Tier rolling cleanup

src/main/java/net/Indyuce/mmocore/loot/chest/LootChestRegion.java

@@ -14,6 +14,7 @@ import org.bukkit.block.Chest;
 import org.bukkit.configuration.ConfigurationSection;
 import org.bukkit.scheduler.BukkitRunnable;
 import org.bukkit.util.Vector;
+import org.jetbrains.annotations.NotNull;
 
 import java.util.*;
 import java.util.logging.Level;
@@ -117,25 +118,39 @@ public class LootChestRegion {
         MMOCore.plugin.lootChests.register(lootChest);
     }
 
+    /**
+     * @param player Player rolling the tier
+     * @return A randomly picked tiers taking into account tier spawn rates
+     *         and the player Chance attribute
+     */
+    @NotNull
     public ChestTier rollTier(PlayerData player) {
-        double chance = player.getStats().getStat(StatType.CHANCE);
+        double chance = player.getStats().getStat(StatType.CHANCE) * MMOCore.plugin.configManager.lootChestsChanceWeight;
 
-        //chance=0 ->the tier.chance remains the same
-        //chance ->+inf -> the tier.chance becomes the same for everyone, uniform law
-        //chance=8-> tierChance=sqrt(tierChance)
         double sum = 0;
-        for (ChestTier tier : tiers) {
-            sum += Math.pow(tier.chance, 1 / Math.pow((1 + chance),1/3));
-        }
+        for (ChestTier tier : tiers)
+            sum += getTierCoefficient(tier.getChance(), chance);
+        Validate.isTrue(sum > 0, "No chest tier was found");
 
-        double s=0;
+        double cummulated = 0;
         for (ChestTier tier : tiers) {
-            s+=Math.pow(tier.chance, 1 / Math.pow((1 + chance),1/3))/sum;
-            if (random.nextDouble() < s)
+            cummulated += getTierCoefficient(tier.getChance(), chance);
+            if (random.nextDouble() < cummulated / sum)
                 return tier;
         }
 
-        return tiers.stream().findAny().orElse(null);
+        throw new RuntimeException("Could not roll chest tier");
+    }
+
+    private static final double CHANCE_COEF = 7 / 100;
+
+    /**
+     * - Chance = 0    | tier coefficient is left unchanged.
+     * - Chance -> +oo | all tier coefficients are the same (1)
+     * - Chance = 50   | coefficients become their square roots
+     */
+    private double getTierCoefficient(double initialTierChance, double chance) {
+        return Math.pow(initialTierChance, 1 / Math.pow(1 + CHANCE_COEF * chance, 1 / 3));
     }
 
     public Location getRandomLocation(Location center) {

src/main/java/net/Indyuce/mmocore/loot/droptable/condition/PermissionCondition.java

@@ -15,8 +15,6 @@ public class PermissionCondition extends Condition {
 
     @Override
     public boolean isMet(ConditionInstance entity) {
-        if (entity.getEntity() instanceof Player)
-            return entity.getEntity().hasPermission(perm);
-        return false;
+        return entity.getEntity() instanceof Player && entity.getEntity().hasPermission(perm);
     }
 }

src/main/java/net/Indyuce/mmocore/manager/ConfigManager.java

@@ -27,6 +27,7 @@ public class ConfigManager {
     public String partyChatPrefix, noSkillBoundPlaceholder;
     public ChatColor staminaFull, staminaHalf, staminaEmpty;
     public long combatLogTimer, lootChestExpireTime, lootChestPlayerCooldown, globalSkillCooldown;
+    public double lootChestsChanceWeight;
 
     private final FileConfiguration messages;
     private final boolean chatInput;
@@ -97,6 +98,7 @@ public class ConfigManager {
         lootChestPlayerCooldown = (long) MMOCore.plugin.getConfig().getDouble("player-cooldown") * 1000L;
         globalSkillCooldown = MMOCore.plugin.getConfig().getLong("global-skill-cooldown") * 50;
         noSkillBoundPlaceholder = getSimpleMessage("no-skill-placeholder").message();
+        lootChestsChanceWeight = MMOCore.plugin.getConfig().getDouble("chance-stat-weight.loot-chests");
 
         staminaFull = getColorOrDefault("stamina-whole", ChatColor.GREEN);
         staminaHalf = getColorOrDefault("stamina-half", ChatColor.DARK_GREEN);

src/main/resources/config.yml

@@ -58,6 +58,18 @@ protect-custom-mine: false
 # - parties_and_friends
 party-plugin: mmocore
 
+# MythicLib introduces a CHANCE stat that is used in
+# several different systems in MMOCore. By changing these
+# weights you can define how much the Chance stat impacts
+# the different features implemented by MMOCore
+#
+# e.g setting some weight to 2 will DOUBLE the effect of
+# the chance stat in one particular system. The weights are
+# all set to 1 by default, this option is really server specific
+chance-stat-weight:
+
+  loot-chests: 1
+
 # Whether blocks generated with a "cobblegenerator" should
 # provide the player with experience points or not
 should-cobblestone-generators-give-exp: false