extends SceneTree

# Headless gameplay test: run with
#   godot --headless -s res://tests/test_build_menu_icons.gd
# The build menu is where a structure is chosen, so each option has to look
# like the thing it builds. It used to pick from the generic icon set: the
# mothership and the command centre both drew a folded MAP glyph, the ship
# crafter drew a bare triangle and the extractor drew the same "+" as the
# button that opens the menu - so redrawing the placed buildings changed
# nothing about how they looked at the point of choosing one.
#
# Verifies, for every option in the menu:
#   1. it uses its own dedicated building glyph
#   2. no two options share an icon
#   3. `icon` is a real Icon value that _draw actually handles

var scene: Node

const EXPECTED: Dictionary = {
	"MothershipButton": IconButton.Icon.MOTHERSHIP,
	"CrafterButton": IconButton.Icon.CRAFTER,
	"CommandButton": IconButton.Icon.COMMAND_CENTER,
	"ExtractorButton": IconButton.Icon.EXTRACTOR,
}


func _initialize() -> void:
	scene = load("res://world/Main.tscn").instantiate()
	root.add_child(scene)


func _process(_delta: float) -> bool:
	var menu: Node = scene.get_node("UI/BuildMenu")
	var seen: Array = []
	var ok: bool = true

	for name in EXPECTED:
		var button: IconButton = menu.get_node_or_null(name)
		if button == null:
			print("%s: MISSING" % name)
			ok = false
			continue
		var expected: int = EXPECTED[name]
		var matches: bool = button.icon == expected
		# An out-of-range int would silently draw an empty frame, since
		# _draw's match simply falls through.
		var in_range: bool = button.icon >= 0 and button.icon < IconButton.Icon.size()
		print("%s: icon=%d expected=%d ok=%s in_range=%s" % [
			name, button.icon, expected, matches, in_range
		])
		if not (matches and in_range):
			ok = false
		if button.icon in seen:
			print("%s: icon %d is already used by another option" % [name, button.icon])
			ok = false
		seen.append(button.icon)

	if ok:
		print("TEST_BUILD_MENU_ICONS: PASS")
		quit(0)
	else:
		print("TEST_BUILD_MENU_ICONS: FAIL (build options are not using their own building glyphs)")
		quit(1)
	return true