package com.qs.serve.common.util;

import cn.hutool.core.util.IdUtil;
import com.qs.serve.common.framework.redis.RedisService;
import lombok.AllArgsConstructor;
import lombok.Getter;
import org.springframework.beans.BeansException;

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

/**
 * 生成编号
 * @author YenHex
 * @since 2023/6/25
 */
public class CodeGenUtil {

    @Getter
    @AllArgsConstructor
    public enum SourceKey{
        CostApply("cost_apply"),
        Activity("activity"),
        Verification("verification"),
        Policy("policy"),
        PolicyItem("policy_item");
        private String code;
    }

    @Getter
    @AllArgsConstructor
    public enum SourceDataKey{
        SaleRegion("S","SaleRegion"),
        BizRegion("B","BizRegion");
        private String prefix;
        private String code;
    }


    private static final int split_num = 1000;


    final static String[] digits2 = {
            "A" , "B" , "C" , "D" , "E" ,
            "F" , "G" , "H" ,"J" , "K" ,
            "L" , "M" , "N" , "P" ,
            "Q" , "R" , "T" , "U" , "V" , "W" ,
            "X" , "Y"
    };

    public static Long getIdx(String key){
        RedisService redisService = SpringUtils.getBean(RedisService.class);
        Long value = redisService.getLong(key);
        if(value==null){
            redisService.set(key,1);
            value = 1L;
        }else {
            value++;
        }
        redisService.set(key,value);
        return value;
    }

    public static String generate(SourceKey sourceKey){
        try {
            LocalDate localDateTime = LocalDate.now();
            DateTimeFormatter df = DateTimeFormatter.ofPattern("yyyyMMdd");
            String localTime = df.format(localDateTime);
            localTime = localTime.substring(2);
            String key = "code_index:"+sourceKey.getCode()+":"+localTime;
            return  localTime + getCommonValue(key);
        } catch (BeansException e) {
            e.printStackTrace();
        }
        return IdUtil.getSnowflakeNextIdStr();
    }

    public static String getCommonValue(String key){
        Long value = getIdx(key);
        String digitsNum = "";
        String appendStr = value+"";
        if(value>split_num){
            appendStr = (value%100)+"";
            Long d = value/split_num;
            digitsNum = digits2[d.intValue()];
        }
        StringBuilder appendZeros = new StringBuilder();
        for (int i = (appendStr+digitsNum).length(); i < 3; i++) {
            appendZeros.append("0");
        }
        return digitsNum + appendZeros + appendStr;
    }

    public static String getDataCode(SourceDataKey dataKey){
        String key = "code_data_index:"+dataKey.getCode();
        String commonVal = getCommonValue(key);
        return dataKey.getPrefix() + commonVal;
    }

    /**
     * 32个字符，用来表示32进制
     */
    final static char[] digits = {
            '0' , '1' , '2' , '3' , '4' , '5' ,
            '6' , '7' , '8' , '9' , 'A' , 'B' ,
            'C' , 'D' , 'E' , 'F' , 'G' , 'H' ,
            'J' , 'K' , 'L' , 'M' , 'N' , 'P' ,
            'Q' , 'R' , 'T' , 'U' , 'V' , 'W' ,
            'X' , 'Y'
    };

    /**
     * 10=>32
     * @param val
     * @return
     */
    static String digits32(long val) {
        // 32=2^5=二进制100000
        int shift = 5;
        // numberOfLeadingZeros 获取long值从高位连续为0的个数，比如val=0，则返回64
        // 此处mag=long值二进制减去高位0之后的长度
        int mag = Long.SIZE - Long.numberOfLeadingZeros(val);
        int len = Math.max(((mag + (shift - 1)) / shift), 1);
        char[] buf = new char[len];
        do {
            // &31相当于%32
            buf[--len] = digits[((int) val) & 31];
            val >>>= shift;
        } while (val != 0 && len > 0);
        return new String(buf);
    }


}