package com.xkrs.util;

import org.apache.http.Consts;
import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.mime.HttpMultipartMode;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.entity.mime.content.StringBody;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.*;

/**
 * http请求工具
 * @author tajochen
 **/
public class RequestUtil {

    private static final String FIREFOX_UA = "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:92.0) Gecko/20100101 Firefox/92.0";
    private static final String CHROME_UA = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 " +
            "(KHTML, like Gecko) Chrome/93.0.4577.63 Safari/537.36";

    /**
     * 模拟 get请求
     * @param url   链接
     * @param map   参数列表
     */
    public static String getStandard(String url, Map<String,String> map) {
        String body = "";
        // 1.拿到一个httpclient的对象
        CloseableHttpClient httpClient = HttpClients.createDefault();
        // 2.1 提交请求体
        ArrayList<NameValuePair> parameters = new ArrayList<>();
        URIBuilder builder = null;
        // 装填参数
        if(map!=null){
            for (Map.Entry<String, String> entry : map.entrySet()) {
                parameters.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
            }
        }
        CloseableHttpResponse response = null;
        try {
            builder = new URIBuilder(url);
            builder.setParameters(parameters);
            // 2.设置请求方式和请求信息
            HttpGet httpGet = new HttpGet(builder.build());
            // 2.1 提交header头信息
            httpGet.addHeader("user-agent", FIREFOX_UA);
            // 3.执行请求
            response = httpClient.execute(httpGet);
            // 4.获取返回值
            assert response != null;
            // 按指定编码转换结果实体为String类型
            body = EntityUtils.toString(response.getEntity(), StandardCharsets.UTF_8);
            // 5.关闭连接
            response.close();
            httpClient.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return body;
    }

    /**
     * 模拟Post请求 application/x-www-form-urlencoded
     * @param url   资源地址
     * @param map   参数列表
     * @return
     */
    public static String postStandard(String url, Map<String,String> map) {
        String body = "";
        // 创建httpclient对象
        CloseableHttpClient client = HttpClients.createDefault();
        // 创建post方式请求对象
        HttpPost httpPost = new HttpPost(url);
        // 装填参数
        List<NameValuePair> nvps = new ArrayList<>();
        if(map!=null){
            for (Map.Entry<String, String> entry : map.entrySet()) {
                nvps.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
            }
        }
        try {
            // 设置参数到请求对象中
            httpPost.setEntity(new UrlEncodedFormEntity(nvps, "UTF-8"));
            // 设置header报文头信息
            httpPost.setHeader("Content-type", "application/x-www-form-urlencoded");
            httpPost.setHeader("User-Agent", FIREFOX_UA);
            httpPost.setHeader("Accept", "application");
            httpPost.setHeader("Accept-Encoding", "gzip, deflate");
            // 执行请求操作，并拿到结果（同步阻塞）
            CloseableHttpResponse response = client.execute(httpPost);
            // 获取结果实体
            HttpEntity entity = response.getEntity();
            if (entity != null) {
                // 按指定编码转换结果实体为String类型
                body = EntityUtils.toString(entity, "UTF-8");
            }
            EntityUtils.consume(entity);
            // 释放链接
            response.close();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                client.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return body;
    }

    /**
     * 模拟Post请求 multipart/form-data
     * @param postFile 请求文件
     * @param postUrl 请求链接
     * @param postParam 请求参数
     * @return
     */
    public static String postFile(File postFile, String postUrl, Map<String,String> postParam) {
        Logger log = LoggerFactory.getLogger(RequestUtil.class);
        String body = "";
        Map<String,Object> resultMap = new HashMap<>(16);
        CloseableHttpClient httpClient = HttpClients.createDefault();
        try{
            // 把一个普通参数和文件上传给下面这个地址
            HttpPost httpPost = new HttpPost(postUrl);

            // 设置传输参数
            MultipartEntityBuilder multipartEntity = MultipartEntityBuilder.create();
            // 解决乱码问题
            multipartEntity.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
            multipartEntity.setCharset(StandardCharsets.UTF_8);

            // 设置文件参数 ，获取文件名postFile.getName()
            // 把文件转换成流对象FileBody
            multipartEntity.addBinaryBody("file",postFile,ContentType.create("multipart/form-data",
                    Consts.UTF_8),postFile.getName());
            // 设计文件以外的参数
            Set<String> keySet = postParam.keySet();
            for (String key : keySet) {
                // 相当于<input type="text" name="name" value=name>
                multipartEntity.addPart(key, new StringBody(postParam.get(key), ContentType.create(
                        "multipart/form-data", Consts.UTF_8)));
            }
            HttpEntity reqEntity =  multipartEntity.build();
            httpPost.setEntity(reqEntity);
            // 设置header报文头信息
            httpPost.setHeader("User-Agent", FIREFOX_UA);
            httpPost.setHeader("Accept","text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
            httpPost.setHeader("Accept-Encoding","gzip, deflate");

            // 发起请求，返回请求的响应
            try (CloseableHttpResponse response = httpClient.execute(httpPost)) {
                resultMap.put("statusCode", response.getStatusLine().getStatusCode());
                // 获取响应对象
                HttpEntity resEntity = response.getEntity();
                if (resEntity != null) {
                    // 按指定编码转换结果实体为String类型
                    body = EntityUtils.toString(resEntity, StandardCharsets.UTF_8);
                }
                // 销毁
                EntityUtils.consume(resEntity);
            } catch (Exception e) {
                e.printStackTrace();
            }
            httpClient.close();
        } catch (IOException e1) {
            e1.printStackTrace();
        }
        return body;
    }
}