extends Node

class_name World

var chunks : Dictionary[Vector2i, Chunk]

var tps = 1
var update_timer = 0

signal updated(chunk : Chunk)

func get_chunk_at(position : Vector2i) -> Chunk:
	if chunks.has(position): return chunks[position]

	var new_chunk : Chunk = Chunk.new(position)

	chunks[position] = new_chunk
	
	return new_chunk

func tile_pos_to_chunk_pos(position : Vector2i) -> Vector2i:
	return floor(Vector2(position) / TileGlobals.chunk_size)

func _ready() -> void:
	pass

func set_tile(position : Vector2i, tile_id : int):
	var chunk_position : Vector2i = tile_pos_to_chunk_pos(position)
	var position_in_chunk = position - chunk_position * TileGlobals.chunk_size
	var chunk : Chunk = get_chunk_at(chunk_position)
	
	chunk.set_tile(position_in_chunk, tile_id)
	updated.emit(chunk)

func add_item(position : Vector2i, item : Item):
	var chunk_position : Vector2i = tile_pos_to_chunk_pos(position)
	var position_in_chunk = position - chunk_position * TileGlobals.chunk_size
	var chunk : Chunk = get_chunk_at(chunk_position)

func global_position_to_tile(position : Vector2) -> Vector2i:
	return Vector2i(floor(position/TileGlobals.tile_size))

func update_chunks():
	for chunk in chunks.values():
		if chunk.update():
			updated.emit(chunk)

func _process(delta):
	update_timer -= delta
	if update_timer <= 0:
		update_timer = 1/tps
		update_chunks()