class_name SurfaceMaterials
extends RefCounted
## Shared surface recipes for the procedural world (ADR-0012).
##
## Godot's `StandardMaterial3D` defaults are flat: every surface comes out with
## the same roughness and a plain albedo, which is what made the street read as
## grey boxes. These helpers give each surface a physically plausible profile
## (brick is rough, glass is smooth, metal is metallic) and keep the textures,
## UV scaling, and texture filtering in one place so the world builder, the NPC
## avatars, and the props all look like one scene.

## Realism-pass picks (tools/scene_concepts.py promote): brick, sidewalk pavers and
## asphalt replaced the flat first-generation tiles. Normal maps carry the mortar,
## paver joints and aggregate that Compatibility cannot get from screen space.
const PICK_DIR := "res://assets/textures/ai/game_ready/v2/picks/"
const T_BRICK := preload(PICK_DIR + "brick_facade.png")
const T_CONCRETE := preload(PICK_DIR + "sidewalk_pavers.png")
const T_ASPHALT := preload(PICK_DIR + "asphalt.png")
const T_ASPHALT_WET := preload(PICK_DIR + "asphalt_wet.png")
const T_AWNING := preload(PICK_DIR + "awning_canvas.png")
const T_BRICK_NORMAL := preload(PICK_DIR + "brick_facade_normal.png")
const T_CONCRETE_NORMAL := preload(PICK_DIR + "sidewalk_pavers_normal.png")
const T_ASPHALT_NORMAL := preload(PICK_DIR + "asphalt_normal.png")
const T_ASPHALT_WET_NORMAL := preload(PICK_DIR + "asphalt_wet_normal.png")

## Roughness / metallic pairs per surface role. Exposed so tests and tooling can
## assert the profiles instead of hard-coding numbers twice.
const PROFILES := {
	"brick": {"roughness": 0.88, "metallic": 0.0},
	"concrete": {"roughness": 0.94, "metallic": 0.0},
	"asphalt": {"roughness": 0.72, "metallic": 0.0},
	"awning": {"roughness": 0.80, "metallic": 0.0},
	"stone": {"roughness": 0.88, "metallic": 0.0},
	"metal": {"roughness": 0.32, "metallic": 0.75},
	"painted_metal": {"roughness": 0.48, "metallic": 0.35},
	"wood": {"roughness": 0.70, "metallic": 0.0},
	"cloth": {"roughness": 0.85, "metallic": 0.0},
	"skin": {"roughness": 0.62, "metallic": 0.0},
	"glass": {"roughness": 0.12, "metallic": 0.10},
	"rubber": {"roughness": 0.95, "metallic": 0.0},
}

## NPC material slot: keep the baked albedo/normal maps from the imported model
## and tint them with the seed-driven outfit colour.
static func npc_slot(source: Material, tint: Color) -> StandardMaterial3D:
	var material := source.duplicate() as StandardMaterial3D
	if material == null:
		material = StandardMaterial3D.new()
	material.albedo_color = tint
	return material

## Wire a baked AO map (red channel) into every surface of an imported mesh.
## Compatibility has no SSAO, so the library assets carry their own AO.
static func apply_ao(mesh_instance: MeshInstance3D, texture: Texture2D) -> void:
	if mesh_instance == null or mesh_instance.mesh == null or texture == null:
		return
	for index in mesh_instance.mesh.get_surface_count():
		var base := mesh_instance.get_surface_override_material(index)
		if base == null:
			base = mesh_instance.mesh.surface_get_material(index)
		var material := base.duplicate() as StandardMaterial3D
		if material == null:
			continue
		material.ao_enabled = true
		material.ao_texture = texture
		material.ao_texture_channel = BaseMaterial3D.TEXTURE_CHANNEL_RED
		mesh_instance.set_surface_override_material(index, material)

static func load_ao(path: String) -> Texture2D:
	if not ResourceLoader.exists(path):
		return null
	return ResourceLoader.load(path) as Texture2D

static func profile(role: String) -> Dictionary:
	return PROFILES.get(role, PROFILES["concrete"])

## Base textured surface with a named profile.
static func textured(texture: Texture2D, tint: Color, uv_scale: Vector2,
		role: String = "concrete", normal: Texture2D = null) -> StandardMaterial3D:
	var mat := StandardMaterial3D.new()
	mat.albedo_texture = texture
	if normal != null:
		mat.normal_enabled = true
		mat.normal_texture = normal
		mat.normal_scale = 0.8
	mat.albedo_color = tint
	mat.uv1_scale = Vector3(uv_scale.x, uv_scale.y, 1.0)
	mat.texture_filter = BaseMaterial3D.TEXTURE_FILTER_LINEAR_WITH_MIPMAPS_ANISOTROPIC
	mat.roughness = float(profile(role).get("roughness", 0.9))
	mat.metallic = float(profile(role).get("metallic", 0.0))
	return mat

static func brick(tint: Color = Color(1, 1, 1), uv_scale: Vector2 = Vector2(10, 5)) -> StandardMaterial3D:
	return textured(T_BRICK, tint, uv_scale, "brick", T_BRICK_NORMAL)

static func concrete(tint: Color = Color(1, 1, 1), uv_scale: Vector2 = Vector2(9, 2.4)) -> StandardMaterial3D:
	return textured(T_CONCRETE, tint, uv_scale, "concrete", T_CONCRETE_NORMAL)

static func asphalt(tint: Color = Color(1, 1, 1), uv_scale: Vector2 = Vector2(30, 7),
		wet: bool = false) -> StandardMaterial3D:
	var texture: Texture2D = T_ASPHALT_WET if wet else T_ASPHALT
	var normal: Texture2D = T_ASPHALT_WET_NORMAL if wet else T_ASPHALT_NORMAL
	var mat := textured(texture, tint, uv_scale, "asphalt", normal)
	# Damp asphalt at night picks up the street lamps and the marquee: glossier
	# and slightly metallic so the lamp pools read as reflections.
	mat.metallic_specular = 0.75 if wet else 0.6
	mat.roughness = 0.38 if wet else float(profile("asphalt").get("roughness", 0.72))
	return mat

static func awning(tint: Color = Color(1, 1, 1), uv_scale: Vector2 = Vector2(4, 1)) -> StandardMaterial3D:
	return textured(T_AWNING, tint, uv_scale, "awning")

