Stat-API.md

@@ -280,3 +280,49 @@ public class DoubleData implements StatData, Mergeable {
 }
 ```
 Simple enough: MMOItems just adds the two values together. A little specification here: the `min` and `max` options are used to have a stat range but whenever that `StatData` is loaded from an NBTItem using `whenLoading(MMOItem mmoitem, NBTItem)`, only the `min` variable is used because a generated item does not have stat ranges anymore, they have already been rolled on item generation.
+
+## Registering a stat
+You now need to register your stat by running
+```MMOItems.plugin.getStats().register(ItemStat);```
+Make sure you register your stat before MMOItems enables, either right after MMOItems loads if it's a depend, or when your plugin enables if it's a loadbefore. MMOItems does handle `Listener` stats, no need to register them later on.
+
+## Item Restrictions
+```
+public class RequiredLevel extends DoubleStat implements ItemRestriction {
+
+	/*
+	 * stat that uses a custom DoubleStatData because the merge algorithm is
+	 * slightly different. when merging two "required level", MMOItems should
+	 * only keep the highest levels of the two and not sum the two values
+	 */
+	public RequiredLevel() {
+		super("REQUIRED_LEVEL", new ItemStack(VersionMaterial.EXPERIENCE_BOTTLE.toMaterial()), "Required Level",
+				new String[] { "The level your item needs", "in order to be used." }, new String[] { "all" });
+	}
+
+..........
+
+	@Override
+	public boolean canUse(RPGPlayer player, NBTItem item, boolean message) {
+		int level = item.getInteger("MMOITEMS_REQUIRED_LEVEL");
+		if (player.getLevel() < level && !player.getPlayer().hasPermission("mmoitems.bypass.level")) {
+			if (message) {
+				Message.NOT_ENOUGH_LEVELS.format(ChatColor.RED).send(player.getPlayer(), "cant-use-item");
+				player.getPlayer().playSound(player.getPlayer().getLocation(), Sound.ENTITY_VILLAGER_NO, 1, 1.5f);
+			}
+			return false;
+		}
+		return true;
+	}
+}
+```
+Simply let your class implement `ItemRestriction` and override the `canUse(RPGPlayer, NBTItem, boolean)` method.
+
+## Proper Stats
+""Proper"" stats are a very specific type of stats. These are stats which are supported by gem stones but which **must not** be applied onto the target item when a gem stone is being attached onto another item.\
+Examples: custom model data, shield patterns, custom sounds...
+
+Let your stat class implement the `ProperStat` interface if you don't want gems to apply the potential gem stone stat data onto the target item.
+
+## Upgradable
+More on this later when API is reworked. It's used to make stats upgradable using item upgrade templates.
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