using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        private const int STORED_RESULTS = 5;
        private readonly List<Tuple<string, int>> _results = new List<Tuple<string, int>>();

        public Form1()
        {
            InitializeComponent();
        }

        private void GetSumBtn_Click(object sender, EventArgs e)
        {
            var result = ParseNumSequence(NumSequenceTextBox.Text);

            if (result == null)
            {
                MessageBox.Show("Incorrect sequence.");
                return;
            }

            _results.Add(result);

            if (_results.Count == STORED_RESULTS)
            {
                var formattedResults = _results
                    .Select(t => $"{t.Item1}: {t.Item2}")
                    .ToArray();

                ResultsListBox.Items.Clear();
                ResultsListBox.Items.AddRange(formattedResults);
            }
            else if (_results.Count == STORED_RESULTS + 1)
            {
                ResultsListBox.Items.Clear();
                _results.RemoveRange(0, _results.Count - 1);
            }

            NumSequenceTextBox.Clear();
            InfoLabel.Text = $"обработано {_results.Count} из {STORED_RESULTS} строк";
        }

        private Tuple<string, int> ParseNumSequence(string text)
        {
            var acceptedSymbols = text
                .Where(t => char.IsDigit(t) || t == ' ')
                .ToArray();

            string sequence = new string(acceptedSymbols).Trim();

            if (string.IsNullOrEmpty(sequence) || string.IsNullOrWhiteSpace(sequence))
                return null;

            int sum = sequence
                .Split(new string[] { " " }, StringSplitOptions.RemoveEmptyEntries)
                .Select(t => int.Parse(t))
                .Sum();

            return new Tuple<string, int>(sequence, sum);
        }
    }
}