station_obscurum_unity/Assets/Scripts/Player/PlayerInteractionHandler.cs

using System.Collections.Generic;
using UnityEngine;

namespace Player
{

[RequireComponent(typeof(Collider))]
public class PlayerInteractionHandler : MonoBehaviour
{
    public static PlayerInteractionHandler instance;

    [SerializeField] private Light flashlight;

    [SerializeField] private GameObject flashlight3D;

    [SerializeField] private int materialIndex = 1;

    [SerializeField] private Transform carryingPos;

    [SerializeField] private bool useItemSelector = true;

    [SerializeField] private Item.PistolComponent pistol;

    [SerializeField] private NoiseVisibilitySettingsManager noiseManager;

    [SerializeField] private CameraShift shift;

    public bool isDead;

    //Check if button down
    private readonly AxisIsDown fireDown = new("Fire1");
    private bool flashlightEnabled = true;

    private Item.HeavyInteractableItem heavyInvent;
    private readonly List<Item.HeavyInteractableItem> heavyItemsInRange = new();
    private Color initColor;
    private Item.Inventory invent;

    private Item.ItemSelector itemSelector;
    private readonly List<Item.InteractableItem> itemsInRange = new();
    [SerializeField]
    private Scriptable.GameState manager;
    private Material selMaterial;
    private Item.TempInventory tempInvent;
    public Item.Inventory Inventory => invent;
    public bool IsCarrying => heavyInvent != null;
    public bool GunEnabled { get; private set; }

    public Transform CarryingPos => carryingPos;

    // Start is called before the first frame update
    private void Start()
    {
        instance = this;
        invent = transform.parent.GetComponent<Item.Inventory>();
        //TEMP FIELD
        tempInvent = transform.parent.GetComponent<Item.TempInventory>();

        initColor = flashlight3D.GetComponent<MeshRenderer>().materials[materialIndex].GetColor("_BaseColor");
        selMaterial = flashlight3D.GetComponent<MeshRenderer>().materials[materialIndex];
        itemSelector = Item.ItemSelector.instance;
        pistol.gameObject.SetActive(GunEnabled);
        flashlightEnabled = flashlight.gameObject.activeSelf;
        
    }

    // Update is called once per frame
    private void Update()
    {
        fireDown.Check();
        if (isDead)
        {
            DropHeavy();
            return;
        }

        if (manager.IsPaused || isDead) return;

        if (Input.GetButtonDown("Fire1") || fireDown.IsDown())
        {
            if (GunEnabled)
            {
                if (tempInvent.GetQuantityOf(pistol.projectileName) > 0)
                {
                    pistol.Fire();
                    noiseManager.ShotFired();
                    tempInvent.Remove(pistol.projectileName);
                }
            }
            else
            {
                if (!IsCarrying)
                {
                    var t_index = 0;
                    var pickupFound = false;
                    if (itemsInRange.Count > 0)
                    {
                        while (t_index < itemsInRange.Count && !itemsInRange[t_index].CanPickup) t_index++;
                        if (t_index != itemsInRange.Count)
                        {
                            pickupFound = true;
                            invent.AddItem(itemsInRange[t_index]);
                            itemsInRange[0].transform.gameObject.SetActive(false);
                            itemsInRange.Remove(itemsInRange[t_index]);
                        }
                    }
                    else if (heavyItemsInRange.Count > 0)
                    {
                        pickupFound = true;


                        heavyInvent = heavyItemsInRange[0];

                        heavyInvent.transform.parent = carryingPos;
                        heavyInvent.transform.localPosition = Vector3.zero;
                        heavyInvent.GetComponent<Rigidbody>().isKinematic = true;
                        heavyItemsInRange.Remove(heavyItemsInRange[0]);
                        heavyInvent.Disable();
                        heavyInvent.DisableAll();
                    }

                    if (!pickupFound)
                        foreach (var item in itemsInRange)
                            if (!item.CanPickup)
                            {
                                if (!item.Interact(ref invent, ref heavyInvent))
                                    item.Interact();
                                else if (item is Item.HeavyItemReceiver)
                                    if (heavyInvent != null)
                                    {
                                        heavyInvent.transform.parent = carryingPos;
                                        heavyInvent.transform.localPosition = Vector3.zero;
                                        heavyInvent.transform.localEulerAngles = Vector3.zero;
                                        heavyItemsInRange.Remove(heavyInvent);
                                        heavyInvent.GetComponent<Rigidbody>().constraints =
                                            RigidbodyConstraints.FreezeRotation;
                                        heavyInvent.GetComponent<Rigidbody>().isKinematic = true;
                                        heavyInvent.Disable();
                                        heavyInvent.DisableAll();
                                    }
                            }
                }
                else
                {
                    int refIndex;
                    if (itemsInRange.Count > 0 && receiverInRange(out refIndex))
                    {
                        ((Item.HeavyItemReceiver)itemsInRange[refIndex]).Interact(ref invent, ref heavyInvent);
                        heavyInvent = null;
                    }
                    else
                    {
                        DropHeavy();
                    }
                }
            }
        }

