Main.java

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

import com.opencsv.CSVWriter;
import com.restfb.*;
import com.restfb.types.Group;
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 = "EAALA0FZC8s14BAHoSr3OBZBh5OZBmtx5AZCTWyeLP8kKR3gNsaK6YWS1gWCcaKZAQNU7GWh3b8iQIEwcld0nQFIF7azfEw0ZChMxP05idWBhd2BQNZAuY9eLKxDuhjmEboTv4ZBz7hwQDe13CeXajnNOMU4A8zNZB5niZBiDHtMuapwdRXYAvwa9mLcM5KAXWYIG8Oo4QWMD6hogZDZD";
				
		// 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);
		for(List<Group> page : userGroups) {
			for(Group currGroup : page) {
				// This loop doesn't make any sense I should replace it
				//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"));
					// 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
		 * 
		 */
		DateTimeFormatter dtf = DateTimeFormatter.ofPattern("dd.MM.yyyy");
		LocalDateTime now = LocalDateTime.now();
	    try {
	    	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 writer = new CSVWriter(outputfile);
			List<String[]> chat_data = new ArrayList<String[]>();
			chat_data.add(new String[] {"Id", "UserId", "UserName", "CreatedTime", "StatusType", "Message", "Story", "Link", "Picture"});

	    	for(List<Post> getPosts : postFeed) {
				//Create a list of posts from the post feed Y
				for(Post currPost : getPosts) {
					chat_data.add(new String[] {currPost.getId(), currPost.getFrom().getId(), currPost.getFrom().getName(), "Date", currPost.getType(), currPost.getMessage(), currPost.getStory(), currPost.getLink(), currPost.getPicture()});	
				}
			}
	    	writer.writeAll(chat_data);
	    	writer.close();
		       
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	} 

}