extends Node3D
## mtgodot-poc harness — M1 (static render) + M2 (skeletal animation).
##
## Loads a Metin2 .gr2 via the Metin2Model GDExtension node, renders it with
## Godot's Forward+ renderer, and (if an anim .gr2 is given) drives it with
## Metin2AnimPlayer.
##
## Asset paths default to the sibling m2dev-client-main checkout; override with
## MTGODOT_MODEL / MTGODOT_ANIM / MTGODOT_TEXDIR env vars.
##
## Keys:  drag = orbit   wheel = zoom   Space = play/pause   B = bind pose
##        [ / ] = scrub   R = reload    F2 = screenshot

const ORBIT_SPEED := 0.01
const ZOOM_STEP := 0.15
const PITCH_LIMIT := 1.45

var _assets_root := ""
var _cam: Camera3D
var _model: Node3D          # Metin2Model
var _anim: Node3D           # Metin2AnimPlayer
var _yaw := 0.7
var _pitch := 0.25
var _dist := 3.0
var _target := Vector3(0.0, 1.0, 0.0)
var _dragging := false


func _ready() -> void:
	_assets_root = ProjectSettings.globalize_path("res://../../m2dev-client-main/assets")
	_build_environment()
	_build_sun()
	_build_camera()
	_load_content()
	_frame_model()
	print("[mtgodot] harness ready")

	var autoshot := OS.get_environment("MTGODOT_AUTOSHOT")
	if autoshot != "":
		# let a few frames render (and the anim settle) before capturing
		for i in 8:
			await get_tree().process_frame
		var img := get_viewport().get_texture().get_image()
		img.save_png(autoshot)
		print("[mtgodot] autoshot -> ", autoshot)
		get_tree().quit()


func _build_environment() -> void:
	var we := WorldEnvironment.new()
	var env := Environment.new()
	var sky := Sky.new()
	sky.sky_material = ProceduralSkyMaterial.new()
	env.background_mode = Environment.BG_SKY
	env.sky = sky
	env.ambient_light_source = Environment.AMBIENT_SOURCE_SKY
	env.ambient_light_energy = 0.6
	env.tonemap_mode = Environment.TONE_MAPPER_FILMIC
	we.environment = env
	add_child(we)


func _build_sun() -> void:
	var sun := DirectionalLight3D.new()
	sun.rotation_degrees = Vector3(-50.0, -40.0, 0.0)
	sun.shadow_enabled = true
	sun.light_energy = 1.1
	add_child(sun)


func _build_camera() -> void:
	_cam = Camera3D.new()
	_cam.current = true
	_cam.fov = 45.0
	_cam.near = 0.01
	add_child(_cam)
	_update_camera()


func _env(name: String, fallback: String) -> String:
	var v := OS.get_environment(name)
	return v if v != "" else fallback


func _load_content() -> void:
	if not ClassDB.class_exists("Metin2Model"):
		push_error("[mtgodot] Metin2Model not registered — GDExtension failed to load")
		return

	var model_path := _env("MTGODOT_MODEL",
		_assets_root.path_join("PC/ymir work/pc/warrior/warrior_cheongrin.gr2"))
	var tex_dir := _env("MTGODOT_TEXDIR",
		_assets_root.path_join("PC/ymir work/pc/warrior"))
	var anim_path := _env("MTGODOT_ANIM",
		_assets_root.path_join("PC/ymir work/pc/warrior/action/dance_1.gr2"))

	_model = ClassDB.instantiate("Metin2Model")
	_model.name = "Metin2Model"
	_model.set("texture_dir", tex_dir)
	_model.set("gr2_path", model_path)
	add_child(_model)
	if _model.has_method("get_info"):
		print("[mtgodot] model: ", _model.call("get_info"))

	if anim_path != "-" and FileAccess.file_exists(anim_path) and ClassDB.class_exists("Metin2AnimPlayer"):
		_anim = ClassDB.instantiate("Metin2AnimPlayer")
		_anim.name = "Metin2AnimPlayer"
		_anim.set("model_path", _anim.get_path_to(_model) if false else NodePath("../Metin2Model"))
		_anim.set("anim_path", anim_path)
		add_child(_anim)
		if _anim.has_method("get_info"):
			print("[mtgodot] anim: ", _anim.call("get_info"))
		if _anim.has_method("selfcheck"):
			print("[mtgodot] ", _anim.call("selfcheck", 24))
		_anim.call("reload")
		var fixed_t := OS.get_environment("MTGODOT_ANIM_T")
		if fixed_t != "":
			_anim.set("playing", false)
			_anim.call("set_time", float(fixed_t))
			print("[mtgodot] fixed t=", _anim.call("get_time"), " dur=", _anim.call("get_duration"))


func _frame_model() -> void:
	# Use the model's converted world-space AABB to place the orbit target/dist.
	var mi := _model.get_node_or_null("MeshInstance3D") if _model else null
	if mi and mi is VisualInstance3D:
		var aabb: AABB = (mi as VisualInstance3D).get_aabb()
		aabb = _model.transform * aabb
		_target = aabb.get_center()
		_dist = maxf(1.0, aabb.get_longest_axis_size() * 1.8)
	_update_camera()


func _update_camera() -> void:
	var offset := Vector3(
		cos(_pitch) * sin(_yaw),
		sin(_pitch),
		cos(_pitch) * cos(_yaw)) * _dist
	_cam.position = _target + offset
	_cam.look_at(_target, Vector3.UP)


func _unhandled_input(event: InputEvent) -> void:
	if event is InputEventMouseButton:
		var mb := event as InputEventMouseButton
		match mb.button_index:
			MOUSE_BUTTON_LEFT:
				_dragging = mb.pressed
			MOUSE_BUTTON_WHEEL_UP:
				_dist = maxf(0.2, _dist * (1.0 - ZOOM_STEP))
				_update_camera()
			MOUSE_BUTTON_WHEEL_DOWN:
				_dist = minf(200.0, _dist * (1.0 + ZOOM_STEP))
				_update_camera()
	elif event is InputEventMouseMotion and _dragging:
		var mm := event as InputEventMouseMotion
		_yaw -= mm.relative.x * ORBIT_SPEED
		_pitch = clampf(_pitch + mm.relative.y * ORBIT_SPEED, -PITCH_LIMIT, PITCH_LIMIT)
		_update_camera()
	elif event is InputEventKey and event.pressed and not event.echo:
		_on_key(event.keycode)


func _on_key(kc: int) -> void:
	match kc:
		KEY_F2:
			_screenshot()
		KEY_SPACE:
			if _anim:
				_anim.set("playing", not _anim.get("playing"))
		KEY_B:
			if _anim:
				_anim.set("playing", false)
				_anim.call("set_time", 0.0)
		KEY_R:
			if _model:
				_model.call("reload")
			if _anim:
				_anim.call("reload")
			_frame_model()
		KEY_BRACKETLEFT:
			if _anim:
				_anim.call("set_time", _anim.call("get_time") - 0.05)
		KEY_BRACKETRIGHT:
			if _anim:
				_anim.call("set_time", _anim.call("get_time") + 0.05)


func _screenshot() -> void:
	var img := get_viewport().get_texture().get_image()
	var path := "user://shot_%d.png" % Time.get_ticks_msec()
	img.save_png(path)
	print("[mtgodot] screenshot -> ", ProjectSettings.globalize_path(path))