extends SceneTree

# Headless gameplay test: run with
#   godot --headless -s res://tests/test_planet_landing_proximity.gd
# Verifies flying the fleet onto a planet's landing radius makes
# PlanetField.get_planet_fleet_is_on() return it, and that flying back
# away clears it - without the planet destroying the ships (planets are
# landable, not hazards).

var main_scene: Node
var fleet: Node
var planet_field: Node
var target_chunk: Vector2i
var elapsed: float = 0.0
var stage: int = 0


func _initialize() -> void:
	var found: bool = false
	for x in range(-15, 15):
		for y in range(-15, 15):
			var chunk: Vector2i = Vector2i(x, y)
			# Not a black hole: it destroys ships on contact, and this
			# scan takes the FIRST planet it finds. That used to be the gas
			# giant guaranteed in the origin chunk; with that guarantee gone
			# the scan can land the fleet on something that kills it, which
			# is not what either of these tests is about.
			if WorldGen.has_planet_at_chunk(chunk) \
					and String(WorldGen.planet_data_at_chunk(chunk).get("definition_id", "")) != "black_hole":
				target_chunk = chunk
				found = true
				break
		if found:
			break

	if not found:
		print("FAIL: could not find any chunk with a planet to test with")
		quit(1)
		return

	var packed: PackedScene = load("res://world/Main.tscn")
	main_scene = packed.instantiate()
	root.add_child(main_scene)
	fleet = main_scene.get_node("Fleet")
	planet_field = main_scene.get_node("PlanetField")


func _process(delta: float) -> bool:
	elapsed += delta
	match stage:
		0:
			# target_chunk is guaranteed ASTEROID_FIELD biome (a
			# prerequisite for having a planet), so regular drifting
			# asteroids/enemies could also spawn nearby and destroy a ship
			# mid-test - isolate it, same as other focused tests do.
			#
			# This has to happen on the first tick, not in _initialize():
			# a node's set_process(false) call made before it has fully
			# finished entering the tree doesn't reliably stick - the
			# engine's own (deferred) tree-entry finalization, which runs
			# strictly after _ready(), can silently reset it back to
			# enabled. Here, at the point _ready() is already confirmed
			# complete (fleet.ships is reliably populated by now), it's safe.
			main_scene.get_node("AsteroidField").set_process(false)
			main_scene.get_node("EnemySpawner").set_process(false)
			# Crew the fleet HERE rather than in _initialize(): work done
			# there can be undone by the engine's deferred tree-entry
			# finalization, the same reason the set_process(false) calls
			# above live at this point. A new game flies one vessel now.
			root.get_node("GameState").unlocked.append_array(["wing", "squadron", "armada"])
			fleet.spawn_ships(5, Vector2.ZERO)
			# Silencing the field does not remove what it already placed, and
			# those keep drifting - a rock taking the fleet out mid-test reads
			# here as a landing failure.
			for rock in get_nodes_in_group("asteroids"):
				if is_instance_valid(rock):
					rock.queue_free()

			# PlanetField only scans chunks near the fleet's CURRENT
			# position, so it never even looks at target_chunk unless the
			# fleet is already nearby - move it there first.
			var near_pos: Vector2 = WorldGen.chunk_origin(target_chunk) + Vector2.ONE * WorldGen.CHUNK_SIZE * 0.5
			for ship in fleet.ships:
				ship.position = near_pos
			fleet.move_to(near_pos)
			elapsed = 0.0
			stage = 1
			return false
		1:
			# Wait for PlanetField to spawn the target planet.
			if elapsed < planet_field.check_interval + 0.1:
				return false
			if not planet_field.populated_chunks.has(target_chunk):
				print("TEST_PLANET_LANDING_PROXIMITY: FAIL (planet never spawned)")
				quit(1)
				return true
			elapsed = 0.0
			stage = 2
			return false
		2:
			# Fly the fleet exactly onto the planet.
			var planet: Node2D = planet_field.populated_chunks[target_chunk][0]
			for ship in fleet.ships:
				ship.position = planet.position
			fleet.move_to(planet.position)
			elapsed = 0.0
			stage = 3
			return false
		3:
			if elapsed < 0.1:
				return false
			var planet: Node2D = planet_field.populated_chunks[target_chunk][0]
			var query_ok: bool = planet_field.get_planet_fleet_is_on() == planet
			var ships_alive: bool = fleet.ships.size() == 5
			print("query_ok=%s ships_alive=%s" % [query_ok, ships_alive])
			if not (query_ok and ships_alive):
				print("TEST_PLANET_LANDING_PROXIMITY: FAIL (landing detection)")
				quit(1)
				return true

			var far_pos: Vector2 = planet.position + Vector2(5000, 5000)
			for ship in fleet.ships:
				ship.position = far_pos
			fleet.move_to(far_pos)
			elapsed = 0.0
			stage = 4
			return false
		4:
			if elapsed < 0.1:
				return false
			var query_cleared_ok: bool = planet_field.get_planet_fleet_is_on() == null
			print("query_cleared_ok=%s" % query_cleared_ok)
			if query_cleared_ok:
				print("TEST_PLANET_LANDING_PROXIMITY: PASS")
				quit(0)
			else:
				print("TEST_PLANET_LANDING_PROXIMITY: FAIL (leaving detection)")
				quit(1)
			return true
	return false