using Ophelias.Models;
using Ophelias.Managers;
using Ophelias.Expressions;
using System.Data.SQLite;

class Program
{
    private static void GuestMode()
    {
        Reservation? activeReservation = null;
        Guest? activeGuest = null;
        (string, string) GetGuestName() {
            Console.Write("What is your first name: ");
            string FirstName = "";
            while (FirstName.Length == 0)
            {
                FirstName = Console.ReadLine();
                if (FirstName == "")
                    Console.Write("What is your first name: ");
            }
            Console.Write("What is your last name: ");
            string LastName = "";
            while (LastName.Length == 0)
            {
                LastName = Console.ReadLine();
                if (LastName == "")
                    Console.Write("What is your last name: ");
            }
            return (FirstName, LastName);
        }
        string GetGuestEmail()
        {
            Console.Write("What is your email: ");
            string Email = "";
            while (!Validation.ValidateEmail(Email))
            {
                Email = Console.ReadLine();
                if (!Validation.ValidateEmail(Email))
                    Console.Write("Please enter a valid email: ");
            }
            return Email;
        }
        void help()
        {
            Console.WriteLine(
                "Reservation Commands:\n" +
                "\treservation create - Create a new reservation.\n" +
                "\treservation update - Update your active reservation.\n" +
                "\treservation cancel - Cancel a reservation.\n" +
                "Account Commands:\n" +
                "\taccount create - Create a new guest account.\n" +
                "\taccount update - Update your account information.\n" +
                "\taccount login - Log into your guest account." +
                "Enter Q to quit.\n"
            );
            return;
        }
        void GuestLogin()
        {
            Console.Write("\nEnter your email address: ");
            string email = "";
            while (!Validation.ValidateEmail(email))
            {
                email = Console.ReadLine();
                if (!Validation.ValidateEmail(email))
                    Console.Write("Please enter a valid email: ");
            }
            activeGuest = HotelManager.GetGuestByEmail(email);
            if (activeGuest == null)
                Console.WriteLine($"\nNo account was found with the email {email}.");
            Console.WriteLine($"\nYou have logged into {activeGuest.FirstName} {activeGuest.LastName} ({email}).");
        }
        void CreateNewGuestPrompt()
        {
            (string FirstName, string LastName) = GetGuestName();
            string Email = GetGuestEmail();
            Console.Write("Would you like to enter your credit card details? (Y/n): ");
            string? CreditCard = null;
            string? CardExpiration = null;
            string? CCV = null;
            if (Console.ReadLine().Equals("y") || Console.ReadLine().Equals("Y"))
                (CreditCard, CardExpiration, CCV) = GetCreditCardInformation();

            activeGuest = HotelManager.CreateGuest(FirstName, LastName, Email, CreditCard: CreditCard, Expiration: CardExpiration, CCV: CCV);
            Console.Write($"You are now logged in as {FirstName} {LastName} ({Email})");
        }
        void UpdateGuestInformation()
        {
            if (activeGuest == null)
            {
                Console.WriteLine("No guest is currently logged in, please login.");
                return;
            }

            string? NewFname = null, NewLname = null, NewEmail = null, NewCard = null, NewExpiry = null, NewCCV = null;
            
            void SavePrompt()
            {
                if (NewFname == null && NewLname == null && NewEmail == null && NewCard == null && NewExpiry == null && NewCCV == null)
                {
                    Console.WriteLine("No changes have been made.");
                    return;
                }
                string changes = "";
                List<string> NewDetails = new List<string>();
                if (!string.IsNullOrEmpty(NewFname))
                {
                    NewDetails.Add($"\tFirst Name: {activeGuest.FirstName} -> {NewFname}"); 
                    activeGuest.FirstName = NewFname;
                }
                if (!string.IsNullOrEmpty(NewLname))
                {
                    NewDetails.Add($"\tLast Name: {activeGuest.LastName} -> {NewLname}");
                    activeGuest.LastName = NewLname;
                }
                if (!string.IsNullOrEmpty(NewEmail))
                {
                    NewDetails.Add($"\tEmail: {activeGuest.Email} -> {NewEmail}");
                    activeGuest.Email = NewEmail;
                }
                if (!string.IsNullOrEmpty(NewCard))
                {
                    NewDetails.Add($"\tCredit Card: {activeGuest.CreditCard} -> {NewCard}");
                    activeGuest.CreditCard = NewCard;
                }
                if (!string.IsNullOrEmpty(NewExpiry))
                {
                    NewDetails.Add($"\tCard Expiration Date: {activeGuest.Expiration} -> {NewExpiry}");
                    activeGuest.Expiration = NewExpiry;
                }
                if (!string.IsNullOrEmpty(NewCCV))
                {
                    NewDetails.Add($"\tCard CCV: {activeGuest.CCV} -> {NewCCV}");
                    activeGuest.CCV = NewCCV;
                }
                if (NewDetails.Count > 0)
                    changes += string.Join("\n", NewDetails);
                Console.WriteLine($"The following changes have been made:\n {changes}");
                HotelManager.UpdateGuest(activeGuest.Id, NewFname, NewLname, NewEmail, NewCard, NewExpiry, NewCCV);
                return;
            }

