extends MarginContainer

@onready var behavior_debug_view: BehaviorTreeView = %BehaviorDebugView
@onready var mark_npc_for_debug: CheckBox = %MarkNPCForDebug
@onready var npc_option_button: OptionButton = %NPCOptionButton

var _debug_agent:NonPlayerCharacter = null
var _debug_bt_player:BTPlayer = null

func _process(_delta: float) -> void:
	if npc_option_button.item_count == 0:
		update_npc_option_button()
	
	if _debug_bt_player == null:
		return
	
	var instance: BTInstance = _debug_bt_player.get_bt_instance()
	var data: BehaviorTreeData = BehaviorTreeData.create_from_bt_instance(instance)
	behavior_debug_view.update_tree(data)

func update_npc_option_button() -> void:
	var npc_nodes:Array = get_tree().get_nodes_in_group("non_player_character")
	
	var needs_refresh = false
	
	if npc_nodes.size() != npc_option_button.item_count:
		needs_refresh = true
	else:
		for i in range(npc_nodes.size()):
			if npc_option_button.get_item_text(i) != str(npc_nodes[i].get_path()):
				needs_refresh = true
				break
	
	if needs_refresh:
		npc_option_button.clear()
		for node:Node in npc_nodes:
			var node_name:String = node.get_path().get_name(node.get_path().get_name_count() - 1)
			npc_option_button.add_item(node_name)
			npc_option_button.set_item_tooltip(npc_option_button.item_count - 1, node.get_path())

func mark_agent_active_for_debug() -> void:
	if _debug_bt_player == null:
		return
	
	var instance: BTInstance = _debug_bt_player.get_bt_instance()
	var blackboard: Blackboard = instance.get_blackboard()

	if mark_npc_for_debug.pressed:
		blackboard.set_var("debug_npc_path", _debug_agent.get_path())

func unmark_agent_active_for_debug() -> void:
	if _debug_agent == null:
		return

	var instance: BTInstance = _debug_bt_player.get_bt_instance()
	var blackboard: Blackboard = instance.get_blackboard()

	if mark_npc_for_debug.pressed:
		blackboard.set_var("debug_npc_path", NodePath())

func _on_npc_name_edit_text_submitted(new_text: String) -> void:
	unmark_agent_active_for_debug()
	
	_debug_agent = get_tree().root.find_child(new_text, true, false) as NonPlayerCharacter

	if not is_instance_valid(_debug_agent):
		push_error("Cannot show npc behavior: could not find node with name '%s'." % new_text)
		return

	_debug_bt_player = _debug_agent.find_child("BTPlayer") as BTPlayer
	if _debug_bt_player == null:
		behavior_debug_view.clear()
		push_error("Cannot show npc behavior: no BTPlayer found.")
		return
	
	if mark_npc_for_debug.pressed:
		mark_agent_active_for_debug()

func _on_mark_npc_for_debug_toggled(toggled_on: bool) -> void:
	if toggled_on:
		mark_agent_active_for_debug()

func _on_npc_option_button_item_selected(index: int) -> void:
	_debug_agent = get_tree().root.get_node(npc_option_button.get_item_tooltip(index)) as NonPlayerCharacter
	
	if _debug_agent:
		_debug_bt_player = _debug_agent.find_child("BTPlayer") as BTPlayer
		if _debug_bt_player == null:
			behavior_debug_view.clear()
			push_error("Cannot show npc behavior: no BTPlayer found.")
			return