extends Node3D
## Garment preview capture (T-1089 G3/G4 visual QA).
##
## Renders the fitted t-shirt worn on a body with the NEW toon_garment.gdshader:
## RGBA-mask 4-region tints + a logo decal on the UV2 chest channel. This proves
## the shader + region mask + logo pipeline end-to-end WITHOUT editing
## character_visual.gd (which a parallel agent owns) — the garment meshes are
## attached to the CharacterVisual skeleton and the shader is applied here as a
## material_override, exactly the surface the lead's _apply_clothing_shader patch
## will drive at runtime.
##
## Config via env vars (all optional):
##   GARMENT_PREVIEW_ITEM   default "tshirt_modern"
##   GARMENT_PREVIEW_BODY   default "average_m"
##   GARMENT_PREVIEW_OUT    default "<repo>/.cache/garment-preview"
##
## Run: godot4 --path client --rendering-driver opengl3 \
##        res://tools/garment_preview/preview_scene.tscn

const CLOTHING_DIR := "res://assets/characters/clothing/"
const LOGO_PATH := "res://assets/characters/logos/thrds.png"
const SHADER_PATH := "res://assets/characters/shaders/toon_garment.gdshader"
const VIEWPORT := Vector2i(768, 1024)

const BODY_KEY_TO_ENUM := {
	"average_m": CharacterVisualDescriptor.BodyType.AVERAGE_M,
	"average_f": CharacterVisualDescriptor.BodyType.AVERAGE_F,
	"muscular_m": CharacterVisualDescriptor.BodyType.MUSCULAR_M,
	"muscular_f": CharacterVisualDescriptor.BodyType.MUSCULAR_F,
	"teen_m": CharacterVisualDescriptor.BodyType.TEEN_M,
	"teen_f": CharacterVisualDescriptor.BodyType.TEEN_F,
}

# Modern casual palette: light collar, teal body, charcoal sleeves.
const TINT_COLLAR := Color(0.92, 0.93, 0.95)   # R region
const TINT_BODY := Color(0.15, 0.42, 0.48)     # G region
const TINT_SLEEVE := Color(0.20, 0.22, 0.26)   # B region

var _out_dir := ""
var _cam: Camera3D = null


func _ready() -> void:
	var item := _env("GARMENT_PREVIEW_ITEM", "tshirt_modern")
	var body := _env("GARMENT_PREVIEW_BODY", "average_m")
	_out_dir = _env("GARMENT_PREVIEW_OUT",
		"/var/mnt/data/projects/settled-reach/.cache/garment-preview")
	get_window().size = VIEWPORT
	_setup_stage()
	_run.call_deferred(item, body)


func _env(key: String, fallback: String) -> String:
	var v := OS.get_environment(key)
	return v if not v.is_empty() else fallback


func _setup_stage() -> void:
	var light := DirectionalLight3D.new()
	light.rotation_degrees = Vector3(-38, 28, 0)
	light.light_energy = 1.3
	add_child(light)
	var env := Environment.new()
	env.ambient_light_source = Environment.AMBIENT_SOURCE_COLOR
	env.ambient_light_color = Color(0.82, 0.82, 0.86)
	env.ambient_light_energy = 0.9
	env.background_mode = Environment.BG_COLOR
	env.background_color = Color(0.16, 0.17, 0.20)
	var we := WorldEnvironment.new()
	we.environment = env
	add_child(we)
	_cam = Camera3D.new()
	_cam.fov = 45.0
	add_child(_cam)
	# Frame the upper body so the chest logo + region tints read clearly.
	_cam.position = Vector3(0.0, 1.25, 1.7)
	_cam.look_at_from_position(_cam.position, Vector3(0.0, 1.15, 0.0), Vector3.UP)


func _run(item: String, body: String) -> void:
	DirAccess.make_dir_recursive_absolute(_out_dir)
	if not BODY_KEY_TO_ENUM.has(body):
		push_error("preview: unknown body %s" % body)
		get_tree().quit(1)
		return

	var cv := CharacterVisual.new()
	add_child(cv)
	var desc := CharacterVisualDescriptor.new()
	desc.body_type = BODY_KEY_TO_ENUM[body]
	desc.head_id = "head_001"
	desc.hair_id = "buzzed"
	desc.eyebrow_id = "regular"
	desc.skin_tone = 3
	cv.load_descriptor(desc)

