extends SceneTree

# Forgejo #224: a structure may not be built on top of one that is already
# there.
#
# It matters beyond the look of it. BuildingField decides which structure the
# fleet is standing on by testing the centroid against interact_radius and
# returning the FIRST match, so two structures inside one another make that a
# question of list order rather than of where the player flew - you would fly
# to your workshop and open the crafter.
#
# Covers:
#   A. the spot a structure already occupies is refused
#   B. clear of it, the same build goes through
#   C. a unique structure can still be rebuilt where the old one stands,
#      because the old one is what is being replaced
#   D. and a REFUSED rebuild does not demolish the existing one first

var game_state: Node
var scene: Node
var controller: Node
var fleet: Node2D
var elapsed: float = 0.0
var stage: int = 0


func _initialize() -> void:
	game_state = root.get_node("GameState")
	game_state.buildings.clear()
	game_state.extractors.clear()
	game_state.reset_progression()
	game_state.reset_new_game()
	game_state.intro_active = false
	game_state.reset_quests()
	game_state.rocks = 100000
	game_state.bank_inventory.set_amount(GameState.RESOURCE_GAS, 100000)
	game_state.bank_inventory.set_amount(GameState.RESOURCE_ENERGY, 100000)
	scene = load("res://world/Main.tscn").instantiate()
	root.add_child(scene)
	current_scene = scene
	controller = scene.get_node("BuildController")
	fleet = scene.get_node("Fleet")


func _process(delta: float) -> bool:
	elapsed += delta
	if elapsed < 0.4:
		return false

	var sep: float = GameState.MIN_BUILDING_SEPARATION

	# _confirm_build() returns SILENTLY on a locked structure, which would
	# make every refusal below look like the separation rule working when it
	# was only the unlock gate. Unlock what this test builds, and assert it.
	for type in [GameState.BUILDING_COMMAND_CENTER, GameState.BUILDING_MOTHERSHIP,
			GameState.BUILDING_SHIP_CRAFTER]:
		var node_id: String = game_state.research_node_for_building(type)
		if node_id != "" and not game_state.is_unlocked(node_id):
			game_state.unlocked.append(node_id)
		if not game_state.is_building_unlocked(type):
			return _fail("'%s' is still locked, so a refusal would prove nothing" % type)

	# --- A. the occupied spot is refused --------------------------------
	game_state.buildings.clear()
	game_state.add_building(GameState.BUILDING_SHIP_CRAFTER, Vector2.ZERO)

	if game_state.building_blocking(Vector2.ZERO).is_empty():
		return _fail("a structure's own position reads as a clear spot")
	# Just inside the separation, and just outside it.
	if game_state.building_blocking(Vector2(sep - 1.0, 0.0)).is_empty():
		return _fail("a spot %.0f units away is not blocked, but the rule is %.0f" % [sep - 1.0, sep])
	if not game_state.building_blocking(Vector2(sep + 1.0, 0.0)).is_empty():
		return _fail("a spot %.0f units away is blocked, but the rule is %.0f" % [sep + 1.0, sep])
	var blocker: Dictionary = game_state.building_blocking(Vector2.ZERO)
	if String(blocker.get("type", "")) != GameState.BUILDING_SHIP_CRAFTER:
		return _fail("the blocking structure is reported as '%s'" % blocker.get("type", ""))
	print("a spot inside %.0f units of a structure is refused, outside it is clear" % sep)

	# --- B. and the whole build path agrees -----------------------------
	# On top of the crafter: refused, and nothing is built or spent.
	fleet.teleport_to(Vector2.ZERO)
	var before: int = game_state.buildings.size()
	controller.pending_build_type = GameState.BUILDING_COMMAND_CENTER
	controller._confirm_build()
	if game_state.buildings.size() != before:
		return _fail("a structure was built on top of the crafter")
	print("the build path refuses it too: %s" % controller.build_menu.status.text)

	# Clear of it: the same build goes through.
	fleet.teleport_to(Vector2(sep * 3.0, 0.0))
	controller.pending_build_type = GameState.BUILDING_COMMAND_CENTER
	controller._confirm_build()
	if game_state.buildings.size() != before + 1:
		return _fail("the same build was refused on a clear spot")
	print("clear of it, the same build goes through")

	# --- C. a unique structure replaces itself in place -----------------
	game_state.buildings.clear()
	game_state.add_building(GameState.BUILDING_MOTHERSHIP, Vector2.ZERO)
	fleet.teleport_to(Vector2.ZERO)
	if not game_state.building_blocking(Vector2.ZERO, GameState.BUILDING_MOTHERSHIP).is_empty():
		return _fail("a unique structure blocks its own replacement")
	controller.pending_build_type = GameState.BUILDING_MOTHERSHIP
	controller._confirm_build()
	if game_state.buildings.size() != 1:
		return _fail("rebuilding the mothership in place left %d structures" % game_state.buildings.size())
	if String(game_state.buildings[0].type) != GameState.BUILDING_MOTHERSHIP:
		return _fail("the rebuilt structure is not a mothership")
	print("a unique structure can still be rebuilt where the old one stood")

	# --- D. a refused rebuild demolishes nothing ------------------------
	# The mothership is unique and is removed before the new one is placed.
	# Something ELSE in the way has to be caught before that demolition, or
	# the player is left with neither.
	game_state.buildings.clear()
	var keep: int = game_state.add_building(GameState.BUILDING_MOTHERSHIP, Vector2.ZERO)
	game_state.add_building(GameState.BUILDING_SHIP_CRAFTER, Vector2(sep * 4.0, 0.0))
	fleet.teleport_to(Vector2(sep * 4.0, 0.0))
	controller.pending_build_type = GameState.BUILDING_MOTHERSHIP
	controller._confirm_build()
	if game_state.find_building(keep).is_empty():
		return _fail("a refused rebuild demolished the existing mothership - the player is left with neither")
	if game_state.buildings.size() != 2:
		return _fail("a refused rebuild changed the structure count to %d" % game_state.buildings.size())
	print("a refused rebuild leaves the existing structure standing")

	print("TEST_BUILDING_SEPARATION: PASS")
	quit(0)
	return true


func _fail(message: String) -> bool:
	print("TEST_BUILDING_SEPARATION: FAIL (%s)" % message)
	quit(1)
	return true