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

namespace Ophelias.Managers
{
    internal class DatabaseManager : IDisposable
    {
        internal SQLiteConnection con = new SQLiteConnection("DataSource=database.sqlite3;Version=3;");

        internal DatabaseManager()
        {
            Connect();
        }
        internal void Connect()
        {
            con.Open();
        }
        internal void Close()
        {
            con.Close();
            con.Dispose();
        }
        internal void InitializeTables()
        {
            string tableCommands =
                @"CREATE TABLE IF NOT EXISTS [transactions] (
                  [ID] INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
                  [Rate] INTEGER NOT NULL,
                  [Owed] INTEGER NOT NULL,
                  [Penalty] INTEGER NULL,
                  [Multiplier] INTEGER NOT NULL,
                  [RefundAmount] INTEGER NOT NULL,
                  [PayBy] TEXT NOT NULL,
                  [LastPaid] TEXXT NULL,
                  [PaidOn] TEXT NULL);

                CREATE TABLE IF NOT EXISTS [reservations] (
                  [ID] INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
                  [RoomID] INTEGER NOT NULL,
                  [GuestID] INTEGER NOT NULL,
                  [TransactionID] INTEGER NOT NULL,
                  [IsNoShow] BOOLEAN NOT NULL CHECK ([IsNoShow] IN (0,1)),
                  [Type] INTEGER NOT NULL CHECK ([Type] IN (0,1,2,3)),
                  [Status] INTEGER NOT NULL CHECK ([Status] IN (0,1,2,3)),
                  [CreationDate] TEXT NOT NULL,
                  [StartDate] TEXT NOT NULL,
                  [EndDate] TEXT NOT NULL,
                  [CheckIn] TEXT NOT NULL,
                  [CheckOut] TEXT NOT NULL,
                  [DateChanged] TEXT NOT NULL,
                  FOREIGN KEY ([RoomID]) REFERENCES ROOMS(ID),
                  FOREIGN KEY ([GuestID]) REFERENCES GUESTS(ID),
                  FOREIGN KEY ([TransactionID]) REFERENCES TRANSACTIONS(ID));

                CREATE TABLE IF NOT EXISTS [guests] (
                  [ID] INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
                  [Fname] TEXT NOT NULL,
                  [Lname] TEXT NOT NULL,
                  [Email] TEXT NOT NULL UNIQUE,
                  [CreditCard] TEXT NULL UNIQUE,
                  [Expiration] TEXT NULL,
                  [CCV] TEXT NULL);
  
                CREATE TABLE IF NOT EXISTS [rooms] (
                  [ID] INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
                  [Occupied] BOOLEAN NOT NULL CHECK ([Occupied] IN (0,1)));

                CREATE TABLE IF NOT EXISTS [rates] (
                  [ID] INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
                  [Rate] INTEGER NOT NULL,
                  [DateSet] TEXT NOT NULL UNIQUE,
                  [DefaultRate] INTEGER NULL UNIQUE CHECK ([DefaultRate] IN (1)));";

            using (SQLiteCommand cmd = con.CreateCommand())
            {
                cmd.CommandText = tableCommands;
                cmd.ExecuteNonQuery();
            }
        }

        internal void InitializeRoomsTable()
        {
            using (SQLiteCommand cmd = con.CreateCommand())
            {
                for (int i = 1; i < 46; i++)
                {
                    cmd.CommandText = $"INSERT INTO ROOMS (Occupied) VALUES (0);";
                    cmd.ExecuteNonQuery();
                }
            }

            // Initialize Rooms

        }
        public void Dispose()
        {
            Close();
        }
    }

    internal static class DatabaseFunctions
    {

    }
    internal static class QueryBuilder
    {

        internal static string? UpdateTransaction(int Id,
            double? Rate = null, double? Owed = null, double? Penalty = null,
            double? Multiplier = null, double? Refund = null,
            DateTime? PayBy = null, DateTime? LastPaid = null, DateTime? PaidOn = null)
        {
            List<string> queryComponents = new List<string>();
            string query = "UPDATE transactions SET";

            if (Rate.HasValue)
                queryComponents.Add($"Rate = {Rate}");
            if (Owed.HasValue)
                queryComponents.Add($"Owed = {Owed}");
            if (Penalty.HasValue)
                queryComponents.Add($"Penalty = {Penalty}");
            if (Multiplier.HasValue)
                queryComponents.Add($"Multiplier = {Multiplier}");
            if (Refund.HasValue)
                queryComponents.Add($"Refund = {Refund}");
            if (PayBy.HasValue)
                queryComponents.Add($"PayBy = {PayBy.Value.Date.ToString("yyyy-MM-dd")}");
            if (LastPaid.HasValue)
                queryComponents.Add($"LastPaid = {LastPaid.Value.Date.ToString("yyyy-MM-dd")}");
            if (PaidOn.HasValue)
                queryComponents.Add($"PaidOn = {PaidOn.Value.Date.ToString("yyyy-MM-dd")}");

