Danro/Assets/Scripts/Entities/Props/BatCollectible.cs

using UnityEngine;

namespace RR.Common.Entities.Props
{
    public sealed class BatCollectible : EnvironmentalCollectibleBase
    {
        public override bool CountsTowardsSharedCollectionLimit => true;

        [SerializeField] private float moveSpeed = 1.75f;
        [SerializeField] private float verticalAmplitude = 0.35f;
        [SerializeField] private float verticalFrequency = 2.4f;
        [SerializeField] private float horizontalWaveAmplitude = 0.2f;
        [SerializeField] private float horizontalWaveFrequency = 1.35f;
        [SerializeField] private float maxRange = 3.5f;
        [SerializeField] private float directionChangeIntervalMin = 1.5f;
        [SerializeField] private float directionChangeIntervalMax = 3.5f;

        private Vector3 _anchorPosition;
        private Vector3 _currentPosition;
        private float _time;
        private float _directionTimer;
        private float _nextDirectionChangeTime;
        private int _moveDirection;

        protected override void OnSpawned()
        {
            _anchorPosition = SpawnPosition;
            _currentPosition = transform.position;
            _time = 0f;
            _directionTimer = 0f;
            _moveDirection = 1;
            _nextDirectionChangeTime = Random.Range(directionChangeIntervalMin, directionChangeIntervalMax);
        }

        protected override void TickBehaviour(float dt)
        {
            _time += dt;
            _directionTimer += dt;

            if (_directionTimer >= _nextDirectionChangeTime)
            {
                FlipDirection();
                _directionTimer = 0f;
                _nextDirectionChangeTime = Random.Range(directionChangeIntervalMin, directionChangeIntervalMax);
            }

            Vector3 position = _currentPosition;
            position.x += _moveDirection * moveSpeed * dt;

            float xOffsetFromAnchor = position.x - _anchorPosition.x;
            if (Mathf.Abs(xOffsetFromAnchor) > maxRange)
            {
                position.x = _anchorPosition.x + Mathf.Sign(xOffsetFromAnchor) * maxRange;
                FlipDirection();
                _directionTimer = 0f;
                _nextDirectionChangeTime = Random.Range(directionChangeIntervalMin, directionChangeIntervalMax);
            }

            float verticalOffset = Mathf.Sin(_time * verticalFrequency) * verticalAmplitude;
            float horizontalOffset = Mathf.Sin(_time * horizontalWaveFrequency) * horizontalWaveAmplitude;

            position.y = _anchorPosition.y + verticalOffset;
            position.x += horizontalOffset * dt;

            _currentPosition = position;
            transform.position = position;
        }

        private void FlipDirection()
        {
            _moveDirection = -_moveDirection;

            Vector3 scale = transform.localScale;
            float xScale = Mathf.Abs(scale.x);
            scale.x = _moveDirection > 0 ? xScale : -xScale;
            transform.localScale = scale;
        }
    }
}