/* Author: Alessandro Pellegrini <alessandro.pellegrini@tin.it>
 * This class posts a Birthday Thank you on your Facebook wall
 * You must donwload Facebook4J for this to work.
 * Before running this script, log in to Facebook!
 * You must configure static variables in the class for it to work correctly!
 * Compile with:
 * javac -cp facebook4j-core-2.0.4.jar BirthdayThanks.java
 * Run with (on Windows):
 * java -cp facebook4j-core-2.0.4.jar;. BirthdayThanks
 * Check if the Facebook4J core jar has the correct name!
 * There is a dryRun flag which prevents the program from actually posting
 * to your Facebook wall. Set it to false after having tried its behaviour!
 * ...and Happy Birthday! :)
 */


import facebook4j.Facebook;
import facebook4j.FacebookException;
import facebook4j.FacebookFactory;
import facebook4j.ResponseList;
import facebook4j.Post;
import facebook4j.Reading;
import facebook4j.auth.AccessToken;

public class BirthdayThanks {
	
	// Get an access token from https://developers.facebook.com/tools/explorer
	// You must specify the following permissions when getting the token:
	// read_stream, publish_actions, publish_stream
	private static final String accessTokenString = "TOKEN HERE!";
	
	// This is the reply that will be posted to your birthday posts
	private static final String ThankYouMessage = "Thank you %s! :)";
	
	// If this flag is set to 'true', then the first name of the sender will be added to the thank you string.
	// Note that, for this to work, a %s must be placed in ThankYouMessage where the name should appear.
	// The first name is obtained as the first token in the poster name. So, if the name is 'My Long Name',
	// %s will be replaced with My.
	private static final boolean addName = true;
	
	// This is the text that will be searched for in the posts (case insensitive)
	// You can add as many as you want!
	private static final String[] HBtext = {"auguri", "compleanno", "auguroni", "birthday", "bday"};
	
	// This is to set your birthday. I will look all posts one day before and one day after your birthday (GMT time)
	private static final int bYear  = 2014;
	private static final int bMonth = 1;
	private static final int bDay   = 7;
	
	// If this flag is set to 'true', the prorgam will execute a dry run, i.e. no actual
	// reply will be posted on you Facebook wall!
	private static final boolean dryRun = true;

	
	/********************************************/
	/** DO NOT TOUCH ANYTHING BELOW THIS LINE! **/
	/********************************************/
	
	
	public static void main (String[] args) throws FacebookException {

		ResponseList<Post> posts = null;

		// Generate facebook instance.
		Facebook facebook = new FacebookFactory().getInstance();
		// Use default values for oauth app id.
		facebook.setOAuthAppId("", "");
		// Set access token.
		AccessToken at = new AccessToken(accessTokenString);
		facebook.setOAuthAccessToken(at);
		
		// Get relevant posts
		System.out.println("Retrieving posts...");
		Reading r = new Reading();
		r.until(bYear + "-" + bMonth + "-" + (bDay+1) + "T00:00:00+0000");
		r.since(bYear + "-" + bMonth + "-" + (bDay-1) + "T00:00:00+0000");
		r.limit(1000); // Ok, this is a bit too much maybe! :)
		posts = facebook.getFeed(r);

		// Loop on them
		int i = 0;
		for(Post t:posts) {
			
			if(t.getMessage() == null)
				continue;
			
			if(haveToThank(t.getMessage())) {
				String thankString;
				if(addName) {
					String[] currName = t.getFrom().getName().split(" ");
					thankString = String.format(ThankYouMessage, currName[0]);
				} else {
					thankString = ThankYouMessage;
				}
				System.out.println(++i + ". Thanking " + t.getFrom().getName() + " for post \"" + t.getMessage().substring(0, Math.min(t.getMessage().length(), 20)) + "\" with message \"" + thankString + "\"");

				if(!dryRun) {
					facebook.commentPost(t.getId(), thankString);
					try {
						Thread.sleep(1500);
					} catch (InterruptedException e) {}
				}
			}
		}
		
		System.out.println("Done.");
	}


	private static boolean haveToThank(String p){
		
		for(String s:HBtext) {
			if(p.toLowerCase().indexOf(s.toLowerCase()) != -1) {
				return true;
			}
		}
		
		return false;
	}
}