extends SceneTree

# Headless gameplay test: run with
#   godot --headless -s res://tests/test_cargo_readout.gd
# Forgejo #15 (part 2 of #12): what the fleet is carrying has to be visible
# separately from what is banked.
#
# Since #14, ore is cargo until the fleet delivers it to the mothership. The
# banked readout does not move on pickup, so without a second readout mining
# looks broken - you gather ore and no number on screen changes.
#
# --headless has no GPU and draws no pixels, so this asserts on the two
# readouts' state, not on their appearance. tests/screenshot.sh covers
# whether they are legible.
#
# Verifies:
#   1. the banked readout keeps showing the BANK, not the total
#   2. the cargo readout shows the hold, and appears only while carrying
#   3. an empty hold hides it rather than parking a permanent 0 beside the
#      real total
#   4. delivering moves the number from one readout to the other
#   5. the two are actually told apart on screen, rather than being the same
#      number twice in the same colour at the same place

var game_state: Node
var scene: Node
var banked: Control
var cargo: Control
var stage: int = 0
var mothership_id: int = 0
var elapsed: float = 0.0


func _initialize() -> void:
	game_state = root.get_node("GameState")
	game_state.buildings.clear()
	game_state.extractors.clear()
	game_state.rocks = 42
	game_state.fleet_cargo = 0
	# Banking is a transfer TO the mothership now (#24), and a transfer needs
	# a building to aim at. Only the record is required - the transfer
	# primitives work off GameState, not off the spawned node - so this stays
	# a display test rather than becoming one about the building system.
	mothership_id = game_state.add_building(GameState.BUILDING_MOTHERSHIP, Vector2.ZERO)
	scene = load("res://Main.tscn").instantiate()
	root.add_child(scene)


func _process(delta: float) -> bool:
	elapsed += delta
	match stage:
		0:
			if elapsed < 0.2:
				return false
			# ResourceReadout builds its rows in _ready(), which for a -s
			# entry-point script does not fire synchronously inside
			# _initialize()'s add_child() - it is deferred to the first
			# frame. Looking these up here, after the elapsed wait above,
			# instead of right after add_child(), is what makes them non-null.
			var readout: Node = scene.get_node("UI/ResourceReadout")
			banked = readout.banked_number(GameState.RESOURCE_ORE)
			cargo = readout.fleet_number(GameState.RESOURCE_ORE)
			# --- 3. nothing carried -> no cargo readout -----------------
			if cargo.visible:
				print("TEST_CARGO_READOUT: FAIL (cargo readout showing with an empty hold)")
				quit(1)
				return true
			if banked.amount != 42:
				print("TEST_CARGO_READOUT: FAIL (banked readout shows %d, bank is 42)" % banked.amount)
				quit(1)
				return true
			print("empty hold -> cargo readout hidden, banked shows %d" % banked.amount)

			game_state.collect_cargo(7)
			elapsed = 0.0
			stage = 1
			return false
		1:
			if elapsed < 0.2:
				return false
			# --- 1 + 2. carried and banked are separate numbers ---------
			if not cargo.visible:
				print("TEST_CARGO_READOUT: FAIL (carrying 7 and the cargo readout is hidden)")
				quit(1)
				return true
			if cargo.amount != 7:
				print("TEST_CARGO_READOUT: FAIL (cargo readout shows %d, hold is 7)" % cargo.amount)
				quit(1)
				return true
			if banked.amount != 42:
				print("TEST_CARGO_READOUT: FAIL (banked readout moved to %d on a pickup - it is showing the total, not the bank)" % banked.amount)
				quit(1)
				return true
			print("carrying 7 -> cargo=%d banked=%d" % [cargo.amount, banked.amount])

			# --- 5. genuinely distinguishable ---------------------------
			if cargo.glow_color == banked.glow_color:
				print("TEST_CARGO_READOUT: FAIL (both readouts drawn in the same colour)")
				quit(1)
				return true
			if cargo.position == banked.position:
				print("TEST_CARGO_READOUT: FAIL (both readouts in the same place)")
				quit(1)
				return true
			print("distinct: colours %s vs %s, at %s vs %s" % [
				cargo.glow_color, banked.glow_color, cargo.position, banked.position
			])

			# --- 4. delivery moves it across ----------------------------
			game_state.transfer_to_building(mothership_id, game_state.fleet_cargo)
			elapsed = 0.0
			stage = 2
			return false
		2:
			if elapsed < 0.2:
				return false
			if cargo.visible:
				print("TEST_CARGO_READOUT: FAIL (cargo readout still showing after delivery)")
				quit(1)
				return true
			if banked.amount != 49:
				print("TEST_CARGO_READOUT: FAIL (banked shows %d after delivering 7 into 42)" % banked.amount)
				quit(1)
				return true
			print("delivered -> cargo hidden, banked shows %d" % banked.amount)
			print("TEST_CARGO_READOUT: PASS")
			quit(0)
			return true
	return false