## Flat-coloured surface with a profile (props, trim, limbs, clothing).
static func flat(color: Color, role: String = "concrete") -> StandardMaterial3D:
	var mat := StandardMaterial3D.new()
	mat.albedo_color = color
	mat.roughness = float(profile(role).get("roughness", 0.9))
	mat.metallic = float(profile(role).get("metallic", 0.0))
	return mat

## Self-lit surface (marquee bars, lamp bulbs, lock indicator).
static func emissive(color: Color, energy: float = 1.4) -> StandardMaterial3D:
	var mat := StandardMaterial3D.new()
	mat.albedo_color = color
	mat.emission_enabled = true
	mat.emission = color
	mat.emission_energy_multiplier = energy
	mat.roughness = 0.4
	return mat

## Fake light shaft for the flashlight (Compatibility has no volumetrics).
## Additive, unshaded, no depth write: it glows over the scene, is still occluded
## by walls, and fades out along its length instead of ending in a hard disc.
static func light_beam() -> StandardMaterial3D:
	var mat := StandardMaterial3D.new()
	mat.shading_mode = BaseMaterial3D.SHADING_MODE_UNSHADED
	mat.transparency = BaseMaterial3D.TRANSPARENCY_ALPHA
	mat.blend_mode = BaseMaterial3D.BLEND_MODE_ADD
	mat.cull_mode = BaseMaterial3D.CULL_DISABLED
	mat.depth_draw_mode = BaseMaterial3D.DEPTH_DRAW_DISABLED
	mat.albedo_color = Color(1.0, 0.95, 0.82, 1.0)
	var fade := Gradient.new()
	fade.set_color(0, Color(1.0, 0.95, 0.82, 0.0))
	fade.add_point(0.18, Color(1.0, 0.95, 0.82, 0.22))
	fade.set_color(fade.get_point_count() - 1, Color(1.0, 0.95, 0.82, 0.0))
	var ramp := GradientTexture1D.new()
	ramp.gradient = fade
	mat.albedo_texture = ramp
	mat.texture_filter = BaseMaterial3D.TEXTURE_FILTER_LINEAR
	return mat

## Dark glass for windows and the entrance door. The alpha keeps the interior
## visible, and the low roughness gives the facade a highlight instead of a hole.
static func glass(color: Color = Color(0.42, 0.56, 0.72, 0.75)) -> StandardMaterial3D:
	var mat := StandardMaterial3D.new()
	mat.albedo_color = color
	mat.transparency = BaseMaterial3D.TRANSPARENCY_ALPHA
	mat.roughness = float(profile("glass").get("roughness", 0.12))
	mat.metallic = 0.15
	mat.metallic_specular = 0.8
	return mat

## Window pane that can be lit from the inside at night. Solid dark glass reads
## as a window at midday; alpha glass just looked like white paper on the brick.
static func window_pane() -> StandardMaterial3D:
	var mat := StandardMaterial3D.new()
	mat.albedo_color = Color(0.09, 0.12, 0.17)
	mat.roughness = 0.18
	mat.metallic = 0.35
	mat.metallic_specular = 0.6
	mat.emission_enabled = true
	mat.emission = Color(1.0, 0.86, 0.62)
	mat.emission_energy_multiplier = 0.0
	return mat

## Environment look shared by every phase: ACES tonemapping, soft glow, aerial
## fog for depth, and a mild contrast/saturation lift. Phase values come from
## `GameManager.PHASE_LIGHTING`.
static func configure_environment(env: Environment, cfg: Dictionary) -> void:
	if env == null:
		return
	env.background_mode = Environment.BG_SKY
	env.tonemap_mode = Environment.TONE_MAPPER_ACES
	env.tonemap_exposure = float(cfg.get("exposure", 1.0))
	env.tonemap_white = 6.0
	env.ambient_light_energy = float(cfg.get("ambient_energy", 0.5))
	env.reflected_light_source = Environment.REFLECTION_SOURCE_SKY
	# Glow makes the marquee, lamp bulbs, and windows read as light sources.
	env.glow_enabled = true
	env.glow_normalized = true
	env.glow_intensity = float(cfg.get("glow", 0.55))
	env.glow_strength = 1.0
	env.glow_bloom = 0.08
	env.glow_hdr_threshold = 1.0
	env.glow_blend_mode = Environment.GLOW_BLEND_MODE_SOFTLIGHT
	# Aerial perspective: the skyline ring sits ~200 m out, so light fog gives the
	# distance its haze without hiding the street.
	env.fog_enabled = true
	env.fog_light_color = cfg.get("fog_color", Color(0.72, 0.78, 0.88))
	env.fog_light_energy = float(cfg.get("fog_energy", 0.7))
	env.fog_density = float(cfg.get("fog_density", 0.0035))
	env.fog_aerial_perspective = 0.25
	env.fog_sky_affect = 0.4
	env.adjustment_enabled = true
	env.adjustment_brightness = 1.0
	env.adjustment_contrast = float(cfg.get("contrast", 1.06))
	env.adjustment_saturation = float(cfg.get("saturation", 1.08))