package com.dy.common.util;

import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;

import org.apache.commons.lang3.StringUtils;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpDelete;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpPut;
import org.apache.http.entity.ByteArrayEntity;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.conn.ClientConnectionManager;
import org.apache.http.conn.scheme.Scheme;
import org.apache.http.conn.scheme.SchemeRegistry;
import org.apache.http.conn.ssl.SSLSocketFactory;

public class HttpUtils {
	/**
	 * get
	 * 
	 * @param host 服务端URI
	 * @param path 请求路径
	 * @param headers 请求头
	 * @param params 请求参数
	 * @return HttpResponse响应
	 * @throws Exception 异常
	 */
	public static HttpResponse doGet(String host, String path, Map<String, String> headers,
			Map<String, String> params) throws Exception{
		HttpClient httpClient = wrapClient(host);

		HttpGet request = new HttpGet(buildUrl(host, path, params));
		if(headers != null){
			for (Map.Entry<String, String> e : headers.entrySet()) {
				request.addHeader(e.getKey(), e.getValue());
			}
		}

		return httpClient.execute(request);
	}

	/**
	 * post form
	 *
	 * @param host 服务端URI
	 * @param path 请求路径
	 * @param headers 请求头
	 * @param params 请求参数
	 * @param bodies 请求体
	 * @return HttpResponse响应
	 * @throws Exception 异常
	 */
	public static HttpResponse doPost(String host, String path, Map<String, String> headers,
			Map<String, String> params, Map<String, String> bodies) throws Exception {
		HttpClient httpClient = wrapClient(host);

		HttpPost request = new HttpPost(buildUrl(host, path, params));
		for (Map.Entry<String, String> e : headers.entrySet()) {
			request.addHeader(e.getKey(), e.getValue());
		}

		if (bodies != null) {
			List<NameValuePair> nameValuePairList = new ArrayList<>();

			for (String key : bodies.keySet()) {
				nameValuePairList.add(new BasicNameValuePair(key, bodies.get(key)));
			}
			UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(nameValuePairList, "utf-8");
			formEntity.setContentType("application/x-www-form-urlencoded; charset=UTF-8");
			request.setEntity(formEntity);
		}

		return httpClient.execute(request);
	}

	/**
	 * Post String
	 *
	 * @param host 服务端URI
	 * @param path 请求路径
	 * @param headers 请求头
	 * @param params 请求参数
	 * @param body 请求体
	 * @return HttpResponse响应
	 * @throws Exception 异常
	 */
	public static HttpResponse doPost(String host, String path, Map<String, String> headers,
			Map<String, String> params, String body) throws Exception {
		HttpClient httpClient = wrapClient(host);

		HttpPost request = new HttpPost(buildUrl(host, path, params));
		for (Map.Entry<String, String> e : headers.entrySet()) {
			request.addHeader(e.getKey(), e.getValue());
		}

		if (StringUtils.isNotBlank(body)) {
			request.setEntity(new StringEntity(body, "utf-8"));
		}

		return httpClient.execute(request);
	}

	/**
	 * Post stream
	 *
	 * @param host 服务端URI
	 * @param path 请求路径
	 * @param headers 请求头
	 * @param params 请求参数
	 * @param body 请求体
	 * @return HttpResponse响应
	 * @throws Exception 异常
	 */
	public static HttpResponse doPost(String host, String path, Map<String, String> headers,
			Map<String, String> params, byte[] body) throws Exception {
		HttpClient httpClient = wrapClient(host);

		HttpPost request = new HttpPost(buildUrl(host, path, params));
		if(headers != null){
			for (Map.Entry<String, String> e : headers.entrySet()) {
				request.addHeader(e.getKey(), e.getValue());
			}
		}

		if (body != null) {
			request.setEntity(new ByteArrayEntity(body));
		}

		return httpClient.execute(request);
	}

	/**
	 * Put String
	 *
	 * @param host 服务端URI
	 * @param path 请求路径
	 * @param headers 请求头
	 * @param params 请求参数
	 * @param body 请求体
	 * @return HttpResponse响应
	 * @throws Exception 异常
	 */
	public static HttpResponse doPut(String host, String path, Map<String, String> headers,
			Map<String, String> params, String body) throws Exception {
		HttpClient httpClient = wrapClient(host);

