From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Samsuik <kfian294ma4@gmail.com>
Date: Thu, 12 Jan 2023 22:59:28 +0000
Subject: [PATCH] Player GUI API


diff --git a/src/main/java/me/samsuik/sakura/player/gui/ItemIcon.java b/src/main/java/me/samsuik/sakura/player/gui/ItemIcon.java
new file mode 100644
index 0000000000000000000000000000000000000000..cc0645aa27e6e96922f26242e71fef5d6c06fcfd
--- /dev/null
+++ b/src/main/java/me/samsuik/sakura/player/gui/ItemIcon.java
@@ -0,0 +1,9 @@
+package me.samsuik.sakura.player.gui;
+
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.ItemStack;
+
+import java.util.function.Consumer;
+import java.util.function.Function;
+
+public record ItemIcon(Function<Player, ItemStack> itemUpdate, Consumer<Player> onClick, int slot) {}
diff --git a/src/main/java/me/samsuik/sakura/player/gui/PlayerGUI.java b/src/main/java/me/samsuik/sakura/player/gui/PlayerGUI.java
new file mode 100644
index 0000000000000000000000000000000000000000..8eec1182c82ea9f1ca88998494280ad1d7b7d653
--- /dev/null
+++ b/src/main/java/me/samsuik/sakura/player/gui/PlayerGUI.java
@@ -0,0 +1,122 @@
+package me.samsuik.sakura.player.gui;
+
+import org.bukkit.entity.Player;
+import org.bukkit.event.inventory.InventoryClickEvent;
+import org.bukkit.inventory.Inventory;
+import org.bukkit.inventory.InventoryHolder;
+import org.bukkit.inventory.ItemStack;
+import org.jetbrains.annotations.ApiStatus;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.function.BiFunction;
+import java.util.function.Consumer;
+
+public abstract class PlayerGUI {
+
+    private static final List<PlayerGUI> REGISTERED_GUIS = new ArrayList<>();
+    protected static final Consumer<Player> NOTHING = (p) -> {};
+
+    private final Map<Integer, ItemIcon> iconMap = new HashMap<>();
+    private final Holder holder = new Holder();
+    private final BiFunction<Player, Holder, Inventory> base;
+    private boolean registered = false;
+
+    public PlayerGUI(BiFunction<Player, Holder, Inventory> base) {
+        this.base = base;
+    }
+
+    protected void registerIcon(ItemIcon icon) {
+        iconMap.put(icon.slot(), icon);
+    }
+
+    protected abstract void register();
+
+    protected void refresh(Player player) {
+        Inventory inventory = player.getOpenInventory().getTopInventory();
+
+        if (inventory.getHolder() instanceof Holder) {
+            iconMap.forEach((slot, icon) -> updateIcon(player, icon, inventory));
+        }
+    }
+
+    protected void refreshSlot(Player player, int slot) {
+        Inventory inventory = player.getOpenInventory().getTopInventory();
+
+        if (inventory.getHolder() instanceof Holder && iconMap.containsKey(slot)) {
+            updateIcon(player, iconMap.get(slot), inventory);
+        }
+    }
+
+    public void unregister() {
+        REGISTERED_GUIS.remove(this);
+        registered = false;
+    }
+
+    @ApiStatus.Internal
+    public static void onWindowClick(InventoryClickEvent event) {
+        for (PlayerGUI ui : REGISTERED_GUIS) {
+            Inventory inventory = event.getClickedInventory();
+
+            if (inventory != null && inventory.getHolder() == ui.holder) {
+                ui.handleSlotClick(event, inventory);
+            }
+        }
+    }
+
+    private void handleSlotClick(InventoryClickEvent event, Inventory inventory) {
+        event.setCancelled(true);
+
+        Player player = (Player) event.getWhoClicked();
+        int slot = event.getSlot();
+        ItemIcon icon = iconMap.get(slot);
+
+        if (icon != null) {
+            icon.onClick()
+                .andThen(p -> updateIcon(player, icon, inventory))
+                .accept(player);
+        }
+    }
+
+    private void updateIcon(Player player, ItemIcon icon, Inventory inventory) {
+        ItemStack item = icon.itemUpdate().apply(player);
+        inventory.setItem(icon.slot(), item);
+    }
+
+    public void showTo(Player player) {
+        player.openInventory(createInventory(player));
+    }
+
+    private Inventory createInventory(Player player) {
+        if (!registered) {
+            registerUI();
+        }
+
+        Inventory inventory = base.apply(player, holder);
+
+        for (ItemIcon icon : iconMap.values()) {
+            updateIcon(player, icon, inventory);
+        }
+
+        return inventory;
+    }
+
+    private void registerUI() {
+        register();
+        REGISTERED_GUIS.add(this);
+        registered = true;
+    }
+
+    protected static class Holder implements InventoryHolder {
+        private Holder() {}
+
+        @Override
+        public @NotNull Inventory getInventory() {
+            return null;
+        }
+    }
+
+}