using System;
using UnityEngine;

public class Player : MonoBehaviour, IKitchenObjectParent
{
    public static Player Instance { get; private set; }
    public Transform KitchenObjectHoldPoint { get; set; }

    private const float playerRadius = .7f;
    private const float playerHeight = 2f;

    public event EventHandler OnPickedSomething;

    [SerializeField] private GameInput gameInput;
    [SerializeField] private float moveSpeed = 7f;
    [SerializeField] private float rotateSpeed = 10f;
    [SerializeField] private float interactDistance = 2f;

    [SerializeField] private LayerMask countersLayerMask;

    private Vector2 inputVector;

    private bool isWalking;
    private KitchenObject kitchenObject;
    public KitchenObject KitchenObject
    {
        get => kitchenObject;
        set
        {
            kitchenObject = value;
            if (value != null)
            {
                OnPickedSomething?.Invoke(this, EventArgs.Empty);
            }
        }
    }

    private Vector3 lastInteractDir;
    private Vector3 moveDir;
    private BaseCounter selectedCounter;

    private void Awake()
    {
        if (Instance != null)
        {
            Debug.LogError("There is more than one Player instance!");
        }

        Instance = this;
        KitchenObjectHoldPoint = transform.Find("KitchenObjectHoldPoint");
    }

    private void Start()
    {
        gameInput.OnInteractAction += GameInput_OnInteractAction;
        gameInput.OnInteractAlternateAction += GameInput_OnInteractAlternateAction;
    }

    private void Update()
    {
        HandleMovement();
        HandleInteractions();
    }

    public event EventHandler<SelectedCounterChangedEventArgs> OnSelectedCounterChanged;

    private void GameInput_OnInteractAlternateAction(object sender, System.EventArgs e)
    {
        if (!KitchenGameManager.Instance.IsGamePlaying())
        {
            return;
        }

        selectedCounter?.InteractAlternate(this);
    }

    private void GameInput_OnInteractAction(object sender, System.EventArgs e)
    {
        if (!KitchenGameManager.Instance.IsGamePlaying())
        {
            return;
        }

        selectedCounter?.Interact(this);
    }

    private void HandleInteractions()
    {
        if (moveDir != Vector3.zero)
        {
            lastInteractDir = moveDir;
        }

        if (Physics.Raycast(transform.position, lastInteractDir, out RaycastHit raycastHit, interactDistance, countersLayerMask))
        {
            if (raycastHit.transform.TryGetComponent(out BaseCounter baseCounter))
            {
                // Debug.Log("Player stands in front of a BaseCounter");
                if (baseCounter != selectedCounter)
                {
                    SetSelectedCounter(baseCounter);
                }
            }
            else
            {
                SetSelectedCounter(null);
            }
        }
        else
        {
            SetSelectedCounter(null);
        }
    }

    private void SetSelectedCounter(BaseCounter sC)
    {
        selectedCounter = sC;
        // Debug.Log(selectedCounter != null ? "SelectedCounter changed to BaseCounter" : "SelectedCounter changed to null");
        OnSelectedCounterChanged?.Invoke(this, new() { SelectedCounter = sC });
    }

    public bool IsWalking()
    {
        return isWalking;
    }

    private void HandleMovement()
    {
        inputVector = GameInput.GetMovementVectorNormalized();
        moveDir = new(inputVector.x, 0, inputVector.y);
        float moveDistance = moveSpeed * Time.deltaTime;

        bool canMove = !Physics.CapsuleCast(transform.position, transform.position + (Vector3.up * playerHeight), playerRadius, moveDir, moveDistance);
        if (!canMove)
        {
            // Cannot move towars moveDir
            //Attempt only x movement

            Vector3 moveDirX = new Vector3(moveDir.x, 0, 0).normalized;
            canMove = (moveDir.x < -.5f || moveDir.x > +.5f) && !Physics.CapsuleCast(transform.position, transform.position + (Vector3.up * playerHeight), playerRadius, moveDir, moveDistance);
            if (canMove)
            {
                //Can move only on the X
                MovePlayer(moveDirX, moveDistance);
            }
            else
            {
                //Cannot move only on the X

                //Attempt only Z movement
                Vector3 moveDirZ = new Vector3(0, 0, moveDir.z).normalized;
                canMove = (moveDir.z < -.5f || moveDir.z > +.5f) && !Physics.CapsuleCast(transform.position, transform.position + (Vector3.up * playerHeight), playerRadius, moveDir, moveDistance);

                if (canMove)
                {
                    //Can move only on the Z
                    MovePlayer(moveDirZ, moveDistance);
                }
                else
                {
                    //Cannot move in any direction
                }
            }
        }
        else
        {
            MovePlayer(moveDir, moveDistance);
        }

        isWalking = moveDir != Vector3.zero;
        transform.forward = Vector3.Slerp(transform.forward, moveDir, Time.deltaTime * rotateSpeed);
    }

    private void MovePlayer(Vector3 moveDirection, float moveDistance)
    {
        transform.position += moveDirection * moveDistance;
    }
}