package com.lunhan.xxx.common.util;

import java.util.Random;

/**
 * 随机验证码 工具类
 */
public final class RandVerifyCode {
    public static final Integer USE_ZERO = 1;
    public static final Integer USE_O = 2;
    public static final Integer USE_ONE = 1;
    public static final Integer USE_I = 2;

    static char[] arrayCharCode = new char[] { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z' };
    static char[] arrayComplexCode = new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z' };

    private RandVerifyCode() {
        throw new IllegalStateException("Utility class");
    }

    /**
     * 生成随机数字
     * @param length 生成长度
     */
    public static String numberCode(int length) {
        try {
            Thread.sleep(Long.valueOf("1"));
        } catch (Exception e) {
            e.getStackTrace();
        }
        Random random = new Random(CalendarUtil.nowTimestamp());

        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < length; i++) {
            try {
                Thread.sleep(Long.valueOf("1"));
            } catch (Exception e) {}
            sb.append(random.nextInt(Integer.valueOf("10")));
        }
        return sb.toString();
    }

    /**
     * 生成随机字母与数字
     * @param length 生成长度
     */
    public static String complexCode(int length) {
        return complexCode(length, 2, 2);
    }

    /**
     * 生成随机字母与数字
     * @param length 生成长度
     * @param zeroOrO 为避免视觉歧义，数字零“0”和字母欧“O”如何取舍。取数字零=1,取字母欧=2
     * @param oneOrI 为避免视觉歧义，数字一“1”和字母艾“I”如何取舍。取数字一=1,取字母艾=2
     */
    public static String complexCode(int length, Integer zeroOrO, Integer oneOrI) {
        int n = arrayComplexCode.length;
        try {
            Thread.sleep(Long.valueOf("1"));
        } catch (Exception e) {
            e.getStackTrace();
        }
        Random random = new Random(CalendarUtil.nowTimestamp());

        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < length; i++) {
            int rnd = random.nextInt(n);
            char code = arrayComplexCode[rnd];
            if('O'==code && USE_ZERO.equals(zeroOrO)) {
                code = '0';
            } else if('0'==code && USE_O.equals(zeroOrO)) {
                code = 'O';
            }

            if('I'==code && USE_ONE.equals(oneOrI)) {
                code = '1';
            } else if('1'==code && USE_I.equals(oneOrI)) {
                code = 'I';
            }
            sb.append(code);
        }
        return sb.toString();
    }

    /**
     * 生成随机纯字母随机数
     * @param length 生成长度
     */
    public static String charCode(int length) {
        int n = arrayCharCode.length;
        try {
            Thread.sleep(Long.valueOf("1"));
        } catch (Exception e) {
            e.getStackTrace();
        }
        Random random = new Random(CalendarUtil.nowTimestamp());

        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < length; i++) {
            int rnd = random.nextInt(n);
            sb.append(arrayCharCode[rnd]);
        }
        return sb.toString();
    }
}