class_name Building extends Node2D

var location : Vector2i # x is the angle, y is the height in the grid
var dimension : Vector2i = Vector2(2, 1) # same as above
@onready var grid : Grid = get_parent()

# make sure location is set before adding a building to the scene tree
# also make sure that the buildings are instantiated as children of the grid
func _ready() -> void:
	assert(grid != null)
	var angle = location.x * TAU / grid.num_collumns; # currently assumes anchor is bottom left
	var height = grid.ground_radius + location.y * grid.cell_height;
	position = height * Vector2.from_angle(angle)
	grid.buildings.append(self)
	
	for enemy in $EnemyList.get_children():
		enemy.reparent(get_parent())

func overlaps(other : Building):
	# heights don't overlap
	if location.y >= other.location.y + other.dimension.y: return false # other is below
	if location.y + dimension.y <= other.location.y: return false # other is above
	
	# angles overlap. We can now assume heights overlap
	var relative_other_loc = (other.location.x - location.x + grid.num_collumns) % grid.num_collumns
	if dimension.x > relative_other_loc: return true
	if relative_other_loc + other.dimension.x > grid.num_collumns: return true
	
	# If we get here, angles do not overlap
	return false