using Model;
using System;
using System.Collections.Generic;
using System.ComponentModel.Design;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp.Menu
{
    internal abstract class Menu<T> : IMenu
        where T : notnull
    {
        protected StringBuilder _screenDisplay;
        protected readonly List<Selector<T>>? _selectList;

        public string Title { get; private set; }
        public StringBuilder InputStr { get; set; }
        public int CurrentLine { get; private set; }
        public T? CurrentSelected { get; private set; }
        public bool WriteMode { get; set; }

        private Menu(string title)
        {
            Title = title;
            CurrentLine = 0;
            WriteMode = false;
            _screenDisplay = new StringBuilder();
            InputStr = new StringBuilder();
        }

        public Menu(string title, params Selector<T>[] selections ) : this(title)
        {
            if (selections == null || selections.Length == 0)
                throw new ArgumentException("Error: a menu must contain at least 1 selection");

            _selectList = selections.ToList();
            CurrentSelected = _selectList[0].Item;
        }

        public virtual void Display()
        {
            Console.WriteLine(_screenDisplay);
        }

        public virtual void Update()
        {
            _screenDisplay.AppendLine($"[ {Title} ]");
            _screenDisplay.AppendLine("-------------------------------------------\n");

            foreach (Selector<T> selector in _selectList)
            {
                if (selector.Equals(CurrentSelected))
                    _screenDisplay.Append($">  ");
                else
                    _screenDisplay.Append($"   ");

                _screenDisplay.AppendLine($"{selector.Line}");
            }
        }

        public void SelectNext()
        {
            CurrentSelected = _selectList[++CurrentLine].Item;
        }

        public void SelectPrevious()
        {
            CurrentSelected = _selectList[--CurrentLine].Item;
        }

        public void EnableWriteMode()
        {
            WriteMode = true;
        }

        public void DisableWriteMode()
        {
            WriteMode = false;
        }

        public abstract void Return();
    }
}