package com.glxp.api.util;

import lombok.extern.slf4j.Slf4j;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import java.util.UUID;

@Slf4j
public class AppUtils {
    //生成secret_key
    private final static String SALT = "1qazxsw2";
    private static final String ALGORITH_NAME = "sha-512";
    private static final int HASH_ITERATIONS = 2;
    private final static String[] CHARS = new String[]{"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", "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"};

    public static String getAppid() {
        StringBuffer shortBuffer = new StringBuffer();
        String uuid = UUID.randomUUID().toString().replace("-", "");
        for (int i = 0; i < 8; i++) {
            String str = uuid.substring(i * 4, i * 4 + 4);
            int x = Integer.parseInt(str, 16);
            shortBuffer.append(CHARS[x % 0x3E]);
        }
        return shortBuffer.toString();
    }

    public static String getSecretKey(String appid) {
        try {
            String[] array = new String[]{appid, SALT};
            StringBuilder sb = new StringBuilder();

            Arrays.sort(array);
            for (String s : array) {
                sb.append(s);
            }
            String str = sb.toString();
            MessageDigest md = MessageDigest.getInstance("SHA-1");
            md.update(str.getBytes());
            byte[] digest = md.digest();

            StringBuilder hexstr = new StringBuilder();
            String shaHex = "";
            for (byte b : digest) {
                shaHex = Integer.toHexString(b & 0xFF);
                if (shaHex.length() < 2) {
                    hexstr.append(0);
                }
                hexstr.append(shaHex);
            }
            return hexstr.toString();
        } catch (NoSuchAlgorithmException e) {
            log.error(e.getMessage(), e);
            throw new RuntimeException();
        }
    }
}