Main.java

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Scanner;

import com.opencsv.CSVWriter;
import com.restfb.*;
import com.restfb.types.Group;
import com.restfb.types.Likes;
import com.restfb.types.Post;

/**
 * TODO: 
 * Facebook authentication (no more temporary access codes)
 * GUI
 *
 */

public class Main {
	/** 
	 * @param args the command line arguments
	 */
	public static void main(String[] args) {
		
		String accessToken = "EAALA0FZC8s14BACP7C9wRohgnBbgGbMmmCnZBjPDcQbGf6ZA1oro7vyZB9ABBYyjKEABrOZA8UNT7rhTW9CDzEZANKzxPdD3JKkbCcL6KpiUmke0gXLIxbE23ZCn91hECSF8VH0oWDPtGeA2Hxmcp6erocnSiQMCFYiY5LHPvJQefNPci5m13QHKE00z2GybB4cIu4mnpZBOJwZDZD";
		// Token expires daily - facebook auth needed for permanent one or app needs to login with facebook
		Scanner input = new Scanner(System.in);
		
		FacebookClient fbClient = new DefaultFacebookClient(accessToken, Version.VERSION_3_1);
		
		Connection<Group> userGroups = fbClient.fetchConnection("me/groups", Group.class);
		//get the iterator
		Iterator<List<Group>> groupIt = userGroups.iterator();
		while(groupIt.hasNext()) {
			List<Group> page = groupIt.next();
			for(Group currGroup : page) {
				
				//System.out.println("Do you want to get posts from "+currGroup.getName()+" ? Yes/NO"); // Eventually switch to GUI
				//String response = input.nextLine();
				//if(response.equals("Yes")) {
				// Removed above lines for testing (will need them in the future but not now since I'm only testing on one group)
				if(currGroup.getId().equals("250530099176185")){
					Connection<Post> postFeed = fbClient.fetchConnection(currGroup.getId()+"/feed", Post.class, Parameter.with("fields","from,actions,message,likes,reactions,story,type,link,picture,created_time"));
					// Note - ask Jess if they want to be able to specify a start date / end date when pulling data
					writeCSVData(currGroup, postFeed);
				}
			}
		}
		input.close();
		
				
	}
	public static void writeCSVData(Group currGroup, Connection<Post> postFeed) 
	{ 
		// TODO - Finish
		// File Name should be of format: Health Chat_Data Type_Group Name_Date Pulled.csv
		/* Files needed:
		 * comments - headers: PostId, Id, UserId, UserName, CreatedTime, Message
		 * chat_feed - headers: Id, UserId, UserName, CreatedTime, Status Type, Message, Story, Link, Picture
		 * likes - headers: ObjectId, UserId, UserName
		 * reactions - headers: ObjectId, UserId, UserName, Type
		 * shares - headers: Id, UserId, UserName, CreatedTime, StatusType, Message, Story, Link, Picture
		 * 
		 */
		Iterator<List<Post>> it = postFeed.iterator();
		DateTimeFormatter dtf = DateTimeFormatter.ofPattern("dd.MM.yyyy hh.mm.ss");
		LocalDateTime now = LocalDateTime.now();
        DateFormat csvDateFormat = new SimpleDateFormat("yyyy-mm-dd hh:mm:ss");  
	    try {
	    	// Should first create a folder then put all of these files in that folder with the date
	    	File file = new File("Health Chat_chat_feed_"+currGroup.getName()+"_"+dtf.format(now)+".csv"); // Filepath needs to be more specific in final
	    	FileWriter outputfile = new FileWriter(file);
		    // create CSVWriter object filewriter object as parameter 
			CSVWriter chatWriter = new CSVWriter(outputfile);
			List<String[]> chat_data = new ArrayList<String[]>();
			chat_data.add(new String[] {"Id", "UserId", "UserName", "CreatedTime", "StatusType", "Message", "Story", "Link", "Picture"});

	    	while(it.hasNext()) {
	    		List<Post> feedPage = it.next();
				//Create a list of posts from the post feed Y
				for(Post currPost : feedPage) {
					String id = currPost.getId();
					String UserId = currPost.getFrom().getId();
					String UserName = currPost.getFrom().getName();
					String CreatedTime = csvDateFormat.format(currPost.getCreatedTime());
					String type = currPost.getType();
					String message = currPost.getMessage();
					String story = currPost.getStory();
					String link = "fb.com/"+id;
					String pic = currPost.getPicture();
					
					//IF post isnt shared, add to chat_data file
					chat_data.add(new String[] {id,UserId,UserName,CreatedTime,type,message,story,link,pic});
					//else add to shares file
					if(currPost.getLikesCount() > 0) {
						//add to the likes.csv file
					}
					if (currPost.getReactionsCount() > 0) {
						//add to the reactions.csv file
					}
					if (currPost.getCommentsCount() > 0) {
						//add to the comments.csv file
					}
				}
			}
	    	chatWriter.writeAll(chat_data);
	    	chatWriter.close();
		       
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	} 

}