extends SceneTree

## Headless smoke test for the player spawn + skin + animation pipeline.
## Boots the test level as a singleplayer match, spawns the local player,
## ticks frames, and verifies the visual model came up for both the
## procedural skin and a GLB skin.
##
## Run: godot --headless --path . -s res://debug/spawn_smoke_test.gd

var _failures: Array = []


func _init() -> void:
	call_deferred("_run")


func _run() -> void:
	await process_frame
	await process_frame

	var skin_mgr = root.get_node_or_null("/root/SkinManager")
	_check(skin_mgr != null, "SkinManager autoload exists")
	var audio_mgr = root.get_node_or_null("/root/AudioManager")
	_check(audio_mgr != null, "AudioManager autoload exists")
	if audio_mgr:
		_check(audio_mgr.has_sound("ak47_fire"), "AudioManager auto-registered ak47_fire")

	# Pick the GLB skin if its model file is present, else default.
	var glb_skin_id := ""
	if skin_mgr:
		for id in skin_mgr.get_skin_ids():
			var s = skin_mgr.get_skin(id)
			if s.model_path != "" and ResourceLoader.exists(s.model_path):
				glb_skin_id = id
				break

	await _test_spawn_with_skin("default", false)
	if glb_skin_id != "":
		await _test_spawn_with_skin(glb_skin_id, true)
	else:
		print("NOTE: no GLB skin available, skipped skinned model test")

	print("\n=== SPAWN SMOKE SUMMARY ===")
	print("Failures: %d" % _failures.size())
	for f in _failures:
		print("FAIL: ", f)
	quit(0 if _failures.is_empty() else 1)


func _test_spawn_with_skin(skin_id: String, expect_skinned: bool) -> void:
	print("\n--- Spawn test with skin '%s' ---" % skin_id)
	var skin_mgr = root.get_node_or_null("/root/SkinManager")
	if skin_mgr:
		skin_mgr.set_active_skin(skin_id)

	var nm = root.get_node_or_null("/root/NetworkManager")
	if not _check(nm != null, "NetworkManager autoload exists"):
		return
	nm.start_singleplayer_match("Deathmatch")
	change_scene_to_file("res://scenes/maps/test_level/test_level.tscn")

	# Let the level build and the player spawn + settle.
	for i in 30:
		await process_frame

	var level = current_scene
	if not _check(level != null, "level scene loaded"):
		return
	var player = _find_player(level)
	if not _check(player != null, "player '1' spawned"):
		return

	_check(player.get_node_or_null("MovementStateMachine") != null, "state machine present")
	var visual = player.get_visual_model() if player.has_method("get_visual_model") else null
	_check(visual != null, "visual model present")

	if expect_skinned:
		var skinned = player.get_node_or_null("SkinnedModel")
		if _check(skinned != null, "SkinnedModel created for GLB skin"):
			_check(skinned.loaded, "GLB model loaded")
			_check(skinned.skeleton != null, "skeleton found in GLB")
			# The mesh must be bound to the skeleton, else it renders its bind
			# pose (T-pose) while the skeleton animates invisibly.
			var bound := false
			if skinned.skeleton:
				for mi in skinned.find_children("*", "MeshInstance3D", true, false):
					if mi.skin != null and mi.get_node_or_null(mi.skeleton) == skinned.skeleton:
						bound = true
			_check(bound, "skinned mesh is bound to the skeleton (won't T-pose)")
			if skinned.animation_player:
				# The AnimationTree drives playback now; the raw player is idle.
				_check(skinned._anim_tree != null and skinned._anim_tree.active,
					"animation tree active")
				print("  clips resolved: ", skinned._resolved_clips)
			# Drive some movement states through the same API the game uses.
			for state in ["ground", "air", "slide", "wall_run", "dash"]:
				skinned.update_state(state, 9.0, false)
				await process_frame
			_check(true, "state cycling did not crash")

	# Third-person toggle: camera swap + owner model visibility.
	if player.has_method("set_third_person"):
		var tp_cam = player.get_node_or_null(
			"HeadPivot/OrbitPivot/ShoulderOffset/ThirdPersonBoom/ThirdPersonCamera")
		_check(tp_cam != null, "third-person camera boom created")
		player.set_third_person(true)
		await process_frame
		_check(player.third_person, "toggled into third person")
		if tp_cam:
			_check(tp_cam.current, "third-person camera is current when toggled on")
		player.set_third_person(false)
		await process_frame
		_check(not player.third_person, "toggled back to first person")
	else:
		var humanoid = player.get_node_or_null("HumanoidModel")
		_check(humanoid != null and humanoid.visible, "procedural model visible for color skin")

	# Simulate a few physics frames of idle play.
	for i in 30:
		await physics_frame
	_check(is_instance_valid(player), "player survived 30 physics frames")


func _find_player(node: Node) -> Node:
	if node is CharacterBody3D and node.name == "1" and node.has_method("get_visual_model"):
		return node
	for child in node.get_children():
		var found := _find_player(child)
		if found:
			return found
	return null


func _check(ok: bool, msg: String) -> bool:
	if ok:
		print("  OK: ", msg)
	else:
		print("  FAIL: ", msg)
		_failures.append(msg)
	return ok