package org.lfhs.klein.www;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;

import org.apache.commons.httpclient.NameValuePair;

/**
 * Provides a simple java interface to Facebook.com. Handles connecting, 
 * loading and parsing pages, and cleanly terminating that connection.
 * 
 * @author Peter Klein
 */
public class FaceBookInteractor extends WebInteractor{
	public static final String LOGIN_URL = "https://login.facebook.com/login.php";
	public static final String SEARCH_URL = "http://www.facebook.com/s.php";
	public static final int SCHOOL_ID = 33569307; 
	
	static boolean connected = false;
	static String error;
	
	private static void prep(){
		//This is why god invented constructors
		System.setProperty("org.apache.commons.logging.Log", "org.apache.commons.logging.impl.SimpleLog");
		System.setProperty ("org.apache.commons.logging.simplelog.showdatetime","true");
		System.setProperty("org.apache.commons.logging.simplelog.log.org.apache.commons.httpclient","error");
		
	}
	
	/**
	 * Connects to and logs on to Facebook.<!-- -->com. This method will return true if
	 * the login succeeded, or false if it failed. If an error occures, false
	 * will be returned, and a more detailed error report will be avalable by
	 * calling {@link #getError()}
	 * 
	 * @param email the email you wish to use to login
	 * @param pass the password you wish to use to login
	 * @return true if the login succeeded, or false if it failed
	 */
	public static boolean connect(String email, String pass){
		prep();
		
		//This lets myspace know we support cookies
		setCookie("test_cookie","1");
		
		NameValuePair[] postData = {
		    	   new NameValuePair("md5pass",""),
		    	   new NameValuePair("next",""),
		    	   new NameValuePair("email",email),
		    	   new NameValuePair("pass",pass)
		       };
		
		try {
			String results = postURL(LOGIN_URL,postData);
		} catch (IOException e) {
			error = "Problably a Socket/Connection error, make sure facebook is up";
		}
		
		/* The cookie 'xs' contains some tracking number, 
		 * and will only show up if login succeeded */
		if(!cookies.containsKey("xs")){
			error = "Make sure your login information is correct";
		} else {
			connected = true;
		}
		
		return cookies.containsKey("xs");
	}
	
	/**
	 * Given the name of a user on Facebook, will search for their ID.
	 * This method uses Facebook's search functionality. This will return
	 * the Facebook ID of the user with the name specified. If a connection
	 * error occurs, or you arent connected to begin with, -2 will be returned.
	 * If there is no user found, or more than one user found, -1 will be returned.
	 * 
	 * @param name a string representing the name to search for
	 * @return ID number. <code>-1</code>: no or too many results. <code>-2</code>: connection error or not connected.
	 */
	public static int getId(String name){
		String DIVIDER_NUM_S = "10008">";
		String DIVIDER_ID_S = "friends.php?id=";
		String DIVIDER_ID_E = "">View Friend";
		
		
		String result = "";
		if(!connected){
			error = "You must be connected to search";
			return -2;
		}
		try {
			result = getURL(SEARCH_URL + "?q=" + URLEncoder.encode(name,"UTF-8") +
					"&n=" + SCHOOL_ID);
		} catch (IOException e) {
			error = "Connection error";
			return -2;
		}
		
		//Check number of results
		if (result.indexOf("Found no results") >= 0){ //No results
			error = "Nobody found";
			return -1;
		}
		int numResults = Integer.parseInt(result.substring(
				result.indexOf(DIVIDER_NUM_S) + DIVIDER_NUM_S.length(),
				result.indexOf(DIVIDER_NUM_S) + DIVIDER_NUM_S.length()+2).trim());
		
		if (numResults > 1){ //Several results
			error = "Search found in more than one result";
			return -1;
		}
		
		int id = Integer.parseInt(result.substring(
				result.indexOf(DIVIDER_ID_S) + DIVIDER_ID_S.length(),
				result.indexOf(DIVIDER_ID_E)));
		
		
		return id;
		
	}
	
	//disconnect
	
	
	

	/**
	 * Returns the most recent failure causing error that occured.
	 * 
	 * @return a string containing details on the most recent error
	 */
	static public String getError(){
		return (error == null)? "no error (or I suck at coding)" : error;
	}
}