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.checks.CheckUtil;
import com.earth2me.essentials.anticheat.config.Permissions;
import com.earth2me.essentials.anticheat.data.PreciseLocation;
import com.earth2me.essentials.anticheat.data.Statistics.Id;
import java.util.Locale;
import org.bukkit.Material;
import org.bukkit.block.Block;


/**
 * The counterpart to the FlyingCheck. People that are not allowed to fly get checked by this. It will try to identify
 * when they are jumping, check if they aren't jumping too high or far, check if they aren't moving too fast on normal
 * ground, while sprinting, sneaking or swimming.
 *
 */
public class RunningCheck extends MovingCheck
{
	private final static double maxBonus = 1D;
	// How many move events can a player have in air before he is expected to
	// lose altitude (or eventually land somewhere)
	private final static int jumpingLimit = 6;
	private final NoFallCheck noFallCheck;

	public RunningCheck(NoCheat plugin)
	{

		super(plugin, "moving.running");

		this.noFallCheck = new NoFallCheck(plugin);
	}

	public PreciseLocation check(NoCheatPlayer player, MovingData data, MovingConfig cc)
	{

		// Some shortcuts:
		final PreciseLocation setBack = data.runflySetBackPoint;
		final PreciseLocation to = data.to;
		final PreciseLocation from = data.from;

		// Calculate some distances
		final double xDistance = data.to.x - from.x;
		final double zDistance = to.z - from.z;
		final double horizontalDistance = Math.sqrt((xDistance * xDistance + zDistance * zDistance));

		if (!setBack.isSet())
		{
			setBack.set(from);
		}

		// To know if a player "is on ground" is useful
		final int fromType = CheckUtil.evaluateLocation(player.getPlayer().getWorld(), from);
		final int toType = CheckUtil.evaluateLocation(player.getPlayer().getWorld(), to);

		final boolean fromOnGround = CheckUtil.isOnGround(fromType);
		final boolean fromInGround = CheckUtil.isInGround(fromType);
		final boolean toOnGround = CheckUtil.isOnGround(toType);
		final boolean toInGround = CheckUtil.isInGround(toType);

		PreciseLocation newToLocation = null;

		final double resultHoriz = Math.max(0.0D, checkHorizontal(player, data, CheckUtil.isLiquid(fromType) && CheckUtil.isLiquid(toType), horizontalDistance, cc));
		final double resultVert = Math.max(0.0D, checkVertical(player, data, fromOnGround, toOnGround, cc));

		final double result = (resultHoriz + resultVert) * 100;

		data.jumpPhase++;

		// Slowly reduce the level with each event
		data.runflyVL *= 0.95;

		// Did the player move in unexpected ways?
		if (result > 0)
		{
			// Increment violation counter
			data.runflyVL += result;

			incrementStatistics(player, data.statisticCategory, result);

			boolean cancel = executeActions(player, cc.actions, data.runflyVL);

			// Was one of the actions a cancel? Then do it
			if (cancel)
			{
				newToLocation = setBack;
			}
			else if (toOnGround || toInGround)
			{
				// In case it only gets logged, not stopped by NoCheat
				// Update the setback location at least a bit
				setBack.set(to);
				data.jumpPhase = 0;

			}
		}
		else
		{
			// Decide if we should create a new setBack point
			// These are the result of a lot of bug reports, experience and
			// trial and error

			if ((toInGround && from.y >= to.y) || CheckUtil.isLiquid(toType))
			{
				// Yes, if the player moved down "into" the ground or into liquid
				setBack.set(to);
				setBack.y = Math.ceil(setBack.y);
				data.jumpPhase = 0;
			}
			else if (toOnGround && (from.y >= to.y || setBack.y <= Math.floor(to.y)))
			{
				// Yes, if the player moved down "onto" the ground and the new
				// setback point is higher up than the old or at least at the
				// same height
				setBack.set(to);
				setBack.y = Math.floor(setBack.y);
				data.jumpPhase = 0;
			}
			else if (fromOnGround || fromInGround || toOnGround || toInGround)
			{
				// The player at least touched the ground somehow
				data.jumpPhase = 0;
			}
		}

		/**
		 * ******* EXECUTE THE NOFALL CHECK *******************
		 */
		final boolean checkNoFall = cc.nofallCheck && !player.hasPermission(Permissions.MOVING_NOFALL);

		if (checkNoFall && newToLocation == null)
		{
			data.fromOnOrInGround = fromOnGround || fromInGround;
			data.toOnOrInGround = toOnGround || toInGround;
			noFallCheck.check(player, data, cc);
		}

		return newToLocation;
	}

	/**
	 * Calculate how much the player failed this check
	 *
	 */
	private double checkHorizontal(final NoCheatPlayer player, final MovingData data, final boolean isSwimming, final double totalDistance, final MovingConfig cc)
	{

