package com.qs.cost.common.utils;

import lombok.extern.slf4j.Slf4j;
import org.springframework.http.MediaType;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;

/**
 * @author YenHex
 * @since 2022/2/25
 */
@Slf4j
public class ServletUtil {

    /**
     * 获取用户真实IP
     *
     * @return
     */
    public static String getIpAddress(HttpServletRequest request) {
        // 优先取X-Real-IP
        String ip = request.getHeader("X-Real-IP");
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("x-forwarded-for");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
            if ("0:0:0:0:0:0:0:1".equals(ip)) {
                ip = "undefined";
            }
        }
        if ("unknown".equalsIgnoreCase(ip)) {
            ip = "undefined";
            return ip;
        }
        int pos = ip.indexOf(',');
        if (pos >= 0) {
            ip = ip.substring(0, pos);
        }
        return ip;
    }

    /**
     * 判断本次请求的数据类型是否为json
     * @param request request
     * @return true: 是 JSON 数据; false: 非 json 数据
     */
    public static boolean isJsonRequest(HttpServletRequest request) {
        if (request.getContentType() != null) {
            return request.getContentType().equals(MediaType.APPLICATION_JSON_VALUE) ||
                    request.getContentType().equals(MediaType.APPLICATION_JSON_UTF8_VALUE);
        }
        return false;
    }

    /**
     * 获取query参数
     * @param request
     * @return
     */
    public static Map<String, String> getParameterMapAll(HttpServletRequest request) {
        Enumeration<String> parameters = request.getParameterNames();
        Map<String, String> params = new HashMap<>();
        while (parameters.hasMoreElements()) {
            String parameter = parameters.nextElement();
            String value = request.getParameter(parameter);
            params.put(parameter, value);
        }
        return params;
    }

    /**
     * 获取请求Body
     *
     * @param request
     * @return
     */
    public static String getBodyString(ServletRequest request) {
        StringBuilder sb = new StringBuilder();
        InputStream inputStream = null;
        BufferedReader reader = null;
        try {
            inputStream = request.getInputStream();
            reader = new BufferedReader(new InputStreamReader(inputStream, StandardCharsets.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();
    }

}