extends SceneTree

# Headless gameplay test: run with
#   godot --headless -s res://tests/test_map_building_markers.gd
# Forgejo issue #11: a building the player has placed must appear on the
# world map. Without it the map showed explored chunks, planets and the
# fleet, but nothing the player had actually built - so there was no way to
# find your own base again once you had flown away from it.
#
# Buildings are not tied to a chunk (they are placed freely in space), so
# they cannot ride along with the chunk markers and need their own pass.
#
# --headless has no GPU and draws no pixels, so this cannot assert on what
# was rendered. It asserts on building_markers(), the step that turns
# GameState.buildings into map-local marker data, which is the part that
# _draw() then simply stamps out.
#
# Verifies:
#   1. no buildings -> no markers (so a passing count is not just "always 3")
#   2. every placed building produces exactly one marker
#   3. markers land at the building's world position scaled into map space
#   4. the three building types are told apart by colour, rather than all
#      being drawn as the same anonymous dot

var scene: Node
var game_state: Node
var map_content: Node2D
var stage: int = 0

const MOTHERSHIP_AT: Vector2 = Vector2(2000.0, -1200.0)
const CRAFTER_AT: Vector2 = Vector2(-800.0, 400.0)
const COMMAND_AT: Vector2 = Vector2(150.0, 3000.0)


func _initialize() -> void:
	game_state = root.get_node("GameState")
	game_state.buildings.clear()
	game_state.extractors.clear()
	scene = load("res://world/Main.tscn").instantiate()
	root.add_child(scene)
	map_content = scene.get_node("UI/WorldMap/MapContent")


func _process(_delta: float) -> bool:
	match stage:
		0:
			# Nothing built yet: the map must show no building markers at all.
			var empty: Array = map_content.building_markers()
			if not empty.is_empty():
				print("TEST_MAP_BUILDING_MARKERS: FAIL (%d markers with nothing built)" % empty.size())
				quit(1)
				return true

			game_state.add_building(GameState.BUILDING_MOTHERSHIP, MOTHERSHIP_AT)
			game_state.add_building(GameState.BUILDING_SHIP_CRAFTER, CRAFTER_AT)
			game_state.add_building(GameState.BUILDING_COMMAND_CENTER, COMMAND_AT)
			stage = 1
			return false
		1:
			var markers: Array = map_content.building_markers()
			print("markers=%d for %d buildings" % [markers.size(), game_state.buildings.size()])
			if markers.size() != 3:
				print("TEST_MAP_BUILDING_MARKERS: FAIL (expected one marker per building)")
				quit(1)
				return true

			var scale: float = map_content.WORLD_TO_LOCAL
			var expected: Dictionary = {
				GameState.BUILDING_MOTHERSHIP: MOTHERSHIP_AT * scale,
				GameState.BUILDING_SHIP_CRAFTER: CRAFTER_AT * scale,
				GameState.BUILDING_COMMAND_CENTER: COMMAND_AT * scale,
			}
			var colours: Array = []
			for m in markers:
				if not expected.has(m.type):
					print("TEST_MAP_BUILDING_MARKERS: FAIL (unexpected marker type %s)" % m.type)
					quit(1)
					return true
				var want: Vector2 = expected[m.type]
				if m.position.distance_to(want) > 0.001:
					print("%s marker at %s, expected %s" % [m.type, m.position, want])
					print("TEST_MAP_BUILDING_MARKERS: FAIL (marker is not where the building is)")
					quit(1)
					return true
				colours.append(m.color)

			# Three buildings drawn in one indistinguishable colour would
			# satisfy every check above and still be useless to read.
			if colours[0] == colours[1] or colours[1] == colours[2] or colours[0] == colours[2]:
				print("colours=%s" % [colours])
				print("TEST_MAP_BUILDING_MARKERS: FAIL (building types are not visually distinct)")
				quit(1)
				return true

			print("all 3 markers positioned correctly, colours distinct: %s" % [colours])
			print("TEST_MAP_BUILDING_MARKERS: PASS")
			quit(0)
			return true
	return false