My Summer Car buyable mod item

BuyableBehaviour.cs

/*
When the mod is loaded, instantiate your GameObject, then set its position to somewhere in Teimo's shop.
The GameObject must have the usual interactivity components - a convex MeshCollider and a Rigidbody.
It's best to set Rigidbody.isKinematic to true and GameObject.tag to "Untagged" before adding the behaviour component.
*/

/*MIT License
Copyright(c) 2018 Wampa842
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.*/
using System;
using System.Linq;
using System.Collections.Generic;

using UnityEngine;
using MSCLoader;
using HutongGames.PlayMaker;

namespace BuyableItem
{
	// Required class - GameHook by zamp
	public class GameHook
	{
		/*MIT License

		Copyright(c) 2017 zamp

		Permission is hereby granted, free of charge, to any person obtaining a copy
		of this software and associated documentation files (the "Software"), to deal
		in the Software without restriction, including without limitation the rights
		to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
		copies of the Software, and to permit persons to whom the Software is
		furnished to do so, subject to the following conditions:

		The above copyright notice and this permission notice shall be included in all
		copies or substantial portions of the Software.

		THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
		IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
		FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
		AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
		LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
		OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
		SOFTWARE.*/
		private class FsmHookAction : FsmStateAction
		{
			public Action hook;
			public override void OnEnter()
			{
				hook.Invoke();
				Finish();
			}
		}

		public static void InjectStateHook(GameObject gameObject, string stateName, Action hook)
		{
			var state = GetStateFromGameObject(gameObject, stateName);
			if (state != null)
			{
				// inject our hook action to the state machine
				var actions = new List<FsmStateAction>(state.Actions);
				var hookAction = new FsmHookAction();
				hookAction.hook = hook;
				actions.Insert(0, hookAction);
				state.Actions = actions.ToArray();
			}
		}

		private static FsmState GetStateFromGameObject(GameObject obj, string stateName)
		{
			var comps = obj.GetComponents<PlayMakerFSM>();
			foreach (var playMakerFsm in comps)
			{
				var state = playMakerFsm.FsmStates.FirstOrDefault(x => x.Name == stateName);
				if (state != null)
					return state;
			}
			return null;
		}
	}

	public class BuyableBehaviour : MonoBehaviour
	{
		public static float Price => 300.0f;
		public static Vector3 CounterPos => new Vector3(-1551.03f, 4.8f, 1182.74f);
    public static string ItemName => "item";

		// While in the shop, the items should be maintained on a List so they can be properly disposed of when the shop is restocked
		// public List<GameObject> ShopList;

		private GameObject _register;
		private bool _bought = false;
		private bool _buying = false;
		private FsmBool _guiBuy;
		private FsmString _guiText;

		// Make interactive
		public void Activate()
		{
			transform.parent = null;
			gameObject.name = ItemName + "(Clone)";
			gameObject.layer = LayerMask.NameToLayer("Parts");
			gameObject.tag = "PART";
			gameObject.GetComponent<Rigidbody>().isKinematic = false;
		}

		// Public member that sets the "bought" status (e.g. for loading a save)
		public void SetBought()
		{
			_bought = true;
		}

		// Put the item in the basket
		private void _buy()
		{
			PlayMakerFSM registerFsm = _register.GetComponent<PlayMakerFSM>();
			registerFsm.FsmVariables.GetFsmFloat("PriceTotal").Value += Price;
			registerFsm.SendEvent("PURCHASE");
			_buying = true;
			gameObject.SetActive(false);
		}

		// Pay for the items in the basket
		private void _pay()
		{
			if (_buying)
			{
				// Move to counter
				gameObject.SetActive(true);
				transform.position = CounterPos;

				// Make interactive and dynamic
				Activate();
				_buying = false;
				_bought = true;

				// If the shop content is maintained on a list, now is the time to remove the item
				// ShopList.Remove(gameObject);
			}
		}

		// Find GUI FSMvars and hook into the store action
		void Awake()
		{
			_register = GameObject.Find("STORE/StoreCashRegister/Register");
			_guiBuy = PlayMakerGlobals.Instance.Variables.FindFsmBool("GUIbuy");
			_guiText = PlayMakerGlobals.Instance.Variables.FindFsmString("GUIinteraction");
			GameHook.InjectStateHook(_register, "Purchase", () => { _pay(); });
		}

		void Update()
		{
			bool activate = Input.GetKeyDown(KeyCode.Mouse0);

			Physics.Raycast(Camera.main.ScreenPointToRay(Input.mousePosition), out RaycastHit hit, 1.0f);
			if (hit.collider.gameObject == this.gameObject)
			{
				if (!_bought)
				{
					_guiBuy.Value = true;
					_guiText.Value = $"{ItemName} ({Price} mk)";
					if (activate)
					{
						_buy();
					}
				}
			}
		}
	}
}