extends SceneTree

# Headless gameplay test: run with
#   godot --headless -s res://tests/test_biome_generation.gd
# Verifies WorldGen's biome-per-chunk function is deterministic (querying
# the same chunk twice gives the same biome) and that the seeded noise
# field actually produces both biome types within a reasonably large
# sampled area - a regression guard against a threshold tuned so one biome
# never appears at all.

func _initialize() -> void:
	var deterministic_ok: bool = true
	for i in range(20):
		var chunk: Vector2i = Vector2i(i * 3 - 10, i * 2 - 5)
		var a: int = WorldGen.biome_at_chunk(chunk)
		var b: int = WorldGen.biome_at_chunk(chunk)
		if a != b:
			deterministic_ok = false
			print("FAIL: chunk %s gave %d then %d" % [chunk, a, b])

	var space_count: int = 0
	var asteroid_count: int = 0
	for x in range(-25, 25):
		for y in range(-25, 25):
			var biome: int = WorldGen.biome_at_chunk(Vector2i(x, y))
			if biome == WorldGen.Biome.SPACE:
				space_count += 1
			elif biome == WorldGen.Biome.ASTEROID_FIELD:
				asteroid_count += 1

	print("deterministic_ok=%s space_count=%d asteroid_count=%d" % [deterministic_ok, space_count, asteroid_count])

	if deterministic_ok and space_count > 0 and asteroid_count > 0:
		print("TEST_BIOME_GENERATION: PASS")
		quit(0)
	else:
		print("TEST_BIOME_GENERATION: FAIL")
		quit(1)