using System.Collections;
using System.Collections.Generic;
using Microsoft.Win32.SafeHandles;
using UnityEngine;

public class CharacterMovement : MonoBehaviour
{
    [SerializeField] private float walkSpeed = 2f;
    [SerializeField] private float runSpeed = 4f;
    [SerializeField] private float jumpForce = 4f;
    private float currentSpeed = 0f;
    private float speedSmoothVelocity = 0f;
    private float speedSmoothTime = 0.1f;
    private float rotationSpeed = 0.1f;
    private float gravity = 3f;

    private Transform mainCameraTransform;

    private CharacterController characterController;
    private Animator animator;

    private void Start()
    {
        characterController = GetComponent<CharacterController>();
        animator = GetComponent<Animator>();

        mainCameraTransform = Camera.main.transform;
    }

    private void Update()
    {
        Move();
    }

    private void Move()
    {
        Vector3 movementInput = new Vector3(Input.GetAxisRaw("Horizontal"), 0f, Input.GetAxisRaw("Vertical")).normalized;

        Vector3 forward = mainCameraTransform.forward;
        Vector3 right = mainCameraTransform.right;

        //forward.y = 0;
        //right.y = 0;

        forward.Normalize();
        right.Normalize();

        Vector3 desiredMoveDirection = (forward * movementInput.z + right * movementInput.x).normalized;
        Vector3 gravityVector = Vector3.zero;

        if (!characterController.isGrounded)
        {
            gravityVector.y -= gravity;
        }

        if (desiredMoveDirection != Vector3.zero)
        {
            transform.rotation = Quaternion.Slerp(transform.rotation, Quaternion.LookRotation(desiredMoveDirection),
                rotationSpeed);
        }

        float targetSpeed = walkSpeed * movementInput.magnitude;

        if (Input.GetKey(KeyCode.LeftShift))
        {
            targetSpeed = runSpeed * movementInput.magnitude;
        }

        currentSpeed = Mathf.SmoothDamp(currentSpeed, targetSpeed, ref speedSmoothVelocity, speedSmoothTime);

        characterController.Move(desiredMoveDirection * currentSpeed * Time.deltaTime);
        characterController.Move(gravityVector * Time.deltaTime);

        animator.SetFloat("MovementSpeed", 0.5f*movementInput.magnitude, speedSmoothTime, Time.deltaTime);
        if (Input.GetKey(KeyCode.LeftShift))
        {
            animator.SetFloat("MovementSpeed", 1f * movementInput.magnitude, speedSmoothTime, Time.deltaTime);
        }

        if (Input.GetKeyDown(KeyCode.Space) && characterController.isGrounded)
        {
            gravityVector.y = jumpForce;
        }
    }
}