gimm-platformer-project/Assets/Scripts/tetrominoSpawnManager.cs

using UnityEngine;
using Random = UnityEngine.Random;

public class tetrominoSpawnManager : MonoBehaviour
{
    public Vector3 spawnPoint;
    public GameObject tetrominoSquare;
    public GameObject tetrominoLine;
    public GameObject tetrominoL;
    public GameObject tetrominoR;
    public GameObject tetrominoS;
    public GameObject tetrominoT;
    public GameObject tetrominoZ;

    private int nextTetromino = 0;
    private GameObject nextTetrominoObject;

    public void spawnTetromino()
    {
        nextTetromino = Random.Range(1, 7);
        switch (nextTetromino)
        {
            case 0: //Square
                nextTetrominoObject = tetrominoSquare;
                break;
            case 1: //Line
                nextTetrominoObject = tetrominoLine;
                break;
            case 2: //T-piece
                nextTetrominoObject = tetrominoT;
                break;
            case 3: //L-piece
                nextTetrominoObject = tetrominoL;
                break;
            case 4: //R-piece
                nextTetrominoObject = tetrominoR;
                break;
            case 5: //S-piece
                nextTetrominoObject = tetrominoS;
                break;
            case 6: //Z-piece
                nextTetrominoObject = tetrominoZ;
                break;
            default: //if it's not a piece I have a prefab for yet, default to square
                nextTetrominoObject = tetrominoSquare;
                break;
        }

        Instantiate(nextTetrominoObject, spawnPoint, Quaternion.identity);

    }
}