## T-1156 wave 1: tests for AtlasWindowNatureOverlay — the whole-body
## Layer-1 (river/basin/attractor) draw node on the zoom ladder. Covers
## request/response lifecycle (idempotent-per-body, staleness guard, decode
## tolerance for a missing river_class array) and the draw-gate wiring
## (rung/overlay-bar double-gate), NOT pixel-level draw output — the
## coordinate math itself is covered directly in
## test_atlas_window_geometry_nature.gd, matching test_atlas_window_overlay.gd's
## own "cache/lifecycle here, colorizer pixels elsewhere" split.
class_name TestAtlasWindowNatureOverlay
extends GdUnitTestSuite

const AtlasWindowNatureOverlay := preload("res://ui/implant/apps/atlas/atlas_window_nature_overlay.gd")


## Minimal viewer stub — AtlasWindowNatureOverlay only reaches the viewer
## through get_held_granularity_v2()/get_body_radius_km()/get_held_center()/
## get_held_n()/get_cell_pixel_size()/get_view_zoom()/is_overlay_visible(),
## the same duck-typed-viewer precedent test_atlas_window_overlay.gd's
## _ViewerStub already establishes for AtlasWindowOverlay. get_view_zoom()
## added post-live-eyeball (coordinator finding, 2026-07-23): _draw() now
## reads it for the zoom-compensated marker-size fix.
class _ViewerStub:
	var held_granularity_v2: String = "Region"
	var body_radius_km: float = 6371.0
	var held_center: Vector2i = Vector2i.ZERO
	var held_n: int = 64
	var view_zoom: float = 1.0
	var overlay_visibility: Dictionary = {"gen_rivers": true, "gen_basins": false, "gen_attractors": false}

	func get_held_granularity_v2() -> String:
		return held_granularity_v2

	func get_body_radius_km() -> float:
		return body_radius_km

	func get_held_center() -> Vector2i:
		return held_center

	func get_held_n() -> int:
		return held_n

	func get_cell_pixel_size() -> float:
		return 16.0

	func get_view_zoom() -> float:
		return view_zoom

	func is_overlay_visible(overlay_id: String) -> bool:
		return bool(overlay_visibility.get(overlay_id, false))


static func _mock_layer1(river_class: Variant = null) -> Dictionary:
	var rn: Dictionary = {
		"river_cells": [[10, 10], [20, 20], [30, 30]],
		"confluences": [[15, 15]],
		"mouths": [[40, 40]],
	}
	if river_class != null:
		rn["river_class"] = river_class
	return {
		"river_network": rn,
		"drainage_basins": [{"basin_id": 1, "boundary": [[0, 0], [0, 10], [10, 10], [10, 0]]}],
		"attractors": [{"position": [10, 10], "strength": 0.5, "attractor_type": "Oasis", "sub_biome": ""}],
		"grid_w": 256,
		"grid_h": 128,
	}


static func _mock_response(body_id: String, layer1: Variant) -> Dictionary:
	return {"body_id": body_id, "status": "Ready", "layer1": layer1}


## Window-only responses (the OTHER shape SimBridge.atlas_layers_received
## carries, per AtlasWindowRequest's own test conventions) must be ignored —
## `layer1` is null on that envelope, matching atlas_response_from_raw()'s
## "only one of layer1/district_window populated per response" contract.
static func _mock_window_response(body_id: String) -> Dictionary:
	return {"body_id": body_id, "status": "Ready", "district_window": {"n": 32}, "layer1": null}


func _make_overlay(viewer: Variant = null) -> Variant:
	var o = auto_free(AtlasWindowNatureOverlay.new(viewer if viewer != null else _ViewerStub.new()))
	add_child(o)
	return o


# =============================================================================
# Request lifecycle
# =============================================================================


func test_no_layer1_before_any_request() -> void:
	var o = _make_overlay()
	assert_that(o.get_layer1()).is_null()


func test_response_for_requested_body_is_adopted() -> void:
	var o = _make_overlay()
	o.request_layer1("GJ380c")
	var layer1: Dictionary = _mock_layer1()
	SimBridge.atlas_layers_received.emit(_mock_response("GJ380c", layer1))
	assert_that(o.get_layer1()).is_equal(layer1)


