extends Node

# TektonController - AI for Tekton NPC
# Handles random movement logic.

@export var move_interval_min: float = 0.1
@export var move_interval_max: float = 0.1

var tekton: Node3D
var enhanced_gridmap: Node
var timer: Timer
var rng = RandomNumberGenerator.new()

func _ready():
	if not is_multiplayer_authority():
		set_process(false)
		return # Only server/authority runs AI
		
	tekton = get_parent()
	# Wait for tekton to be ready and have gridmap
	await get_tree().create_timer(1.0).timeout
	enhanced_gridmap = tekton.enhanced_gridmap
	
	rng.randomize()
	
	# Setup Timer
	timer = Timer.new()
	add_child(timer)
	timer.one_shot = true
	timer.timeout.connect(_on_timer_timeout)
	_start_timer()

func _start_timer():
	var time = rng.randf_range(move_interval_min, move_interval_max)
	timer.start(time)

func _on_timer_timeout():
	if not is_instance_valid(tekton) or not is_instance_valid(enhanced_gridmap):
		return
		
	_attempt_move()
	_start_timer()

func _attempt_move():
	if tekton.is_moving: return
	
	var neighbors = enhanced_gridmap.get_neighbors(tekton.current_position, 0)
	var valid_moves = []
	
	for n in neighbors:
		if n.is_walkable:
			if _is_occupied(n.position):
				continue
			valid_moves.append(n.position)
			
	if valid_moves.size() > 0:
		var target = valid_moves[rng.randi() % valid_moves.size()]
		tekton.move_to(target)

func _is_occupied(pos: Vector2i) -> bool:
	var players = get_tree().get_nodes_in_group("Players")
	for p in players:
		if p.current_position == pos:
			return true
	# Also check other Tektons?
	var tektons = get_tree().get_nodes_in_group("Tektons")
	for t in tektons:
		if t != tekton and t.current_position == pos:
			return true
	return false