package de.mrbesen.youtubecrawler;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Random;
import java.util.Scanner;

import org.apache.log4j.Logger;

import de.mrbesen.telegram.MessageBuilder;
import de.mrbesen.telegram.TelegramAPI;
import de.mrbesen.telegram.commands.JSONCommandHandler;
import de.mrbesen.telegram.event.events.UserSendMessageEvent;
import de.mrbesen.telegram.log.Log4JLog;
import de.mrbesen.telegram.objects.TMessage;
import de.mrbesen.telegram.objects.TUser;

public class Main implements JSONCommandHandler {

	private ArrayList<Long> admins = new ArrayList<>();//userids of admins
	private String adminstr = null;
	private long setadminstr = -1;
	private static final String abc = "abcdefghijklmnopqrstuvwxyz";//used for random string generation
	private Logger log = Logger.getLogger(this.getClass().getName());
	private TelegramAPI tapi;
	private Thread mainthread;
	private static Main main;
	private boolean startcrawler = true;
	private Crawler cra;
	private Thread maincrawlerthread;

	public static Main getMain() {
		return main;
	}

	public static void main(String[] args) {
		boolean startcrawl = true;
		for(String arg : args) {
			if(arg.equalsIgnoreCase("--nocrawl")) {
				startcrawl = false;
			}
		}

		main = new Main(startcrawl);
		main.run();
	}

	public Main(boolean startcra) {
		startcrawler = startcra;
	}

	private void run() {
		mainthread = Thread.currentThread();

		//init Logger
		new Log(); // init logging, set format etc
		Logger log = Logger.getLogger(Main.class.getName());

		//loading config
		new Config(new File("crawl.conf"));

		//starting crawler
		cra = new Crawler();
		maincrawlerthread = new Thread(cra, "Crawler");
		if(startcrawler) {
			maincrawlerthread.start();
		}

		//starting BOT API
		tapi = new TelegramAPI(Config.prop.getProperty("telegramapi.key"));
		tapi.getCommandManager().registerCommand( this);
		tapi.getEventManager().registerEvent(UserSendMessageEvent.class, this::onAdmin);
		tapi.setHelpText("Send the command /random to get a random video.");
		tapi.setUpdateInterval(60);
		tapi.setLongpolling(true);
		tapi.setLog(new Log4JLog());
		tapi.start();

		//load admins
		Log.l.info("Loading admins.");
		try {
			Scanner scan = new Scanner(new File("admins"));
			while(scan.hasNext()) {
				String line = scan.nextLine().trim();
				if(!line.isEmpty()) {
					try {
						admins.add(Long.parseLong(line));
					} catch(NumberFormatException e) {
						e.printStackTrace();
					}
				}
			}
			scan.close();
		} catch (IOException | NumberFormatException | ArrayIndexOutOfBoundsException e) {
			e.printStackTrace();
		}
		//CLI
		Scanner s = new Scanner(System.in);
		String in;
		while((in = s.nextLine()) != null && maincrawlerthread.isAlive()) {
			if(in.equalsIgnoreCase("stop")) {
				stop();
			} else if(in.equalsIgnoreCase("add")) {
				log.info("please enter ytid:");
				String id = s.nextLine().trim();
				if(id.length() > 9 && id.length() < 13) {
					cra.addtoCrawl(id);
					log.info("added.");
				}
			} else if(in.equalsIgnoreCase("stats")) {
				log.info("Getting Stats");
				for(String line : cra.getStats().split("\n")) {
					log.info(line);
				}
			} else if(in.equalsIgnoreCase("crastop")) {
				log.info("Stop crawler");
				startcrawler = false;
				cra.stop();
			} else if(in.equalsIgnoreCase("profiler")) {
				for(String profline : cra.getProfiling()) {
					log.info(profline);
				}
			}
		}
		s.close();
		log.info("Terminated.");
	}

	private String format(String in, int length) {
		while(in.length() < length) {
			in += ' ';
		}

		if(in.length() > length) {
			in = in.substring(0, length);
		}
		return in;
	}

	public void stop() {
		log.info("Stop.");
		cra.stop();
		if(!startcrawler) {//crawler not running
			cra.getDB().stop();
			tapi.stop();
		}
	}

	void stopcallback() {
		if(startcrawler) {//crawler should run
			tapi.stop();
			cra.getDB().stop();
			mainthread.interrupt();
		}
	}

	@Override
	public boolean onCommand(TUser sender, String cmd, String[] args, TMessage json) {
		if(cmd.startsWith("random")) {
			String ytid = cra.getDB().getRandom();
			long chatid = json.getChatID();

			tapi.sendMessage(new MessageBuilder().setAsync().setText("https://youtube.com/watch?v=" + ytid).setReciver(chatid).build());

			return true;
		} else if(cmd.equals("admin")) {
			if(admins.contains(sender.getID())) {
				sender.sendMessage("You are admin.");
				return true;
			} else {
				adminstr = getRandomStr(8);
				setadminstr = System.currentTimeMillis();
				log.info("Adminstr: " + adminstr);
			}
		} else if(cmd.equals("stats")) {
			if(admins.contains(sender.getID())) {
				sender.sendMessage(cra.getStats());
				return true;
			}
		} else if(cmd.equals("profiler")) {
			if(admins.contains(sender.getID())) {
				StringBuilder sb = new StringBuilder();
				for(String s : cra.getProfiling()) {
					sb.append(s).append('\n');
				}
				if(sb.length() == 0)
					sb.append("No Data.");
				sender.sendMessage(sb.toString());
				return true;
			}
		}

		/*else if(cmd.equals("stop")) {
			if(admins.contains(sender.getName())) {
				stop();
				sender.sendMessage("Stop.");
				log.info("Stopped via Telegram by " + sender.getFirstName());
				return true;
			}
		}*/
		return false;
	}

	public void broadcastAdmin(String msg) {
		for(long admin : admins) {
			if(admin != 0) {
				MessageBuilder mb = new MessageBuilder().setAsync().setText(msg).setReciver(admin);
				tapi.sendMessage(mb.build());
			}
		}
	}

	private static String getRandomStr(int length) {
		Random rand = new Random();
		String out = "";
		for(int i = 0; i < length; i++) {
			out += abc.charAt(rand.nextInt(abc.length()));
		}
		return out;
	}

	public void onAdmin(Object event) {
		UserSendMessageEvent e = (UserSendMessageEvent) event;
		if(adminstr != null && setadminstr > 0) {
			if(e.getMessage() != null && (System.currentTimeMillis() - setadminstr) / 1000 < 60) {
				if(e.getMessage().getText() != null) {
					if(e.getMessage().getText().equals(adminstr)) {
						admins.add(e.getUser().getID());
						e.getMessage().reply("You are now Admin!");
						adminstr = null;
						setadminstr = -1;
						log.info(e.getUser().getID() + " " + e.getUser().getName() + " " + e.getUser().getFirstName() + " is now Admin!");
					}
				}
			}
		}
	}
}