extends SceneTree

## Dev tool: close-up of the hip/thigh region through a run cycle.
##
##   godot --path . --windowed --resolution 900x900 -s res://debug/skirt_closeup.gd -- <out_dir> [skin]
##
## debug/anim_capture.gd frames the whole character in 1280x720, which is far
## too small to judge whether a thigh is poking through a skirt — the question
## this exists to answer. Camera sits ~0.9 m from the hips at hip height and
## saves front and side views at several points across the stride.

var _frames := 0
var _out := "."
var _model: SkinnedPlayerModel = null
var _cam: Camera3D = null
var _shots := 0
const SHOT_EVERY := 7


func _initialize() -> void:
	var args := OS.get_cmdline_user_args()
	_out = args[0] if args.size() > 0 else "."
	var path := "res://assets/characters/skins/taila.glb"
	if args.size() > 1:
		path = "res://assets/characters/skins/%s.glb" % args[1]
	var scene := Node3D.new()
	root.add_child(scene)
	current_scene = scene

	var env := WorldEnvironment.new()
	var e := Environment.new()
	e.background_mode = Environment.BG_COLOR
	e.background_color = Color(0.15, 0.15, 0.2)
	e.ambient_light_source = Environment.AMBIENT_SOURCE_COLOR
	e.ambient_light_color = Color(1, 1, 1)
	e.ambient_light_energy = 1.6
	env.environment = e
	scene.add_child(env)
	var sun := DirectionalLight3D.new()
	sun.rotation_degrees = Vector3(-40, 35, 0)
	sun.light_energy = 1.4
	scene.add_child(sun)

	_model = SkinnedPlayerModel.new()
	_model.model_path = path
	scene.add_child(_model)
	_cam = Camera3D.new()
	_cam.fov = 26.0
	scene.add_child(_cam)
	_cam.current = true


func _process(_delta: float) -> bool:
	_frames += 1
	if _frames < 10 or not _model.loaded:
		return false
	_model.update_state("ground", 9.0, false)
	_model.set_locomotion(0.0, 1.0, 0.0)

	# Frame the hips: that is where a skirt meets a thigh.
	var hips := 0.95
	if _model.skeleton:
		var h := _model.skeleton.find_bone("DEF-spine")
		if h >= 0:
			hips = _model.skeleton.get_bone_global_pose(h).origin.y
	# Position on one frame, capture on the next: awaiting inside _process turns
	# it into a coroutine and the SceneTree stops driving it.
	if _frames > 20 and _shots < 8:
		var phase := _frames % SHOT_EVERY
		if phase == 0:
			var side := (_shots % 2) == 1
			if side:
				_cam.position = Vector3(0.85, hips - 0.02, 0.0)
			else:
	# NEGATIVE Z is the FRONT. SkinnedPlayerModel spins the imported scene 180
	# degrees (`facing_flip`: glTF forward is +Z, players face -Z), so a camera
	# on +Z looks at the character's BACK. Every tool in here used to sit on +Z,
	# and every "front" judgement made from them was of the back of the skirt.
				_cam.position = Vector3(0.0, hips - 0.02, -0.85)
			_cam.look_at(Vector3(0, hips - 0.16, 0), Vector3.UP)
		elif phase == 1:
			var tag := "side" if (_shots % 2) == 1 else "front"
			root.get_texture().get_image().save_png(
				"%s/skirt_%s_%d.png" % [_out, tag, _shots])
			print("saved skirt_%s_%d.png" % [tag, _shots])
			_shots += 1
	if _shots >= 8:
		return true
	if _frames > 200:
		return true
	return false