Begin to add a pseudo-gui system

src/main/java/dev/zontreck/ase/commands/CommandRegistry.java

@@ -6,6 +6,7 @@ import dev.zontreck.ase.commands.homes.DelHomeCommand;
 import dev.zontreck.ase.commands.homes.HomeCommand;
 import dev.zontreck.ase.commands.homes.HomesCommand;
 import dev.zontreck.ase.commands.homes.SetHomeCommand;
+import dev.zontreck.ase.commands.misc.CreditsCommand;
 import dev.zontreck.ase.commands.misc.ShareItemCommand;
 import dev.zontreck.ase.commands.tpa.TPACancelCommand;
 import dev.zontreck.ase.commands.tpa.TPACommand;
@@ -82,5 +83,9 @@ public class CommandRegistry {
                 cmds.register(Commands.literal("shareitem")
                                 .requires(x -> x.getSender().isPermissionSet(ShareItemCommand.PERMISSION))
                                 .executes(ctx -> ShareItemCommand.execute(ctx.getSource())).build());
+
+                cmds.register(Commands.literal("asecredits")
+                                .requires(x -> x.getSender().isPermissionSet(CreditsCommand.PERMISSION))
+                                .executes(ctx -> CreditsCommand.execute(ctx.getSource())).build());
         }
 }

src/main/java/dev/zontreck/ase/commands/misc/CreditsCommand.java

@@ -0,0 +1,23 @@
+package dev.zontreck.ase.commands.misc;
+
+import org.bukkit.entity.Player;
+
+import com.mojang.brigadier.Command;
+
+import dev.zontreck.ase.guis.CreditsGui;
+import io.papermc.paper.command.brigadier.CommandSourceStack;
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.format.NamedTextColor;
+
+public class CreditsCommand {
+    public static final String PERMISSION = "ase.commands.asecredits";
+
+    public static int execute(CommandSourceStack ctx) {
+        Player player = (Player) ctx.getSender();
+        player.sendMessage(Component.text("Opening credits GUI...", NamedTextColor.DARK_GREEN));
+
+        CreditsGui.openGUI(player);
+
+        return Command.SINGLE_SUCCESS;
+    }
+}

src/main/java/dev/zontreck/ase/guis/ChestGUI.java

@@ -0,0 +1,104 @@
+package dev.zontreck.ase.guis;
+
+import java.util.List;
+
+import org.bukkit.Bukkit;
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.Inventory;
+import org.bukkit.inventory.InventoryView;
+import org.bukkit.inventory.ItemStack;
+
+import net.kyori.adventure.text.Component;
+
+public class ChestGUI {
+    // START STATIC REGISTRY
+    public static final List<ChestGUI> GUI_LIST = new java.util.ArrayList<>();
+
+    public static void register(ChestGUI gui) {
+        GUI_LIST.add(gui);
+    }
+
+    public static void checkValidity() {
+        for (int i = 0; i < GUI_LIST.size(); i++) {
+            ChestGUI gui = GUI_LIST.get(i);
+            if (!gui.valid()) {
+                GUI_LIST.remove(gui);
+            }
+        }
+    }
+
+    public static ChestGUI getGUIForPlayer(Player player) {
+        for (ChestGUI gui : GUI_LIST) {
+            if (gui.player != null && gui.player.getUniqueId().equals(player.getUniqueId())) {
+                return gui;
+            }
+        }
+        return null;
+    }
+    // END STATIC REGISTRY
+
+    public String guiTitle;
+    public List<ItemStack> buttons;
+    public int totalSize;
+    public Player player;
+    public boolean closed = false;
+
+    public ChestGUI(String title, int size) {
+        this.guiTitle = title;
+        this.totalSize = size;
+    }
+
+    public void setPlayer(Player player) {
+        this.player = player;
+    }
+
+    public void fill(int amount, PrimitiveItem item) {
+        for (int i = 0; i < amount; i++) {
+            buttons.add(item.generate());
+        }
+    }
+
+    /**
+     * This method presents the GUI to the player, using the defined layout above.
+     */
+    public void doPresentation() {
+        Inventory inv = Bukkit.createInventory(null, totalSize, Component.text(guiTitle));
+
+        for (int i = 0; i < buttons.size(); i++) {
+            inv.setItem(i, buttons.get(i));
+        }
+
+        player.openInventory(inv);
+        register(this);
+    }
+
+    public void close() {
+        // Assume the player is still in this GUI if it has not been invalidated.
+        if (valid()) {
+            player.closeInventory();
+            closed = true;
+        } else {
+            closed = true; // Ensure this is set to true.
+        }
+    }
+
+    public boolean valid() {
+        if (player == null) {
+            return false;
+        }
+
+        if (closed)
+            return false;
+
+        InventoryView inv = player.getOpenInventory();
+        if (inv == null) {
+            return false;
+        }
+
+        if (inv.title().toString().contains(guiTitle)) {
+            return true;
+        } else {
+            return false;
+        }
+    }
+}

