using System;


namespace DossierProject
{
    class Program
    {
        private static readonly string[] ConsoleOutputs = new string[]
        {
            ",",
            "Input surname and position via comma:",
            "Dossier successfully added!",
            "Input number of dossier, that U want remove:",
            "No dossiers!",
            "Dossier successfully deleted!",
            "Press any key to return:",
            "Input surname for search:",
            "Nothing is found!",
            "Results:"
        };

        private static readonly string[] MenuItems = new string[]
        {
            "Add new dossier",
            "Show all dossiers",
            "Delete dossier",
            "Search by surname",
            "Quit"
        };

        private static string[] Surnames = new string[0];
        private static string[] Positions = new string[0];
        private static int MenuPosition = 0;


        static void Main(string[] args)
        {
            PrintMenu();
            Menu();
        }

        private static void Menu()
        {
            while (true)
            {
                var key = Console.ReadKey().Key;

                switch (key)
                {
                    case ConsoleKey.UpArrow:
                        {
                            if (MenuPosition > 0)
                            {
                                MenuPosition--;
                                PrintMenu();
                            }

                            break;
                        }
                    case ConsoleKey.DownArrow:
                        {
                            if (MenuPosition < MenuItems.Length - 1)
                            {
                                MenuPosition++;
                                PrintMenu();
                            }

                            break;
                        }
                    case ConsoleKey.Enter:
                        {
                            OnMenuItemSelected();
                            break;
                        }
                    default: break;
                }
            }
        }

        private static void OnMenuItemSelected()
        {
            switch (MenuPosition)
            {
                case 0: AddDossier(); break;
                case 1: ShowAllDosiers(); break;
                case 2: DeleteDossier(); break;
                case 3: SearchDossier(); break;
                case 4: Environment.Exit(0); break;
                default: break;
            }
        }

        private static void AddDossier()
        {
            Console.Clear();
            Console.WriteLine(ConsoleOutputs[1]);

            while (true)
            {
                string line = Console.ReadLine();

                if (line.Contains(ConsoleOutputs[0]))
                {
                    string[] tempSurnames = new string[Surnames.Length + 1];
                    string[] tempPositions = new string[Positions.Length + 1];

                    for (int i = 0; i < Surnames.Length; i++)
                    {
                        tempSurnames[i] = Surnames[i];
                    }

                    for (int i = 0; i < Positions.Length; i++)
                    {
                        tempPositions[i] = Positions[i];
                    }

                    tempSurnames[tempSurnames.Length - 1] = line.Split(',')[0];
                    tempPositions[tempPositions.Length - 1] = line.Split(',')[1];

                    Surnames = tempSurnames;
                    Positions = tempPositions;

                    Console.Clear();
                    Console.WriteLine(ConsoleOutputs[2]);
                    Console.ReadKey();
                    break;
                }
            }

            PrintMenu();
        }

        private static void DeleteDossier()
        {
            Console.Clear();

            if (Surnames.Length == 0)
            {
                Console.WriteLine(ConsoleOutputs[4]);
                Console.ReadKey();
            }
            else
            {
                while (true)
                {
                    Console.WriteLine(ConsoleOutputs[2]);
                    Console.WriteLine();

                    for (int i = 0; i < Surnames.Length; i++)
                    {
                        Console.WriteLine((i + 1) + ") " + Surnames[i] + " - " + Positions[i]);
                    }

                    Console.WriteLine();

                    string line = Console.ReadLine();

                    if (int.TryParse(line, out int number))
                    {
                        number -= 1;

                        if (number >= 0 && number < Surnames.Length)
                        {
                            string[] tempSurnames = new string[Surnames.Length - 1];
                            string[] tempPositions = new string[Positions.Length - 1];

                            int iteratorSurnames = 0;
                            int iteratorPositions = 0;

                            for (int i = 0; i < tempSurnames.Length; i++)
                            {
                                if (i == number)
                                {
                                    iteratorSurnames++;
                                }

                                tempSurnames[i] = Surnames[iteratorSurnames];

                                iteratorSurnames++;
                            }

                            for (int i = 0; i < tempPositions.Length; i++)
                            {
                                if (i == number)
                                {
                                    iteratorPositions++;
                                }

                                tempPositions[i] = Positions[iteratorPositions];

                                iteratorPositions++;
                            }

                            Surnames = tempPositions;
                            Positions = tempPositions;

                            Console.Clear();
                            Console.WriteLine(ConsoleOutputs[5]);
                            Console.ReadKey();
                            break;
                        }
                        else
                        {
                            Console.Clear();
                        }
                    }
                    else
                    {
                        Console.Clear();
                    }
                }
            }

            PrintMenu();
        }

        private static void ShowAllDosiers()
        {
            Console.Clear();

            if (Surnames.Length == 0)
            {
                Console.WriteLine(ConsoleOutputs[4]);
            }
            else
            {
                Console.WriteLine(ConsoleOutputs[6]);
                Console.WriteLine();

                for (int i = 0; i < Surnames.Length; i++)
                {
                    Console.WriteLine((i + 1) + ") " + Surnames[i] + " - " + Positions[i]);
                }
            }

            Console.ReadKey();
            PrintMenu();
        }

        private static void SearchDossier()
        {
            Console.Clear();

            if (Surnames.Length == 0)
            {
                Console.WriteLine(ConsoleOutputs[4]);
            }
            else
            {
                Console.WriteLine(ConsoleOutputs[7]);
                Console.WriteLine();

                string surname = Console.ReadLine();
                int founded = 0;

                Console.Clear();
                Console.WriteLine(ConsoleOutputs[9]);
                Console.WriteLine();

                for (int i = 0; i < Surnames.Length; i++)
                {
                    if (Surnames[i].Contains(surname))
                    {
                        Console.WriteLine(Surnames[i] + " - " + Positions[i]);
                        founded++;
                    }
                }

                if (founded == 0)
                {
                    Console.Clear();
                    Console.WriteLine();
                    Console.WriteLine(ConsoleOutputs[8]);
                }
            }

            Console.ReadKey();
            PrintMenu();
        }

        private static void PrintMenu()
        {
            Console.Clear();

            for (int i = 0; i < MenuItems.Length; i++)
            {
                if (i == MenuPosition)
                {
                    Console.ForegroundColor = ConsoleColor.Red;
                    Console.WriteLine(MenuItems[i]);
                    Console.ForegroundColor = ConsoleColor.Gray;
                }
                else
                {
                    Console.WriteLine(MenuItems[i]);
                }
            }
        }
    }
}