extends Node

const CHUNK_SIZE: int = 12;
const CHUNK_DOUBLE: int = CHUNK_SIZE*2;

const GREEN_TILE  = Vector2i(1, 1)

var tilemap: TileMap;

func _get_player_position() -> Vector2i:
	var playerPosition: Vector2i = $Ground.local_to_map($Player/AnimatedSprite2D.global_position)
	print("Playerposition is " + str(playerPosition))
	return playerPosition

# Called when the node enters the scene tree for the first time.
func _ready() -> void:
	_populate_terrain()


# Called every frame. 'delta' is the elapsed time since the previous frame.
func _process(delta: float) -> void:
	pass

func _on_exited_chunk():
	$VisibleOnScreenNotifier2D.global_position = (get_tree().get_first_node_in_group("Player").global_position)
	
	var thread: Thread = Thread.new()
	thread.start(func(): _populate_terrain())
	thread.wait_to_finish()
	
func _populate_terrain():
	var player_position: Vector2i = _get_player_position()
	
	for i in range(-CHUNK_DOUBLE, CHUNK_DOUBLE):
		for j in range(-CHUNK_DOUBLE, CHUNK_DOUBLE):
			var pos: Vector2i = player_position + Vector2i(i, j)
			if _is_empty(pos):
				_populate_cell(pos, 1, _pick_random_tile())
				
#func _populate_cell(pos: Vector2i, tile: Vector2i) -> void:
	#$Ground.set_cell.call_deferet(pos, 1, tile, 0)

func _populate_cell(coords: Vector2i, source_id: int, atlas_coords: Vector2i) -> void:
	var alternativeTilesCount: int = $Ground.tile_set.get_source(source_id).get_alternative_tiles_count(atlas_coords)
	var alternativeTileId: int = 0
	
	if alternativeTilesCount > 0:
		alternativeTileId = randi_range(0, alternativeTilesCount-1)
	
	# set_cell(coords: Vector2i, source_id: int = -1, atlas_coords: Vector2i = Vector2i(-1, -1), alternative_tile: int = 0)
	$Ground.set_cell.call_deferred(coords, source_id, atlas_coords, alternativeTileId)
	
func _populate_cell_ds(layer_id: int, coords: Vector2i, source_id: int, atlas_coords: Vector2i) -> void:
	var alternative_tiles_count = (
		tilemap.tile_set.get_source(source_id).get_alternative_tiles_count(atlas_coords)
	)
	var alternative_tile_id = 0
	if alternative_tiles_count > 0:
		alternative_tile_id = randi_range(0, alternative_tiles_count - 1)
	
	tilemap.set_cell.call_deferred(layer_id, coords, source_id, atlas_coords, alternative_tile_id)

	
func _pick_random_tile() -> Vector2i:
	# Make all Tiles green
	return Vector2i(1, 1)
	
func _is_empty(pos: Vector2i) -> bool:
	# Check if the cell is empty (source_id is -1)
	return true if $Ground.get_cell_source_id(pos) == -1 else false;