extends SceneTree

# Headless gameplay test: run with
#   godot --headless -s res://tests/test_research_lab_extractor_gate.gd
# Forgejo #75: a research_lab planet yields no resources at all (#63) - an
# extractor placed there would sit on an empty resource id forever. The
# build menu must refuse the placement and explain why, the same "explain
# the refusal" idiom used for every other build gate. Mirrors
# test_extractor_building.gd's own chunk-discovery/settle/confirm shape.

var main_scene: Node
var fleet: Node
var game_state: Node
var controller: Node
var target_chunk: Vector2i
var target_planet_id: String
var stage: int = 0
var elapsed: float = 0.0


func _initialize() -> void:
	var found: bool = false
	for x in range(-40, 40):
		for y in range(-40, 40):
			var chunk: Vector2i = Vector2i(x, y)
			if not WorldGen.has_planet_at_chunk(chunk):
				continue
			if WorldGen.planet_data_at_chunk(chunk).definition_id == "research_lab":
				target_chunk = chunk
				found = true
				break
		if found:
			break
	if not found:
		print("TEST_RESEARCH_LAB_EXTRACTOR_GATE: FAIL (no research_lab chunk found to test with)")
		quit(1)
		return

	game_state = root.get_node("GameState")
	game_state.rocks = 200
	game_state.buildings.clear()
	game_state.extractors.clear()
	game_state.planet_capture.clear()
	target_planet_id = "chunk:%d:%d" % [target_chunk.x, target_chunk.y]
	# This test is about the resource-id gate, not conquest itself (see
	# test_planet_conquest_gate) - pre-conquer the target directly.
	game_state.register_capture_points(target_planet_id, 1, "research_lab")
	game_state.mark_point_captured(target_planet_id, 0)
	game_state.reset_progression()
	for node in GameState.SKILL_TREE:
		game_state.unlocked.append(node.id)

	main_scene = load("res://world/Main.tscn").instantiate()
	root.add_child(main_scene)
	fleet = main_scene.get_node("Fleet")
	controller = main_scene.get_node("BuildController")


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

			var near: Vector2 = WorldGen.chunk_origin(target_chunk) + Vector2.ONE * WorldGen.CHUNK_SIZE * 0.5
			for ship in fleet.ships:
				ship.position = near
			fleet.move_to(near)
			elapsed = 0.0
			stage = 1
			return false
		1:
			var planet_field: Node = main_scene.get_node("PlanetField")
			if elapsed < planet_field.check_interval + 0.2:
				return false
			if not planet_field.populated_chunks.has(target_chunk):
				return _fail("the research_lab planet never spawned")
			var planet: Node2D = planet_field.populated_chunks[target_chunk][0]
			if String(planet.resource_type) != "":
				return _fail("test setup error: chosen planet's resource_type is '%s', expected empty" \
					% planet.resource_type)
			for ship in fleet.ships:
				ship.position = planet.position
			fleet.move_to(planet.position)
			elapsed = 0.0
			stage = 2
			return false
		2:
			if elapsed < 0.3:
				return false
			controller._on_build_pressed()
			if not controller.build_menu.visible:
				return _fail("the build menu did not open over the planet")

			var before: int = game_state.extractors.size()
			controller._show_building_info(GameState.BUILDING_EXTRACTOR)
			controller._confirm_build()
			if game_state.extractors.size() != before:
				return _fail("an extractor was built on a research_lab planet")
			if not ("nothing to extract" in controller.build_menu.status.text):
				return _fail("refusal did not explain itself, status was '%s'" % controller.build_menu.status.text)
			print("extractor refused on a research_lab planet, explained: '%s'" % controller.build_menu.status.text)

			print("TEST_RESEARCH_LAB_EXTRACTOR_GATE: PASS")
			quit(0)
			return true
	return false


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