class_name WorldGrid
extends GridMap

@export var moisture_noise: Noise
@export var temperature_noise: Noise
@export var altitude_noise: Noise
@export var grass: PackedScene

var width := 60
var depth := 60
var current_pos := Vector3i(0, 0, 0)
var old_pos := Vector3i(NAN, NAN, NAN)

func _ready():
	set_process(visible)

func _process(_delta):
	current_pos = local_to_map(Global.player.position)

	if current_pos != old_pos:
		generate_chunk()
		old_pos = current_pos

func generate_chunk():
	for x in range(-width, width):
		for z in range(-depth, depth):
			var tile_x := current_pos.x + x
			var tile_z := current_pos.z + z
			var pos := Vector3i(tile_x, 0, tile_z)

			if get_cell_item(pos) != -1:
				continue
			
			var moisture := moisture_noise.get_noise_2d(tile_x, tile_z)
			# var temperature = temperature_noise.get_noise_2d(tile_x, tile_z)
			# var altitude = altitude_noise.get_noise_2d(tile_x, tile_z)

			var index := floori((moisture + 1.0) * 2.0)
			set_cell_item(pos, index)

			if index == 1:
				var node := grass.instantiate() as Node3D
				node.position = (pos * 2) + Vector3i(1, 0, 1)
				add_child(node)