src/main/java/dev/zontreck/ase/guis/CreditsGui.java

@@ -0,0 +1,19 @@
+package dev.zontreck.ase.guis;
+
+import org.bukkit.Material;
+import org.bukkit.entity.Player;
+
+import net.kyori.adventure.text.Component;
+
+public class CreditsGui {
+    public static void openGUI(Player player) {
+        // First step, construct the layout
+        ChestGUI gui = new ChestGUI("Credits", 9 * 4);
+        gui.fill(9, new PrimitiveItem(Material.BLACK_STAINED_GLASS_PANE, Component.text(""), true,
+                Component.text().build()));
+
+        // Second step, present to the player
+
+        gui.doPresentation();
+    }
+}

src/main/java/dev/zontreck/ase/guis/PrimitiveItem.java

@@ -0,0 +1,77 @@
+package dev.zontreck.ase.guis;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.bukkit.Material;
+import org.bukkit.NamespacedKey;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.meta.ItemMeta;
+import org.bukkit.persistence.PersistentDataContainer;
+import org.bukkit.persistence.PersistentDataType;
+
+import dev.zontreck.ase.AriasServerEssentials;
+import net.kyori.adventure.text.Component;
+
+/**
+ * This is a primitive item.
+ */
+public class PrimitiveItem {
+    public static final String GUI_TAG = "ase_cgui";
+    public Material itemType;
+    public Component name;
+    public Component[] itemLore;
+    public boolean isGUIButton;
+
+    public PrimitiveItem(Material type, Component name, boolean isGUIButton, Component... lore) {
+        itemType = type;
+        this.name = name;
+        itemLore = lore;
+        this.isGUIButton = isGUIButton;
+    }
+
+    public PrimitiveItem(Material type, Component name, boolean isGUIButton) {
+        itemType = type;
+        this.name = name;
+        itemLore = new Component[0];
+        this.isGUIButton = isGUIButton;
+    }
+
+    public ItemStack generate() {
+        ItemStack item = new ItemStack(itemType, 1);
+
+        List<Component> lore = new ArrayList<>();
+        for (Component component : itemLore) {
+            lore.add(component);
+        }
+
+        ItemMeta meta = item.getItemMeta();
+
+        PersistentDataContainer data = meta.getPersistentDataContainer();
+
+        meta.lore(lore);
+        meta.customName(name);
+
+        if (isGUIButton) {
+            data.set(NamespacedKey.fromString(GUI_TAG, AriasServerEssentials.getSelf()), PersistentDataType.BOOLEAN,
+                    true);
+        }
+
+        item.setItemMeta(meta);
+        return item;
+    }
+
+    public static boolean isGUIButton(ItemStack item) {
+        if (item == null || item.getType() == Material.AIR) {
+            return false;
+        }
+        ItemMeta meta = item.getItemMeta();
+        if (meta == null) {
+            return false;
+        }
+        PersistentDataContainer data = meta.getPersistentDataContainer();
+        return data.has(NamespacedKey.fromString(GUI_TAG, AriasServerEssentials.getSelf()),
+                PersistentDataType.BOOLEAN);
+    }
+
+}