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package com.sc.utils.rest.httpClient;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpConnectionManager;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpMethod;
import org.apache.commons.httpclient.MultiThreadedHttpConnectionManager;
import org.apache.commons.httpclient.NameValuePair;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.methods.multipart.FilePart;
import org.apache.commons.httpclient.methods.multipart.FilePartSource;
import org.apache.commons.httpclient.methods.multipart.MultipartRequestEntity;
import org.apache.commons.httpclient.methods.multipart.Part;
import org.apache.commons.httpclient.methods.multipart.StringPart;
import org.apache.commons.httpclient.params.HttpMethodParams;
import org.apache.commons.httpclient.util.IdleConnectionTimeoutThread;

import java.io.File;
import java.io.IOException;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.List;


public class HttpProtocolHandler {

    
    private static final long defaultHttpConnectionManagerTimeout = 3 * 1000;
    private static String DEFAULT_CHARSET = "GBK";
    private static HttpProtocolHandler httpProtocolHandler = new HttpProtocolHandler();
    
    private int defaultConnectionTimeout = 8000;
    
    private int defaultSoTimeout = 30000;
    
    private int defaultIdleConnTimeout = 60000;
    private int defaultMaxConnPerHost = 30;
    private int defaultMaxTotalConn = 80;
    
    private HttpConnectionManager connectionManager;

    
    private HttpProtocolHandler() {
        
        connectionManager = new MultiThreadedHttpConnectionManager();
        connectionManager.getParams().setDefaultMaxConnectionsPerHost(defaultMaxConnPerHost);
        connectionManager.getParams().setMaxTotalConnections(defaultMaxTotalConn);

        IdleConnectionTimeoutThread ict = new IdleConnectionTimeoutThread();
        ict.addConnectionManager(connectionManager);
        ict.setConnectionTimeout(defaultIdleConnTimeout);

        ict.start();
    }

    
    public static HttpProtocolHandler getInstance() {
        return httpProtocolHandler;
    }

    
    public HttpResponse execute(HttpRequest request, String strParaFileName, String strFilePath) throws HttpException, IOException {
        HttpClient httpclient = new HttpClient(connectionManager);

        
        int connectionTimeout = defaultConnectionTimeout;
        if (request.getConnectionTimeout() > 0) {
            connectionTimeout = request.getConnectionTimeout();
        }
        httpclient.getHttpConnectionManager().getParams().setConnectionTimeout(connectionTimeout);

        
        int soTimeout = defaultSoTimeout;
        if (request.getTimeout() > 0) {
            soTimeout = request.getTimeout();
        }
        httpclient.getHttpConnectionManager().getParams().setSoTimeout(soTimeout);

        
        httpclient.getParams().setConnectionManagerTimeout(defaultHttpConnectionManagerTimeout);

        String charset = request.getCharset();
        charset = charset == null ? DEFAULT_CHARSET : charset;
        HttpMethod method = null;

        
        if (request.getMethod().equals(HttpRequest.METHOD_GET)) {
            method = new GetMethod(request.getUrl());
            method.getParams().setCredentialCharset(charset);

            
            method.setQueryString(request.getQueryString());
        } else if (strParaFileName.equals("") && strFilePath.equals("")) {
            
            method = new PostMethod(request.getUrl());
            ((PostMethod) method).addParameters(request.getParameters());
            method.addRequestHeader("Content-Type", "application/x-www-form-urlencoded; text/html; charset=" + charset);
        } else {
            
            method = new PostMethod(request.getUrl());
            List parts = new ArrayList();
            for (int i = 0; i < request.getParameters().length; i++) {
                parts.add(new StringPart(request.getParameters()[i].getName(), request.getParameters()[i].getValue(), charset));
            }
            
            parts.add(new FilePart(strParaFileName, new FilePartSource(new File(strFilePath))));

            
            ((PostMethod) method).setRequestEntity(new MultipartRequestEntity(parts.toArray(new Part[0]), new HttpMethodParams()));
        }

        
        method.addRequestHeader("User-Agent", "Mozilla/4.0");
        HttpResponse response = new HttpResponse();

        try {
            httpclient.executeMethod(method);
            if (request.getResultType().equals(HttpResultType.STRING)) {
                response.setStringResult(method.getResponseBodyAsString());
            } else if (request.getResultType().equals(HttpResultType.BYTES)) {
                response.setByteResult(method.getResponseBody());
            }
            response.setResponseHeaders(method.getResponseHeaders());
        } catch (UnknownHostException ex) {

            return null;
        } catch (IOException ex) {

            return null;
        } catch (Exception ex) {

            return null;
        } finally {
            method.releaseConnection();
        }
        return response;
    }

    
    protected String toString(NameValuePair[] nameValues) {
        if (nameValues == null || nameValues.length == 0) {
            return "null";
        }

        StringBuffer buffer = new StringBuffer();

        for (int i = 0; i < nameValues.length; i++) {
            NameValuePair nameValue = nameValues[i];

            if (i == 0) {
                buffer.append(nameValue.getName() + "=" + nameValue.getValue());
            } else {
                buffer.append("&" + nameValue.getName() + "=" + nameValue.getValue());
            }
        }

        return buffer.toString();
    }
}