settled-reach/client/tests/test_step_canvas_request.gd

## T-1182 tests: step_canvas_request.gd — request lifecycle (cache hit/miss,
## staleness gate, the extent ECHO rule). Live mode is required for
## SimBridge.request_step_canvas() to actually send (test_mode short-circuits
## it), so these tests exercise on_response()/request_now() against a
## directly-constructed StepCanvasRequest node without a live bridge
## connection — request_now() on a cache MISS calls into SimBridge, which is
## a silent no-op in test_mode (SimBridge.test_mode defaults true outside
## SR_LIVE=1), so no live server is needed for these assertions.
class_name TestStepCanvasRequest
extends GdUnitTestSuite

const StepCanvasRequestScript := preload("res://ui/implant/apps/atlas/step_canvas/step_canvas_request.gd")


func test_cache_hit_emits_canvas_ready_synchronously_with_no_pending_state() -> void:
	var req = auto_free(StepCanvasRequestScript.new())
	add_child(req)
	var canvas := {"width": 64, "height": 64}
	req.get_cache().put("GJ1c", "District", Vector2i(0, 0), Vector2i(64, 64), canvas)

	var received: Array = []
	req.canvas_ready.connect(func(c: Dictionary) -> void: received.append(c))
	req.request_now("GJ1c", "District", Vector2i(0, 0), Vector2i(64, 64))

	assert_int(received.size()).is_equal(1)
	assert_that(received[0]).is_equal(canvas)
	assert_bool(req.is_pending()).is_false()


func test_cache_miss_sets_pending_true() -> void:
	var req = auto_free(StepCanvasRequestScript.new())
	add_child(req)
	req.request_now("GJ1c", "Chunk", Vector2i(0, 0), Vector2i(64, 64))
	assert_bool(req.is_pending()).is_true()


func test_on_response_ignores_a_response_for_a_different_body() -> void:
	var req = auto_free(StepCanvasRequestScript.new())
	add_child(req)
	req.request_now("GJ1c", "District", Vector2i(0, 0), Vector2i(64, 64))

	var received: Array = []
	req.canvas_ready.connect(func(c: Dictionary) -> void: received.append(c))
	req.on_response(
		{
			"body_id": "SomeOtherBody",
			"rung": "District",
			"center": Vector2i(0, 0),
			"min_wl_m": 0,
			"status": "Ready",
			"canvas": {"width": 1},
		}
	)
	assert_int(received.size()).is_equal(0)


func test_on_response_ignores_a_response_for_a_different_rung() -> void:
	var req = auto_free(StepCanvasRequestScript.new())
	add_child(req)
	req.request_now("GJ1c", "District", Vector2i(0, 0), Vector2i(64, 64))

	var received: Array = []
	req.canvas_ready.connect(func(c: Dictionary) -> void: received.append(c))
	req.on_response(
		{
			"body_id": "GJ1c",
			"rung": "Chunk",  # a different rung answering — must be ignored
			"center": Vector2i(0, 0),
			"min_wl_m": 0,
			"status": "Ready",
			"canvas": {"width": 1},
		}
	)
	assert_int(received.size()).is_equal(0)


func test_on_response_ignores_a_stale_center_for_a_fixed_rung() -> void:
	var req = auto_free(StepCanvasRequestScript.new())
	add_child(req)
	req.request_now("GJ1c", "District", Vector2i(0, 0), Vector2i(64, 64))

	var received: Array = []
	req.canvas_ready.connect(func(c: Dictionary) -> void: received.append(c))
	req.on_response(
		{
			"body_id": "GJ1c",
			"rung": "District",
			"center": Vector2i(999, 999),  # answers a since-panned-away-from center
			"min_wl_m": 0,
			"status": "Ready",
			"canvas": {"width": 1},
		}
	)
	assert_int(received.size()).is_equal(0)