		// How much further did the player move than expected??
		double distanceAboveLimit = 0.0D;

		// A player is considered sprinting if the flag is set and if he has
		// enough food level (configurable)
		final boolean sprinting = player.isSprinting() && (player.getPlayer().getFoodLevel() > 5);

		double limit = 0.0D;

		Id statisticsCategory = null;

		// Player on ice? Give him higher max speed
		Block b = player.getPlayer().getLocation().getBlock();
		if (b.getType() == Material.ICE || b.getRelative(0, -1, 0).getType() == Material.ICE)
		{
			data.onIce = 20;
		}
		else if (data.onIce > 0)
		{
			data.onIce--;
		}

		if (cc.sneakingCheck && player.getPlayer().isSneaking() && !player.hasPermission(Permissions.MOVING_SNEAKING))
		{
			limit = cc.sneakingSpeedLimit;
			statisticsCategory = Id.MOV_SNEAKING;
		}
		else if (isSwimming && !player.hasPermission(Permissions.MOVING_SWIMMING))
		{
			limit = cc.swimmingSpeedLimit;
			statisticsCategory = Id.MOV_SWIMMING;
		}
		else if (!sprinting)
		{
			limit = cc.walkingSpeedLimit;
			statisticsCategory = Id.MOV_RUNNING;
		}
		else
		{
			limit = cc.sprintingSpeedLimit;
			statisticsCategory = Id.MOV_RUNNING;
		}

		if (data.onIce > 0)
		{
			limit *= 2.5;
		}

		// Taken directly from Minecraft code, should work
		limit *= player.getSpeedAmplifier();

		distanceAboveLimit = totalDistance - limit - data.horizFreedom;

		data.bunnyhopdelay--;

		// Did he go too far?
		if (distanceAboveLimit > 0 && sprinting)
		{

			// Try to treat it as a the "bunnyhop" problem
			if (data.bunnyhopdelay <= 0 && distanceAboveLimit > 0.05D && distanceAboveLimit < 0.4D)
			{
				data.bunnyhopdelay = 9;
				distanceAboveLimit = 0;
			}
		}

		if (distanceAboveLimit > 0)
		{
			// Try to consume the "buffer"
			distanceAboveLimit -= data.horizontalBuffer;
			data.horizontalBuffer = 0;

			// Put back the "overconsumed" buffer
			if (distanceAboveLimit < 0)
			{
				data.horizontalBuffer = -distanceAboveLimit;
			}
		}
		// He was within limits, give the difference as buffer
		else
		{
			data.horizontalBuffer = Math.min(maxBonus, data.horizontalBuffer - distanceAboveLimit);
		}

		if (distanceAboveLimit > 0)
		{
			data.statisticCategory = statisticsCategory;
		}

		return distanceAboveLimit;
	}

	/**
	 * Calculate if and how much the player "failed" this check.
	 *
	 */
	private double checkVertical(final NoCheatPlayer player, final MovingData data, final boolean fromOnGround, final boolean toOnGround, final MovingConfig cc)
	{

		// How much higher did the player move than expected??
		double distanceAboveLimit = 0.0D;

		// Potion effect "Jump"
		double jumpAmplifier = player.getJumpAmplifier();
		if (jumpAmplifier > data.lastJumpAmplifier)
		{
			data.lastJumpAmplifier = jumpAmplifier;
		}

		double limit = data.vertFreedom + cc.jumpheight;

		limit *= data.lastJumpAmplifier;

		if (data.jumpPhase > jumpingLimit + data.lastJumpAmplifier)
		{
			limit -= (data.jumpPhase - jumpingLimit) * 0.15D;
		}

		distanceAboveLimit = data.to.y - data.runflySetBackPoint.y - limit;

		if (distanceAboveLimit > 0)
		{
			data.statisticCategory = Id.MOV_FLYING;
		}

		if (toOnGround || fromOnGround)
		{
			data.lastJumpAmplifier = 0;
		}

		return distanceAboveLimit;
	}

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

		if (wildcard == ParameterName.CHECK)
		// Workaround for something until I find a better way to do it
		{
			return getData(player).statisticCategory.toString();
		}
		else if (wildcard == ParameterName.VIOLATIONS)
		{
			return String.format(Locale.US, "%d", (int)getData(player).runflyVL);
		}
		else
		{
			return super.getParameter(wildcard, player);
		}
	}
}