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(untitled)

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using System.Collections.Generic;
using UnityEngine;

public class CollectableManager : MonoBehaviour
{
    // List of cube prefabs
    public List<GameObject> CubePrefabs;

// How many cubes to keep in front and behind the player
    public int CubeCountInFront = 1;
    public int CubeCountBehind = 0;

// Player reference
    public GameObject player;

// Pool of cubes (optional, not used yet)
    [SerializeField] private List<GameObject> CubePool = new List<GameObject>();

// Active cubes in the scene
    [SerializeField] private List<GameObject> Cubes = new List<GameObject>();

[SerializeField] private int numCubes = 0;

private float CubeLenZ;
    private float nextCubePosZ;

void Start()
    {
        if (CubePrefabs.Count == 0)
            Debug.LogError("No Cube Prefabs assigned to CollectableManager!");
        if (player == null)
            Debug.LogError("Player not assigned!");

// Assume all cubes are the same size; get Z length from first prefab
        CubeLenZ = CubePrefabs[0].GetComponentInChildren<Renderer>().bounds.size.z;

LayCubesAtBeginning();
    }

// Spawn initial cubes in front and behind player
    void LayCubesAtBeginning()
    {
        nextCubePosZ = -CubeLenZ / 2 - (CubeCountBehind - 1) * CubeLenZ;

for (int i = 0; i < CubeCountBehind + CubeCountInFront; i++)
        {
            AddACube();
        }
    }

// Find the cube index player is on
    int PlayerOnCubeIndex()
    {
        return Mathf.FloorToInt(player.transform.position.z / CubeLenZ);
    }

// Delete the cube at the back
    void DeleteEnd()
    {
        if (Cubes.Count > 0)
        {
            GameObject cubeToRemove = Cubes[0];
            Cubes.RemoveAt(0);
            Destroy(cubeToRemove);
        }
    }

// Add a new cube at the next position
    void AddACube()
    {
        int randomIndex = Random.Range(0, CubePrefabs.Count);
        GameObject newCube = Instantiate(CubePrefabs[randomIndex]);

newCube.transform.position = new Vector3(0f, 1f, nextCubePosZ);
        newCube.transform.parent = this.transform;

numCubes++;
        newCube.name = numCubes.ToString() + "_" + newCube.name;

Cubes.Add(newCube);

nextCubePosZ += CubeLenZ;
    }

// Called when the player collects a cube
    public void CubeAdjustment(GameObject ExitCube)
    {
        Debug.Log("Player collected cube at Z: " + ExitCube.transform.position.z);

AddACube();

if (Cubes.Contains(ExitCube))
        {
            Cubes.Remove(ExitCube);
            Destroy(ExitCube);
        }

while (Cubes.Count > CubeCountBehind + CubeCountInFront)
        {
            DeleteEnd();
        }
    }
}

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