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package org.kaizen4j.common.httpclient;

import com.google.common.base.Preconditions;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import org.apache.commons.lang3.StringUtils;
import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.*;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.entity.StringEntity;
import org.apache.http.message.BasicNameValuePair;
import org.kaizen4j.common.util.JsonUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.CollectionUtils;

import java.net.URI;
import java.net.URISyntaxException;
import java.util.List;
import java.util.Map;

import static java.nio.charset.StandardCharsets.UTF_8;
import static org.kaizen4j.common.base.Symbols.QUESTION_MARK;

public abstract class AbstractHttpClientProxy {

    private static final Logger logger = LoggerFactory.getLogger(AbstractHttpClientProxy.class);

    public HttpResult post(String requestUrl, Map requestParam) {
        return post(requestUrl, requestParam, Maps.newHashMap());
    }

    /**
     * 发送 POST 请求
     *
     * @param requestUrl 请求URL地址
     * @param requestParam 请求参数
     * @param requestHeader 请求头
     * @return HttpResult 对象
     */
    public HttpResult post(String requestUrl, Map requestParam, Map requestHeader) {
        Preconditions.checkNotNull(requestParam, "Request parameter must be not null");

        List nameValuePairs = Lists.newArrayList();
        requestParam.forEach((name, value) -> nameValuePairs.add(new BasicNameValuePair(name, value)));
        logger.info("Send POST request body: {}", JsonUtils.getJson(nameValuePairs));

        HttpEntity requestEntity = new UrlEncodedFormEntity(nameValuePairs, UTF_8);
        return post(requestUrl, requestHeader, requestEntity);
    }

    public HttpResult post(String requestUrl, String requestBody) {
        return post(requestUrl, requestBody, Maps.newHashMap());
    }

    /**
     * 发送 POST 请求
     *
     * @param requestUrl 请求URL地址
     * @param requestBody 请求内容体
     * @param requestHeader 请求头
     * @return HttpResult 对象
     */
    public HttpResult post(String requestUrl, String requestBody, Map requestHeader) {
        Preconditions.checkNotNull(requestBody, "Request body must be not null");
        logger.info("Send POST request body: {}", requestBody);

        HttpEntity requestEntity = new StringEntity(requestBody, UTF_8);
        return post(requestUrl, requestHeader, requestEntity);
    }

    /**
     * 发送 GET 请求
     *
     * @param requestUrl 请求URL地址
     * @param requestParam 请求参数
     * @param requestHeader 请求头
     * @return HttpResult 对象
     */
    public HttpResult get(String requestUrl, Map requestParam, Map requestHeader) {
        HttpGet httpGet = new HttpGet(getFullRequestUrl(requestUrl, requestParam));
        return request(httpGet, requestHeader);
    }

    public HttpResult put(String requestUrl, Map requestParam, Map requestHeader) {
        HttpPut httpPut = new HttpPut(getFullRequestUrl(requestUrl, requestParam));
        return request(httpPut, requestHeader);
    }

    public HttpResult delete(String requestUrl, Map requestParam, Map requestHeader) {
        HttpDelete httpDelete = new HttpDelete(getFullRequestUrl(requestUrl, requestParam));
        return request(httpDelete, requestHeader);
    }

    /**
     * 执行 POST 请求发送
     *
     * @param requestUrl 请求URL地址
     * @param requestHeader 请求头
     * @param requestEntity 请求实体
     * @return HttpResult 对象
     */
    private HttpResult post(String requestUrl, Map requestHeader, HttpEntity requestEntity) {
        Preconditions.checkNotNull(requestUrl, "Request url must be not null");
        Preconditions.checkNotNull(requestEntity, "HttpEntity must be not null");

        HttpPost httpPost = new HttpPost(requestUrl);
        /* 请求内容 */
        httpPost.setEntity(requestEntity);

        return request(httpPost, requestHeader);
    }

    private String getFullRequestUrl(String requestUrl, Map requestParam) {
        Preconditions.checkNotNull(requestUrl, "Request url must be not null");

        if (CollectionUtils.isEmpty(requestParam)) {
            return requestUrl;
        } else {
            List nameValuePairs = Lists.newArrayList();
            requestParam.forEach((name, value) -> nameValuePairs.add(new BasicNameValuePair(name, value)));

            try {
                URIBuilder uriBuilder = new URIBuilder().setCharset(UTF_8);
                URI requestUri = uriBuilder.addParameters(nameValuePairs).build();
                return StringUtils.join(requestUrl, QUESTION_MARK, requestUri.getQuery());
            } catch (URISyntaxException e) {
                throw new RuntimeException(e);
            }
        }
    }

    protected abstract HttpResult request(HttpRequestBase httpRequestBase, Map requestHeader);

}