## Conway's Game of Life
## 	Rules:
##		1. Any cell with >2 neighbors survives
##		2. Any dead cell with 3 live neighbors becomes alive
##		3. All other cells die (all dead cells remaing dead)
extends Node2D

@export var world_seed: int
@export var cell_size: Vector2 = Vector2(16, 16)
@export var cell_texture: Texture2D
@export var world_size: Vector2 = Vector2(128, 128)

var cell_instance
var generation: int = 1
var world: Array = []


func _ready() -> void:
	if world_seed: seed(world_seed)
	generate_world()


# Create the cell using the rendering server
func create_cell(location: Vector2) -> RID:
	var rs = RenderingServer
	cell_instance = rs.canvas_item_create()
	rs.canvas_item_set_parent(cell_instance, get_canvas_item())

	var rect: Rect2 = Rect2(-cell_size.x/2, -cell_size.y/2, cell_size.x, cell_size.y) # Centered with cell size
	rs.canvas_item_add_texture_rect(cell_instance, rect, cell_texture)

	var location_fixed = Vector2(location.x * cell_size.x, location.y * cell_size.y)
	var trans = Transform2D(0, location_fixed)
	rs.canvas_item_set_transform(cell_instance, trans)

	return cell_instance

## Generate the world with the initial cells
func generate_world() -> void:
	for x in range(world_size.x):
		world.append([])
		for y in range(world_size.y):
			if randi_range(0, 1):
				world[x].append(create_cell(Vector2(x, y)))
			else:
				world[x].append(0)