package net.aooms.core.util;

import org.apache.commons.lang.StringUtils;

/**
 * 文件工具类
 * Created by 风象南(yuboon) on 2018/9/7
 */
public class FileUtils {

    public static final String DOT = ".";  
    public static final String SLASH_ONE = "/";  
    public static final String SLASH_TWO = "\\";  

    /** 
     * 获取没有扩展名的文件名 
     *  
     * @param fileName 
     * @return 
     */  
    public static String getWithoutExtension(String fileName) {  
        String ext = StringUtils.substring(fileName, 0,  
                StringUtils.lastIndexOf(fileName, DOT));  
        return StringUtils.trimToEmpty(ext);  
    }  

    /** 
     * 获取扩展名 
     *  
     * @param fileName 
     * @return 
     */  
    public static String getExtension(String fileName) {  
        if (StringUtils.INDEX_NOT_FOUND == StringUtils.indexOf(fileName, DOT))  
            return StringUtils.EMPTY;  
        String ext = StringUtils.substring(fileName,  
                StringUtils.lastIndexOf(fileName, DOT));  
        return StringUtils.trimToEmpty(ext);  
    }  
    
    /** 
     * 获取扩展名 不带点
     *  
     * @param fileName 
     * @return 
     */  
    public static String getExtensionNoDot(String fileName) {  
        if (StringUtils.INDEX_NOT_FOUND == StringUtils.indexOf(fileName, DOT))  
            return StringUtils.EMPTY;  
        String ext = StringUtils.substring(fileName,  
                StringUtils.lastIndexOf(fileName, DOT) + 1);  
        return StringUtils.trimToEmpty(ext);  
    }  

    /** 
     * 判断是否同为扩展名 
     *  
     * @param fileName 
     * @param ext 
     * @return 
     */  
    public static boolean isExtension(String fileName, String ext) {  
        return StringUtils.equalsIgnoreCase(getExtension(fileName), ext);  
    }  

    /** 
     * 判断是否存在扩展名 
     *  
     * @param fileName 
     * @return 
     */  
    public static boolean hasExtension(String fileName) {  
        return !isExtension(fileName, StringUtils.EMPTY);  
    }  

    /** 
     * 得到正确的扩展名 
     *  
     * @param ext 
     * @return 
     */  
    public static String trimExtension(String ext) {  
        return getExtension(DOT + ext);  
    }  

    /** 
     * 向path中填充扩展名(如果没有或不同的话) 
     *  
     * @param fileName 
     * @param ext 
     * @return 
     */  
    public static String fillExtension(String fileName, String ext) {  
        fileName = replacePath(fileName + DOT);  
        ext = trimExtension(ext);  
        if (!hasExtension(fileName)) {  
            return fileName + getExtension(ext);  
        }  
        if (!isExtension(fileName, ext)) {  
            return getWithoutExtension(fileName) + getExtension(ext);  
        }  
        return fileName;  
    }  

    /** 
     * 判断是否是文件PATH 
     *  
     * @param fileName 
     * @return 
     */  
    public static boolean isFile(String fileName) {  
        return hasExtension(fileName);  
    }  

    /** 
     * 判断是否是文件夹PATH 
     *  
     * @param fileName 
     * @return 
     */  
    public static boolean isFolder(String fileName) {  
        return !hasExtension(fileName);  
    }  

    public static String replacePath(String path) {  
        return StringUtils.replace(StringUtils.trimToEmpty(path), SLASH_ONE,SLASH_TWO);    
    }  

    /** 
     * 链接PATH前处理 
     *  
     * @param path 
     * @return 
     */  
    public static String trimLeftPath(String path) {  
        if (isFile(path))  
            return path;  
        path = replacePath(path);  
        String top = StringUtils.left(path, 1);  
        if (StringUtils.equalsIgnoreCase(SLASH_TWO, top))  
            return StringUtils.substring(path, 1);  
        return path;  
    }  

    /** 
     * 链接PATH后处理 
     *  
     * @param path 
     * @return 
     */  
    public static String trimRightPath(String path) {  
        if (isFile(path))  
            return path;  
        path = replacePath(path);  
        String bottom = StringUtils.right(path, 1);  
        if (StringUtils.equalsIgnoreCase(SLASH_TWO, bottom))  
            return StringUtils.substring(path, 0, path.length() - 2);  
        return path + SLASH_TWO;  
    }  

    /** 
     * 链接PATH前后处理，得到准确的链接PATH 
     *  
     * @param path 
     * @return 
     */  
    public static String trimPath(String path) {  
        path = StringUtils.replace(StringUtils.trimToEmpty(path), SLASH_ONE,  
                SLASH_TWO);  
        path = trimLeftPath(path);  
        path = trimRightPath(path);  
        return path;  
    }  

    /** 
     * 通过数组完整链接PATH 
     *  
     * @param paths 
     * @return 
     */  
    public static String bulidFullPath(String... paths) {  
        StringBuffer sb = new StringBuffer();  
        for (String path : paths) {  
            sb.append(trimPath(path));  
        }  
        return sb.toString();  
    }  

}