        if (Input.GetButtonDown("Fire2"))
        {
            //print(this.GunEnabled);
            if (!GunEnabled)
            {
                if (!flashlight.gameObject.activeSelf)
                    EnableFlashlight();
                else
                    DisableFlashlight();
            }
            else
            {
                pistol.LightToggle();
            }
        }

        if (Input.GetButtonDown("Fire3"))
            if (!IsCarrying)
            {
                GunEnabled = !GunEnabled;
                if (!GunEnabled)
                    pistol.Disable();
                pistol.gameObject.SetActive(GunEnabled);
                if (GunEnabled)
                    pistol.Enable();
            }

        if (GunEnabled)
        {
            DisableFlashlight();

            var aimAxis = Input.GetAxis("Aim");

            if (aimAxis > 0.5f)
                pistol.aimMode = Item.PistolComponent.AimMode.CAMERA;
            else
                pistol.aimMode = Item.PistolComponent.AimMode.MODIFIED;
        }

        shift.SetCenter(!GunEnabled);
    }


    private void OnTriggerEnter(Collider other)
    {
        if (other.gameObject.GetComponent<Item.InteractableItem>() != null)
        {
            var item = other.gameObject.GetComponent<Item.InteractableItem>();
            if (item is Item.InteractableItem && item is not Item.HeavyInteractableItem)
            {
                item.Enable();
                itemsInRange.Add(item);
            }
            else if (item is Item.HeavyInteractableItem)
            {
                ((Item.HeavyInteractableItem)item).Enable();
                heavyItemsInRange.Add((Item.HeavyInteractableItem)item);
            }
        }
    }

    private void OnTriggerExit(Collider other)
    {
        if (other.gameObject.GetComponent<Item.InteractableItem>() != null)
        {
            var item = other.gameObject.GetComponent<Item.InteractableItem>();
            if (item is Item.InteractableItem && item is not Item.HeavyInteractableItem)
            {
                item.Disable();
                itemsInRange.Remove(item);
            }
            else if (item is Item.HeavyInteractableItem)
            {
                ((Item.HeavyInteractableItem)item).Disable();
                //itemsInRange.Remove((HeavyInteractableItem)(item));
                heavyItemsInRange.Remove((Item.HeavyInteractableItem)item);
            }
        }
    }

    private bool receiverInRange(out int index)
    {
        var i = 0;
        foreach (var item in itemsInRange)
        {
            if (item is Item.HeavyItemReceiver)
            {
                index = i;
                return true;
            }

            i++;
        }

        index = -1;
        return false;
    }

    private void DropHeavy()
    {
        if (heavyInvent != null)
        {
            heavyInvent.transform.parent = null;
            heavyInvent.GetComponent<Rigidbody>().isKinematic = false;
            heavyInvent.EnableAll();
            heavyInvent = null;
        }
    }

    public void EnableFlashlight()
    {
        flashlight.gameObject.SetActive(true);
        flashlight3D.GetComponent<MeshRenderer>().materials[materialIndex].SetColor("_BaseColor", initColor);
        selMaterial.SetColor("_EmissionColor", new Color(255, 255, 255, 255));
        flashlight3D.gameObject.SetActive(true);
        flashlightEnabled = true;
    }

    public void DisableFlashlight()
    {
        flashlight.gameObject.SetActive(false);
        flashlight3D.GetComponent<MeshRenderer>().materials[materialIndex].SetColor("_BaseColor", new Color(0, 0, 0));
        selMaterial.SetColor("_EmissionColor", new Color(0, 0, 0, 0));
        flashlight3D.gameObject.SetActive(false);
        flashlightEnabled = false;
    }
}


internal class AxisIsDown
{
    private float axis;


    private readonly string axisName;

    private bool down;
    private bool isDown;
    private bool pIsDown;

    public AxisIsDown(string axisName)
    {
        this.axisName = axisName;
    }

    public void Check()
    {
        axis = Input.GetAxis(axisName);
        isDown = axis > 0.5f;
        if (isDown != pIsDown && isDown)
            down = true;
        else
            down = false;
        pIsDown = isDown;
    }

    public bool IsDown()
    {
        return down;
    }
}

}