using System;

using System.Collections.Generic;

using System.Diagnostics;

public class Program

{

    static List<string> pooledObjects;

    static string objectToPool="bullet "; //this would be actual gameobject bullet in unity

    static int amountToPool = 20;

    public static void Main()

    {

        Program p = new Program();

        ObjectPool(); // pre-loading the pool with amountToPool bullets

        p.Gun(); //shooting the gun

        //ReadObjects();

        p.Gun();

    }

    static void ObjectPool()

    {

        Console.WriteLine("Running ObjectPool");

        pooledObjects = new List<string>();

        string tmp="";

        for(int i = 0; i < amountToPool; i++)

        {

            tmp += objectToPool + i + " inactive";

            pooledObjects.Add(tmp);

            Console.WriteLine("created " + i);

            tmp = "";

        }

    }

    static string GetPooledObject()

    {

        Console.WriteLine("Running GetPooledObject");

        for(int i = 0; i < amountToPool; i++)

        {

            if(pooledObjects[i].Contains("inactive")) //check if bullet available

            {

                Console.WriteLine("found inactive bullet #" + i + ", setting it active and returning");

                pooledObjects[i] = pooledObjects[i].Replace("inactive", "active"); //mark bullet unavailable

                return pooledObjects[i];

            }

            else

                Console.WriteLine("Bullet " + i + " already active"); //will write every failed check

        }

        return null;

    }

    void Gun()

    {

        Console.WriteLine("Pulling trigger..");

        string tmp = (GetPooledObject()); //request bullet from pool

        if (tmp != null) //check if successfully returned a result

        {

            Console.WriteLine("GUNSHOT"); //this is where we would fire the bullet

            BulletRecycler((int)Char.GetNumericValue(tmp[7])); // find bullet n from string and initiate the recall with timer

        }

    }

    void BulletRecycler(int i)

    {

        int bulletN = i;

        //System.Threading.Thread.Sleep(1000); // wait for a set time to return the bullet to pool

        var sw = Stopwatch.StartNew();

        while (sw.Elapsed < TimeSpan.FromSeconds(1))

        {

            System.Threading.Thread.Sleep(50);

            Console.Write(".");

        }

        pooledObjects[bulletN] = pooledObjects[bulletN].Replace("active", "inactive"); // return bullet to pool

        Console.WriteLine(bulletN + " inactivated");

    }

    /*

        static void ReadObjects()

    {

        foreach(string i in pooledObjects)

        {

            Console.WriteLine(i);

        }

    }

    */

}