## Staleness guard: a response for a body this node never asked for (or
## navigated away from) must be ignored — same posture
## AtlasGenerationProxy.on_response()'s own body_id guard establishes.
func test_response_for_a_different_body_is_ignored() -> void:
	var o = _make_overlay()
	o.request_layer1("GJ380c")
	SimBridge.atlas_layers_received.emit(_mock_response("SomeOtherBody", _mock_layer1()))
	assert_that(o.get_layer1()).is_null()


## A window-shaped response (the windowed DistrictWindowLayer envelope,
## `layer1` null) must be ignored outright — this node only ever adopts the
## whole-body Layer-1 envelope.
func test_window_only_response_is_ignored() -> void:
	var o = _make_overlay()
	o.request_layer1("GJ380c")
	SimBridge.atlas_layers_received.emit(_mock_window_response("GJ380c"))
	assert_that(o.get_layer1()).is_null()


## request_layer1() for the SAME body id, after data has already arrived,
## must NOT clear the held data — a re-entrant enter_orbital() on the body
## already showing keeps drawing rivers instead of flashing them away.
func test_request_layer1_same_body_after_arrival_keeps_held_data() -> void:
	var o = _make_overlay()
	o.request_layer1("GJ380c")
	var layer1: Dictionary = _mock_layer1()
	SimBridge.atlas_layers_received.emit(_mock_response("GJ380c", layer1))
	o.request_layer1("GJ380c")
	assert_that(o.get_layer1()).is_equal(layer1)


## request_layer1() for a DIFFERENT body id must clear the previous body's
## held data immediately — the old body's rivers must never draw over the
## new body's terrain during the in-flight gap.
func test_request_layer1_different_body_clears_stale_data() -> void:
	var o = _make_overlay()
	o.request_layer1("GJ380c")
	SimBridge.atlas_layers_received.emit(_mock_response("GJ380c", _mock_layer1()))
	o.request_layer1("AnotherBody")
	assert_that(o.get_layer1()).override_failure_message(
		"switching bodies must clear the previous body's layer1 data immediately,"
		+ " not just leave it drawn until the new response arrives"
	).is_null()


func test_request_layer1_empty_body_id_is_a_noop() -> void:
	var o = _make_overlay()
	o.request_layer1("")
	SimBridge.atlas_layers_received.emit(_mock_response("", _mock_layer1()))
	assert_that(o.get_layer1()).override_failure_message(
		"an empty body_id must never be requested/adopted"
	).is_null()


# =============================================================================
# Decode tolerance — layer1 without river_class (pre-T-1156 payload / the
# graceful-fallback empty-array case, Dudley's #[serde(default)] contract).
# =============================================================================


## A response with NO river_class key at all (river_network dict omits it —
## the msgpack-decode equivalent of Dudley's serde default producing an
## empty Vec) must still be adopted without error; per-cell class then falls
## back to RIVER_CLASS_FALLBACK (TRUNK) at draw time, not a crash/decode failure.
func test_layer1_without_river_class_key_is_still_adopted() -> void:
	var o = _make_overlay()
	o.request_layer1("GJ380c")
	var layer1: Dictionary = _mock_layer1()  # no river_class arg -> key absent
	SimBridge.atlas_layers_received.emit(_mock_response("GJ380c", layer1))
	assert_that(o.get_layer1()).is_equal(layer1)
	assert_bool((o.get_layer1()["river_network"] as Dictionary).has("river_class")).is_false()


