## T-1150 (PR #191 review, Hoshe 4): atlas_window_request.gd had NO test file
## at all before this — direct coverage of the granularity/min_wl_m staleness
## guard, the n-clamp mirror (Tyre C1), and the old-server-shape default
## disposition. Follows test_atlas_window_viewer.gd's own
## "AtlasWindowRequest — cache reuse" section conventions (same
## instantiation pattern: `AtlasWindowRequest.new(owner_stub)`, `add_child()`
## for the debounce Timer, hand-built response dicts) rather than
## re-inventing a shape.
class_name TestAtlasWindowRequest
extends GdUnitTestSuite

# atlas_window_request.gd has no class_name (review #8 precedent throughout
# this cluster) — preloaded once here, not re-load()ed per test (gdlint
# duplicated-load).
const AtlasWindowRequest := preload("res://ui/implant/apps/atlas/atlas_window_request.gd")


## Build a hand-authored DistrictWindowLayer dict, granularity-aware
## (T-1150) — mirrors test_atlas_window_viewer.gd's own _mock_window(), with
## granularity/min_wl_m added as optional params so callers can build both
## rungs' echo shapes with one helper.
static func _mock_window(
	center: Vector2i, n: int = 2, granularity: int = 1, min_wl_m: int = 0
) -> Dictionary:
	return {
		"center": [center.x, center.y],
		"n": n,
		"granularity": granularity,
		"min_wl_m": min_wl_m,
		"morphology": PackedByteArray([8, 14, 0, 1]),
		"elev_q": PackedByteArray([40, 90, 5, 60]),
		"temp_dc": [120, 95, -32768, 60],
		"moisture_q": PackedByteArray([50, 30, 90, 20]),
		"vegetation": PackedByteArray([2, 1, 6, 3]),
		"glaciation": PackedByteArray([0, 0, 1, 2]),
	}


static func _mock_response(body_id: String, window: Variant) -> Dictionary:
	return {"body_id": body_id, "status": "Ready", "district_window": window}


func _make_request() -> Variant:
	var owner_stub := RefCounted.new()
	var req = auto_free(AtlasWindowRequest.new(owner_stub))
	add_child(req)
	return req


# =============================================================================
# (a) granularity mismatch on the echo -> dropped as stale
# =============================================================================


## The mandatory item-(a) case: request_now() asks at the default district
## granularity (1); a response echoing granularity=4 (quarter) for the SAME
## center/n must be dropped as stale, not accepted — a different rung's
## derive answering a request for a different rung is exactly as stale as a
## mismatched center (T-1150 extends §2's guard to this axis).
func test_on_response_with_mismatched_granularity_is_dropped_as_stale() -> void:
	var req = _make_request()
	req.request_now("GJ380c", Vector2i(2, 2), 2)
	assert_bool(req.is_pending()).is_true()

	var quarter_window: Dictionary = _mock_window(Vector2i(2, 2), 2, 4, 0)
	req.on_response(_mock_response("GJ380c", quarter_window))

	assert_bool(req.is_pending()).override_failure_message(
		"a granularity-mismatched response must be dropped as stale, leaving the district request still pending"
	).is_true()


# =============================================================================
# (b) old-server-shape response (no granularity/min_wl_m keys) -> defaults
# =============================================================================


## A response from a hypothetical pre-T-1150 server (or any response whose
## district_window dict simply omits the new keys) must decode granularity
## as district (1) and min_wl_m as 0 via the same defaulting on_response()
## already applies — and since request_now()'s own defaults are identical,
## the response is ACCEPTED, not treated as stale just because two keys are
## missing.
func test_on_response_missing_granularity_and_min_wl_defaults_and_is_accepted() -> void:
	var req = _make_request()
	req.request_now("GJ380c", Vector2i(3, 3), 2)
	assert_bool(req.is_pending()).is_true()

