CraftingSystem - Part 9

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class CraftingSystem : MonoBehaviour
{
    public GameObject craftingScreenUI;
    public GameObject toolsScreenUI;
    public List<string> inventoryItemList = new List<string> ();
    //Category Buttons
    Button toolsBTN;
    //Craft Buttons
    Button craftAxeBTN;
    //Requirement Text
    Text AxeReq1, AxeReq2;
    public bool isOpen;
    //All Blueprints
    public Blueprint AxeBLP = new Blueprint ("Axe", 2, "Stone", 2, "Stick", 1);
    public static CraftingSystem Instance { get; set; }
    private void Awake()
    {
        if (Instance !=null && Instance !=this)
        {
            Destroy(gameObject);
        }
        else
        {
            Instance = this;
        }
    }
    // Start is called before the first frame update
    void Start()
    {
        isOpen = false;
        toolsBTN = craftingScreenUI.transform.Find("ToolsButton").GetComponent<Button> ();
        toolsBTN.onClick.AddListener(delegate { OpenToolsCategory(); });
        // AXE
        AxeReq1 = toolsScreenUI.transform.Find("Axe").transform.Find("req1").GetComponent<Text>();
        AxeReq2 = toolsScreenUI.transform.Find("Axe").transform.Find("req2").GetComponent<Text>();
        craftAxeBTN = toolsScreenUI.transform.Find("Axe").transform.Find("Button").GetComponent<Button>();
        craftAxeBTN.onClick.AddListener(delegate { CraftAnyItem(AxeBLP); });
    }
    void OpenToolsCategory()
    {
        craftingScreenUI.SetActive (false);
        toolsScreenUI.SetActive (true);
    }
    void CraftAnyItem(Blueprint blueprintToCraft)
    {
        //add item into inventory
        InventorySystem.Instance.AddToInventory(blueprintToCraft.itemName);
        //remove resources from inventory
        if (blueprintToCraft.numOfRequirements == 1)
        {
            InventorySystem.Instance.RemoveItem(blueprintToCraft.Req1, blueprintToCraft.Req1amount);
        }
        else if (blueprintToCraft.numOfRequirements == 2)
        {
            InventorySystem.Instance.RemoveItem(blueprintToCraft.Req1, blueprintToCraft.Req1amount);
            InventorySystem.Instance.RemoveItem(blueprintToCraft.Req2, blueprintToCraft.Req2amount);
        }
        // refresh list
        StartCoroutine(calculate());
    }
    public IEnumerator calculate()
    {
        yield return 0;        // yield return new WaitForSeconds(1f); //To wait to do something
        InventorySystem.Instance.ReCalculateList();
        RefreshNeededItems();
    }
    // Update is called once per frame
    void Update()
    {
       if (Input.GetKeyDown(KeyCode.C) && !isOpen)
        {
            craftingScreenUI.SetActive(true);
            Cursor.lockState = CursorLockMode.None;
            isOpen = true;
        }
        else if (Input.GetKeyDown(KeyCode.C) && isOpen)
        {
            craftingScreenUI.SetActive(false);
            toolsScreenUI.SetActive(false);

            if (!InventorySystem.Instance.isOpen) {
                Cursor.lockState = CursorLockMode.Locked;
            }
            isOpen = false;
        }
    }
    public void RefreshNeededItems()
    {
        int stone_count = 0;
        int stick_count = 0;
        inventoryItemList = InventorySystem.Instance.itemList;
        foreach (string itemName in inventoryItemList)
        {
            switch (itemName)
            {
                case "Stone":
                    stone_count++;
                    break;
                case "Stick":
                    stick_count++;
                    break;
            }
        }
        // Axe
        AxeReq1.text = "2 Stone [" + stone_count + "/2]";
        AxeReq2.text = "1 Stick [" + stick_count + "/1]";

        if (stone_count >= 2 && stick_count >=1)
        {
            craftAxeBTN.gameObject.SetActive(true);
        }
        else
        {
            craftAxeBTN.gameObject.SetActive(false);
        }
    }
}