extends RefCounted
## Headless tests for the procedural world, navigation mesh, and phase lighting.

const WorldBuilder := preload("res://src/game/world_builder.gd")
const Rules := preload("res://src/core/rules.gd")
const GameManager := preload("res://src/game/game_manager.gd")

func test_navmesh_built() -> bool:
	var root := Node3D.new()
	WorldBuilder.new(root).build()
	var region: NavigationRegion3D = root.find_child("NavRegion", true, false) as NavigationRegion3D
	if region == null:
		return TestUtils.fail("no NavRegion in world")
	var mesh: NavigationMesh = region.navigation_mesh
	if mesh == null:
		return TestUtils.fail("NavRegion has no navigation mesh")
	var a := TestUtils.check(mesh.get_polygon_count() > 0, "navmesh has polygons")
	var b := TestUtils.check(mesh.get_vertices().size() >= 4, "navmesh has vertices")
	root.free()
	return a and b

func test_phase_lighting_config_covered() -> bool:
	var ok := true
	for phase in [Rules.Phase.EARLY, Rules.Phase.MIDDAY, Rules.Phase.EVENING, Rules.Phase.LATE]:
		var cfg: Variant = GameManager.PHASE_LIGHTING.get(phase, null)
		if not (cfg is Dictionary):
			ok = false
			continue
		for key in ["sun_energy", "sun_angle", "sun_color", "sky_top", "sky_horizon", "ambient", "night"]:
			if not (cfg as Dictionary).has(key):
				ok = false
	return TestUtils.check(ok, "all four phases have a full lighting config")

func test_street_lamps_and_marquee_built() -> bool:
	var root := Node3D.new()
	var builder := WorldBuilder.new(root)
	builder.build()
	var a := TestUtils.check(builder._street_lamps.size() >= 2, "street lamps built")
	var b := TestUtils.check(builder.marquee_label != null, "marquee label built")
	# Night mode raises bulb emission; day mode drops it.
	builder.set_night_mode(true)
	var night_on := builder._lamp_bulb_mats[0].emission_energy_multiplier > 1.0
	builder.set_night_mode(false)
	var day_off := builder._lamp_bulb_mats[0].emission_energy_multiplier <= 0.5
	root.free()
	return a and b and TestUtils.check(night_on, "lamps brighten at night") and TestUtils.check(day_off, "lamps dim in daylight")

func test_asset_textures_present_and_pow2() -> bool:
	var required := [
		"res://assets/textures/brick_facade.png",
		"res://assets/textures/concrete.png",
		"res://assets/textures/asphalt.png",
		"res://assets/textures/awning.png",
		"res://assets/textures/skyline.png",
		"res://assets/textures/vignette.png",
		"res://assets/textures/icons/flashlight_on.png",
		"res://assets/textures/icons/door_locked.png",
		"res://assets/textures/icons/wand.png",
		"res://assets/textures/icons/rec_dot.png",
		"res://assets/textures/cards/id_card.png",
		"res://assets/textures/cards/wristband.png",
		"res://assets/textures/cards/ticket.png",
		"res://assets/textures/cards/credential.png",
		"res://assets/textures/cards/guest_list.png",
	]
	for path in required:
		if not FileAccess.file_exists(path):
			return TestUtils.fail("missing generated asset: %s — run tools/generate_textures.py" % path)
	var img := Image.new()
	for path in required:
		if img.load(path) != OK:
			return TestUtils.fail("cannot decode asset: %s" % path)
		var w := img.get_width()
		var h := img.get_height()
		if w > 1024 or h > 1024:
			return TestUtils.fail("asset too large: %s (%dx%d)" % [path, w, h])
		if (w & (w - 1)) != 0 or (h & (h - 1)) != 0:
			return TestUtils.fail("asset not power-of-two: %s (%dx%d)" % [path, w, h])
	return true

func test_steps_have_colliders() -> bool:
	## Steps were visual-only and the guard walked through them (TODO).
	var root := Node3D.new()
	WorldBuilder.new(root).build()
	var steps := root.find_child("Steps", true, false)
	var a := TestUtils.check(steps != null, "Steps node exists")
	var b := TestUtils.check(steps is StaticBody3D, "Steps are a physics body")
	var shape_count := 0
	if steps is StaticBody3D:
		var body := steps as StaticBody3D
		shape_count = body.get_shape_owners().size()
	var c := TestUtils.check(shape_count >= 5, "four treads + landing have colliders (got %d)" % shape_count)
	root.free()
	return a and b and c

func test_skyline_backdrop_uses_alpha() -> bool:
	## The opaque skyline texture made the plane render as a black slab (TODO).
	var root := Node3D.new()
	var builder := WorldBuilder.new(root)
	builder.build()
	var backdrop := root.find_child("SkylineBackdrop", true, false)
	var a := TestUtils.check(backdrop != null, "SkylineBackdrop exists")
	var mat: StandardMaterial3D = builder._skyline_mat
	var b := TestUtils.check(mat != null, "skyline material captured")
	var c := TestUtils.check(
		mat != null and mat.transparency != BaseMaterial3D.TRANSPARENCY_DISABLED,
		"skyline material uses alpha, not an opaque slab")
	root.free()
	return a and b and c

func test_door_indicator_built() -> bool:
	var root := Node3D.new()
	var builder := WorldBuilder.new(root)
	builder.build()
	var a := TestUtils.check(builder.door_indicator != null, "door indicator mesh exists")
	if builder.door_indicator != null:
		builder.set_door_locked(true)
		var mat: StandardMaterial3D = builder.door_indicator.material_override as StandardMaterial3D
		var b := TestUtils.check(mat != null and mat.albedo_color.r > 0.5, "indicator turns red when locked")
		builder.set_door_locked(false)
		var c := TestUtils.check(mat != null and mat.albedo_color.g > 0.5, "indicator turns green when open")
		root.free()
		return a and b and c
	root.free()
	return a