using System;

using System.Collections.Generic;

using System.Linq;

​

​

​

class Program1

{

    static void Main()

    {

        List<TempSuspendHIstory> history = new List<TempSuspendHIstory>

        {

            new TempSuspendHIstory { StartDate = new DateTime(2025, 1, 1), EndDate = new DateTime(2025, 1, 30) },

            new TempSuspendHIstory { StartDate = new DateTime(2025, 3, 1), EndDate = new DateTime(2025, 3, 30) }

        };

​

        SuspensionManager manager = new SuspensionManager(history);

​

        DateTime ErStartdat = manager.GetEarliestStartDate();

        Console.WriteLine($"allowed start date: {ErStartdat:yyyy-MM-dd}");

​

        DateTime startDate;

        while (true)

        {

            Console.Write("Enter start date (yyyy-MM-dd): ");

            if (DateTime.TryParse(Console.ReadLine(), out startDate) && startDate >= ErStartdat)

            {

                break;

            }

            Console.WriteLine($"Start date must be on or after {ErStartdat:yyyy-MM-dd}");

        }

​

        DateTime mxenddate = manager.GetMaxEndDate(startDate);

        Console.WriteLine($"Maximum allowed end date for {startDate:yyyy-MM-dd}: {mxenddate:yyyy-MM-dd}");

​

        DateTime endDate;

        while (true)

        {

            Console.Write("Enter end date (yyyy-MM-dd):");

            if (DateTime.TryParse(Console.ReadLine(), out endDate) && endDate <= mxenddate)

            {

                break;

            }

            Console.WriteLine($"Error: End date must be on or before {mxenddate:yyyy-MM-dd}");

        }

​

        // Success Message

        Console.WriteLine($"Suspension from {startDate:yyyy-MM-dd} to {endDate:yyyy-MM-dd} is valid!");

    }

}

class TempSuspendHIstory

{

    public DateTime StartDate { get; set; }

    public DateTime EndDate { get; set; }

}

​

class SuspensionManager

{

    private const int MaxSuspendDaysPerYear = 180;

    private List<TempSuspendHIstory> SuspendHistoryList;

​

    public SuspensionManager(List<TempSuspendHIstory> suspendHistoryList)

    {

        SuspendHistoryList = suspendHistoryList ?? new List<TempSuspendHIstory>();

    }

​

​

    public DateTime GetEarliestStartDate()

    {

        DateTime today = DateTime.Today;

        DateTime oneDayAfterToday = today.AddDays(1);

​

        var lastHistory = SuspendHistoryList.OrderByDescending(s => s.EndDate).FirstOrDefault();

​

        int usedSuspendDays = SuspendHistoryList

            .Where(s => s.StartDate.Year == today.Year)

            .Sum(s => (s.EndDate - s.StartDate).Days + 1);

​

        if (usedSuspendDays >= MaxSuspendDaysPerYear)

        {

            return lastHistory.StartDate.AddYears(1); 

        }

​

        return oneDayAfterToday; 

    }

​

    public DateTime GetMaxEndDate(DateTime startDate)

    {

        int usedSuspendDays = SuspendHistoryList

            .Where(s => s.StartDate.Year == startDate.Year)

            .Sum(s => (s.EndDate - s.StartDate).Days + 1);

​

        int remainingDays = MaxSuspendDaysPerYear - usedSuspendDays;

        return startDate.AddDays(remainingDays - 1);

    }

}

​

​