## T-1182 tests: StepCanvasLegend — smoke coverage (PR #203 review, Hoshe
## note). Not the retired atlas_window_legend.gd's own richer suite (that
## file never had a dedicated test — its coverage lived entirely inside
## AtlasWindowViewer's own suites, now retired); this pins the panel's basic
## lifecycle/content contract directly.
class_name TestStepCanvasLegend
extends GdUnitTestSuite

const LegendScript := preload("res://ui/implant/apps/atlas/step_canvas/step_canvas_legend.gd")
const StepCanvasTransport := preload("res://ui/implant/apps/atlas/step_canvas/step_canvas_transport.gd")

## Same Tier-2/3 isolation as test_step_canvas_viewer.gd's _make_viewer()
## (T-1193 first slice): the default disk-cache root is machine-shared, and a
## warm cache delivers canvases into tests entered on real body ids.
const TEST_DISK_CACHE_ROOT := "user://test_step_canvas_legend_cache/"


func _make_viewer() -> StepCanvasViewer:
	var v: StepCanvasViewer = auto_free(StepCanvasViewer.new())
	v.disk_cache_root_override = TEST_DISK_CACHE_ROOT
	return v


func test_legend_starts_hidden_before_refresh() -> void:
	var v: StepCanvasViewer = _make_viewer()
	add_child(v)
	var legend = LegendScript.new(v)
	auto_free(legend)
	assert_bool(legend.visible).is_false()


func test_refresh_makes_the_legend_visible_and_populates_content() -> void:
	var v: StepCanvasViewer = _make_viewer()
	add_child(v)
	v.enter({"body_id": "GJ380c", "body_radius_km": 6238.4}, {})
	var legend = LegendScript.new(v)
	add_child(legend)
	legend.refresh()
	assert_bool(legend.visible).is_true()
	assert_int(legend.get_implant_children().size()).override_failure_message(
		"refresh() must populate at least the always-on morphology/glaciation sections"
	).is_greater(0)


## refresh() is a no-op (does not crash) when the legend has no viewer —
## defensive guard against a construction-order mistake.
func test_refresh_without_a_viewer_does_not_crash() -> void:
	var legend = LegendScript.new(null)
	auto_free(legend)
	legend.refresh()
	assert_bool(legend.visible).is_false()


## Toggling a gen_* overlay on changes the legend's content (the active
## toggle section appears) without crashing — the same "no active toggle by
## default, one section per active toggle" contract the retired
## atlas_window_legend.gd's own refresh() doc described.
func test_refresh_reflects_the_active_overlay_toggle() -> void:
	var v: StepCanvasViewer = _make_viewer()
	add_child(v)
	v.enter({"body_id": "GJ380c", "body_radius_km": 6238.4}, {})
	var legend = LegendScript.new(v)
	add_child(legend)
	legend.refresh()
	var rows_before: int = legend.get_implant_children().size()

	v.set_overlay_visible("gen_dw_temp", true)
	legend.refresh()
	var rows_after: int = legend.get_implant_children().size()

	assert_int(rows_after).override_failure_message(
		"activating a toggle overlay must add its own legend section"
	).is_greater(rows_before)


func test_reposition_sets_a_fixed_panel_margin_position() -> void:
	var v: StepCanvasViewer = _make_viewer()
	add_child(v)
	var legend = LegendScript.new(v)
	auto_free(legend)
	legend.reposition()
	assert_that(legend.position).is_equal(Vector2(LegendScript.PANEL_MARGIN, 60.0))


## T-1192 review fix: RESERVED_COLUMN_PX is now a direct read of
## StepCanvasTransport.LEGEND_COLUMN_PX (not an independently-typed
## literal), so a const-vs-const cross-pin test would be structurally
## unable to fail — it is the SAME value by construction. What's still
## worth proving directly is the geometric guarantee that constant is FOR:
## the legend's own ACTUAL laid-out right edge (`reposition()`'s position.x
## + the panel's real minimum width) must land at or before the reserved
## column, with room to spare — never right up against it, and certainly
## never past it into where the canvas is centered from.
func test_legend_actual_right_edge_stays_inside_the_reserved_column() -> void:
	var v: StepCanvasViewer = _make_viewer()
	add_child(v)
	var legend = LegendScript.new(v)
	auto_free(legend)
	legend.reposition()

	var actual_right_edge: float = legend.position.x + legend.custom_minimum_size.x
	assert_float(actual_right_edge).override_failure_message(
		"the legend's real laid-out right edge must stay inside the column"
		+ " StepCanvasViewer reserves for it, with margin to spare"
	).is_less(StepCanvasTransport.LEGEND_COLUMN_PX)