extends SceneTree

const BUILDING_DEFINITIONS = preload("res://buildings/BuildingDefinitions.gd")

# Headless gameplay test: run with
#   godot --headless -s res://tests/test_transport_hub_building.gd
# Forgejo #18 (part 5 of #12): the Transport Hub is a placeable building of
# its own. Only the building here - the vessels that do the hauling are #19.
#
# Verifies:
#   1. it is gated behind its research node, like every other structure
#   2. researching it makes it buildable, and placing it charges its cost
#   3. it is drawn as ITSELF, not as the crafter - Building._draw()'s match
#      has a catch-all that renders anything unrecognised as a ship crafter,
#      so a missing case is silent and looks almost right
#   4. its geometry is rasterised ONCE however long it animates (#10), and
#      its stationed transports really do move
#   5. it has its own build-menu icon and its own map marker rather than
#      borrowing another building's - the menu was once unreadable because
#      two buildings shared a glyph

var game_state: Node
var scene: Node
var field: Node
var controller: Node
var map_content: Node2D
var hub_building: Node2D
var hub: Node2D
var stage: int = 0
var elapsed: float = 0.0
var spin_at_start: float = 0.0

const HUB_AT: Vector2 = Vector2(700.0, 0.0)


func _initialize() -> void:
	game_state = root.get_node("GameState")
	game_state.buildings.clear()
	game_state.extractors.clear()
	game_state.reset_progression()
	game_state.rocks = 500
	game_state.fleet_cargo = 0
	scene = load("res://world/Main.tscn").instantiate()
	root.add_child(scene)
	field = scene.get_node("BuildingField")
	controller = scene.get_node("BuildController")
	map_content = scene.get_node("UI/WorldMap/MapContent")


func _process(delta: float) -> bool:
	elapsed += delta
	match stage:
		0:
			scene.get_node("AsteroidField").set_process(false)
			scene.get_node("EnemySpawner").set_process(false)

			# --- 1. locked until researched ------------------------------
			if game_state.is_building_unlocked(GameState.BUILDING_TRANSPORT_HUB):
				print("TEST_TRANSPORT_HUB_BUILDING: FAIL (buildable with no research at all)")
				quit(1)
				return true
			var gate: String = game_state.research_for_building(GameState.BUILDING_TRANSPORT_HUB)
			if gate == "":
				print("TEST_TRANSPORT_HUB_BUILDING: FAIL (no research node gates it)")
				quit(1)
				return true
			print("locked behind research: '%s'" % gate)

			# --- 5. its own icon, distinct from every other building -----
			var icons: Dictionary = {}
			for type in [GameState.BUILDING_MOTHERSHIP, GameState.BUILDING_SHIP_CRAFTER,
					GameState.BUILDING_COMMAND_CENTER, GameState.BUILDING_TRANSPORT_HUB]:
				var icon: int = BUILDING_DEFINITIONS.get_definition(type).action_icon
				if icons.has(icon):
					print("TEST_TRANSPORT_HUB_BUILDING: FAIL (%s and %s share an icon)" % [type, icons[icon]])
					quit(1)
					return true
				icons[icon] = type
			print("action icons distinct across %d buildings" % icons.size())

