extends SceneTree
## Guardrail for the on-screen joystick's self-healing. The reported bug is a stick that
## "disappears / goes non-responsive": a touchend dropped during a resize/orientation flip (or
## an app backgrounding) leaves _stick_active stuck true, so the ghost hint hides and no new
## stick can start — and the bull keeps coasting on the held move actions. touch_controls.gd
## now resets on relayout + focus-out, prunes orphaned touches, and lets the latest left-zone
## touch re-acquire the stick. This drives synthetic touch events and asserts the stick never
## stays stranded and never leaves movement held.
## Run: godot --headless --script res://tests/touch_controls_test.gd

const _MOVE := [&"move_forward", &"move_back", &"move_left", &"move_right"]

var _pass := 0
var _fail := 0
var _tc: CanvasLayer


func _init() -> void:
	_run.call_deferred()


func _ok(c: bool, m: String) -> void:
	if c:
		_pass += 1
		print("  PASS: ", m)
	else:
		_fail += 1
		print("  FAIL: ", m)


func _press(index: int, pos: Vector2) -> void:
	var e := InputEventScreenTouch.new()
	e.index = index
	e.position = pos
	e.pressed = true
	_tc._input(e)


func _release(index: int, pos: Vector2) -> void:
	var e := InputEventScreenTouch.new()
	e.index = index
	e.position = pos
	e.pressed = false
	_tc._input(e)


func _drag(index: int, pos: Vector2) -> void:
	var e := InputEventScreenDrag.new()
	e.index = index
	e.position = pos
	_tc._input(e)


func _any_move_held() -> bool:
	for a: StringName in _MOVE:
		if Input.is_action_pressed(a):
			return true
	return false


# A point safely inside the left-hand joystick zone (independent of viewport size), plus the
# same point pushed a full radius "up" so the stick engages move_forward.
func _stick_origin() -> Vector2:
	return _tc._stick_zone.position + _tc._stick_zone.size * Vector2(0.25, 0.5)


func _run() -> void:
	var dp: Node = root.get_node("/root/DP")
	var controls: Node = root.get_node("/root/Controls")
	dp.call("set_value", "force_touch_controls", true)
	_ok(controls.call("use_touch_ui"), "force flag makes use_touch_ui() true (touch UI live)")

	# Headless boots a 64x64 root viewport, which collapses every UI rect on top of each other.
	# Give it a real phone-ish landscape size so the joystick zone / buttons lay out sanely.
	root.size = Vector2i(1152, 648)
	_tc = (load("res://touch_controls.gd") as Script).new()
	root.add_child(_tc)
	await process_frame   # _ready builds _surface and runs the first _relayout
	_tc._relayout()       # ensure the layout reflects the size set above

	var o := _stick_origin()
	var up := o + Vector2(0.0, -_tc._stick_radius)

	# (a) A resize mid-drag (dropped touchend) must not strand the stick or keep the bull moving.
	_tc._reset_touch_state()
	_press(0, o)
	_drag(0, up)
	_ok(_tc._stick_active and _any_move_held(), "drag engages the stick and holds movement")
	_tc._relayout()   # the resize/orientation flip that used to swallow the release
	_ok(not _tc._stick_active, "a relayout mid-drag stands the stick down (not stranded)")
	_ok(not _any_move_held(), "movement is released on relayout (bull doesn't coast)")

	# (b) App backgrounded / focus lost — same self-heal via the notification hook.
	_tc._reset_touch_state()
	_press(0, o)
	_drag(0, up)
	_tc._notification(Node.NOTIFICATION_APPLICATION_FOCUS_OUT)
	_ok(not _tc._stick_active and not _any_move_held(), "focus-out clears the stick and movement")

	# (c) A stranded stick self-heals: with finger 0's release lost, a fresh finger 1 in the zone
	# re-acquires the stick; finger 0's late release must NOT kill finger 1's stick.
	_tc._reset_touch_state()
	_press(0, o)                       # finger 0 owns the stick
	_press(1, o + Vector2(20, 10))     # finger 1 lands while 0 is still (wrongly) held → takes over
	_ok(_tc._stick_active and _tc._stick_index == 1, "latest left-zone touch re-acquires the stick")
	_release(0, o)                     # the stranded finger finally reports up
	_ok(_tc._stick_active and _tc._stick_index == 1, "a superseded finger's release doesn't end the stick")
	_release(1, o)
	_ok(not _tc._stick_active, "releasing the owning finger ends the stick")

	# (d) Watchdog: a touch that vanishes from tracking (no release event at all) is pruned.
	_tc._reset_touch_state()
	_press(0, o)
	_tc._touches.erase(0)              # simulate the finger silently disappearing
	_tc._process(0.016)               # prune runs each frame
	_ok(not _tc._stick_active and not _any_move_held(), "watchdog prunes a vanished touch and frees the stick")

	_finish()


func _finish() -> void:
	print("Results: %d passed, %d failed" % [_pass, _fail])
	quit(1 if _fail > 0 else 0)