            Console.WriteLine($"You are currently logged in as {activeGuest.FirstName} {activeGuest.LastName} ({activeGuest.Email}).\n" +
                $"If this is not your account, please (Q)uit and log into your account. Changes will be recorded, but not saved\n" +
                $"until you enter S.\n");

            do
            {
                Console.Write("Please select the option you would like to change or enter S to save:\n" +
                    "1. First Name and Last Name\n" +
                    "2. Email Address\n" +
                    "3. Credit Card Information\n");
                switch (Console.ReadLine())
                {
                    case "Q": return;
                    case "q": return;
                    case "1": (NewFname, NewLname) = GetGuestName(); break;
                    case "2": NewEmail = GetGuestEmail(); break;
                    case "3": (NewCard, NewExpiry, NewCCV) = GetCreditCardInformation(); break;
                    case "S": SavePrompt(); return;
                    default: break;
                }
            } while (true);
        }
        void CreateNewReservation()
        {
            if (activeGuest == null)
                Console.WriteLine("No guest is currently logged in, please login.");
            if (activeReservation != null)
                Console.WriteLine("");

            string input = "";
            ReservationType SelectReservation()
            {
                Console.Write("What kind of reservation would you like to make?\n" +
                    "1. Conventional\n" +
                    "2. Prepaid\n" +
                    "3. 60 Day Advance\n" +
                    "4. Incentive\n" +
                    "Input a number: ");
                while (true)
                {
                    input = Console.ReadLine();
                    if (input == "1" || input == "2" || input == "3" || input == "4")
                        break;
                    Console.Write("Please enter either 1, 2, 3, or 4: ");
                }
                return (ReservationType)Convert.ToInt32(input);
            }
            (DateTime, DateTime) SelectDate()
            {
                DateTime _StartDate;
                DateTime _EndDate;
                Console.Write("When would you like to begin your stay.\n" +
                    "Your date input should be in in the following format - yyyy-MM-dd. Example: (2021-12-31)?\n" +
                    "Input a date (2021-12-31): ");
                while(true)
                {
                    input = Console.ReadLine();
                    if (DateTime.TryParse(input, out _StartDate))
                        break;

                    Console.Write("Please enter a valid date (2021-12-31): ");
                }
                Console.Write("When would you like to end your stay.\n" +
                   "Your date input should be in in the following format - yyyy-MM-dd. Example: (2021-12-31)?\n" +
                   "Input a date (2021-12-31): ");
                while (true)
                {
                    input = Console.ReadLine();
                    if (DateTime.TryParse(input, out _EndDate) && _EndDate > _StartDate)
                        break;

                    if (_EndDate < _StartDate)
                        Console.Write("End date cannot be before start date. Please enter a valid date (2021-12-31): ");
                    else
                        Console.Write("Please enter a valid date (2021-12-31): ");
                }
                return (_StartDate.Date, _EndDate.Date);
            }

            ReservationType Type;
            DateTime StartDate;
            DateTime EndDate;

            Type = SelectReservation();
            (StartDate, EndDate) = SelectDate();
            if (Type != ReservationType.SixtyDayAdvance &&
                (activeGuest.CreditCard == null || activeGuest.Expiration == null || activeGuest.CCV == null))
                GetCreditCardInformation();