	# Old-shape window: no "granularity"/"min_wl_m" keys at all.
	var old_shape_window := {
		"center": [3, 3],
		"n": 2,
		"morphology": PackedByteArray([8, 14, 0, 1]),
		"elev_q": PackedByteArray([40, 90, 5, 60]),
		"temp_dc": [120, 95, -32768, 60],
		"moisture_q": PackedByteArray([50, 30, 90, 20]),
		"vegetation": PackedByteArray([2, 1, 6, 3]),
		"glaciation": PackedByteArray([0, 0, 1, 2]),
	}
	req.on_response(_mock_response("GJ380c", old_shape_window))

	assert_bool(req.is_pending()).override_failure_message(
		(
			"an old-server-shape response (missing granularity/min_wl_m) must "
			+ "default to district/0 and be ACCEPTED, not dropped as stale"
		)
	).is_false()

	var received: Array = []
	req.window_ready.connect(func(w: Dictionary) -> void: received.append(w))
	# Re-request the same (body, center, n) — must now be a cache hit, proving
	# on_response() actually stored the old-shape window under the
	# district/0 key, not silently discarding it.
	req.request_now("GJ380c", Vector2i(3, 3), 2)
	assert_int(received.size()).is_equal(1)
	assert_bool(req.is_pending()).is_false()


# =============================================================================
# (c) n-clamp mirror (Tyre C1) — quarter n=32 stores clamped n=16
# =============================================================================


## **Item (c) as literally scoped by the ticket** ("the clamp-mirror from
## item 1"): `_clamp_window_n_mirror()` reproduces the server's
## `clamp_window_n(raw_n, granularity)` bit-for-bit, INCLUDING the quarter
## n=32 -> 16 case — pinned directly against the static helper, independent
## of the request/response plumbing (`request_now()` has no public
## "request quarter" entry point today; T-1150 is struct/key plumbing only,
## requesting quarter is T-1153's job — see the class-level docstring on
## `_clamp_window_n_mirror()` for why calling `request_now()` at district
## granularity can never itself exercise the quarter branch: it unconditionally
## resets `_granularity` to district BEFORE clamping, by design, since no
## caller can ask for quarter yet).
func test_clamp_window_n_mirror_matches_server_formula_at_quarter_n32() -> void:
	assert_int(AtlasWindowRequest._clamp_window_n_mirror(32, 4)).is_equal(16)
	# District granularity: the per-axis cap (64) governs, matching the
	# server's clamp_window_n_district_granularity_uses_per_axis_cap test.
	assert_int(AtlasWindowRequest._clamp_window_n_mirror(640, 1)).is_equal(64)
	# Small n well under budget at quarter granularity stays unclamped,
	# matching clamp_window_n_quarter_granularity_leaves_small_n_unclamped.
	assert_int(AtlasWindowRequest._clamp_window_n_mirror(8, 4)).is_equal(8)


## **Item (c), the request/response half:** `request_now()` actually WIRES
## the mirror in (not just defines it) — a request for a district-legal but
## per-axis-oversized `n` (e.g. 640, mirroring the server's own
## `DISTRICT_WINDOW_MAX_N*10` oversized-request test) stores the CLAMPED
## `_n=64`, so a server response echoing the server's OWN clamped n=64 is
## ACCEPTED, not rejected as stale for "not matching" the raw 640 that was
## asked for. This is the exact n-clamp/echo/staleness triangle Tyre C1
## flagged, exercised through the reachable (district) path today; the
## quarter-specific n=32->16 number is pinned by the formula test above since
## no public API can drive quarter through `request_now()` yet.
func test_oversized_n_request_stores_clamped_n_and_accepts_matching_echo() -> void:
	var req = _make_request()
	req.request_now("GJ380c", Vector2i(4, 4), 640)

	assert_int(req._n).override_failure_message(
		(
			"request_now() must mirror the server's clamp_window_n(640, granularity=1) "
			+ "== 64 BEFORE storing _n, not store the raw requested 640"
		)
	).is_equal(64)
	assert_bool(req.is_pending()).is_true()

	# The server's real response for this request echoes n=64 (its own
	# clamp_window_n() result) — must be ACCEPTED, not stale.
	var clamped_echo: Dictionary = _mock_window(Vector2i(4, 4), 64, 1, 0)
	req.on_response(_mock_response("GJ380c", clamped_echo))

	assert_bool(req.is_pending()).override_failure_message(
		(
			"a response echoing the CLAMPED n=64 must be accepted, since _n was "
			+ "already clamped to 64 before the request fired"
		)
	).is_false()