package com.kf5.sdk.system.utils;

import java.io.File;
import java.io.FileInputStream;
import java.text.DecimalFormat;

/**
 * author:chosen
 * date:2016/10/18 10:50
 * email:812219713@qq.com
 */

public class FileSizeUtil {

    public static final int SIZETYPE_B = 1;//Bֵ
    public static final int SIZETYPE_KB = 2;//KB
    public static final int SIZETYPE_MB = 3;//MB
    public static final int SIZETYPE_GB = 4;//GB

    /**
     * @param filePath
     * @param sizeType
     * @return
     */
    public static double getFileOrFilesSize(String filePath,int sizeType){
        File file=new File(filePath);
        long blockSize=0;
        try {
            if(file.isDirectory()){
                blockSize = getFileSizes(file);
            }else{
                blockSize = getFileSize(file);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return FormetFileSize(blockSize, sizeType);
    }

    /**
     * @param filePath
     * @return
     */
    public static String getAutoFileOrFilesSize(String filePath){
        File file=new File(filePath);
        long blockSize=0;
        try {
            if(file.isDirectory()){
                blockSize = getFileSizes(file);
            }else{
                blockSize = getFileSize(file);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return FormetFileSize(blockSize);
    }

    /**
     * @param file
     * @return
     * @throws Exception
     */
    @SuppressWarnings("resource")
    private static long getFileSize(File file) throws Exception
    {
        long size = 0;
        if (file.exists()){
            FileInputStream fis = new FileInputStream(file);
            size = fis.available();
        }
//        else{
//            file.createNewFile();
//        }
        return size;
    }

    /**
     * @param f
     * @return
     * @throws Exception
     */
    private static long getFileSizes(File f) throws Exception
    {
        long size = 0;
        File flist[] = f.listFiles();
        for (int i = 0; i < flist.length; i++){
            if (flist[i].isDirectory()){
                size = size + getFileSizes(flist[i]);
            }
            else{
                size =size + getFileSize(flist[i]);
            }
        }
        return size;
    }

    /**
     * @param fileS
     * @return
     */
    public static String FormetFileSize(long fileS)
    {
        DecimalFormat df = new DecimalFormat("#.00");
        String fileSizeString = "";
        String wrongSize="0B";
        if(fileS==0){
            return wrongSize;
        }
        if (fileS < 1024){
            fileSizeString = df.format((double) fileS) + "B";
        }
        else if (fileS < 1048576){
            fileSizeString = df.format((double) fileS / 1024) + "KB";
        }
        else if (fileS < 1073741824){
            fileSizeString = df.format((double) fileS / 1048576) + "MB";
        }
        else{
            fileSizeString = df.format((double) fileS / 1073741824) + "GB";
        }
        return fileSizeString;
    }

    /**
     * @param fileS
     * @param sizeType
     * @return
     */
    private static double FormetFileSize(long fileS,int sizeType)
    {
        DecimalFormat df = new DecimalFormat("#.00");
        double fileSizeLong = 0;
        switch (sizeType) {
            case SIZETYPE_B:
                fileSizeLong=Double.valueOf(df.format((double) fileS));
                break;
            case SIZETYPE_KB:
                fileSizeLong=Double.valueOf(df.format((double) fileS / 1024));
                break;
            case SIZETYPE_MB:
                fileSizeLong=Double.valueOf(df.format((double) fileS / 1048576));
                break;
            case SIZETYPE_GB:
                fileSizeLong=Double.valueOf(df.format((double) fileS / 1073741824));
                break;
            default:
                break;
        }
        return fileSizeLong;
    }
}