Implement API functions

src/main/java/net/fretux/skillengine/api/SkillEngineAPI.java

@@ -0,0 +1,82 @@
+package net.fretux.skillengine.api;
+
+import net.fretux.skillengine.SkillEngine;
+import net.fretux.skillengine.capability.PlayerSkillData;
+import net.fretux.skillengine.capability.SkillEngineCapabilities;
+import net.fretux.skillengine.skilltree.SkillNode;
+import net.fretux.skillengine.skilltree.SkillNodeRegistry;
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.world.entity.player.Player;
+
+import java.util.List;
+import java.util.Set;
+public final class SkillEngineAPI {
+
+    private SkillEngineAPI() {}
+    public static ResourceLocation id(String path) {
+        return new ResourceLocation(SkillEngine.MODID, path);
+    }
+    public static ResourceLocation rl(String namespace, String path) {
+        return new ResourceLocation(namespace, path);
+    }
+    public static SkillNode getNode(ResourceLocation id) {
+        return SkillNodeRegistry.get(id);
+    }
+    public static boolean hasNode(ResourceLocation id) {
+        return SkillNodeRegistry.get(id) != null;
+    }
+    public static List<SkillNode> getAllNodes() {
+        return List.copyOf(SkillNodeRegistry.all());
+    }
+    public static PlayerSkillData getPlayerData(Player player) {
+        return player.getCapability(SkillEngineCapabilities.PLAYER_SKILLS).orElse(null);
+    }
+    public static Set<ResourceLocation> getUnlockedNodes(Player player) {
+        PlayerSkillData data = getPlayerData(player);
+        return data != null ? data.getUnlockedNodes() : Set.of();
+    }
+    
+    public static int getSkillPoints(Player player) {
+        PlayerSkillData data = getPlayerData(player);
+        return data != null ? data.getSkillPoints() : 0;
+    }
+    
+    public static void addSkillPoints(Player player, int amount) {
+        PlayerSkillData data = getPlayerData(player);
+        if (data != null) {
+            data.addSkillPoints(amount);
+        }
+    }
+    
+    public static boolean consumeSkillPoints(Player player, int amount) {
+        PlayerSkillData data = getPlayerData(player);
+        if (data != null && data.getSkillPoints() >= amount) {
+            data.addSkillPoints(-amount);
+            return true;
+        }
+        return false;
+    }
+    
+    public static boolean isUnlocked(Player player, ResourceLocation nodeId) {
+        PlayerSkillData data = getPlayerData(player);
+        return data != null && data.isUnlocked(nodeId);
+    }
+    
+    public static boolean unlockNode(Player player, ResourceLocation nodeId) {
+        PlayerSkillData data = getPlayerData(player);
+        if (data == null) return false;
+
+        SkillNode node = SkillNodeRegistry.get(nodeId);
+        if (node == null) return false;
+
+        if (!net.fretux.skillengine.skilltree.SkillLogic.canUnlock(data, player, node)) {
+            return false;
+        }
+
+        data.unlockNode(node);
+        return true;
+    }
+    public static boolean clientHasNode(ResourceLocation nodeId) {
+        return net.fretux.skillengine.client.SkilltreeClientState.isUnlocked(nodeId);
+    }
+}

src/main/java/net/fretux/skillengine/capability/PlayerSkillData.java

@@ -37,8 +37,6 @@ public class PlayerSkillData {
         }
     }
 
-    /* ---------- NBT ---------- */
-
     public CompoundTag save() {
         CompoundTag tag = new CompoundTag();
         tag.putInt("SkillPoints", skillPoints);