extends SceneTree

# Headless gameplay test: run with
#   godot --headless -s res://tests/test_world_map_ui.gd
# Verifies the map UI: hidden by default, opening it recenters on the
# fleet, a single-finger drag while the map is open pans the map content
# instead of leaking through to the gameplay fleet-move/zoom controls, and
# closing hides it again.
#
# Open and close are driven by TAPPING THE BUTTONS, not by calling open_map()
# and close_map(). Calling them directly is what let this ship broken: the
# map took over touch input while it was visible and swallowed it in _input(),
# which runs before the GUI system - so the close button never saw the touch
# and the map could not be closed at all on a touch-only device. Every part
# of that was reachable from a test; none of it was reached, because the test
# closed the map by calling the method the button was failing to reach.
#
# The open tap doubles as the harness check: if a synthetic tap could not be
# delivered at all, the close tap would "fail" for a reason that has nothing
# to do with the map.

const POS_TOLERANCE: float = 3.0

var main_scene: Node
var fleet: Node
var camera: Camera2D
var world_map: Control
var content: Node2D
var map_button: Control
var close_button: Control
var fleet_target_before: Vector2
var camera_zoom_before: float
var content_pos_before_drag: Vector2
var elapsed: float = 0.0
var stage: int = 0


func _initialize() -> void:
	var packed: PackedScene = load("res://world/Main.tscn")
	main_scene = packed.instantiate()
	root.add_child(main_scene)
	fleet = main_scene.get_node("Fleet")
	camera = main_scene.get_node("Camera2D")
	world_map = main_scene.get_node("UI/WorldMap")
	content = main_scene.get_node("UI/WorldMap/MapContent")
	map_button = main_scene.get_node("UI/MapButton")
	close_button = main_scene.get_node("UI/WorldMap/CloseButton")


func _process(delta: float) -> bool:
	elapsed += delta
	match stage:
		0:
			if elapsed < 0.1:
				return false
			if world_map.visible:
				print("TEST_WORLD_MAP_UI: FAIL (map visible by default)")
				quit(1)
				return true
			_tap(map_button)
			stage = 1
			elapsed = 0.0
			return false
		1:
			if elapsed < 0.1:
				return false
			var fleet_local: Vector2 = fleet.get_centroid() * content.WORLD_TO_LOCAL
			var viewport_center: Vector2 = main_scene.get_viewport_rect().size / 2.0
			var expected_content_pos: Vector2 = viewport_center - fleet_local * content.scale.x
			var recenter_ok: bool = content.position.distance_to(expected_content_pos) <= POS_TOLERANCE
			print("open_visible=%s content_pos=%s expected=%s recenter_ok=%s" % [
				world_map.visible, content.position, expected_content_pos, recenter_ok
			])
			if not world_map.visible:
				print("TEST_WORLD_MAP_UI: FAIL (tapping the map button did not open the map)")
				quit(1)
				return true
			if not (world_map.visible and recenter_ok):
				print("TEST_WORLD_MAP_UI: FAIL (open/recenter)")
				quit(1)
				return true

			fleet_target_before = fleet.fleet_target
			camera_zoom_before = camera.zoom.x
			content_pos_before_drag = content.position
			_touch(0, true, Vector2(200, 600))
			stage = 2
			elapsed = 0.0
			return false
		2:
			if elapsed < 0.1:
				return false
			_drag(0, Vector2(260, 640))
			stage = 3
			elapsed = 0.0
			return false
		3:
			if elapsed < 0.1:
				return false
			_touch(0, false, Vector2(260, 640))

			# Headless mode's placeholder window doesn't match the configured
			# viewport size, so Godot's own stretch transform rescales raw
			# synthetic touch coordinates by some environment-specific factor
			# before delivery - checking an exact pixel count here would be
			# testing that artifact, not the pan logic. Instead verify the
			# drag moved the map in the right DIRECTION and roughly the right
			# PROPORTION (dragged twice as far on X as Y, so the pan should
			# reflect that same ratio), which the scaling factor cancels out of.
			var pan_delta: Vector2 = content.position - content_pos_before_drag
			var moved_ok: bool = pan_delta.length() > 1.0
			var direction_ok: bool = pan_delta.x > 0.0 and pan_delta.y > 0.0
			var ratio_ok: bool = pan_delta.y != 0.0 and abs((pan_delta.x / pan_delta.y) - 1.5) <= 0.1
			var pan_ok: bool = moved_ok and direction_ok and ratio_ok
			var fleet_untouched: bool = fleet.fleet_target == fleet_target_before
			var zoom_untouched: bool = camera.zoom.x == camera_zoom_before
			print("pan_delta=%s moved_ok=%s direction_ok=%s ratio_ok=%s fleet_untouched=%s zoom_untouched=%s" % [
				pan_delta, moved_ok, direction_ok, ratio_ok, fleet_untouched, zoom_untouched
			])
			if not (pan_ok and fleet_untouched and zoom_untouched):
				print("TEST_WORLD_MAP_UI: FAIL (pan/isolation)")
				quit(1)
				return true

			# The subject: a tap on the close button, delivered exactly the
			# way the tap that opened the map was.
			_tap(close_button)
			stage = 4
			elapsed = 0.0
			return false
		4:
			if elapsed < 0.1:
				return false
			var closed_ok: bool = not world_map.visible
			print("closed_by_button=%s map_button_back=%s" % [closed_ok, map_button.visible])
			if closed_ok and not map_button.visible:
				print("TEST_WORLD_MAP_UI: FAIL (map closed but its open button never came back)")
				quit(1)
				return true
			if closed_ok:
				print("TEST_WORLD_MAP_UI: PASS")
				quit(0)
			else:
				print("TEST_WORLD_MAP_UI: FAIL (did not close)")
				quit(1)
			return true
	return false


# Taps a control at the centre of its own rect, pushed straight into the
# viewport in local coordinates. Deliberately NOT Input.parse_input_event with
# a hand-written position: headless rescales those through the stretch
# transform (see the note in stage 3), which is fine for the pan check below -
# it only cares about direction and ratio - but useless for hitting a target.
# Its own touch index, away from the 0 the pan check below uses. push_input()
# is delivered immediately while Input.parse_input_event() is queued for the
# next frame, so the two can arrive out of order - and a release whose index
# the map is still holding belongs to the map, correctly, which would make
# this read as a broken button when nothing is broken. A finger cannot be in
# two places at once, so distinct indices is what really happens anyway.
const TAP_INDEX: int = 7


func _tap(control: Control) -> void:
	var at: Vector2 = control.get_global_rect().get_center()
	for pressed in [true, false]:
		var ev := InputEventScreenTouch.new()
		ev.index = TAP_INDEX
		ev.pressed = pressed
		ev.position = at
		control.get_viewport().push_input(ev, true)


func _touch(index: int, pressed: bool, pos: Vector2) -> void:
	var ev: InputEventScreenTouch = InputEventScreenTouch.new()
	ev.index = index
	ev.pressed = pressed
	ev.position = pos
	Input.parse_input_event(ev)


func _drag(index: int, pos: Vector2) -> void:
	var ev: InputEventScreenDrag = InputEventScreenDrag.new()
	ev.index = index
	ev.position = pos
	Input.parse_input_event(ev)