Add client-side ability cooldowns, sync, and GUI updates

src/main/java/net/fretux/skillengine/client/AbilityHudOverlay.java

@@ -0,0 +1,38 @@
+package net.fretux.skillengine.client;
+
+import net.fretux.skillengine.skilltree.AbilityNode;
+import net.fretux.skillengine.skilltree.AbilityNodeRegistry;
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.gui.GuiGraphics;
+import net.minecraft.resources.ResourceLocation;
+import net.minecraftforge.client.event.RenderGuiEvent;
+import net.minecraftforge.eventbus.api.SubscribeEvent;
+import net.minecraftforge.fml.common.Mod;
+
+@Mod.EventBusSubscriber
+public class AbilityHudOverlay {
+
+    @SubscribeEvent
+    public static void render(RenderGuiEvent.Post event) {
+        Minecraft mc = Minecraft.getInstance();
+        if (mc.player == null) return;
+        int xStart = event.getGuiGraphics().guiWidth() - 80;
+        int yStart = 10;
+        for (int slot = 1; slot <= 3; slot++) {
+            var abilityId = SkilltreeClientState.getAbilityInSlot(slot);
+            if (abilityId == null) continue;
+            AbilityNode ability = AbilityNodeRegistry.get(abilityId);
+            if (ability == null) continue;
+            int cd = SkilltreeClientState.getClientCooldown(slot);
+            ResourceLocation icon = ability.getIcon();
+            GuiGraphics gfx = event.getGuiGraphics();
+            gfx.blit(icon, xStart, yStart, 0, 0, 16, 16, 16, 16);
+            if (cd > 0) {
+                String text = String.valueOf(cd / 20);
+                gfx.drawString(mc.font, text, xStart + 20, yStart + 4, 0xFF5555);
+            }
+            gfx.drawString(mc.font, "Ability " + slot, xStart + 40, yStart + 4, 0xFFFFFF);
+            yStart += 20;
+        }
+    }
+}

src/main/java/net/fretux/skillengine/client/AbilityKeybindHandler.java

@@ -0,0 +1,49 @@
+package net.fretux.skillengine.client;
+
+import com.mojang.blaze3d.platform.InputConstants;
+import net.fretux.skillengine.network.PacketHandler;
+import net.fretux.skillengine.network.ServerboundActivateAbilityPacket;
+import net.minecraft.client.KeyMapping;
+import net.minecraftforge.client.event.InputEvent;
+import net.minecraftforge.client.settings.KeyConflictContext;
+import net.minecraftforge.eventbus.api.SubscribeEvent;
+import net.minecraftforge.fml.common.Mod;
+import org.lwjgl.glfw.GLFW;
+
+@Mod.EventBusSubscriber
+public class AbilityKeybindHandler {
+
+    public static final KeyMapping ABILITY_1 = new KeyMapping(
+            "key.skillengine.ability1", KeyConflictContext.IN_GAME,
+            InputConstants.Type.KEYSYM, GLFW.GLFW_KEY_Y, "key.categories.gameplay"
+    );
+
+    public static final KeyMapping ABILITY_2 = new KeyMapping(
+            "key.skillengine.ability2", KeyConflictContext.IN_GAME,
+            InputConstants.Type.KEYSYM, GLFW.GLFW_KEY_X, "key.categories.gameplay"
+    );
+
+    public static final KeyMapping ABILITY_3 = new KeyMapping(
+            "key.skillengine.ability3", KeyConflictContext.IN_GAME,
+            InputConstants.Type.KEYSYM, GLFW.GLFW_KEY_C, "key.categories.gameplay"
+    );
+
+    @SubscribeEvent
+    public static void onInput(InputEvent.Key event) {
+        if (ABILITY_1.consumeClick()) {
+            if (SkilltreeClientState.getClientCooldown(1) <= 0) {
+                PacketHandler.CHANNEL.sendToServer(new ServerboundActivateAbilityPacket(1));
+            }
+        }
+        if (ABILITY_2.consumeClick()) {
+            if (SkilltreeClientState.getClientCooldown(2) <= 0) {
+                PacketHandler.CHANNEL.sendToServer(new ServerboundActivateAbilityPacket(2));
+            }
+        }
+        if (ABILITY_3.consumeClick()) {
+            if (SkilltreeClientState.getClientCooldown(3) <= 0) {
+                PacketHandler.CHANNEL.sendToServer(new ServerboundActivateAbilityPacket(3));
+            }
+        }
+    }
+}

src/main/java/net/fretux/skillengine/client/ClientCooldownTicker.java

@@ -0,0 +1,22 @@
+package net.fretux.skillengine.client;
+
+import net.minecraftforge.api.distmarker.Dist;
+import net.minecraftforge.event.TickEvent;
+import net.minecraftforge.eventbus.api.SubscribeEvent;
+import net.minecraftforge.fml.common.Mod;
+import net.fretux.skillengine.SkillEngine;
+
+@Mod.EventBusSubscriber(modid = SkillEngine.MODID, value = Dist.CLIENT)
+public class ClientCooldownTicker {
+
+    @SubscribeEvent
+    public static void onClientTick(TickEvent.ClientTickEvent event) {
+        if (event.phase != TickEvent.Phase.END) return;
+        for (int i = 0; i < 3; i++) {
+            int cd = SkilltreeClientState.getClientCooldown(i + 1);
+            if (cd > 0) {
+                SkilltreeClientState.updateCooldown(i + 1, cd - 1);
+            }
+        }
+    }
+}

src/main/java/net/fretux/skillengine/client/SkilltreeClientState.java

@@ -17,6 +17,15 @@ public class SkilltreeClientState {
     private static final Set<ResourceLocation> unlockedAbilities = new HashSet<>();
     private static int currentSkillPoints = 0;
     private static final ResourceLocation[] abilitySlots = new ResourceLocation[3];
+    private static final int[] clientCooldowns = new int[3];
+
+    public static void updateCooldown(int slot, int cd) {
+        clientCooldowns[slot - 1] = cd;
+    }
+
+    public static int getClientCooldown(int slot) {
+        return clientCooldowns[slot - 1];
+    }
 
     public static void unlockNode(ResourceLocation id) {
         SkillEngine.LOGGER.info("[CLIENT] Unlocking node: {}", id);

src/main/java/net/fretux/skillengine/client/SkilltreeScreen.java

@@ -246,6 +246,14 @@ public class SkilltreeScreen extends Screen {
                         );
                     }));
         }
+        if (!hoveredNode.getExclusiveWith().isEmpty()) {
+            tooltip.add(Component.literal("Mutually Exclusive with:")
+                    .withStyle(ChatFormatting.RED));
+            for (ResourceLocation ex : hoveredNode.getExclusiveWith()) {
+                tooltip.add(Component.literal(" - " + ex.toString())
+                        .withStyle(ChatFormatting.RED));
+            }
+        }
         gfx.renderComponentTooltip(font, tooltip, mouseX, mouseY);
     }