CourierOld/Game/CourierOld/Assets/Code/Gameplay/Character/Controller/Movement/AirMovementSystem.cs

using UnityEngine;
using Code.Gameplay.Character.Controller.Input;
using KinematicCharacterController;

namespace Code.Gameplay.Character.Controller.Movement
{
    public class AirMovementSystem
    {
        private readonly Vector3 _gravity;
        private readonly float _maxAirSpeed;
        private readonly float _airControlSharpness;

        public AirMovementSystem(Vector3 gravity, float maxAirSpeed, float airControlSharpness)
        {
            _gravity = gravity;
            _maxAirSpeed = maxAirSpeed;
            _airControlSharpness = airControlSharpness;
        }

        public void UpdateVelocity(ref Vector3 currentVelocity, CharacterInputHandler inputHandler, KinematicCharacterMotor motor, float deltaTime)
        {
            currentVelocity += _gravity * deltaTime;

            var horizontalVelocity = Vector3.ProjectOnPlane(currentVelocity, motor.CharacterUp);
            var verticalVelocity = Vector3.Dot(currentVelocity, motor.CharacterUp) * motor.CharacterUp;

            var desiredHorizontalMovement = Vector3.ProjectOnPlane(inputHandler.MoveInputVector, motor.CharacterUp).normalized * _maxAirSpeed;

            horizontalVelocity = Vector3.Lerp(
                horizontalVelocity,
                desiredHorizontalMovement,
                1f - Mathf.Exp(-_airControlSharpness * deltaTime)
            );

            currentVelocity = horizontalVelocity + verticalVelocity;
        }
    }
}