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

namespace ConsoleApp
{
    internal class MenuManager
    {
        public DataManager DataManager { get; private set; }
        public Stack<Menu.IMenu> MenuCallStack { get; set; }

        public MenuManager(DataManager dataManager, Menu.IMenu firstMenu)
        {
            DataManager = dataManager;

            MenuCallStack = new Stack<Menu.IMenu>();
            MenuCallStack.Push(firstMenu);
        }

        private void WriteMenuMode(Menu.IMenu menu, ConsoleKeyInfo cki)
        {
            if (!menu.WriteMode)
            {
                return;
            }

            if (cki.Key == ConsoleKey.Backspace && menu.InputStr.Length > 0)
            {
                menu.InputStr.Remove(menu.InputStr.Length-1, 1);
                return;
            }

            menu.InputStr.Append(cki.KeyChar);
        }

        public void Loop()
        {
            ConsoleKeyInfo cki;
            Menu.IMenu menuOnHead;
            do
            {
                menuOnHead = MenuCallStack.Peek();
                menuOnHead.Update();
                menuOnHead.Display();

                cki = Console.ReadKey(true);
                switch (cki.Key)
                {
                    case ConsoleKey.DownArrow:
                        menuOnHead.SelectNext();
                        break;
                    case ConsoleKey.UpArrow:
                        menuOnHead.SelectPrevious();
                        break;
                    case ConsoleKey.Enter:
                        menuOnHead.Return();
                        MenuCallStack.Pop();
                        break;
                    case ConsoleKey.R:
                        menuOnHead.ToggleWriteMode();
                        break;
                    default:
                        WriteMenuMode(menuOnHead, cki);
                        break;
                }
            } while (MenuCallStack.Count > 0);

        }
    }
}