class_name Core
extends StaticBody2D
## The red core. Hitting it in the game scene wins the level.

## Nominal radius; the core is drawn and collides [constant Block.GAP] / 2 inside it, like the
## blocks, so the gap to the first ring matches the gap between tiles.
@export var radius := Params.CORE_RADIUS


func _ready() -> void:
	collision_layer = Params.LAYER_BLOCKS
	collision_mask = 0
	var shape := CircleShape2D.new()
	shape.radius = radius - Block.GAP / 2.0
	var collision := CollisionShape2D.new()
	collision.shape = shape
	add_child(collision)


## Grows to fill the screen; returns when the animation ends.
func explode() -> void:
	collision_layer = 0
	var tween := create_tween()
	tween.tween_property(self, "scale", scale * 20.0, 1.0)
	await tween.finished


func _draw() -> void:
	draw_circle(Vector2.ZERO, radius - Block.GAP / 2.0, Params.COLOR_RED, true, -1.0, true)