            Console.WriteLine($"Thank you for filling out your reservation details. Currently you have made a {Type}" +
                $"reservation and are scheduled to stay from {StartDate.ToString("yyyy-MM-dd")} to {EndDate.ToString("yyyy-MM-dd")}." +
                $"If these details are correct, enter YES to complete. If they are not enter...\n" +
                $"1. Change your reservation type\n" +
                $"2. Change your reservation dates\n" +
                $": ");
            input = Console.ReadLine();
            if (input != "YES")
            {
                bool completed = false;
                do
                {
                    Console.Write("Would you like to edit any information, enter Q to exit and complete your reservation?\n" +
                        "1. Reservation type\n" +
                        "2. Reservation dates\n" +
                        "Enter 1 or 2: ");
                    switch (Console.ReadLine())
                    {
                        case "Q": completed = true; break;
                        case "q": completed = true; break;
                        case "1": SelectReservation(); break;
                        case "2": SelectDate(); break;
                        default: break;
                    }
                } while (!completed);
            }
            HotelManager.CreateReservation(activeGuest, Type, DateTime.Now.Date, StartDate, EndDate);
        }
        (string?, string?, string?) GetCreditCardInformation()
        {
            Console.Write("What is your credit card number: ");
            string CreditCard = "";
            while (!Validation.ValidateCreditCard(CreditCard))
            {
                CreditCard = Console.ReadLine().Trim().Replace("\t", "");
                if (CreditCard == "q" || CreditCard == "Q")
                    return (null, null, null);
                if (!Validation.ValidateCreditCard(CreditCard))
                    Console.Write("Please enter a valid credit card. If your card is expired, enter Q to cancel: ");
            }
            Console.Write("What is your credit card expiration date (MM/yy): ");
            string CardExpiration = "";
            while (!Validation.ValidateExpirationDate(CardExpiration))
            {
                CardExpiration = Console.ReadLine().Trim().Replace("\t", "");
                if (CardExpiration == "q" || CardExpiration == "Q")
                    return (null, null, null);
                if (!Validation.ValidateExpirationDate(CardExpiration))
                    Console.Write("Please enter a valid expiration date. If your card is expired, enter Q to cancel: ");
            }
            Console.Write("What is your credit card CCV: ");
            string CCV = "";
            while (!Validation.ValidateCCV(CCV))
            {
                CCV = Console.ReadLine().Trim().Replace("\t", "");
                if (CCV == "q" || CCV == "Q")
                    return (null, null, null);
                if (!Validation.ValidateCCV(CCV))
                    Console.Write("Please enter a valid credit card CCV. If your card is expired, enter Q to cancel: ");
            }
            return (CreditCard, CardExpiration, CCV);
        }
        Console.Write(
                "\nWelcome to the Ophelias Oasis Hotel Registration System!\n" +
                "Type help to get a full list of commands or enter a command.\n" +
                "Command: "
        );
        while (true)
        {
            
            string? input = Console.ReadLine();
            switch(input)
            {
                case "help": help(); break;
                case "reservation create": CreateNewReservation(); break;
                case "reservation update": break;
                case "reservation cancel": break;
                case "account create": CreateNewGuestPrompt(); break;
                case "account update": UpdateGuestInformation();  break;
                case "account login": GuestLogin(); break;
                case "q": return;
                default: Console.WriteLine("Unknown command, enter help for more inforamtion."); break;
            }
            Console.Write("\nCommand: ");
        }
    }
    private void AdminMode()
    {
        void help()
        {
            Console.WriteLine(
                "Report Commands:\n" +
                "\treservation create\n" +
                "\treservation update\n" +
                "\treservation cancel\n" +
                "Account Commands:" +
                "\taccount create\n" +
                "\taccount update\n" +
                "Enter Q to quit.\n"
            );
            return;
        }
    }
    static void Main()
    {
        
        if (!File.Exists("database.sqlite3") || new FileInfo("database.sqlite3").Length == 0)
        {
            SQLiteConnection.CreateFile("database.sqlite3");
            using (DatabaseManager Manager = new DatabaseManager())
            {
                Manager.InitializeTables();
                Manager.InitializeRoomsTable();
            }
        }

        bool run = true;
        while (run)
        {
            Console.Write(
                "Are you an employee or customer?\n" +
                "1. Employee\n" +
                "2. Customer/ Guest\n" +
                ": "
            );
            switch(Console.ReadLine().ToUpper())
            {
                case "1": break;
                case "2": GuestMode(); break;
                case "Q": run = false; break;
                default: Console.WriteLine("You must either specify 1 for Employee, 2 for Customer/ Guest, or Q to quit.\n\n"); break;
            }
        }
    }
}