started working on spellbook

src/scripts/inventory_ui.gd

@@ -37,6 +37,11 @@ var equipment_selection_index: int = 0 # Current equipment slot index (0-5: main
 @onready var sfx_potion: AudioStreamPlayer2D = $SfxPotion
 @onready var sfx_food: AudioStreamPlayer2D = $SfxFood
 @onready var sfx_armour: AudioStreamPlayer2D = $SfxArmour
+@onready var tab_row: HBoxContainer = $InventoryContainer/MarginContainer/MarginContainer/VBoxContainer/TabRow
+@onready var inventory_tab_btn: Button = $InventoryContainer/MarginContainer/MarginContainer/VBoxContainer/TabRow/InventoryTab
+@onready var spell_book_tab_btn: Button = $InventoryContainer/MarginContainer/MarginContainer/VBoxContainer/TabRow/SpellBookTab
+@onready var spell_book_panel: Control = $InventoryContainer/MarginContainer/MarginContainer/VBoxContainer/SpellBookPanel
+@onready var inventory_hbox: HBoxContainer = $InventoryContainer/MarginContainer/MarginContainer/VBoxContainer/HBox
 
 # Bar layout constants (align X/Y + bar across rows)
 const _BAR_WIDTH: int = 100
@@ -114,6 +119,9 @@ var quantity_font: Font = null
 # Selection animation
 var selection_animation_time: float = 0.0
 
+# Tab: "inventory" or "spell_book"
+var _current_tab: String = "inventory"
+
 func _ready():
 	# Set layer to be above game but below chat
 	layer = 150
@@ -137,6 +145,12 @@ func _ready():
 	# Setup selection rectangle (already in scene, just configure it)
 	_setup_selection_rectangle()
 	
+	# Spell Book / Inventory tabs
+	if inventory_tab_btn:
+		inventory_tab_btn.pressed.connect(_on_inventory_tab_pressed)
+	if spell_book_tab_btn:
+		spell_book_tab_btn.pressed.connect(_on_spell_book_tab_pressed)
+	
 	# Find local player
 	call_deferred("_find_local_player")
 
@@ -1113,7 +1127,16 @@ func _format_item_info(item: Item) -> String:
 	text += "\n\n"
 	
 	# Controls
-	if item.item_type == Item.ItemType.Equippable:
+	if item.weapon_type == Item.WeaponType.SPELLBOOK:
+		if local_player and local_player.character_stats:
+			var spell_id = local_player.character_stats._tome_to_spell_id(item) if local_player.character_stats.has_method("_tome_to_spell_id") else ""
+			if spell_id != "" and spell_id in local_player.character_stats.learnt_spells:
+				text += "Already learnt."
+			else:
+				text += "Press F to learn spell"
+		else:
+			text += "Press F to learn spell"
+	elif item.item_type == Item.ItemType.Equippable:
 		if selected_type == "equipment":
 			text += "Press F to unequip"
 		else:
@@ -1445,6 +1468,13 @@ func _input(event):
 	if not is_open:
 		return
 	
+	# B key: switch to Spell Book tab when inventory is open
+	if event is InputEventKey and event.keycode == KEY_B and event.pressed and not event.echo:
+		_current_tab = "spell_book" if _current_tab == "inventory" else "inventory"
+		_apply_tab_visibility()
+		get_viewport().set_input_as_handled()
+		return
+	
 	# Arrow key navigation (use ui_left/right/up/down so keybindings work)
 	var direction = ""
 	var skip_repeat = event is InputEventKey and event.echo
@@ -1457,7 +1487,9 @@ func _input(event):
 	elif not skip_repeat and event.is_action_pressed("ui_down"):
 		direction = "down"
 	if direction != "":
-		if selected_type == "level_up_stat":
+		if _current_tab == "spell_book":
+			pass
+		elif selected_type == "level_up_stat":
 			_navigate_level_up_stats(direction)
 		elif selected_type == "equipment":
 			_navigate_equipment(direction)
@@ -1499,6 +1531,16 @@ func _handle_f_key():
 	if selected_type == "equipment" and selected_slot != "":
 		var equipped_item = char_stats.equipment[selected_slot]
 		if equipped_item:
+			# Tome in offhand: use (F) to learn spell and consume tome
+			if equipped_item.weapon_type == Item.WeaponType.SPELLBOOK and char_stats.has_method("learn_spell_from_tome"):
+				if char_stats.learn_spell_from_tome(equipped_item):
+					_update_ui()
+					_update_selection_from_navigation()
+					_update_selection_rectangle()
+					_update_info_panel()
+					if sfx_armour:
+						sfx_armour.play()
+					return
 			char_stats.unequip_item(equipped_item)
 			# Play armour sound when unequipping
 			if sfx_armour:
@@ -1540,6 +1582,23 @@ func _handle_f_key():
 			return
 	
 	if selected_type == "item" and selected_item:
+		# Tome in inventory: use (F) to learn spell and consume tome
+		if selected_item.weapon_type == Item.WeaponType.SPELLBOOK and char_stats.has_method("learn_spell_from_tome"):
+			if char_stats.learn_spell_from_tome(selected_item):
+				var current_item_index = inventory_selection_row * 8 + inventory_selection_col
+				_update_ui()
+				if current_item_index < char_stats.inventory.size():
+					inventory_selection_row = current_item_index / 8
+					inventory_selection_col = current_item_index % 8
+				elif char_stats.inventory.size() > 0:
+					inventory_selection_row = 0
+					inventory_selection_col = 0
+				_update_selection_from_navigation()
+				_update_selection_rectangle()
+				_update_info_panel()
+				if sfx_armour:
+					sfx_armour.play()
+				return
 		if selected_item.item_type == Item.ItemType.Equippable and selected_item.equipment_type != Item.EquipmentType.NONE:
 			# Remember which slot the item will be equipped to
 			var target_slot_name = ""
@@ -1820,6 +1879,7 @@ func _open_inventory():
 	
 	_update_ui()
 	_update_stats()
+	_apply_tab_visibility()
 	
 	if not local_player:
 		_find_local_player()
@@ -1841,6 +1901,37 @@ func _close_inventory():
 	
 	_lock_player_controls(false)
 
+func _on_inventory_tab_pressed():
+	_current_tab = "inventory"
+	# Reset selection so first item gets selected (same as TAB-open flow)
+	selected_type = ""
+	selected_item = null
+	selected_slot = ""
+	inventory_selection_row = 0
+	inventory_selection_col = 0
+	_apply_tab_visibility()
+	_update_ui()
+
+func _on_spell_book_tab_pressed():
+	_current_tab = "spell_book"
+	_apply_tab_visibility()
+
+func _apply_tab_visibility():
+	var show_inv = (_current_tab == "inventory")
+	if inventory_hbox:
+		inventory_hbox.visible = show_inv
+	if spell_book_panel:
+		spell_book_panel.visible = not show_inv
+		if not show_inv and spell_book_panel.has_method("set_character_stats"):
+			if local_player and local_player.character_stats:
+				spell_book_panel.set_character_stats(local_player.character_stats)
+			if spell_book_panel.has_method("refresh"):
+				spell_book_panel.refresh()
+	if selection_rectangle:
+		selection_rectangle.visible = show_inv
+	if info_panel:
+		info_panel.visible = show_inv
+
 func _lock_player_controls(lock: bool):
 	var game_world = get_tree().get_first_node_in_group("game_world")
 	if game_world: