/*
 * Created on 2/Jun/2004
 *  
 */
package net.sourceforge.fenixedu.applicationTier.utils;

import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;

import net.sourceforge.fenixedu._development.PropertiesManager;
import net.sourceforge.fenixedu.applicationTier.utils.exceptions.FenixUtilException;
import net.sourceforge.fenixedu.applicationTier.utils.exceptions.SmsSendUtilException;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpMethod;
import org.apache.commons.httpclient.NameValuePair;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.util.EncodingUtil;

/**
 * @author <a href="mailto:sana@ist.utl.pt">Shezad Anavarali </a>
 * @author <a href="mailto:naat@ist.utl.pt">Nadir Tarmahomed </a>
 * 
 */
public class SmsUtil {
    private static SmsUtil _instance = null;

    private String host;

    private int port;

    private String uri;

    private String protocol;

    private String username;

    private String password;

    private int monthlySmsLimit;

    private String deliveryUsername;

    private String deliveryPassword;

    private String deliveryHost;

    private int deliveryPort;

    private String deliveryUri;

    private String deliveryProtocol;

    public static synchronized SmsUtil getInstance() {
	if (_instance == null) {
	    _instance = new SmsUtil();
	}

	return _instance;
    }

    /**
     * Default constructor (reads "/SMSCofiguration.properties")
     */
    private SmsUtil() {
	this.host = PropertiesManager.getProperty("sms.gateway.host");
	this.uri = PropertiesManager.getProperty("sms.gateway.uri");
	this.port = (Integer.valueOf(PropertiesManager.getProperty("sms.gateway.port"))).intValue();
	this.protocol = PropertiesManager.getProperty("sms.gateway.protocol");
	this.username = PropertiesManager.getProperty("sms.gateway.username").trim();
	this.password = PropertiesManager.getProperty("sms.gateway.password").trim();
	this.monthlySmsLimit = (Integer.valueOf(PropertiesManager.getProperty("monthlySmsLimit"))).intValue();
	this.deliveryUsername = PropertiesManager.getProperty("sms.delivery.username").trim();
	this.deliveryPassword = PropertiesManager.getProperty("sms.delivery.password").trim();
	this.deliveryHost = PropertiesManager.getProperty("sms.delivery.host");
	this.deliveryPort = (Integer.valueOf(PropertiesManager.getProperty("sms.delivery.port"))).intValue();
	this.deliveryUri = PropertiesManager.getProperty("sms.delivery.uri");
	this.deliveryProtocol = PropertiesManager.getProperty("sms.delivery.protocol");
    }

    /**
     * 
     * Send a Sms with delivery report support (The gateway will update da
     * SentSms with Id=smsId)
     * 
     * @param destinationPhoneNumber
     * @param message
     * @param smsId
     * @throws FenixUtilException
     */
    public void sendSms(Integer destinationPhoneNumber, String message, Integer smsId) throws FenixUtilException {

	HttpClient client = new HttpClient();
	client.getHostConfiguration().setHost(this.host, this.port, this.protocol);
	HttpMethod httpMethod = new GetMethod(this.uri);

	NameValuePair deliveryUsername = new NameValuePair("deliveryUsername", this.deliveryUsername);
	NameValuePair deliveryPassword = new NameValuePair("deliveryPassword", this.deliveryPassword);
	NameValuePair deliveryMethod = new NameValuePair("method", "updateDeliveryReport");
	NameValuePair deliverySmsId = new NameValuePair("smsId", smsId.toString());

	String deliveryQuery = EncodingUtil.formUrlEncode(new NameValuePair[] { deliveryUsername, deliveryPassword,
		deliverySmsId, deliveryMethod }, "8859_1")
		+ "&deliveryType=%d";

	URL url = null;
	try {
	    url = new URL(this.deliveryProtocol, this.deliveryHost, this.deliveryPort, this.deliveryUri);
	} catch (MalformedURLException e2) {
	    throw new SmsSendUtilException();
	}

	String deliveryUrl = url.toExternalForm() + "?" + deliveryQuery;

	NameValuePair username = new NameValuePair("username", this.username);
	NameValuePair password = new NameValuePair("password", this.password);
	NameValuePair to = new NameValuePair("to", destinationPhoneNumber.toString());
	NameValuePair text = new NameValuePair("text", message);
	NameValuePair dlrmaks = new NameValuePair("dlrmask", "31");
	NameValuePair dlrurl = new NameValuePair("dlrurl", deliveryUrl);

	String query = EncodingUtil
		.formUrlEncode(new NameValuePair[] { username, password, to, text, dlrmaks, dlrurl }, "8859_1");

	httpMethod.setQueryString(query);

	try {
	    client.executeMethod(httpMethod);

	    String result = httpMethod.getResponseBodyAsString();
	    System.err.println(result);

	    httpMethod.releaseConnection();

	    if (result.equals("Sent.") == false) {
		throw new SmsSendUtilException();
	    }

	} catch (HttpException e) {
	    throw new SmsSendUtilException();
	} catch (IOException e) {
	    throw new SmsSendUtilException();
	}

    }

    /**
     * 
     * Send a Sms without delivery report support
     * 
     * @param destinationPhoneNumber
     * @param message
     * @param smsId
     * @throws FenixUtilException
     */
    public void sendSmsWithoutDeliveryReports(Integer destinationPhoneNumber, String message) throws FenixUtilException {

	HttpClient client = new HttpClient();
	client.getHostConfiguration().setHost(this.host, this.port, this.protocol);
	HttpMethod httpMethod = new GetMethod(this.uri);

	NameValuePair username = new NameValuePair("username", this.username);
	NameValuePair password = new NameValuePair("password", this.password);
	NameValuePair to = new NameValuePair("to", destinationPhoneNumber.toString());
	NameValuePair text = new NameValuePair("text", message);

	String query = EncodingUtil.formUrlEncode(new NameValuePair[] { username, password, to, text }, "8859_1");

	httpMethod.setQueryString(query);

	try {
	    client.executeMethod(httpMethod);

	    String result = httpMethod.getResponseBodyAsString();
	    System.err.println(result);

	    httpMethod.releaseConnection();

	    if (result.equals("Sent.") == false) {
		throw new SmsSendUtilException();
	    }

	} catch (HttpException e) {
	    throw new SmsSendUtilException();
	} catch (IOException e) {
	    throw new SmsSendUtilException();
	}

    }

    /**
     * 
     * @param responseMessage
     * @param responseLenght
     * @return
     */
    public List splitMessage(StringBuilder message, int messageLenght) {
	List responseMessagesList = new ArrayList();
	while (message.length() > messageLenght) {

	    responseMessagesList.add(message.substring(0, messageLenght));
	    message.delete(0, messageLenght);

	}
	responseMessagesList.add(message.toString());

	return responseMessagesList;
    }

    /**
     * @return Returns the monthlySmsLimit.
     */
    public int getMonthlySmsLimit() {
	return monthlySmsLimit;
    }

    /**
     * @return Returns the host.
     */
    public String getHost() {
	return host;
    }

    /**
     * @return Returns the deliveryPassword.
     */
    public String getDeliveryPassword() {
	return deliveryPassword;
    }

    /**
     * @return Returns the deliveryUsername.
     */
    public String getDeliveryUsername() {
	return deliveryUsername;
    }

}