Reapply potion effects to the player if he already has it

Fixes #205

Author: Sn0wStorm

src/com/dre/brewery/BEffect.java

@@ -93,7 +93,7 @@ public void apply(int quality, Player player) {
 		if (!P.use1_14) {
 			duration /= type.getDurationModifier();
 		}
-		type.createEffect(duration, lvl - 1).apply(player);
+		Util.reapplyPotionEffect(player, type.createEffect(duration, lvl - 1), true);
 	}
 
 	public int calcDuration(float quality) {

src/com/dre/brewery/BPlayer.java

@@ -497,7 +497,7 @@ public static void addQualityEffects(int quality, int brewAlc, Player player) {
 			duration *= 4;
 		}
 		if (duration > 0) {
-			PotionEffectType.POISON.createEffect(duration, 0).apply(player);
+			Util.reapplyPotionEffect(player, PotionEffectType.POISON.createEffect(duration, 0), true);
 		}
 
 		if (brewAlc > 10) {
@@ -511,7 +511,7 @@ public static void addQualityEffects(int quality, int brewAlc, Player player) {
 			if (!P.use1_14) {
 				duration *= 4;
 			}
-			PotionEffectType.BLINDNESS.createEffect(duration, 0).apply(player);
+			Util.reapplyPotionEffect(player, PotionEffectType.BLINDNESS.createEffect(duration, 0), true);
 		}
 	}
 
@@ -531,12 +531,12 @@ public void hangoverEffects(final Player player) {
 		}
 		int amplifier = getHangoverQuality() / 3;
 
-		PotionEffectType.SLOW.createEffect(duration, amplifier).apply(player);
-		PotionEffectType.HUNGER.createEffect(duration, amplifier).apply(player);
+		Util.reapplyPotionEffect(player, PotionEffectType.SLOW.createEffect(duration, amplifier), true);
+		Util.reapplyPotionEffect(player, PotionEffectType.HUNGER.createEffect(duration, amplifier), true);
 	}
 
 
-	// #### Sheduled ####
+	// #### Scheduled ####
 
 	public static void drunkeness() {
 		for (Map.Entry<String, BPlayer> entry : players.entrySet()) {

src/com/dre/brewery/Util.java

@@ -7,6 +7,8 @@
 import org.bukkit.command.CommandSender;
 import org.bukkit.configuration.ConfigurationSection;
 import org.bukkit.entity.Player;
+import org.bukkit.potion.PotionEffect;
+import org.bukkit.potion.PotionEffectType;
 
 import java.io.File;
 import java.io.FileOutputStream;
@@ -54,6 +56,26 @@ public static Player getPlayerfromString(String name) {
 		return Bukkit.getPlayerExact(name);
 	}
 
+	// Apply a Potion Effect, if player already has this effect, overwrite the existing effect.
+	// Optionally only overwrite if the new one is stronger, i.e. has higher level or longer duration
+	public static void reapplyPotionEffect(Player player, PotionEffect effect, boolean onlyIfStronger) {
+		final PotionEffectType type = effect.getType();
+		if (player.hasPotionEffect(type)) {
+			PotionEffect plEffect;
+			if (P.use1_11) {
+				plEffect = player.getPotionEffect(type);
+			} else {
+				plEffect = player.getActivePotionEffects().stream().filter(e -> e.getType().equals(type)).findAny().get();
+			}
+			if (plEffect.getAmplifier() < effect.getAmplifier() || (plEffect.getAmplifier() == effect.getAmplifier() && plEffect.getDuration() < effect.getDuration())) {
+				player.removePotionEffect(type);
+			} else {
+				return;
+			}
+		}
+		effect.apply(player);
+	}
+
 	/**********     Other Utils     **********/
 
 	// prints a list of Strings at the specified page