Add prestige graph

core/prestige/prestige_buff_graph_tile.gd

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+## Individual tile in the prestige buff graph UI.
+## Visually represents a single PrestigeBuffNode with locked/available/unlocked states.
+## The PrestigeBuffNode resource is assigned directly via the editor export.
+class_name PrestigeBuffGraphTile
+extends PanelContainer
+
+## The prestige buff node this tile represents. Set in the scene editor.
+@export var prestige_buff: PrestigeBuffNode
+
+@onready var _button: Button = $Button
+@onready var _icon: TextureRect = $Button/HBoxContainer/Icon
+@onready var _name_label: Label = $Button/HBoxContainer/VBoxContainer/NameLabel
+@onready var _effect_label: Label = $Button/HBoxContainer/VBoxContainer/EffectLabel
+@onready var _cost_label: Label = $Button/HBoxContainer/VBoxContainer/CostLabel
+@onready var _state_label: Label = $Button/HBoxContainer/StateLabel
+
+var _game_state: LevelGameState
+
+
+func _ready() -> void:
+	_game_state = find_parent("LevelGameState")
+	_button.pressed.connect(_on_button_pressed)
+
+	if _game_state:
+		_game_state.prestige_buff_unlocked.connect(_on_prestige_buff_unlocked)
+		_game_state.currency_changed.connect(_on_currency_changed)
+
+	if prestige_buff == null:
+		push_warning("PrestigeBuffGraphTile: prestige_buff is not set")
+		return
+
+	_refresh_visuals()
+	_refresh_state()
+
+
+func get_node_id() -> StringName:
+	if prestige_buff:
+		return prestige_buff.id
+	return &""
+
+
+func _refresh_visuals() -> void:
+	if prestige_buff == null:
+		return
+
+	_name_label.text = prestige_buff.display_name
+	_cost_label.text = "Cost: %s" % prestige_buff.get_cost().to_string_suffix(2)
+
+	if prestige_buff.icon:
+		_icon.texture = prestige_buff.icon
+
+	var effect_text: String = _format_effect_description()
+	_effect_label.text = effect_text
+	_effect_label.visible = not effect_text.is_empty()
+
+
+func _refresh_state() -> void:
+	if prestige_buff == null or _game_state == null:
+		return
+
+	var unlocked: bool = _game_state.is_prestige_buff_unlocked(prestige_buff.id)
+	var available: bool = _game_state.can_purchase_prestige_buff(prestige_buff.id)
+
+	if unlocked:
+		_state_label.text = "✓ Unlocked"
+		_button.disabled = true
+		modulate = Color.GREEN
+	elif available:
+		_state_label.text = "Available"
+		_button.disabled = false
+		modulate = Color.WHITE
+	else:
+		_state_label.text = "Locked"
+		_button.disabled = true
+		modulate = Color(0.5, 0.5, 0.5, 1.0)
+
+
+func _format_effect_description() -> String:
+	if prestige_buff == null:
+		return ""
+
+	match prestige_buff.effect_type:
+		PrestigeBuffNode.EffectType.CURRENCY_PRODUCTION_MULTIPLIER:
+			if prestige_buff.target_id != &"":
+				return "+%.0f%% %s production" % [((prestige_buff.effect_value - 1.0) * 100.0), prestige_buff.target_id]
+			return "+%.0f%% all production" % ((prestige_buff.effect_value - 1.0) * 100.0)
+		PrestigeBuffNode.EffectType.BUILDING_CREATION_BONUS:
+			return "+%.0f%% gain on build" % ((prestige_buff.effect_value - 1.0) * 100.0)
+		PrestigeBuffNode.EffectType.WORKER_THRESHOLD_MULTIPLIER:
+			return "+%.0f%% with 10+ workers" % ((prestige_buff.effect_value - 1.0) * 100.0)
+		PrestigeBuffNode.EffectType.CARRYOVER_BUILDINGS:
+			return "Keep %d buildings on prestige" % int(prestige_buff.effect_value)
+		PrestigeBuffNode.EffectType.UNLOCK_AUTO_BUY_WORKER:
+			return "Unlock auto-buy worker"
+		PrestigeBuffNode.EffectType.HOVER_SPEED_BOOST:
+			return "Hover to speed up workers"
+		PrestigeBuffNode.EffectType.UNLOCK_BUILDING:
+			return "Unlock %s building" % prestige_buff.target_id
+		PrestigeBuffNode.EffectType.WORKER_PRODUCTIVITY:
+			return "+%.0f%% worker productivity" % ((prestige_buff.effect_value - 1.0) * 100.0)
+		PrestigeBuffNode.EffectType.RESEARCH_XP_MULTIPLIER:
+			return "+%.0f%% research XP" % ((prestige_buff.effect_value - 1.0) * 100.0)
+		_:
+			return ""
+
+
+func _on_button_pressed() -> void:
+	if _game_state and prestige_buff:
+		_game_state.purchase_prestige_buff(prestige_buff.id)
+
+
+func _on_prestige_buff_unlocked(buff_id: StringName) -> void:
+	if prestige_buff and buff_id == prestige_buff.id:
+		_refresh_state()
+
+
+func _on_currency_changed(currency_id: StringName, _new_amount: BigNumber) -> void:
+	if _game_state == null or prestige_buff == null:
+		return
+	var asc_id: StringName = _game_state.get_prestige_currency_id()
+	if currency_id == asc_id:
+		_refresh_state()