using System;
using System.Collections.Generic;

namespace Sony.Filtr.Utility.Extensions
{
    public class Batch
    {
        public readonly int Offset;
        public readonly int Limit;

        public Batch(int offset, int limit)
        {
            this.Offset = offset;
            this.Limit = limit;
        }
    }

    public static class IntExtensions
    {
        public static Batch[] Batch(this int total, int batchSize)
        {
            var batches = new List<Batch>();
            int currentOffset = 0;
            int currentLimit = 0;

            while (currentOffset < total)
            {
                currentLimit = (total - currentOffset) > batchSize ? batchSize : total - currentOffset;
                batches.Add(new Batch(currentOffset, currentLimit));
                currentOffset += currentLimit;
            }

            return batches.ToArray();
        }
    }
}