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.Statistics.Id;
import java.util.Locale;


/**
 * A check to see if people cheat by tricking the server to not deal them fall damage.
 *
 */
public class NoFallCheck extends MovingCheck
{
	public NoFallCheck(NoCheat plugin)
	{
		super(plugin, "moving.nofall");
	}

	/**
	 * Calculate if and how much the player "failed" this check.
	 *
	 */
	public void check(NoCheatPlayer player, MovingData data, MovingConfig cc)
	{

		// If the player is serverside in creative mode, we have to stop here to
		// avoid hurting him when he switches back to "normal" mode
		if (player.isCreative())
		{
			data.fallDistance = 0F;
			data.lastAddedFallDistance = 0F;
			return;
		}

		// This check is pretty much always a step behind for technical reasons.
		if (data.fromOnOrInGround)
		{
			// Start with zero fall distance
			data.fallDistance = 0F;
		}

		if (cc.nofallaggressive && data.fromOnOrInGround && data.toOnOrInGround && data.from.y <= data.to.y && player.getPlayer().getFallDistance() > 3.0F)
		{
			data.fallDistance = player.getPlayer().getFallDistance();
			data.nofallVL += data.fallDistance;
			incrementStatistics(player, Id.MOV_NOFALL, data.fallDistance);

			// 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.nofallActions, data.nofallVL);
			if (cancel)
			{
				player.dealFallDamage();
			}
			data.fallDistance = 0F;
		}

		// If we increased fall height before for no good reason, reduce now by
		// the same amount
		if (player.getPlayer().getFallDistance() > data.lastAddedFallDistance)
		{
			player.getPlayer().setFallDistance(player.getPlayer().getFallDistance() - data.lastAddedFallDistance);
		}

		data.lastAddedFallDistance = 0;

		// We want to know if the fallDistance recorded by the game is smaller
		// than the fall distance recorded by the plugin
		final float difference = data.fallDistance - player.getPlayer().getFallDistance();

		if (difference > 1.0F && data.toOnOrInGround && data.fallDistance > 2.0F)
		{
			data.nofallVL += difference;
			incrementStatistics(player, Id.MOV_NOFALL, difference);

			// 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.nofallActions, data.nofallVL);

			// If "cancelled", the fall damage gets dealt in a way that's
			// visible to other plugins
			if (cancel)
			{
				// Increase the fall distance a bit :)
				final float totalDistance = data.fallDistance + difference * (cc.nofallMultiplier - 1.0F);

				player.getPlayer().setFallDistance(totalDistance);
			}

			data.fallDistance = 0F;
		}

		// Increase the fall distance that is recorded by the plugin, AND set
		// the fall distance of the player
		// to whatever he would get with this move event. This modifies
		// Minecrafts fall damage calculation
		// slightly, but that's still better than ignoring players that try to
		// use "teleports" or "stepdown"
		// to avoid falldamage. It is only added for big height differences
		// anyway, as to avoid to much deviation
		// from the original Minecraft feeling.

		final double oldY = data.from.y;
		final double newY = data.to.y;

		if (oldY > newY)
		{
			final float dist = (float)(oldY - newY);
			data.fallDistance += dist;

			if (dist > 1.0F)
			{
				data.lastAddedFallDistance = dist;
				player.getPlayer().setFallDistance(player.getPlayer().getFallDistance() + dist);
			}
			else
			{
				data.lastAddedFallDistance = 0.0F;
			}
		}
		else
		{
			data.lastAddedFallDistance = 0.0F;
		}

		// Reduce falldamage violation level
		data.nofallVL *= 0.95D;

		return;
	}

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

		if (wildcard == ParameterName.VIOLATIONS)
		{
			return String.format(Locale.US, "%d", (int)getData(player).nofallVL);
		}
		else if (wildcard == ParameterName.FALLDISTANCE)
		{
			return String.format(Locale.US, "%.2f", getData(player).fallDistance);
		}
		else
		{
			return super.getParameter(wildcard, player);
		}
	}
}