## PR #192 cold-start dossier (BUG 2): RegionalScreen.enter() tests. Split
## into its own file rather than folded into test_atlas_zoom_ladder.gd —
## these exercise the NAV-LAYER re-entry guard (RegionalScreen itself), not
## AtlasWindowViewer's own zoom-ladder mechanics that suite already owns.
class_name TestRegionalScreen
extends GdUnitTestSuite

const AtlasWindowRequest := preload("res://ui/implant/apps/atlas/atlas_window_request.gd")

## Dudley's WINDOW_GRANULARITY_REGION_KEY sentinel — mirrors
## test_atlas_zoom_ladder.gd's own constant (see that file's doc for why the
## real wire value matters, not a convenient placeholder).
const SERVER_LEGACY_GRANULARITY_REGION_SENTINEL: int = 4294967295


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


## BUG 2 root cause: ImplantApp._on_screen_changed() calls enter()
## UNCONDITIONALLY on every screen_changed, including a repeat
## nav.push("regional", ...) landing on the SAME screen already showing
## (reachable from more than one input path — body-click, panel+Enter — and
## plausible for a player to trigger twice on a slow cold server before the
## first descent settles). Without RegionalScreen's own guard, a repeat
## entry re-ran the FULL enter_orbital() teardown/rebuild — tearing down
## every in-flight tile request node and rebuilding fresh (null-window) ones
## — orphaning whatever had already arrived, plus refreshing the legend
## from scratch each time (the confirmed ~10x legend stack). Proven here by
## an ARRIVED tile's data: a teardown+rebuild resets it to null; a genuine
## no-op leaves it exactly as it was — `is_same()` on `_tile_set` itself
## can't tell (that Node is a fixed field, never reassigned — only its
## INTERNAL request children get torn down and rebuilt).
func test_repeat_enter_for_the_same_body_does_not_orphan_an_arrived_tile() -> void:
	var screen: RegionalScreen = auto_free(RegionalScreen.new())
	add_child(screen)
	var body: Dictionary = {"body_id": "GJ380c", "body_radius_km": 6238.4}
	screen.enter({"body": body, "system": {}})

	var tile_set = screen._viewer.get_tile_set()
	var first_tile_center: Vector2i = tile_set.get_tiles()[0]["center"]
	var arrived_window: Dictionary = {
		"center": [first_tile_center.x, first_tile_center.y],
		"n": AtlasWindowRequest.SERVER_DISTRICT_WINDOW_MAX_N_REGION,
		"granularity": SERVER_LEGACY_GRANULARITY_REGION_SENTINEL,
		"granularity_v2": "Region",
		"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]),
	}
	SimBridge.atlas_layers_received.emit(_mock_response("GJ380c", arrived_window))
	assert_that(tile_set.get_tiles()[0]["window"]).override_failure_message(
		"sanity: the first tile's response must have been adopted before the repeat enter()"
	).is_equal(arrived_window)

	screen.enter({"body": body, "system": {}})

	assert_that(screen._viewer.get_tile_set().get_tiles()[0]["window"]).override_failure_message(
		"a repeat enter() for the SAME body must not orphan an already-arrived"
		+ " tile — a teardown+rebuild resets every tile's window back to null,"
		+ " which is the confirmed source of the cold-start legend stacking bug"
	).is_equal(arrived_window)


## A GENUINE body change (different body_id) must still enter fresh — the
## guard is scoped to "the same body, re-entered", never a blanket "ignore
## the second enter() call ever".
func test_enter_for_a_different_body_still_re_enters() -> void:
	var screen: RegionalScreen = auto_free(RegionalScreen.new())
	add_child(screen)
	screen.enter({"body": {"body_id": "GJ380c", "body_radius_km": 6238.4}, "system": {}})

	screen.enter({"body": {"body_id": "OtherBody", "body_radius_km": 100.0}, "system": {}})

	assert_str(screen._viewer.get_body_id()).override_failure_message(
		"a genuinely different body must still re-enter — not be swallowed by"
		+ " the same-body guard"
	).is_equal("OtherBody")


## get_body_id() itself: empty before any entry, the entered body's id after.
func test_get_body_id_reflects_the_currently_held_body() -> void:
	var v: AtlasWindowViewer = auto_free(AtlasWindowViewer.new())
	add_child(v)
	assert_str(v.get_body_id()).is_equal("")
	v.enter_orbital({"body_id": "GJ380c", "body_radius_km": 6238.4}, {})
	assert_str(v.get_body_id()).is_equal("GJ380c")