package com.hx.util.code;

import com.hx.util.DateUtil;
import com.hx.util.StringUtils;
import org.apache.commons.lang3.RandomStringUtils;

import java.util.Date;
import java.util.Random;

/**生成编号工具
 */
public class NumberTool {

    /**大小写字母*/
    private static final String LETTER_ARR = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
    /**大小写字母和数字*/
    private static final String LETTER_NUMBER = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
    /**小写字母*/
    private static final String LETTER_SMALL = "abcdefghijklmnopqrstuvwxyz";
    /**大写字母*/
    private static final String LETTER_BIG = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";


    /**随机获大写字母组合
     * @param lengrhCount 长度
     * @return
     */
    public static String letterBig(long lengrhCount){
        char[] c = LETTER_BIG.toCharArray();
        Random random = new Random();

        StringBuilder data = new StringBuilder();
        for( int i = 0; i < lengrhCount; i ++) {
            data.append(c[random.nextInt(c.length)]);
        }
        return data.toString();
    }


    /**随机获小写字母组合
     * @param lengrhCount 长度
     * @return
     */
    public static String letterSmall(long lengrhCount){
        char[] c = LETTER_SMALL.toCharArray();
        Random random = new Random();

        StringBuilder data = new StringBuilder();
        for( int i = 0; i < lengrhCount; i ++) {
            data.append(c[random.nextInt(c.length)]);
        }
        return data.toString();
    }


    /**随机获取大小写字母和数字组合
     * @param lengrhCount 长度
     * @return
     */
    public static String letterNumber(long lengrhCount){
        char[] c = LETTER_NUMBER.toCharArray();
        Random random = new Random();

        StringBuilder data = new StringBuilder();
        for( int i = 0; i < lengrhCount; i ++) {
            data.append(c[random.nextInt(c.length)]);
        }
        return data.toString();
    }

    /**随机获取大小写字母组合
     * @param lengrhCount 长度
     * @return
     */
    public static String letterRandom(long lengrhCount){
        char[] c = LETTER_ARR.toCharArray();
        Random random = new Random();

        StringBuilder data = new StringBuilder();
        for( int i = 0; i < lengrhCount; i ++) {
            data.append(c[random.nextInt(c.length)]);
        }
        return data.toString();
    }

    /**随机生成字符串（0-9）
     * @param lengthCount 长度
     * @return
     */
    public static String generateCardNo(long lengthCount) {
        Random r=new Random();
        //定义变长字符串
        StringBuilder str = new StringBuilder();
        for(int i=0;i<lengthCount;i++){
            str.append(r.nextInt(10));
        }
        return str.toString();
    }


}