Stair_Horror/Assets/Scripts/PlayerController.cs

using UnityEngine;
using UnityEngine.InputSystem; 

public class PlayerController : MonoBehaviour
{
    [Header("Movement")]
    public float moveSpeed = 5f;
    public float mouseSensitivity = 15f; 

    [Header("Interaction")]
    public float interactionDistance = 3f;
    public LayerMask interactionLayer;

    private CharacterController controller;
    private Transform cameraTransform;
    private float verticalRotation = 0f;
    
    // Reference to the generated C# class
    private InputSystem_Actions inputActions;
    private Vector2 moveInput;
    private Vector2 lookInput;

    void Awake()
    {
        inputActions = new InputSystem_Actions();
        controller = GetComponent<CharacterController>();
        cameraTransform = Camera.main.transform;
        
        // Lock cursor so it doesn't leave the window
        Cursor.lockState = CursorLockMode.Locked;
        Cursor.visible = false;

        // --- INPUT BINDINGS ---

        // 1. Movement (WASD)
        inputActions.Player.Move.performed += ctx => moveInput = ctx.ReadValue<Vector2>();
        inputActions.Player.Move.canceled += ctx => moveInput = Vector2.zero;

        // 2. Looking (Mouse)
        inputActions.Player.Look.performed += ctx => lookInput = ctx.ReadValue<Vector2>();
        inputActions.Player.Look.canceled += ctx => lookInput = Vector2.zero;

        // 3. Interaction (The "E" Key)
        // This listens strictly for the button press. 
        // It does NOT trigger on collision.
        inputActions.Player.Interact.performed += ctx => TryInteract();
    }

    void OnEnable() => inputActions.Enable();
    void OnDisable() => inputActions.Disable();

    void Update()
    {
        HandleMovement();
        HandleLook();
        UpdateInteractionUI(); // Only updates the text, does not flip switches
    }

    void HandleMovement()
    {
        Vector3 move = transform.right * moveInput.x + transform.forward * moveInput.y;
        controller.Move(move * moveSpeed * Time.deltaTime);
    }

    void HandleLook()
    {
        float mouseX = lookInput.x * mouseSensitivity * Time.deltaTime;
        float mouseY = lookInput.y * mouseSensitivity * Time.deltaTime;

        verticalRotation -= mouseY;
        verticalRotation = Mathf.Clamp(verticalRotation, -90f, 90f);

        cameraTransform.localRotation = Quaternion.Euler(verticalRotation, 0f, 0f);
        transform.Rotate(Vector3.up * mouseX);
    }

    // --- INTERACTION LOGIC ---

    // This checks what we are looking at to update the screen text (e.g. "Turn On")
    void UpdateInteractionUI()
    {
        Ray ray = new Ray(cameraTransform.position, cameraTransform.forward);
        RaycastHit hit;

        if (Physics.Raycast(ray, out hit, interactionDistance, interactionLayer))
        {
            IInteractable interactable = hit.collider.GetComponent<IInteractable>();
            if (interactable != null && InteractionUI.Instance != null)
            {
                InteractionUI.Instance.UpdatePrompt(interactable.GetDescription());
            }
            else if (InteractionUI.Instance != null)
            {
                InteractionUI.Instance.ClearPrompt();
            }
        }
        else
        {
            if (InteractionUI.Instance != null) InteractionUI.Instance.ClearPrompt();
        }
    }

    // This is ONLY called when 'E' is pressed.
    void TryInteract()
    {
        Ray ray = new Ray(cameraTransform.position, cameraTransform.forward);
        RaycastHit hit;

        // Fire a raycast forward
        if (Physics.Raycast(ray, out hit, interactionDistance, interactionLayer))
        {
            // Did we hit something with the IInteractable script?
            IInteractable interactable = hit.collider.GetComponent<IInteractable>();
            
            if (interactable != null)
            {
                // If yes, execute the code (Flip the switch)
                interactable.Interact();
                
                // Immediately update the UI text so it switches from "Turn Off" to "Turn On" instantly
                if (InteractionUI.Instance != null) 
                    InteractionUI.Instance.UpdatePrompt(interactable.GetDescription());
            }
        }
    }
}