package com.code2roc.fastface.util;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.Charset;
import java.util.UUID;

public class CommonUtil {
    public static String getNewLine() {
        return System.getProperty("line.separator");
    }

    public static String getNewGuid() {
        String dateStr = DateUtil.getDateTagToSecond();
        String randomStr = UUID.randomUUID().toString();
        return dateStr + randomStr.substring(0, 36);
    }

    public static Object getRequestBodyPostParam(String paramName) {
        HttpServletRequest request = getRequest();
        Object paramValue;
        String body = "";
        try {
            body = getBodyString(request);
            JSONObject obj = JSON.parseObject(body);
            paramValue = obj.get(paramName);
        } catch (Exception e) {
            paramValue = "";
        }
        return paramValue;
    }

    public static HttpServletRequest getRequest() {
        ServletRequestAttributes requestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
        if (requestAttributes != null) {
            return requestAttributes.getRequest();
        } else {
            return null;
        }
    }

    public static String getBodyString(HttpServletRequest request) throws IOException {
        StringBuilder sb = new StringBuilder();
        InputStream inputStream = null;
        BufferedReader reader = null;
        try {
            inputStream = request.getInputStream();
            reader = new BufferedReader(new InputStreamReader(inputStream, Charset.forName("UTF-8")));
            String line = "";
            while ((line = reader.readLine()) != null) {
                sb.append(line);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (inputStream != null) {
                try {
                    inputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (reader != null) {
                try {
                    reader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return sb.toString();
    }
}