			# --- 2. research it, then build it ---------------------------
			game_state.unlocked = ["shipyards", "logistics", "freight"]
			if not game_state.is_building_unlocked(GameState.BUILDING_TRANSPORT_HUB):
				print("TEST_TRANSPORT_HUB_BUILDING: FAIL (still locked after researching '%s')" % gate)
				quit(1)
				return true
			var hub_cost: int = int(game_state.building_costs(GameState.BUILDING_TRANSPORT_HUB)[GameState.RESOURCE_ORE])
			var before: int = game_state.rocks
			field.place(GameState.BUILDING_TRANSPORT_HUB, HUB_AT)
			game_state.spend(controller.cost_of(GameState.BUILDING_TRANSPORT_HUB))
			if game_state.rocks != before - hub_cost:
				print("TEST_TRANSPORT_HUB_BUILDING: FAIL (cost %d charged, expected %d)" % [
					before - game_state.rocks, hub_cost
				])
				quit(1)
				return true
			print("researched and placed for %d ore" % hub_cost)
			elapsed = 0.0
			stage = 1
			return false
		1:
			if elapsed < 0.3:
				return false
			for b in field.spawned:
				if is_instance_valid(b) and b.building_type == GameState.BUILDING_TRANSPORT_HUB:
					hub_building = b
					hub = b.visual
			if hub == null:
				print("TEST_TRANSPORT_HUB_BUILDING: FAIL (never spawned)")
				quit(1)
				return true
			# #216 gave the hub one action, and only one: saying how many
			# transporters to keep here. Its ROUTES are still automatic -
			# there is nothing to hand-carry - so a transfer action would put
			# back exactly what this check was written to keep out.
			if hub_building.available_actions() != PackedStringArray(["staff"]):
				print("TEST_TRANSPORT_HUB_BUILDING: FAIL (offers %s, expected only the crew menu)" \
					% [hub_building.available_actions()])
				quit(1)
				return true
			for ship in scene.get_node("Fleet").ships:
				ship.position = HUB_AT
			scene.get_node("Fleet").move_to(HUB_AT)

			# --- 3. drawn as itself, not via the crafter catch-all -------
			# _hub_traffic only exists if _ready() took the transport-hub
			# branch; a missing case falls through to the crafter and would
			# leave it null while still rendering something plausible.
			if hub._hub_traffic == null:
				print("TEST_TRANSPORT_HUB_BUILDING: FAIL (rendered through the crafter catch-all, not as a hub)")
				quit(1)
				return true

			# --- 5. its own map marker ----------------------------------
			var markers: Array = map_content.building_markers()
			var found: bool = false
			for m in markers:
				if m.type == GameState.BUILDING_TRANSPORT_HUB:
					found = true
					if m.color == BUILDING_DEFINITIONS.get_definition(GameState.BUILDING_SHIP_CRAFTER).map_color \
							or m.color == BUILDING_DEFINITIONS.get_definition(GameState.BUILDING_MOTHERSHIP).map_color \
							or m.color == BUILDING_DEFINITIONS.get_definition(GameState.BUILDING_COMMAND_CENTER).map_color:
						print("TEST_TRANSPORT_HUB_BUILDING: FAIL (map marker reuses another building's colour)")
						quit(1)
						return true
			if not found:
				print("TEST_TRANSPORT_HUB_BUILDING: FAIL (no map marker - see #11)")
				quit(1)
				return true
			print("has its own map marker")

			spin_at_start = hub._hub_traffic.rotation
			elapsed = 0.0
			stage = 2
			return false
		2:
			# --- 4. animates without ever redrawing (#10) ----------------
			if elapsed < 2.0:
				return false
			# #216 gave the hub one button - how many transporters to keep
			# here. The TRANSFER button stays absent: its routes are still
			# automatic, and hand-carrying to a hub is what this check was
			# written to keep out.
			if controller.current_building != hub_building \
					or not controller.action_button.visible \
					or controller.transfer_button.visible:
				print("TEST_TRANSPORT_HUB_BUILDING: FAIL (hub context current=%s expected=%s action=%s transfer=%s)" % [
					controller.current_building, hub_building, controller.action_button.visible,
					controller.transfer_button.visible,
				])
				quit(1)
				return true
			print("rasterisations after %.1fs: %d" % [elapsed, hub.draw_count])
			if hub.draw_count != 1:
				print("TEST_TRANSPORT_HUB_BUILDING: FAIL (redrew its geometry %d times to animate)" % hub.draw_count)
				quit(1)
				return true
			var spun: float = absf(hub._hub_traffic.rotation - spin_at_start)
			print("stationed transports turned %.3f rad" % spun)
			if spun < 0.05:
				print("TEST_TRANSPORT_HUB_BUILDING: FAIL (nothing moved - a frozen hub trivially passes the redraw check)")
				quit(1)
				return true
			print("TEST_TRANSPORT_HUB_BUILDING: PASS")
			quit(0)
			return true
	return false