extends Node2D

# Purely visual: a transport vessel running a hub -> mothership -> building
# supply route. Carries no state of its own; GameState owns the simulation
# and TransporterField creates, positions and frees this to match.

const VESSEL_DEFINITIONS = preload("res://vessels/VesselDefinitions.gd")
const HULL_COLOR: Color = Color(0.95, 0.55, 0.85)

var laden: bool = false


func _ready() -> void:
	add_to_group("transporters")
	z_index = -1
	queue_redraw()


func set_laden(value: bool) -> void:
	if laden == value:
		return
	laden = value
	queue_redraw()


func _draw() -> void:
	# Squat and boxy, in the transport hub's own magenta, so it reads as
	# "belongs to the hub" and not as an extractor hauler (green) or a fleet
	# vessel (sharp cyan triangle).
	#
	# Taken from the DEFINITION rather than written out here. #216 made these
	# fly out from the mothership as ordinary deliveries, and a delivery draws
	# the definition's hull - so a second copy of the shape here meant a
	# transporter changed shape the moment it was assigned. One shape, one
	# place, whichever node is drawing it.
	NeonDraw.draw_glowing_polygon(self, _hull(), HULL_COLOR, 1.0)
	if laden:
		# A visible payload, so a loaded run is distinguishable from a
		# deadhead back to the hub at a glance.
		NeonDraw.draw_glowing_polygon(self, PackedVector2Array([
			Vector2(-5, 0), Vector2(5, 0), Vector2(5, 9), Vector2(-5, 9),
		]), HULL_COLOR, 0.85)


func _hull() -> PackedVector2Array:
	var definition: Resource = VESSEL_DEFINITIONS.get_definition(GameState.VESSEL_TRANSPORTER)
	return PackedVector2Array() if definition == null else definition.hull_points