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;
        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;
        }

        (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);
        }
        (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 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($"\nNo account was found with the email {email}.");
                return;
            }
            Console.WriteLine($"\nYou have logged into {activeGuest.FirstName} {activeGuest.LastName} ({email}).");
            activeReservation = HotelManager.GetResByGuestAndDate(activeGuest);
        }
        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 = new Guest(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}");
                activeGuest.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 "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);
        }
        ReservationType SelectReservation()
        {
            string input = "";
            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()
        {
            string input = "";
            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);
        }
        void EditReservationPrompt()
        {
            string input;
            DateTime NewStartDate = activeReservation.StartDate, NewEndDate = activeReservation.EndDate;
            ReservationType NewType = activeReservation.Type;

            bool completed = false;
            do
            {
                Console.Write("What information would you like to edit?\n" +
                    "If not and you wish to cancel, enter Q to exit. If you want to save and complete your changes, enter S.\n" +
                    "1. Reservation type\n" +
                    "2. Reservation dates\n" +
                    "Enter 1 or 2: ");
                input = Console.ReadLine();
                switch (input)
                {
                    case "Q": Console.WriteLine("Changes have has been deleted."); return;
                    case "1": NewType = SelectReservation(); break;
                    case "2": (NewStartDate, NewEndDate) = SelectDate(); break;
                    case "S": 
                        completed = true; 
                        (activeReservation.Type, activeReservation.StartDate, activeReservation.EndDate) = (NewType, NewStartDate, NewEndDate); 
                        break;
                    default: break;
                }
            } while (!completed);
        }
        void CreateNewReservation()
        {
            if (activeGuest == null)
            {
                Console.WriteLine("No guest is currently logged in, please login.");
                return;
            }
            if (activeReservation != null)
            {
                Console.WriteLine("You currently have an active registration.");
                return;
            }
            if (HotelManager.GetBaseRate() == null)
            {
                Console.WriteLine("Unable to proceed with reservation due to no base rate being set. Please inform an employee.");
                return;
            }

            string input;

            ReservationType Type;
            DateTime StartDate;
            DateTime EndDate;

            Type = SelectReservation();
            (StartDate, EndDate) = SelectDate();
            while((Type != ReservationType.SixtyDayAdvance &&
                (activeGuest.CreditCard == null || activeGuest.Expiration == null || activeGuest.CCV == null))) {
                Console.Write("The reservation type you chose requires you to specify your credit card.\n" +
                    "If you are unable to provide one, enter Q to quit or hit enter to continue.\n" +
                    ": ");
                input = Console.ReadLine();
                if (input == "Q")
                    return;
                GetCreditCardInformation();
            }

            Console.Write($"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. To cancel your reservation enter Q. Enter NO to edit your reservation.\n" +
                $": ");
            input = Console.ReadLine();
            while(input != "YES")
            {
                if (input == "NO")
                {
                    EditReservationPrompt();
                    Console.Write("You're changes have been saved. Are you done with your changes?\n" +
                        "Enter YES to finish, NO to continue editing, or Q to discard your reservation.\n" +
                        ": ");
                    input = Console.ReadLine();
                }
                else if (input == "Q")
                {
                    Console.WriteLine("Reservation has been deleted.");
                    return;
                } else
                {
                    Console.WriteLine("Input must be YES, NO, or Q.\n: ");
                    input = Console.ReadLine();
                }
            }
            activeReservation = new Reservation(activeGuest, Type, DateTime.Now.Date, StartDate, EndDate);
            Console.WriteLine("Your reservation has been made.");
        }
        void UpdateReservation()
        {
            string input = "NO";
            if (activeGuest == null)
            {
                Console.WriteLine("No guest is currently logged in, please login.");
                return;
            }
            if (activeReservation == null)
            {
                Console.WriteLine("You currently do not have an active registration.");
                return;
            }

