package com.alibaba.jstorm.daemon.nimbus.metric.uploader;

import backtype.storm.generated.TopologyMetric;
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.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class AlimonitorClient extends DefaultMetricUploader {

    public static Logger LOG = LoggerFactory.getLogger(AlimonitorClient.class);

    // Send to localhost:15776 by default
    public static final String DEFAUT_ADDR = "127.0.0.1";
    public static final String DEFAULT_PORT = "15776";
    public static final int DEFAUTL_FLAG = 0;
    public static final String DEFAULT_ERROR_INFO = "";

    private final String COLLECTION_FLAG = "collection_flag";
    private final String ERROR_INFO = "error_info";
    private final String MSG = "MSG";

    private String port;
    private String requestIP;
    private String monitorName;
    private int collectionFlag;
    private String errorInfo;

    private boolean post;

    public AlimonitorClient() {
    }

    public AlimonitorClient(String requestIP, String port, boolean post) {
        this.requestIP = requestIP;
        this.port = port;
        this.post = post;
        this.monitorName = null;
        this.collectionFlag = 0;
        this.errorInfo = null;
    }

    public void setIpAddr(String ipAddr) {
        this.requestIP = ipAddr;
    }

    public void setPort(String port) {
        this.port = port;
    }

    public void setMonitorName(String monitorName) {
        this.monitorName = monitorName;
    }

    public void setCollectionFlag(int flag) {
        this.collectionFlag = flag;
    }

    public void setErrorInfo(String msg) {
        this.errorInfo = msg;
    }

    public void setPostFlag(boolean post) {
        this.post = post;
    }

    public String buildURL() {
        return "http://" + requestIP + ":" + port + "/passive";
    }

    public String buildRqstAddr() {
        return "http://" + requestIP + ":" + port + "/passive?name=" + monitorName + "&msg=";
    }

    
    public Map buildAliMonitorMsg(int collection_flag, String error_message) {
        // Json format of the message sent to Alimonitor
        // {
        // "collection_flag":int,
        // "error_info":string,
        // "MSG": ojbect | array
        // }
        Map ret = new HashMap();
        ret.put(COLLECTION_FLAG, collection_flag);
        ret.put(ERROR_INFO, error_message);
        ret.put(MSG, null);

        return ret;
    }

    private void addMsgData(Map jsonObj, Map<String, Object> map) {
        jsonObj.put(MSG, map);
    }

    private boolean sendRequest(int collection_flag, String error_message, Map<String, Object> msg) throws Exception {
        boolean ret = false;

        if (msg.size() == 0)
            return ret;

        Map jsonObj = buildAliMonitorMsg(collection_flag, error_message);
        addMsgData(jsonObj, msg);
        String jsonMsg = jsonObj.toString();
        LOG.info(jsonMsg);

        if (post == true) {
            String url = buildURL();
            ret = httpPost(url, jsonMsg);
        } else {
            String request = buildRqstAddr();
            StringBuilder postAddr = new StringBuilder();
            postAddr.append(request);
            postAddr.append(URLEncoder.encode(jsonMsg));

            ret = httpGet(postAddr);
        }

        return ret;
    }

    private boolean httpGet(StringBuilder postAddr) {
        boolean ret = false;

        CloseableHttpClient httpClient = HttpClientBuilder.create().build();
        CloseableHttpResponse response = null;

        try {
            HttpGet request = new HttpGet(postAddr.toString());
            response = httpClient.execute(request);
            HttpEntity entity = response.getEntity();
            if (entity != null) {
                LOG.info(EntityUtils.toString(entity));
            }
            EntityUtils.consume(entity);
            ret = true;
        } catch (Exception e) {
            LOG.error("Exception when sending http request to alimonitor", e);
        } finally {
            try {
                if (response != null)
                    response.close();
                httpClient.close();
            } catch (Exception e) {
                LOG.error("Exception when closing httpclient", e);
            }
        }

        return ret;
    }

    private boolean httpPost(String url, String msg) {
        boolean ret = false;

        CloseableHttpClient httpClient = HttpClientBuilder.create().build();
        CloseableHttpResponse response = null;

        try {
            HttpPost request = new HttpPost(url);
            List<NameValuePair> nvps = new ArrayList<NameValuePair>();
            nvps.add(new BasicNameValuePair("name", monitorName));
            nvps.add(new BasicNameValuePair("msg", msg));
            request.setEntity(new UrlEncodedFormEntity(nvps));
            response = httpClient.execute(request);
            HttpEntity entity = response.getEntity();
            if (entity != null) {
                LOG.info(EntityUtils.toString(entity));
            }
            EntityUtils.consume(entity);
            ret = true;
        } catch (Exception e) {
            LOG.error("Exception when sending http request to alimonitor", e);
        } finally {
            try {
                if (response != null)
                    response.close();
                httpClient.close();
            } catch (Exception e) {
                LOG.error("Exception when closing httpclient", e);
            }
        }

        return ret;
    }


    protected Map<String, Object> convertMap(String clusterName, String topologyId, TopologyMetric tpMetric) {
    	/**
    	 * @@@ Todo
    	 */
    	return null;
    }

	@Override
	public boolean upload(String clusterName, String topologyId, TopologyMetric tpMetric, Map<String, Object> metricContext) {
		// TODO Auto-generated method stub
		Map<String, Object> metricMap = convertMap(clusterName, topologyId, tpMetric);
		if (metricMap == null || metricMap.isEmpty() == true) {
			return false;
		}
		
		try {
			sendRequest(collectionFlag, errorInfo, metricMap);
			return true;
		} catch (Exception e) {
			// TODO Auto-generated catch block
			LOG.error("Failed upload metric to Alimonitor", e);
			return false;
		}
	}

}