException("IOException occurred. ", e);
                }
            }
        }
    }

    /**
     * get file name from path, not include suffix
     *
     * <pre>
     *      getFileNameWithoutExtension(null)               =   null
     *      getFileNameWithoutExtension("")                 =   ""
     *      getFileNameWithoutExtension("   ")              =   "   "
     *      getFileNameWithoutExtension("abc")              =   "abc"
     *      getFileNameWithoutExtension("a.mp3")            =   "a"
     *      getFileNameWithoutExtension("a.b.rmvb")         =   "a.b"
     *      getFileNameWithoutExtension("c:\\")              =   ""
     *      getFileNameWithoutExtension("c:\\a")             =   "a"
     *      getFileNameWithoutExtension("c:\\a.b")           =   "a"
     *      getFileNameWithoutExtension("c:a.txt\\a")        =   "a"
     *      getFileNameWithoutExtension("/home/admin")      =   "admin"
     *      getFileNameWithoutExtension("/home/admin/a.txt/b.mp3")  =   "b"
     * </pre>
     *
     * @param filePath
     * @return file name from path, not include suffix
     * @see
     */
    public static String getFileNameWithoutExtension(String filePath) {
        if (StringUtils.isEmpty(filePath)) {
            return filePath;
        }

        int extenPosi = filePath.lastIndexOf(FILE_EXTENSION_SEPARATOR);
        int filePosi = filePath.lastIndexOf(File.separator);
        if (filePosi == -1) {
            return (extenPosi == -1 ? filePath : filePath.substring(0, extenPosi));
        }
        if (extenPosi == -1) {
            return filePath.substring(filePosi + 1);
        }
        return (filePosi < extenPosi ? filePath.substring(filePosi + 1, extenPosi) : filePath.substring(filePosi + 1));
    }

    /**
     * get file name from path, include suffix
     *
     * <pre>
     *      getFileName(null)               =   null
     *      getFileName("")                 =   ""
     *      getFileName("   ")              =   "   "
     *      getFileName("a.mp3")            =   "a.mp3"
     *      getFileName("a.b.rmvb")         =   "a.b.rmvb"
     *      getFileName("abc")              =   "abc"
     *      getFileName("c:\\")              =   ""
     *      getFileName("c:\\a")             =   "a"
     *      getFileName("c:\\a.b")           =   "a.b"
     *      getFileName("c:a.txt\\a")        =   "a"
     *      getFileName("/home/admin")      =   "admin"
     *      getFileName("/home/admin/a.txt/b.mp3")  =   "b.mp3"
     * </pre>
     *
     * @param filePath
     * @return file name from path, include suffix
     */
    public static String getFileName(String filePath) {
        if (StringUtils.isEmpty(filePath)) {
            return filePath;
        }

        int filePosi = filePath.lastIndexOf(File.separator);
        return (filePosi == -1) ? filePath : filePath.substring(filePosi + 1);
    }

    /**
     * get folder name from path
     *
     * <pre>
     *      getFolderName(null)               =   null
     *      getFolderName("")                 =   ""
     *      getFolderName("   ")              =   ""
     *      getFolderName("a.mp3")            =   ""
     *      getFolderName("a.b.rmvb")         =   ""
     *      getFolderName("abc")              =   ""
     *      getFolderName("c:\\")              =   "c:"
     *      getFolderName("c:\\a")             =   "c:"
     *      getFolderName("c:\\a.b")           =   "c:"
     *      getFolderName("c:a.txt\\a")        =   "c:a.txt"
     *      getFolderName("c:a\\b\\c\\d.txt")    =   "c:a\\b\\c"
     *      getFolderName("/home/admin")      =   "/home"
     *      getFolderName("/home/admin/a.txt/b.mp3")  =   "/home/admin/a.txt"
     * </pre>
     *
     * @param filePath
     * @return
     */
    public static String getFolderName(String filePath) {

        if (StringUtils.isEmpty(filePath)) {
            return filePath;
        }

        int filePosi = filePath.lastIndexOf(File.separator);
        return (filePosi == -1) ? "" : filePath.substring(0, filePosi);
    }

    /**
     * get suffix of file from path
     *
     * <pre>
     *      getFileExtension(null)               =   ""
     *      getFileExtension("")                 =   ""
     *      getFileExtension("   ")              =   "   "
     *      getFileExtension("a.mp3")            =   "mp3"
     *      getFileExtension("a.b.rmvb")         =   "rmvb"
     *      getFileExtension("abc")              =   ""
     *      getFileExtension("c:\\")              =   ""
     *      getFileExtension("c:\\a")             =   ""
     *      getFileExtension("c:\\a.b")           =   "b"
     *      getFileExtension("c:a.txt\\a")        =   ""
     *      getFileExtension("/home/admin")      =   ""
     *      getFileExtension("/home/admin/a.txt/b")  =   ""
     *      getFileExtension("/home/admin/a.txt/b.mp3")  =   "mp3"
     * </pre>
     *
     * @param filePath
     * @return
     */
    public static String getFileExtension(String filePath) {
        if (StringUtils.isBlank(filePath)) {
            return filePath;
        }

        int extenPosi = filePath.lastIndexOf(FILE_EXTENSION_SEPARATOR);
        int filePosi = filePath.lastIndexOf(File.separator);
        if (extenPosi == -1) {
            return "";
        }
        return (filePosi >= extenPosi) ? "" : filePath.substring(extenPosi + 1);
    }