## An explicitly EMPTY river_class array (the actual wire shape Dudley's
## `#[serde(default)]` produces for a pre-T-1156 payload) must also decode
## without error and be adopted — the per-cell RIVER_CLASS_FALLBACK
## resolution this enables is exercised at draw time by
## test_atlas_window_nature_overlay_draw_smoke.gd (real-render smoke suite;
## draw_circle()/draw_rect() calls require a live render pass under this
## engine version — confirmed directly, matching
## test_atlas_window_overlay_draw_smoke.gd's own header doc on why a plain
## unit test cannot call `_draw()` outside one).
func test_layer1_with_empty_river_class_array_is_adopted() -> void:
	var o = _make_overlay()
	o.request_layer1("GJ380c")
	var layer1: Dictionary = _mock_layer1(PackedByteArray([]))
	SimBridge.atlas_layers_received.emit(_mock_response("GJ380c", layer1))
	assert_that(o.get_layer1()).is_equal(layer1)


## No viewer at all (viewer == null, matching AtlasWindowOverlay's own
## "viewer == null -> return" guard convention) is a legal, inert state —
## _draw()'s null-viewer early-return (BEFORE any draw_*() call) is safe to
## call directly since it never reaches the engine's draw-context requirement.
func test_draw_with_null_viewer_is_a_noop() -> void:
	var o = auto_free(AtlasWindowNatureOverlay.new(null))
	add_child(o)
	o._draw()
	assert_that(o.get_layer1()).is_null()


## grid_w/grid_h missing or zero (a malformed/degenerate layer1) must decode
## and adopt cleanly — _draw()'s own grid_w<=0/grid_h<=0 early-return (also
## BEFORE any draw_*() call) is exercised the same direct way.
func test_draw_with_zero_grid_dims_returns_before_any_draw_call() -> void:
	var o = _make_overlay()
	o.request_layer1("GJ380c")
	var layer1: Dictionary = _mock_layer1()
	layer1["grid_w"] = 0
	layer1["grid_h"] = 0
	SimBridge.atlas_layers_received.emit(_mock_response("GJ380c", layer1))
	o._draw()  # grid_w<=0 -> returns before touching the canvas — safe to call directly
	assert_that(o.get_layer1()).is_not_null()


## PR #195 review (Tyre I1) regression pin: every stroke-WIDTH argument in
## _draw_attractor_shape() must route through the pre-compensated `px_w`
## param, never a raw numeric literal — Godot multiplies stroke widths by the
## canvas scale exactly like radii, so a raw `2.0` rasterizes at ~0.01px at
## the Region orbital fit zoom (the identical sub-pixel failure the dot/ring
## zoom compensation fixed, missed on glyph outlines in the first pass). The
## draw-smoke suite cannot gate this (its own header documents the vacuous-
## pass mode under X11 BadMatch), so this is a SOURCE-SCAN pin: parse the
## overlay script's _draw_attractor_shape body and assert no draw_arc/
## draw_line call carries a bare numeric width literal. Crude but
## environment-independent, and it pins the exact regression class (someone
## reintroducing a literal width in a new glyph arm).
func test_attractor_shape_stroke_widths_are_never_raw_literals() -> void:
	var src: String = (
		FileAccess.get_file_as_string("res://ui/implant/apps/atlas/atlas_window_nature_overlay.gd")
	)
	var fn_start := src.find("func _draw_attractor_shape(")
	assert_that(fn_start).override_failure_message(
		"_draw_attractor_shape must exist in atlas_window_nature_overlay.gd"
	).is_not_equal(-1)
	var next_fn := src.find("\nfunc ", fn_start + 1)
	var body := src.substr(fn_start, (next_fn - fn_start) if next_fn != -1 else -1)
	var stroke_re := RegEx.new()
	# A draw_arc/draw_line call whose FINAL (width) argument is a bare numeric
	# literal: `, <digits[.digits]>)` at call end. px_w-scaled forms
	# (`px_w`, `2.0 * px_w`) do not match.
	stroke_re.compile("draw_(arc|line)\\([^\\n]*,\\s*\\d+(\\.\\d+)?\\s*\\)")
	var hits := stroke_re.search_all(body)
	var offenders: Array[String] = []
	for hit in hits:
		offenders.append(hit.get_string())
	assert_array(offenders).override_failure_message(
		"raw numeric stroke width(s) in _draw_attractor_shape — route through"
		+ " px_w (PR #195 Tyre I1): %s" % [offenders]
	).is_empty()