            Console.Write("Your current reservation details are:\n" +
                $"\tStarts on: {activeReservation.StartDate.ToString("yyyy-MM-dd")}\n" +
                $"\tEnds on: {activeReservation.EndDate.ToString("yyyy-MM-dd")}\n");
            DateTime? _StartDate = null, _EndDate = null;
            do
            {
                if (input == "NO")
                {
                    (_StartDate, _EndDate) = SelectDate();
                    if (_StartDate.HasValue && _EndDate.HasValue)
                        Console.Write("Your new reservation details are:\n" +
                            $"\tStarts on: {activeReservation.StartDate.ToString("yyyy-MM-dd")} -> {_StartDate.Value.ToString("yyyy-MM-dd")}\n" +
                            $"\tEnds on: {activeReservation.EndDate.ToString("yyyy-MM-dd")} -> {_EndDate.Value.ToString("yyyy-MM-dd")}\n");
                    Console.Write("Are you done with your changes?\n" +
                        "Enter YES to finish and save, NO to continue editing.\n" +
                        ": ");
                } else if (input == "Q")
                {
                    Console.WriteLine("Your changes have been discarded.");
                    return;
                }
                else
                {
                    Console.WriteLine("Input must be YES, NO, or Q.");
                    Console.Write(": ");
                }
                input = Console.ReadLine();
            } while (input != "YES");
            if (_StartDate != null && _EndDate != null)
            {
                activeReservation.ChangeReservationDates((DateTime)_StartDate, (DateTime)_EndDate);
                Console.WriteLine("Your changes have been saved.");
            }
            return;
        }
        void CancelReservation()
        {
            if (activeGuest == null)
            {
                Console.WriteLine("No guest is currently logged in, please login.");
                return;
            }
            if (activeReservation == null)
            {
                Console.WriteLine("You currently do not have an active registration.");
                return;
            }
            string input;
            Console.Write("Would you like to cancel your reservation?\n" +
                "You may be charged depending on your reservation.\n" +
                "Enter YES to confirm or NO to exit: ");
            input = Console.ReadLine();
            while(input != "YES")
            {
                if (input == "NO")
                {
                    Console.Write("Reservation has not been cancelled.");
                    return;
                } else
                {
                    Console.Write("Your input must be YES or NO: ");
                    Console.ReadLine();
                }
            }
            activeReservation.CancelReservation();
            activeReservation = null;
            Console.Write("Reservation has been cancelled, you may be charged based on your reservation.");
        }
        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": UpdateReservation(); break;
                case "reservation cancel": CancelReservation(); 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" +
                "\tgenerate daily report - Generates a daily report on expected occupancy, room income, and incentive losses.\n" +
                "\tgenerate operational report - Generates a report of daily arrivals and occupancy.\n" +
                "\tgenerate accomodation bills - Generates an accomodation bill that will be handed to guests upon checkout.\n" +
                "\treservation cancel\n" +
                "Management Commands:" +
                "\tcheckin guest - Checks in a guest and assigns them a room.\n" +
                "\tcheckout guest - Checks out a guest and removes their room assignment.\n" +
                "\tbaserate set - Sets a new base rate to begin after a specified date.\n" +
                "Enter Q to quit.\n"
            );
            return;
        }

        void SetFutureBaseRate()
        {
            if (HotelManager.GetBaseRate() == null)
            {
                Console.Write("No base rate has been configured. " +
                    "You must set one for the current date.\n" +
                    "Enter new rate: ");
                Console.ReadLine();
            }
        }

        while (true)
        {

            string? input = Console.ReadLine();
            switch (input)
            {
                case "help": help(); break;
                case "generate daily report": break;
                case "generate operational report": break;
                case "generate accomodation bills": break;
                case "reservation cancel": break;
                case "checkin guest": break;
                case "checkout guest": break;
                case "baserate set": break;
                case "Q": return;
                default: Console.WriteLine("Unknown command, enter help for more inforamtion."); break;
            }
            Console.Write("\nCommand: ");
        }

    }
    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;
            }
        }
    }
}