    /**
     * Creates the directory named by the trailing filename of this file,
     * including the complete directory path required to create this directory. <br/>
     * <br/>
     * <ul>
     * <strong>Attentions:</strong>
     * <li>makeDirs("C:\\Users\\Trinea") can only create users folder</li>
     * <li>makeFolder("C:\\Users\\Trinea\\") can create Trinea folder</li>
     * </ul>
     *
     * @param filePath
     * @return true if the necessary directories have been created or the target
     * directory already exists, false one of the directories can not be
     * created.
     * <ul>
     * <li>if {@link FileUtils#getFolderName(String)} return null,
     * return false</li>
     * <li>if target directory already exists, return true</li>
     * </ul>
     */
    public static boolean makeDirs(String filePath) {
        String folderName = getFolderName(filePath);
        if (StringUtils.isEmpty(folderName)) {
            return false;
        }

        File folder = new File(folderName);
        return (folder.exists() && folder.isDirectory()) || folder.mkdirs();
    }

    /**
     * @param filePath
     * @return
     * @see #makeDirs(String)
     */
    public static boolean makeFolders(String filePath) {
        return makeDirs(filePath);
    }

    /**
     * Indicates if this file represents a file on the underlying file system.
     *
     * @param filePath
     * @return
     */
    public static boolean isFileExist(String filePath) {
        if (StringUtils.isBlank(filePath)) {
            return false;
        }

        File file = new File(filePath);
        return (file.exists() && file.isFile());
    }

    /**
     * Indicates if this file represents a directory on the underlying file
     * system.
     *
     * @param directoryPath
     * @return
     */
    public static boolean isFolderExist(String directoryPath) {
        if (StringUtils.isBlank(directoryPath)) {
            return false;
        }

        File dire = new File(directoryPath);
        return (dire.exists() && dire.isDirectory());
    }

    /**
     * delete file or directory
     * <ul>
     * <li>if path is null or empty, return true</li>
     * <li>if path not exist, return true</li>
     * <li>if path exist, delete recursion. return true</li>
     * <ul>
     *
     * @param path
     * @return
     */
    public static boolean deleteFile(String path) {
        if (StringUtils.isBlank(path)) {
            return true;
        }

        File file = new File(path);
        if (!file.exists()) {
            return true;
        }
        if (file.isFile()) {
            return file.delete();
        }

        if (!file.isDirectory()) {
            return false;
        }
        for (File f : file.listFiles()) {
            if (f.isFile()) {
                f.delete();
            } else if (f.isDirectory()) {
                deleteFile(f.getAbsolutePath());
            }
        }
        return file.delete();
    }

    /**
     * get file size
     * <ul>
     * <li>if path is null or empty, return -1</li>
     * <li>if path exist and it is a file, return file size, else return -1</li>
     * <ul>
     *
     * @param path
     * @return
     */
    public static long getFileSize(String path) {
        if (StringUtils.isBlank(path)) {
            return -1;
        }

        File file = new File(path);
        return (file.exists() && file.isFile() ? file.length() : -1);
    }

    /**
     * 文件复制
     *
     * @param src
     * @param dest
     */

    public static void copyFile(File src, File dest) {
        if (!src.exists() || src.length() <= 0)
            return;
        if (!dest.exists())
            try {
                File parent = dest.getParentFile();
                if (!parent.exists())
                    parent.mkdirs();
                dest.createNewFile();
            } catch (Exception e) {
                e.printStackTrace();
            }
        if (dest.exists()) {
            FileInputStream in = null;
            FileOutputStream out = null;
            try {
                in = new FileInputStream(src);
                out = new FileOutputStream(dest);
                byte[] buf = new byte[8 * 1024];
                int len = 0;
                while ((len = in.read(buf)) != -1) {
                    out.write(buf, 0, len);
                    out.flush();
                }
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                try {
                    if (in != null) {
                        in.close();
                    }
                } catch (Exception e) {
                    System.out.println("关闭输入流错误！");
                }
                try {
                    if (out != null) {
                        out.close();
                    }
                } catch (Exception e) {
                    System.out.println("关闭输出流错误！");
                }
            }

        }
    }


    public static void saveBitmap(Bitmap bitmap, String path, String name) throws Exception {
        File dir = new File(path);
        if (!dir.exists())
            dir.mkdirs();
        File file = new File(path + "/" + name);
        if (!file.exists())
            try {
                file.createNewFile();
            } catch (IOException e) {
                e.printStackTrace();
                throw new Exception("文件创建失败");
            }
        try {
            //文件输出流
            FileOutputStream fileOutputStream = new FileOutputStream(file);
            //压缩图片，如果要保存png，就用Bitmap.CompressFormat.PNG，要保存jpg就用Bitmap.CompressFormat.JPEG,质量是100%，表示不压缩
            bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fileOutputStream);
            //写入，这里会卡顿，因为图片较大
            fileOutputStream.flush();
            //记得要关闭写入流
            fileOutputStream.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
            throw new Exception("文件不存在");
        } catch (IOException e) {
            e.printStackTrace();
            throw new Exception("文件保存失败");
        }
    }


    public static String MD5(String filePath) {
        BigInteger bi = null;
        try {
            byte[] buffer = new byte[8192];
            int len = 0;
            MessageDigest md = MessageDigest.getInstance("MD5");
            File f = new File(filePath);
            FileInputStream fis = new FileInputStream(f);
            while ((len = fis.read(buffer)) != -1) {
                md.update(buffer, 0, len);
            }
            fis.close();
            byte[] b = md.digest();
            bi = new BigInteger(1, b);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return bi.toString(16);
    }
}