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package net.arccode.wechat.pay.api.common.util;

import com.squareup.okhttp.Callback;
import com.squareup.okhttp.OkHttpClient;
import com.squareup.okhttp.Request;
import com.squareup.okhttp.Response;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.conn.ConnectTimeoutException;
import org.apache.http.conn.ConnectionPoolTimeoutException;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.ssl.SSLContexts;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.net.ssl.SSLContext;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.net.SocketTimeoutException;
import java.security.*;
import java.security.cert.CertificateException;
import java.util.concurrent.TimeUnit;

/**
 *  * Http工具, 普通使用OkHTTP; 对于需要加载证书访问的情况, 暂时使用HttpClient实现
 *
 * OkHttp官方文档并不建议我们创建多个OkHttpClient,因此全局使用一个.
 *
 * 
 *
 * @author http://arccode.net
 * @since 2015-09-09
 */
public class HttpUtils {

    private static final Logger LOG = LoggerFactory.getLogger(HttpUtils.class);

    private static final OkHttpClient mOkHttpClient = new OkHttpClient();


    //表示请求器是否已经做了初始化工作
    private static boolean hasInit = false;

    //连接超时时间，默认10秒
    private static int socketTimeout = 10000;

    //请求器的配置
    private static RequestConfig requestConfig;

    //传输超时时间，默认30秒
    private static int connectTimeout = 30000;

    //HTTP请求器
    private static CloseableHttpClient httpClient;

    static {
        mOkHttpClient.setConnectTimeout(30, TimeUnit.SECONDS);
    }

    /**
     * 初始化 SSL
     *
     * @throws IOException
     * @throws KeyStoreException
     * @throws UnrecoverableKeyException
     * @throws NoSuchAlgorithmException
     * @throws KeyManagementException
     */
    private static void init(String certPwd, String certPath) throws IOException, KeyStoreException, UnrecoverableKeyException, NoSuchAlgorithmException, KeyManagementException {

        KeyStore keyStore = KeyStore.getInstance("PKCS12");
        FileInputStream instream = new FileInputStream(new File(certPath));//加载本地的证书进行https加密传输
        try {
            keyStore.load(instream, certPwd.toCharArray());//设置证书密码
        } catch (CertificateException e) {
            e.printStackTrace();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } finally {
            instream.close();
        }

        // Trust own CA and all self-signed certs
        SSLContext sslcontext = SSLContexts.custom()
                .loadKeyMaterial(keyStore, certPwd.toCharArray())
                .build();
        // Allow TLSv1 protocol only
        SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(
                sslcontext,
                new String[]{"TLSv1"},
                null,
                SSLConnectionSocketFactory.BROWSER_COMPATIBLE_HOSTNAME_VERIFIER);

        httpClient = HttpClients.custom()
                .setSSLSocketFactory(sslsf)
                .build();

        //根据默认超时限制初始化requestConfig
        requestConfig = RequestConfig.custom().setSocketTimeout(socketTimeout).setConnectTimeout(connectTimeout).build();

        hasInit = true;
    }

    /**
     * 该不会开启异步线程。
     *
     * @param request
     * @return
     * @throws java.io.IOException
     */
    public static Response execute(Request request) throws IOException {
        return mOkHttpClient.newCall(request).execute();
    }

    /**
     * 带证书发送请求, 该不会开启异步线程。
     *
     * @param url
     * @param body
     * @param certPwd
     * @param certPath
     * @return
     * @throws Exception
     */
    public static String executeAttachCA(String url, String body, String certPwd, String certPath) throws Exception {

        if (!hasInit) {
            init(certPwd, certPath);
        }

        String result = null;

        HttpPost httpPost = new HttpPost(url);

        //解决XStream对出现双下划线的bug

        LOG.info("API，POST过去的数据是：");
        LOG.info(body);

        //得指明使用UTF-8编码，否则到API服务器XML的中文不能被成功识别
        StringEntity postEntity = new StringEntity(body, "UTF-8");
        httpPost.addHeader("Content-Type", "text/xml");
        httpPost.setEntity(postEntity);

        //设置请求器的配置
        httpPost.setConfig(requestConfig);

        LOG.info("executing request" + httpPost.getRequestLine());

        try {
            HttpResponse response = httpClient.execute(httpPost);

            HttpEntity entity = response.getEntity();

            result = EntityUtils.toString(entity, "UTF-8");

        } catch (ConnectionPoolTimeoutException e) {
            LOG.warn("http get throw ConnectionPoolTimeoutException(wait time out)");

        } catch (ConnectTimeoutException e) {
            LOG.warn("http get throw ConnectTimeoutException");

        } catch (SocketTimeoutException e) {
            LOG.warn("http get throw SocketTimeoutException");

        } catch (Exception e) {
            LOG.warn("http get throw Exception");

        } finally {
            httpPost.abort();
        }

        return result;

    }

    /**
     * 开启异步线程访问网络
     *
     * @param request
     * @param responseCallback
     */
    public static void enqueue(Request request, Callback responseCallback) {
        mOkHttpClient.newCall(request).enqueue(responseCallback);
    }

    /**
     * 开启异步线程访问网络, 且不在意返回结果（实现空callback）
     *
     * @param request
     */
    public static void enqueue(Request request) {
        mOkHttpClient.newCall(request).enqueue(new Callback() {

            @Override
            public void onResponse(Response arg0) throws IOException {

            }

            @Override
            public void onFailure(Request arg0, IOException arg1) {

            }
        });
    }

    public static String getStringFromServer(String url) throws IOException {
        Request request = new Request.Builder().url(url).build();
        Response response = execute(request);
        if (response.isSuccessful()) {
            String responseUrl = response.body().string();
            return responseUrl;
        } else {
            throw new IOException("Unexpected code " + response);
        }
    }
}