SAE-2.01/MCTG/ConsoleApp/Menu/SelectMenu.cs

using ConsoleApp;
using Model;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;


namespace ConsoleApp.Menu
{
    /// <summary>
    /// An abstract class that define the components of a selection-type menu.
    /// </summary>
    /// <typeparam name="T">The return type of the currently selected item</typeparam>
    public abstract class SelectMenu<T> : IMenuDisplay
    {
        protected int _currentLine = 0;
        protected int _maxLines = 0;

        /// <summary>
        /// The currently selected item.
        /// </summary>
        public T? CurrentSelected { get; protected set; }

        /// <summary>
        /// The current line selected in the menu.
        /// </summary>
        public int CurrentLine
        {
            get => _currentLine;
            protected set
            {
                _currentLine = value;
                if (_currentLine > _maxLines)
                {
                    _currentLine = _maxLines;
                }
                if (_currentLine < 0)
                {
                    _currentLine = 0;
                }
                return;
            }
        }

        public int SelectNextLine() { return ++CurrentLine; }
        public int SelectPrevioustLine() { return --CurrentLine; }

        public abstract void UpdateDisplay();
    }
}