package org.yeshi.utils.sms;

/**
 * @author hxh
 * @title: VerifyCodeFactory
 * @description: 验证码工厂
 * @date 2021/11/15 18:47
 */
public class VerifyCodeFactory {

    final static String NUMBERS = "0123456789";

    final static String NUMBERS_UPPER_CASE = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";

    final static String UPPER_CASE = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";

    final static String NUMBERS_LOWER_CASE = "0123456789abcdefghijklmnopqrstuvwxyz";

    final static String LOWER_CASE = "abcdefghijklmnopqrstuvwxyz";

    /**
     * @return java.lang.String
     * @author hxh
     * @description 纯数字验证码
     * @date 18:56 2021/11/15
     * @param: length
     **/
    public static String createNumber(int length) {

        return createCode(length, NUMBERS);
    }

    /**
     * @return java.lang.String
     * @author hxh
     * @description 数字大写字母混合验证码
     * @date 18:56 2021/11/15
     * @param: length
     **/
    public static String createNumberAndUpperCase(int length) {

        return createCode(length, NUMBERS_UPPER_CASE);
    }

    /**
     * @return java.lang.String
     * @author hxh
     * @description 数字小写字母混合验证码
     * @date 18:56 2021/11/15
     * @param: length
     **/
    public static String createNumberAndLowerCase(int length) {

        return createCode(length, NUMBERS_LOWER_CASE);
    }


    /**
     * @return java.lang.String
     * @author hxh
     * @description 纯大写字母混合验证码
     * @date 18:56 2021/11/15
     * @param: length
     **/
    public static String createUpperCase(int length) {

        return createCode(length, UPPER_CASE);
    }

    /**
     * @return java.lang.String
     * @author hxh
     * @description 纯小写字母混合验证码
     * @date 18:56 2021/11/15
     * @param: length
     **/
    public static String createLowerCase(int length) {

        return createCode(length, LOWER_CASE);
    }

    private static String createCode(int length, String source) {
        StringBuffer buffer = new StringBuffer();
        for (int i = 0; i < length; i++) {
            buffer.append(source.charAt((int) (Math.random() * source.length())));
        }
        return buffer.toString();

    }


}