Loot Table

using System.Collections.Generic;
using UnityEngine;

namespace DawidNoras
{
    public class LootTable<T> where T : class
    {
        private class LootTableObject
        {
            public readonly int number;
            public readonly T value;

            public LootTableObject(int number, T value)
            {
                this.number = number;
                this.value = value;
            }
        }

        private IList<LootTableObject> objects = new List<LootTableObject>();

        public int CombinedWeight { get; private set; }

        public void Add(T obj, int weight)
        {
            CombinedWeight += weight;
            objects.Add(new LootTableObject(CombinedWeight, obj));
        }

        public T GetRandomObject()
        {
            var randomNumber = Random.Range(0, CombinedWeight + 1);
            return GetObject(randomNumber);
        }

        public T GetObject(int value)
        {
            value = Mathf.Clamp(value, 0, CombinedWeight);
            foreach (var obj in objects)
            {
                if (value <= obj.number)
                {
                    return obj.value;
                }
            }
            return null;
        }
    }
}