interface gui {
    use text.{text-component};
    use common.{click-type};
    use item-stack.{item-stack};

    enum gui-type {
        generic-9x1,
        generic-9x2,
        generic-9x3,
        generic-9x4,
        generic-9x5,
        generic-9x6,
        generic-3x3,
        crafter-3x3,
        anvil,
        beacon,
        blast-furnace,
        brewing-stand,
        crafting,
        enchantment,
        furnace,
        grindstone,
        hopper,
        lectern,
        loom,
        merchant,
        shulker-box,
        smithing,
        smoker,
        cartography-table,
        stonecutter,
    }

    resource gui {
        constructor(%type: gui-type, title: text-component);
        set-item: func(slot: u32, item: item-stack);
        get-item: func(slot: u32) -> option<item-stack>;
        
        /// Returns the type of this GUI.
        get-type: func() -> gui-type;
        
        /// Returns the title of this GUI.
        get-title: func() -> text-component;
        
        /// Returns the number of slots in this GUI.
        get-size: func() -> u32;
        
        /// Clears all items from the GUI.
        clear-items: func();

        /// Sets whether players can grab items out of the inventory.
        set-allow-grab-items: func(allow: bool);

        /// Returns whether players can grab items out of the inventory.
        get-allow-grab-items: func() -> bool;

        /// Sets whether players can put items into the inventory from their own.
        set-allow-put-items: func(allow: bool);

        /// Returns whether players can put items into the inventory from their own.
        get-allow-put-items: func() -> bool;
    }
}