package com.peanut.common.utils;

import org.apache.commons.io.IOUtils;
import org.apache.commons.lang.StringUtils;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.config.RequestConfig.Builder;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.conn.ConnectTimeoutException;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.conn.ssl.SSLContextBuilder;
import org.apache.http.conn.ssl.X509HostnameVerifier;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSession;
import javax.net.ssl.SSLSocket;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.SocketTimeoutException;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.security.GeneralSecurityException;
import java.security.cert.X509Certificate;
import java.util.Map;

public class HttpClientUtils {

    public static final int connTimeout = 10000;
    public static final int readTimeout = 10000;
    public static final String charset = "UTF-8";
    private static HttpClient client;
    private static final Logger log = LoggerFactory.getLogger(HttpClientUtils.class);

    static {
        PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager();
        cm.setMaxTotal(128);
        cm.setDefaultMaxPerRoute(128);
        client = HttpClients.custom().setConnectionManager(cm).build();
    }

    public static String get(String url) throws Exception {
        return get(url, charset, null, null);
    }

    public static String get(String url, String charset) throws Exception {
        return get(url, charset, connTimeout, readTimeout);
    }

    /**
     * 发送一个 Post 请求, 使用指定的字符集编码.
     *
     * @param url
     * @param body        RequestBody
     * @param mimeType    例如 application/xml "application/x-www-form-urlencoded" a=1&b=2&c=3
     * @param charset     编码
     * @param connTimeout 建立链接超时时间,毫秒.
     * @param readTimeout 响应超时时间,毫秒.
     * @return ResponseBody, 使用指定的字符集编码.
     * @throws ConnectTimeoutException 建立链接超时异常
     * @throws SocketTimeoutException  响应超时
     * @throws Exception
     */
    public static String post(String url, String body, String mimeType, String charset, Integer connTimeout, Integer readTimeout)
            throws ConnectTimeoutException, SocketTimeoutException, Exception {
        HttpClient client = null;
        HttpPost post = new HttpPost(url);
        String result = "";
        try {
            if (StringUtils.isNotBlank(body)) {
                HttpEntity entity = new StringEntity(body, ContentType.create(mimeType, charset));
                post.setEntity(entity);
            }
            // 设置参数
            Builder customReqConf = RequestConfig.custom();
            if (connTimeout != null) {
                customReqConf.setConnectTimeout(connTimeout);
            }
            if (readTimeout != null) {
                customReqConf.setSocketTimeout(readTimeout);
            }
            post.setConfig(customReqConf.build());

            HttpResponse res;
            if (url.startsWith("https")) {
                // 执行 Https 请求.
                client = createSSLInsecureClient();
                res = client.execute(post);
            } else {
                // 执行 Http 请求.
                client = HttpClientUtils.client;
                res = client.execute(post);
            }
            result = IOUtils.toString(res.getEntity().getContent(), charset);
        } finally {
            post.releaseConnection();
            if (url.startsWith("https") && client instanceof CloseableHttpClient) {
                ((CloseableHttpClient) client).close();
            }
        }
        return result;
    }


    /**
     * 发送一个 GET 请求
     */
    public static String get(String url, String charset, Integer connTimeout, Integer readTimeout)
            throws Exception {

        HttpClient client = null;
        HttpGet get = new HttpGet(url);
        String result = "";
        try {
            // 设置参数
            Builder customReqConf = RequestConfig.custom();
            if (connTimeout != null) {
                customReqConf.setConnectTimeout(connTimeout);
            }
            if (readTimeout != null) {
                customReqConf.setSocketTimeout(readTimeout);
            }
            get.setConfig(customReqConf.build());

            HttpResponse res = null;

            if (url.startsWith("https")) {
                // 执行 Https 请求.
                client = createSSLInsecureClient();
                res = client.execute(get);
            } else {
                // 执行 Http 请求.
                client = HttpClientUtils.client;
                res = client.execute(get);
            }

            result = IOUtils.toString(res.getEntity().getContent(), charset);
        } finally {
            get.releaseConnection();
            if (url.startsWith("https") && client != null && client instanceof CloseableHttpClient) {
                ((CloseableHttpClient) client).close();
            }
        }
        return result;
    }

    /**
     * 从 response 里获取 charset
     */
    @SuppressWarnings("unused")
    private static String getCharsetFromResponse(HttpResponse ressponse) {
        // Content-Type:text/html; charset=GBK
        if (ressponse.getEntity() != null && ressponse.getEntity().getContentType() != null && ressponse.getEntity().getContentType().getValue() != null) {
            String contentType = ressponse.getEntity().getContentType().getValue();
            if (contentType.contains("charset=")) {
                return contentType.substring(contentType.indexOf("charset=") + 8);
            }
        }
        return null;
    }

    /**
     * 创建 SSL连接
     *
     * @return
     * @throws GeneralSecurityException
     */
    private static CloseableHttpClient createSSLInsecureClient() throws GeneralSecurityException {
        try {
            SSLContext sslContext = new SSLContextBuilder().loadTrustMaterial(null, (chain, authType) -> true).build();

            SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(sslContext, new X509HostnameVerifier() {

                @Override
                public boolean verify(String arg0, SSLSession arg1) {
                    return true;
                }

                @Override
                public void verify(String host, SSLSocket ssl) {
                }

                @Override
                public void verify(String host, X509Certificate cert) {
                }

                @Override
                public void verify(String host, String[] cns,
                                   String[] subjectAlts) {
                }
            });
            return HttpClients.custom().setSSLSocketFactory(sslsf).build();

        } catch (GeneralSecurityException e) {
            throw e;
        }
    }


    /**
     * 快递鸟向指定 URL 发送POST方法的请求
     * url 发送请求的 URL
     * params 请求的参数集合
     *
     * @return 远程资源的响应结果
     */
    public static String kdSendPost(String url, Map<String, String> params) {
        OutputStreamWriter out = null;
        BufferedReader in = null;
        StringBuilder result = new StringBuilder();
        try {
            URL realUrl = new URL(url);
            HttpURLConnection conn = (HttpURLConnection) realUrl.openConnection();
            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // POST方法
            conn.setRequestMethod("POST");
            // 设置通用的请求属性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
            conn.connect();
            // 获取URLConnection对象对应的输出流
            out = new OutputStreamWriter(conn.getOutputStream(), StandardCharsets.UTF_8);
            // 发送请求参数
            if (params != null) {
                StringBuilder param = new StringBuilder();
                for (Map.Entry<String, String> entry : params.entrySet()) {
                    if (param.length() > 0) {
                        param.append("&");
                    }
                    param.append(entry.getKey());
                    param.append("=");
                    param.append(entry.getValue());
                    log.info(entry.getKey() + ":" + entry.getValue());
                }
                log.info("param:" + param.toString());
                out.write(param.toString());
            }
            // flush输出流的缓冲
            out.flush();
            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader(
                    new InputStreamReader(conn.getInputStream(), StandardCharsets.UTF_8));
            String line;
            while ((line = in.readLine()) != null) {
                result.append(line);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        //使用finally块来关闭输出流、输入流
        finally {
            try {
                if (out != null) {
                    out.close();
                }
                if (in != null) {
                    in.close();
                }
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
        return result.toString();
    }
}