## Global ignores center/extent server-side — a Global response's staleness
## check must NOT compare center at all (an echoed (0,0) sentinel must not
## be rejected as "stale" against whatever was requested).
func test_on_response_global_rung_ignores_center_in_staleness_check() -> void:
	var req = auto_free(StepCanvasRequestScript.new())
	add_child(req)
	req.request_now("GJ1c", "Global", Vector2i.ZERO, Vector2i.ZERO)

	var received: Array = []
	req.canvas_ready.connect(func(c: Dictionary) -> void: received.append(c))
	req.on_response(
		{
			"body_id": "GJ1c",
			"rung": "Global",
			"center": Vector2i.ZERO,
			"extent": Vector2i.ZERO,
			"min_wl_m": 0,
			"status": "Ready",
			"canvas": {"width": 19_139, "height": 9_569},
		}
	)
	assert_int(received.size()).is_equal(1)


## The extent ECHO rule (T-1181 wire addendum, mandatory): held extent comes
## from the RESPONSE's own echoed extent, never the requested one — a
## server-side clamp can shrink the actual canvas below what was asked for.
func test_on_response_holds_the_echoed_extent_not_the_requested_one() -> void:
	var req = auto_free(StepCanvasRequestScript.new())
	add_child(req)
	req.request_now("GJ1c", "Chunk", Vector2i(0, 0), Vector2i(9_999, 9_999))

	req.on_response(
		{
			"body_id": "GJ1c",
			"rung": "Chunk",
			"center": Vector2i(0, 0),
			"extent": Vector2i(3_840, 2_160),  # server-clamped echo, smaller than requested
			"min_wl_m": 0,
			"status": "Ready",
			"canvas": {"width": 3_840, "height": 2_160},
		}
	)
	assert_that(req.get_held_extent()).is_equal(Vector2i(3_840, 2_160))


## Global's held extent comes from the canvas's own width/height (the wire
## extent echo is a fixed (0,0) sentinel for that rung — nothing to read).
func test_on_response_global_held_extent_derives_from_canvas_dimensions() -> void:
	var req = auto_free(StepCanvasRequestScript.new())
	add_child(req)
	req.request_now("GJ1c", "Global", Vector2i.ZERO, Vector2i.ZERO)

	req.on_response(
		{
			"body_id": "GJ1c",
			"rung": "Global",
			"center": Vector2i.ZERO,
			"extent": Vector2i.ZERO,
			"min_wl_m": 0,
			"status": "Ready",
			"canvas": {"width": 19_139, "height": 9_569},
		}
	)
	assert_that(req.get_held_extent()).is_equal(Vector2i(19_139, 9_569))


func test_on_response_ready_with_null_canvas_retries_rather_than_adopting() -> void:
	var req = auto_free(StepCanvasRequestScript.new())
	add_child(req)
	req.request_now("GJ1c", "District", Vector2i(0, 0), Vector2i(64, 64))

	var received: Array = []
	req.canvas_ready.connect(func(c: Dictionary) -> void: received.append(c))
	req.on_response(
		{
			"body_id": "GJ1c",
			"rung": "District",
			"center": Vector2i(0, 0),
			"min_wl_m": 0,
			"status": "Ready",
			"canvas": null,
		}
	)
	assert_int(received.size()).is_equal(0)
	assert_bool(req.is_pending()).is_true()


func test_on_response_not_found_gives_up_immediately() -> void:
	var req = auto_free(StepCanvasRequestScript.new())
	add_child(req)
	req.request_now("GJ1c", "Chunk", Vector2i(0, 0), Vector2i(64, 64))
	req.on_response({"body_id": "GJ1c", "rung": "Chunk", "status": "NotFound"})
	assert_bool(req.is_pending()).is_false()


func test_on_response_stores_a_fresh_ready_canvas_in_the_cache() -> void:
	var req = auto_free(StepCanvasRequestScript.new())
	add_child(req)
	req.request_now("GJ1c", "District", Vector2i(5, 5), Vector2i(64, 64))
	req.on_response(
		{
			"body_id": "GJ1c",
			"rung": "District",
			"center": Vector2i(5, 5),
			"extent": Vector2i(64, 64),
			"min_wl_m": 0,
			"status": "Ready",
			"canvas": {"width": 64, "height": 64},
		}
	)
	assert_bool(req.get_cache().has("GJ1c", "District", Vector2i(5, 5), Vector2i(64, 64))).is_true()