PGiZ4/Assets/Code/Gameplay/Player/PlayerController.cs

using UnityEngine;

namespace Code.Gameplay.Player
{
    public class PlayerController : MonoBehaviour
    {
        [SerializeField] private float forwardSpeed = 10f;
        [SerializeField] private float maxSpeed = 40f;
        [SerializeField] private float laneDistance = 5f;
        [SerializeField] private float jumpForce = 11f;
        [SerializeField] private float gravity = 20f;

        private int _targetLane = 1;

        private CharacterController _controller;
        private Vector3 _direction;
        
        public System.Action OnPlayerDeath;
        private bool _isDead = false;

        private void Start()
        {
            _controller = GetComponent<CharacterController>();
        }

        private void Update()
        {
            if (_isDead) return;

            if (UnityEngine.Input.GetKeyDown(KeyCode.RightArrow) || UnityEngine.Input.GetKeyDown(KeyCode.D))
            {
                _targetLane = Mathf.Min(_targetLane + 1, 2);
            }
            else if (UnityEngine.Input.GetKeyDown(KeyCode.LeftArrow) || UnityEngine.Input.GetKeyDown(KeyCode.A))
            {
                _targetLane = Mathf.Max(_targetLane - 1, 0);
            }

            var targetPosition = transform.position.z * transform.forward + transform.position.y * transform.up;

            switch (_targetLane)
            {
                case 0:
                    targetPosition += Vector3.left * laneDistance;
                    break;
                case 2:
                    targetPosition += Vector3.right * laneDistance;
                    break;
            }

            if (_controller.isGrounded)
            {
                _direction.y = -1f;

                if (UnityEngine.Input.GetKeyDown(KeyCode.Space))
                {
                    _direction.y = jumpForce;
                }
            }
            else
            {
                _direction.y -= gravity * Time.deltaTime;
            }

            _direction.z = forwardSpeed;

            var diff = targetPosition - transform.position;
            var moveDir = diff.normalized * (25f * Time.deltaTime);

            var moveX = Mathf.Clamp(diff.x, -moveDir.magnitude, moveDir.magnitude);

            var finalMove = new Vector3(moveX, _direction.y * Time.deltaTime, _direction.z * Time.deltaTime);

            _controller.Move(finalMove);
            CheckForDeath();
        }

        public void IncreaseSpeed(float amount)
        {
            if (forwardSpeed < maxSpeed)
            {
                var desirableSpeed = forwardSpeed + amount;
                forwardSpeed = Mathf.Min(desirableSpeed, maxSpeed);
            }
        }
        
        private void OnTriggerEnter(Collider foreign)
        {
            if (foreign.CompareTag("Coin"))
            {
                UI.GameplayController.Instance.AddCoin();

                Destroy(foreign.gameObject);
            }
        }
        
        private void CheckForDeath()
        {
            if (_isDead) return;

            if (Time.timeSinceLevelLoad > 1f && _controller.velocity.z <= 0.1f)
            {
                Die();
            }
        }
        
        private void Die()
        {
            _isDead = true;
            forwardSpeed = 0;
            _direction = Vector3.zero;
            OnPlayerDeath?.Invoke();
        }
    }
}