extends SceneTree

# Headless gameplay test: run with
#   godot --headless -s res://tests/test_crafter_animation.gd
# The ship crafter is drawn as a factory with a hull being assembled on the
# line. Verifies:
#   1. a crafter spawned the normal way (BuildingField, from GameState)
#      actually animates - the animation is what tells the player what the
#      building does. The mothership animates too (reactor core, orbiting
#      satellites)
#   2. the command centre stays static, because per-frame redraws of art
#      that never changes were a measurable framerate cost earlier on
#   3. the hull assembles progressively over the cycle rather than popping
#      in whole, and every piece is on before the assembly phase ends
#   4. the cycle loops without anim_time growing without bound

var scene: Node
var game_state: Node
var field: Node
var stage: int = 0
var elapsed: float = 0.0
var crafter: Node2D
var time_at_start: float = 0.0


func _initialize() -> void:
	game_state = root.get_node("GameState")
	game_state.rocks = 200
	game_state.buildings.clear()
	game_state.extractors.clear()

	scene = load("res://Main.tscn").instantiate()
	root.add_child(scene)
	field = scene.get_node("BuildingField")


func _find(type: String) -> Node2D:
	for b in field.spawned:
		if is_instance_valid(b) and b.building_type == type:
			return b
	return null


func _process(delta: float) -> bool:
	elapsed += delta
	match stage:
		0:
			scene.get_node("AsteroidField").set_process(false)
			scene.get_node("EnemySpawner").set_process(false)
			field.place(GameState.BUILDING_SHIP_CRAFTER, Vector2(500.0, 0.0))
			field.place(GameState.BUILDING_MOTHERSHIP, Vector2(-500.0, 0.0))
			field.place(GameState.BUILDING_COMMAND_CENTER, Vector2(0.0, 500.0))
			elapsed = 0.0
			stage = 1
			return false
		1:
			# Spawning is deferred, so give the tree a frame to attach them.
			if elapsed < 0.2:
				return false
			var crafter_building: Node2D = _find(GameState.BUILDING_SHIP_CRAFTER)
			if crafter_building == null:
				print("TEST_CRAFTER_ANIMATION: FAIL (crafter never spawned)")
				quit(1)
				return true
			crafter = crafter_building.visual

			var animated: bool = crafter.is_processing()
			var mothership_building: Node2D = _find(GameState.BUILDING_MOTHERSHIP)
			var mothership: Node2D = mothership_building.visual if mothership_building != null else null
			var mothership_animates: bool = mothership != null and mothership.is_processing()
			var command_building: Node2D = _find(GameState.BUILDING_COMMAND_CENTER)
			var command: Node2D = command_building.visual if command_building != null else null
			var command_static: bool = command != null and not command.is_processing()
			print("crafter animates=%s mothership animates=%s command centre static=%s" % [
				animated, mothership_animates, command_static
			])
			if not (animated and mothership_animates and command_static):
				print("TEST_CRAFTER_ANIMATION: FAIL (wrong buildings are animating)")
				quit(1)
				return true

			# --- the hull assembles piece by piece ------------------------
			var total: int = crafter.SHIP_PARTS.size()
			var counts: Array = []
			for p in [0.0, 0.1, 0.35, 0.55, 0.9, 1.0]:
				counts.append(crafter.attached_part_count(p))
			var progressive: bool = counts[0] == 0 and counts[-1] == total
			for i in range(1, counts.size()):
				if counts[i] < counts[i - 1]:
					progressive = false
			# Nothing may still be missing when the welding phase ends, or
			# the hull would launch half-built.
			var complete_before_launch: bool = crafter.attached_part_count(1.0) == total
			print("parts attached across the phase: %s (of %d) progressive=%s" % [
				counts, total, progressive
			])
			if not (progressive and complete_before_launch and counts[1] < total):
				print("TEST_CRAFTER_ANIMATION: FAIL (hull does not build up gradually)")
				quit(1)
				return true

			time_at_start = crafter.anim_time
			elapsed = 0.0
			stage = 2
			return false
		2:
			if elapsed < 0.4:
				return false
			var advanced: bool = crafter.anim_time != time_at_start
			var bounded: bool = crafter.anim_time >= 0.0 and crafter.anim_time < crafter.CYCLE
			print("anim_time %.3f -> %.3f (cycle %.2f) advanced=%s bounded=%s" % [
				time_at_start, crafter.anim_time, crafter.CYCLE, advanced, bounded
			])
			if advanced and bounded:
				print("TEST_CRAFTER_ANIMATION: PASS")
				quit(0)
			else:
				print("TEST_CRAFTER_ANIMATION: FAIL (animation clock stalled or ran away)")
				quit(1)
			return true
	return false