package com.flagnote.gateway.utils;

import java.io.UnsupportedEncodingException;
import java.util.Date;

import org.springframework.util.DigestUtils;

public class BizKeyUtils {

	public static final String MIX_STRING = "6v8muhqp8ta45ncsyi8y";

	public static final String RANGE_STRING = "abcdefhikmnopqstuvwxyz23456789";

	public static String getKey() {

		StringBuffer sb = new StringBuffer();

		for (int i = 0; i < 13; i++) {
			sb.append(RANGE_STRING.charAt(RandomUtils.nextInt(30)));
		}

		sb.append(getFilteredKey(md5(sb.toString() + MIX_STRING + getPrefixTime())));

		return sb.toString();
	}

	public static String getFilteredKey(String key) {
		String result = "";
		for (int i = 0; i < key.length(); i++) {
			String ts = String.valueOf(key.charAt(i));
			if (RANGE_STRING.indexOf(ts) >= 0) {
				result += ts;
			}

			if (result.length() == 3) {
				return result;
			}
		}

		for (int i = 1; i < 3; i++) {
			result += "x";
		}

		return result;
	}

	public static Boolean validateKey(String key) {
		String oKey = key.substring(0, 13);

		String cKey = oKey + getFilteredKey(md5(oKey + MIX_STRING + getPrefixTime()));

		if (cKey.equals(key)) {
			return true;
		}

		cKey = oKey + getFilteredKey(md5(oKey + MIX_STRING + (getPrefixTime() - 1)));

		if (cKey.equals(key)) {
			return true;
		}

		cKey = oKey + getFilteredKey(md5(oKey + MIX_STRING + (getPrefixTime() + 1)));

		if (cKey.equals(key)) {
			return true;
		}

		return false;
	}

	public static String mixKey(String key) {
		return md5(key + md5(MIX_STRING + key));
	}

	public static String md5(String text) {
		try {
			return DigestUtils.md5DigestAsHex(text.getBytes("UTF-8"));
		} catch (UnsupportedEncodingException e) {
			throw new RuntimeException("无法生成MD5");
		}
	}

	public static Integer getPrefixTime() {
		return Integer.parseInt(String.valueOf(new Date().getTime()).substring(0, 4));
	}

	public static String getCipher(String key,String initTime) {
		return md5(key +"#"+ MIX_STRING + "#" + initTime);
	}
	
	public static Boolean validateCipher(String key,String initTime,String cipher) {
		return md5(key +"#"+ MIX_STRING + "#" + initTime).equals(cipher);
	}
	

	public static String getSecretKey(String key, String password) {
		return md5(key + md5(MIX_STRING + password));
	}

}