	var skel := cv.get_skeleton()
	if skel == null:
		push_error("preview: no skeleton")
		get_tree().quit(1)
		return

	var meshes := _attach_garment(skel, item, body)
	print("preview: attached %d garment meshes" % meshes.size())
	var shader := load(SHADER_PATH) as Shader
	var mask := _try_load(CLOTHING_DIR + "%s/reference_mask.png" % item)
	var logo_path := _env("GARMENT_PREVIEW_LOGO", LOGO_PATH)
	var logo := _try_load(logo_path)
	for mi in meshes:
		_apply_garment_shader(mi, shader, mask, logo)

	# Freeze on a clean rest-ish pose (idle) so the shirt reads without motion blur.
	var ap := cv.get_animation_player()
	if ap != null:
		var walk := _resolve_clip(ap, "Walk")
		if not walk.is_empty():
			cv.play_animation(walk)
			ap.pause()
			ap.seek(ap.current_animation_length * 0.25, true)
			await get_tree().process_frame

	# Front + 3/4 + side + back so we can see the logo wherever the chest lands.
	for yaw in [0, 45, 180, 315]:
		cv.rotation_degrees.y = float(yaw)
		await RenderingServer.frame_post_draw
		await RenderingServer.frame_post_draw
		var fname := "%s__%s__yaw%03d.png" % [item, body, yaw]
		get_viewport().get_texture().get_image().save_png(_out_dir.path_join(fname))
		print("preview: wrote ", fname)

	print("preview: DONE")
	get_tree().quit(0)


func _attach_garment(skel: Skeleton3D, item: String, body: String) -> Array:
	var out: Array = []
	var glb := CLOTHING_DIR + "%s/%s.glb" % [item, body]
	if not ResourceLoader.exists(glb):
		push_error("preview: garment GLB missing %s" % glb)
		return out
	var inst := (load(glb) as PackedScene).instantiate()
	var stack: Array[Node] = [inst]
	while not stack.is_empty():
		var n: Node = stack.pop_back()
		for c in n.get_children():
			stack.append(c)
		if n is MeshInstance3D and (n as MeshInstance3D).skin != null:
			var mi := n as MeshInstance3D
			mi.get_parent().remove_child(mi)
			mi.owner = null
			skel.add_child(mi)
			out.append(mi)
	inst.queue_free()
	return out


func _apply_garment_shader(mi: MeshInstance3D, shader: Shader, mask: Texture2D, logo: Texture2D) -> void:
	if mi.mesh == null or shader == null:
		return
	var albedo := _albedo_of(mi)
	var mat := ShaderMaterial.new()
	mat.shader = shader
	if albedo:
		mat.set_shader_parameter("albedo_tex", albedo)
	if mask:
		mat.set_shader_parameter("region_mask", mask)
	if logo:
		mat.set_shader_parameter("logo_tex", logo)
		mat.set_shader_parameter("logo_enabled", 1.0)
	mat.set_shader_parameter("tint_0", TINT_COLLAR)
	mat.set_shader_parameter("tint_1", TINT_BODY)
	mat.set_shader_parameter("tint_2", TINT_SLEEVE)
	mat.set_shader_parameter("tint_3", Color.WHITE)
	mat.set_shader_parameter("shadow_strength", 0.2)
	mi.material_override = mat


func _albedo_of(mi: MeshInstance3D) -> Texture2D:
	for surf in range(mi.mesh.get_surface_count()):
		var m := mi.mesh.surface_get_material(surf)
		if m is BaseMaterial3D:
			return (m as BaseMaterial3D).albedo_texture
	return null


func _try_load(path: String) -> Texture2D:
	return load(path) as Texture2D if ResourceLoader.exists(path) else null


func _resolve_clip(ap: AnimationPlayer, requested: String) -> String:
	for lib_name in ap.get_animation_library_list():
		var lib := ap.get_animation_library(lib_name)
		for a in lib.get_animation_list():
			if str(a).to_lower().contains(requested.to_lower()):
				return str(a)
	return ""