package com.earth2me.essentials.anticheat.checks.moving;

import com.earth2me.essentials.anticheat.NoCheat;
import com.earth2me.essentials.anticheat.NoCheatPlayer;
import com.earth2me.essentials.anticheat.actions.ParameterName;
import com.earth2me.essentials.anticheat.data.PreciseLocation;
import com.earth2me.essentials.anticheat.data.Statistics.Id;
import java.util.Locale;


/**
 * The morePacketsCheck (previously called SpeedhackCheck) will try to identify players that send more than the usual
 * amount of move-packets to the server to be able to move faster than normal, without getting caught by the other
 * checks (flying/running).
 *
 * It monitors the number of packets sent to the server within 1 second and compares it to the "legal" number of packets
 * for that timeframe (22).
 *
 */
public class MorePacketsCheck extends MovingCheck
{
	// 20 would be for perfect internet connections, 22 is good enough
	private final static int packetsPerTimeframe = 22;

	public MorePacketsCheck(NoCheat plugin)
	{
		super(plugin, "moving.morepackets");
	}

	/**
	 * 1. Players get assigned a certain amount of "free" packets as a limit initially 2. Every move packet reduces that
	 * limit by 1 3. If more than 1 second of time passed, the limit gets increased by 22 * time in seconds, up to 50
	 * and he gets a new "setback" location 4. If the player reaches limit = 0 -> teleport him back to "setback" 5. If
	 * there was a long pause (maybe lag), limit may be up to 100
	 *
	 */
	public PreciseLocation check(NoCheatPlayer player, MovingData data, MovingConfig cc)
	{

		PreciseLocation newToLocation = null;

		if (!data.morePacketsSetbackPoint.isSet())
		{
			data.morePacketsSetbackPoint.set(data.from);
		}

		long time = System.currentTimeMillis();

		// Take a packet from the buffer
		data.morePacketsBuffer--;

		// Player used up buffer, he fails the check
		if (data.morePacketsBuffer < 0)
		{

			data.morePacketsVL = -data.morePacketsBuffer;
			incrementStatistics(player, Id.MOV_MOREPACKETS, 1);

			data.packets = -data.morePacketsBuffer;

			// Execute whatever actions are associated with this check and the
			// violation level and find out if we should cancel the event
			final boolean cancel = executeActions(player, cc.morePacketsActions, data.morePacketsVL);

			if (cancel)
			{
				newToLocation = data.morePacketsSetbackPoint;
			}
		}

		if (data.morePacketsLastTime + 1000 < time)
		{
			// More than 1 second elapsed, but how many?
			double seconds = ((double)(time - data.morePacketsLastTime)) / 1000D;

			// For each second, fill the buffer
			data.morePacketsBuffer += packetsPerTimeframe * seconds;

			// If there was a long pause (maybe server lag?)
			// Allow buffer to grow up to 100
			if (seconds > 2)
			{
				if (data.morePacketsBuffer > 100)
				{
					data.morePacketsBuffer = 100;
				}
				// Else only allow growth up to 50
			}
			else
			{
				if (data.morePacketsBuffer > 50)
				{
					data.morePacketsBuffer = 50;
				}
			}

			// Set the new "last" time
			data.morePacketsLastTime = time;

			// Set the new "setback" location
			if (newToLocation == null)
			{
				data.morePacketsSetbackPoint.set(data.from);
			}
		}
		else if (data.morePacketsLastTime > time)
		{
			// Security check, maybe system time changed
			data.morePacketsLastTime = time;
		}

		return newToLocation;
	}

	@Override
	public String getParameter(ParameterName wildcard, NoCheatPlayer player)
	{

		if (wildcard == ParameterName.VIOLATIONS)
		{
			return String.format(Locale.US, "%d", (int)getData(player).morePacketsVL);
		}
		else if (wildcard == ParameterName.PACKETS)
		{
			return String.format(Locale.US, "%d", getData(player).packets);
		}
		else
		{
			return super.getParameter(wildcard, player);
		}
	}
}