package hdgl.util;

        import java.io.File;
        import java.text.SimpleDateFormat;
        import java.util.Date;
        import java.util.regex.Matcher;
        import java.util.regex.Pattern;

/**
 * 字符串的辅助方法
 * @author elm
 *
 */
public class StringHelper {


    /**
     * 不能实例化辅助类
     */
    private StringHelper(){

    }

    /**
     * <p>将字符串编码为文件路径名<p>
     * <p>规则如下：</p>
     * <ul>
     *  <li>以下字符将被原样输出：a-z, A-Z, 0-9, _(下划线), -(减号)</li>
     *  <li>三个分隔线字符: / | \ 将会被转换为平台的路径分隔符，Windows下是'\\', Unix下是'/'</li>
     *  <li>其它字符会被转换为"$xxxx"，其中xxxx是该字符的十六进制Unicode值</li>
     * </ul>
     * @param name
     * @return
     */
    public static String filenameEncode(String name){
        StringBuilder fn=new StringBuilder();
        for(int i=0;i<name.length();i++){
            char c=name.charAt(i);
            if((c>'a'&&c<'z')||(c>'A'&&c<'Z')||(c>'0'&&c<'9')||c=='_'||c=='-'){
                fn.append(c);
            }else if(c=='/'||c=='\\'||c=='|'){
                if(fn.length()>0){
                    fn.append(".d");
                }
                fn.append(File.separatorChar);
            }else{
                int num=(int)c;
                fn.append('$');
                fn.append(String.format("%4x", num));
            }
        }
        fn.append(".k");
        return fn.toString();
    }

    public static String formatTimestamp(long timestamp){
        SimpleDateFormat format=new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
        return format.format(new Date(timestamp));
    }

    public static String makePath(String part1, String part2){
        if(part1.endsWith("/")){
            part1 = part1.substring(0, part1.length() - 1);
        }
        if(part2.startsWith("/")){
            part2 = part2.substring(1);
        }
        return part1+"/"+part2;
    }

    static final Pattern NUM_PATTERN = Pattern.compile(".*?(\\d+)");

    public static int getLastInt(String str){
        Matcher matcher = NUM_PATTERN.matcher(str);
        if(matcher.matches()){
            return Integer.parseInt(matcher.group(1));
        }else{
            throw new NumberFormatException();
        }
    }

    public static String fillToLength(int number)
    {
        String str = String.format("%05d", number);
        return str;
    }

    public static String bytesToString(byte[] value)
    {
        StringBuilder result = new StringBuilder();
        for (int i = 0; i < value.length; i++)
        {
            int tmp = (int)value[i] + 128;
            String str = String.format("%03d", tmp);
            result.append(str);
        }
        return result.toString();
    }

    public static byte[] stringToBytes(String value)
    {
        int len = value.length() / 3;
        byte[] result = new byte[len];
        for (int i = 0; i < len; i++)
        {
            result[i] = (byte)(Integer.parseInt(value.substring(i*3, i*3+3)) - 128);
        }
        return result;
    }

    public static String fillToMakeOrder(String value)
    {
        int pos = value.indexOf(" ");
        int v = Integer.parseInt(value.substring(pos + 1));

        return value.substring(0, pos + 1) + String.format("%011d", v);
    }
}