spaceship/surface/GasVentField.gd

extends Node2D

# By path, not by its `ResourcePickupVFX` global name: a bare class-name
# reference needs the global class cache already warm, which it is not when
# this script is reached indirectly - loading Main.tscn from inside a preview
# scene made it a hard parse error. Same workaround PlanetSetups and
# PlanetSetupEditor already use.
const RESOURCE_PICKUP_VFX = preload("res://vfx/ResourcePickupVFX.gd")

@export var fleet_path: NodePath = NodePath("../Fleet")
@onready var fleet: Node2D = get_node(fleet_path)
var vents: Array[Vector2] = []
var progress: float = 0.0
var emission_phase: float = 0.0
func _ready() -> void:
	# #91: the vents are ground features and must never cover the fleet.
	# SurfaceFeatures is added AFTER Fleet in PlanetSurface.tscn, so at the
	# default z_index of 0 the later sibling simply wins and the player flies
	# UNDER their own gas source. Same fix, and the same reason, as #50's
	# capture rings and the rocks on a rocky surface (Rock.gd) - the
	# difference is that this field draws in its own _draw() rather than
	# spawning child nodes, so the depth belongs on the field itself.
	z_index = -1
	var rng := RandomNumberGenerator.new()
	rng.seed = hash(GameState.planet_id if GameState.planet_id != "" else GameState.planet_name)
	for i in range(6): vents.append(Vector2(rng.randf_range(-800,800), rng.randf_range(-650,650)))
	queue_redraw()
func _process(delta: float) -> void:
	emission_phase = fmod(emission_phase + delta * 0.55, 1.0)
	queue_redraw()
	for vent in vents:
		if fleet.get_centroid().distance_to(vent) < 90.0:
			progress += delta
			if progress >= 1.0:
				# #56: a full fleet hold rejects the deposit - keep the
				# undelivered whole units in progress rather than discarding
				# them, so gas is only ever lost by not gathering it.
				var whole: int = int(progress)
				var taken: int = GameState.collect_gas_cargo(whole)
				progress -= float(taken)
				RESOURCE_PICKUP_VFX.spawn(get_tree().root,
					to_global(vent), GameState.RESOURCE_GAS, taken)
			return
	progress = 0.0
func _draw() -> void:
	for vent in vents:
		_draw_gas_source(vent)
		_draw_emission(vent)


func _draw_gas_source(centre: Vector2) -> void:
	var colour := Color(0.85, 0.52, 1.0)
	var core := Color(0.15, 0.03, 0.22)
	var bubbles: Array = [
		[centre + Vector2(-20.0, 8.0), 20.0],
		[centre + Vector2(18.0, 14.0), 27.0],
		[centre + Vector2(17.0, -22.0), 15.0],
	]
	for bubble in bubbles:
		var ring := PackedVector2Array()
		for i in range(12):
			var angle: float = TAU * float(i) / 12.0
			ring.append(bubble[0] + Vector2(cos(angle), sin(angle)) * float(bubble[1]))
		NeonDraw.draw_glowing_polygon(self, ring, colour, 0.9, core, 0.6)


func _draw_emission(centre: Vector2) -> void:
	# Small bubbles continuously rise out of every source. This remains
	# animated even when the fleet is not collecting, so the vent reads as
	# an active gas generator rather than a static decoration.
	var core := Color(0.15, 0.03, 0.22)
	for i in range(4):
		var travel: float = fmod(emission_phase + float(i) * 0.25, 1.0)
		var bubble_centre := centre + Vector2(
			sin((travel + float(i)) * TAU) * 11.0,
			-48.0 - travel * 92.0
		)
		var radius: float = lerpf(5.0, 14.0, travel)
		var colour := Color(0.92, 0.68, 1.0, 1.0 - travel * 0.72)
		var ring := PackedVector2Array()
		for point in range(10):
			var angle: float = TAU * float(point) / 10.0
			ring.append(bubble_centre + Vector2(cos(angle), sin(angle)) * radius)
		NeonDraw.draw_glowing_polygon(self, ring, colour, 0.75, core, 0.45)