		HttpPut request = new HttpPut(buildUrl(host, path, params));
		for (Map.Entry<String, String> e : headers.entrySet()) {
			request.addHeader(e.getKey(), e.getValue());
		}

		if (StringUtils.isNotBlank(body)) {
			request.setEntity(new StringEntity(body, "utf-8"));
		}

		return httpClient.execute(request);
	}

	/**
	 * Put stream
	 *
	 * @param host 服务端URI
	 * @param path 请求路径
	 * @param headers 请求头
	 * @param params 请求参数
	 * @param body 请求体
	 * @return HttpResponse响应
	 * @throws Exception 异常
	 */
	public static HttpResponse doPut(String host, String path, Map<String, String> headers,
			Map<String, String> params, byte[] body) throws Exception {
		HttpClient httpClient = wrapClient(host);

		HttpPut request = new HttpPut(buildUrl(host, path, params));
		for (Map.Entry<String, String> e : headers.entrySet()) {
			request.addHeader(e.getKey(), e.getValue());
		}

		if (body != null) {
			request.setEntity(new ByteArrayEntity(body));
		}

		return httpClient.execute(request);
	}

	/**
	 * Delete
	 *
	 * @param host 服务端URI
	 * @param path 请求路径
	 * @param headers 请求头
	 * @param params 请求参数
	 * @return HttpResponse响应
	 * @throws Exception 异常
	 */
	public static HttpResponse doDelete(String host, String path, Map<String, String> headers,
			Map<String, String> params) throws Exception {
		HttpClient httpClient = wrapClient(host);

		HttpDelete request = new HttpDelete(buildUrl(host, path, params));
		for (Map.Entry<String, String> e : headers.entrySet()) {
			request.addHeader(e.getKey(), e.getValue());
		}

		return httpClient.execute(request);
	}

	private static String buildUrl(String host, String path, Map<String, String> params) {
		StringBuilder sbUrl = new StringBuilder();
		sbUrl.append(host);
		if (!StringUtils.isBlank(path)) {
			sbUrl.append(path);
		}
		if (null != params) {
			StringBuilder sbQuery = new StringBuilder();
			for (Map.Entry<String, String> query : params.entrySet()) {
				if (0 < sbQuery.length()) {
					sbQuery.append("&");
				}
				if (StringUtils.isBlank(query.getKey()) && !StringUtils.isBlank(query.getValue())) {
					sbQuery.append(query.getValue());
				}
				if (!StringUtils.isBlank(query.getKey())) {
					sbQuery.append(query.getKey());
					if (!StringUtils.isBlank(query.getValue())) {
						sbQuery.append("=");
						sbQuery.append(URLEncoder.encode(query.getValue(), StandardCharsets.UTF_8));
					}
				}
			}
			if (0 < sbQuery.length()) {
				sbUrl.append("?").append(sbQuery);
			}
		}

		return sbUrl.toString();
	}

	private static HttpClient wrapClient(String host) {
		CloseableHttpClient httpClient = HttpClients.createDefault();
		if (host.startsWith("https://")) {
			sslClient(httpClient);
		}

		return httpClient;
	}

	private static void sslClient(HttpClient httpClient) {
		try {
			SSLContext ctx = SSLContext.getInstance("TLS");
			X509TrustManager tm = new X509TrustManager() {
				public X509Certificate[] getAcceptedIssuers() {
					return null;
				}

				public void checkClientTrusted(X509Certificate[] xcs, String str) {

				}

				public void checkServerTrusted(X509Certificate[] xcs, String str) {

				}
			};
			ctx.init(null, new TrustManager[] { tm }, null);
			SSLSocketFactory ssf = new SSLSocketFactory(ctx);
			ssf.setHostnameVerifier(SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);
			ClientConnectionManager ccm = httpClient.getConnectionManager();
			SchemeRegistry registry = ccm.getSchemeRegistry();
			registry.register(new Scheme("https", 443, ssf));
		} catch (KeyManagementException ex) {
			throw new RuntimeException(ex);
		} catch (NoSuchAlgorithmException ex) {
			throw new RuntimeException(ex);
		}
	}
}