using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    private static List<Tuple<bool, long, long, long, long>> testData = new List<Tuple<bool, long, long, long, long>>()

    {

        Tuple.Create<bool, long, long, long, long>(true,0,0,0,1),

        Tuple.Create<bool, long, long, long, long>(false,0,1,1,1),

        Tuple.Create<bool, long, long, long, long>(true,0,0,1,1),

        Tuple.Create<bool, long, long, long, long>(true,0,0,24,16),

        Tuple.Create<bool, long, long, long, long>(false,10,5,12,4),

        Tuple.Create<bool, long, long, long, long>(true,10,5,12,7),

        Tuple.Create<bool, long, long, long, long>(false,10,5,7,7),

        Tuple.Create<bool, long, long, long, long>(false,-1,-1,7,7),

        Tuple.Create<bool, long, long, long, long>(true,-1,2,7,7),

        Tuple.Create<bool, long, long, long, long>(true,2,-1,7,7),

        Tuple.Create<bool, long, long, long, long>(false,-1,10,7,7),

        Tuple.Create<bool, long, long, long, long>(false,10,-1,7,7),

    };

    public static void Main()

    {

        IEnumerable<Tuple<int, bool>> results = testData.Select((x, i) => Tuple.Create<int, bool>(i, x.Item1 == ShouldDelete(x.Item2, x.Item3, x.Item4, x.Item5)));

        foreach(var result in results)

            Console.WriteLine($"i = {result.Item1.ToString("00")}  :  passed = {result.Item2}");

    }

    public static bool ShouldDelete(long minMonthsOldBeforeDelete, long minVersionsToKeep, long ageInMonths, long versionsBehind)

    {

        bool deleteDueToAge = minMonthsOldBeforeDelete != -1 && ageInMonths >=  minMonthsOldBeforeDelete;

        bool deleteDueToVersionBehind = minVersionsToKeep != -1 && versionsBehind >  minVersionsToKeep;

        if (deleteDueToAge && deleteDueToVersionBehind)

            return true;

        else if (minMonthsOldBeforeDelete == -1 && deleteDueToVersionBehind)

            return true;

        else if (minVersionsToKeep == -1 && deleteDueToAge)

            return true;

        else

            return false;

    }

}