            if (queryComponents.Count > 0)
                query += " " + string.Join(", ", queryComponents) + " " + $"WHERE ID = {Id};";
            else
                return null;

            return query;
        }

        internal static string? UpdateReservation(int Id,
            int? RoomID = null, int? GuestID = null, int? TransactionID = null, bool? IsNoShow = null, ReservationType? Type = null,
            ReservationStatus? Status = null, DateTime? CreationDate = null, DateTime? StartDate = null, DateTime? EndDate = null,
            DateTime? CheckIn = null, DateTime? CheckOut = null, DateTime? DateChanged = null)
        {
            List<string> QueryParts = new List<string>();
            string query = "UPDATE reservations SET";

            if (RoomID.HasValue)
                QueryParts.Add($"RoomID = {RoomID}");
            if (GuestID.HasValue)
                QueryParts.Add($"GuestID = {GuestID}");
            if (TransactionID.HasValue)
                QueryParts.Add($"TransactionID = {TransactionID}");
            if (IsNoShow.HasValue)
                QueryParts.Add($"IsNoShow = {Convert.ToInt32(IsNoShow)}");
            if (Type.HasValue)
                QueryParts.Add($"Type = {(int)Type}");
            if (Status.HasValue)
                QueryParts.Add($"Status = {(int)Status}");
            if (CreationDate.HasValue)
                QueryParts.Add($"CreationDate = {CreationDate.Value.Date.ToString("yyyy-MM-dd")}");
            if (StartDate.HasValue)
                QueryParts.Add($"StartDate = {StartDate.Value.Date.ToString("yyyy-MM-dd")}");
            if (EndDate.HasValue)
                QueryParts.Add($"EndDate = {EndDate.Value.Date.ToString("yyyy-MM-dd")}");
            if (CheckIn.HasValue)
                QueryParts.Add($"CheckIn = {CheckIn.Value.Date.ToString("yyyy-MM-dd")}");
            if (CheckOut.HasValue)
                QueryParts.Add($"CheckOut = {CheckOut.Value.Date.ToString("yyyy-MM-dd")}");
            if (DateChanged.HasValue)
                QueryParts.Add($"DateChanged = {DateChanged.Value.Date.ToString("yyyy-MM-dd")}");

            if (QueryParts.Count > 0)
                query += " " + string.Join(", ", QueryParts) + " " + $"WHERE ID = {Id};";
            else
                return null;

            return query;
        }

        internal static string CreateTransaction(double Rate, double Owed,
            double Multiplier, DateTime PayBy, DateTime? LastPaid = null,
            DateTime? PaidOn = null, double Refund = 0, double Penalty = 0)
        {

            return @$"INSERT INTO transactions (Rate, Owed, Penalty, Multiplier, RefundAmount, PayBy, LastPaid, PaidOn)
                              VALUES ({Rate}, {Owed}, {Penalty}, {Multiplier}, {Refund}, {PayBy}, {PayBy}, {PaidOn});";
        }

        internal static string CreateReservation(int guestid, int transactionid, ReservationType type,
            ReservationStatus status, DateTime creationdate, DateTime startdate, DateTime enddate,
            DateTime? checkin = null, DateTime? checkout = null, DateTime? datechanged = null, bool? isnoshow = false)
        {
            return @$"INSERT INTO reservations (GuestID, TransactionID, IsNoShow, Type, Status, CreationDate, StartDate, EndDate, CheckIn, CheckOut, DateChanged)
                              VALUES ({guestid}, {transactionid}, {isnoshow}, {status}, {creationdate}, {startdate}, {enddate}, {checkin}, {checkout}, {datechanged});";
        }

        internal static string CreateGuest(string FirstName, string LastName, string Email, string? CreditCard, string? Expiration, string? CCV)
        {
            if (CreditCard != null && Expiration != null && CCV != null)
                return $@"INSERT INTO guests (Fname, Lname, Email, CreditCard, Expiration, CCV) VALUES ('{FirstName}', '{LastName}', '{Email}', '{CreditCard}', '{Expiration}', '{CCV}');";
            else
                return $@"INSERT INTO guests (Fname, Lname, Email) VALUES ('{FirstName}', '{LastName}', '{Email}');";
        }

        internal static string? UpdateGuest(int Id, string? FirstName = null, string? LastName = null, string? Email = null, string? CreditCard = null, string? Expiration = null, string? CCV = null)
        {
            List<string> QueryParts = new List<string>();
            string query = "UPDATE guests SET";

            if (!string.IsNullOrEmpty(FirstName))
                QueryParts.Add($"Fname = '{FirstName}'");
            if (!string.IsNullOrEmpty(LastName))
                QueryParts.Add($"Lname = '{LastName}'");
            if (!string.IsNullOrEmpty(LastName))
                QueryParts.Add($"Email = '{Email}'");
            if (!string.IsNullOrEmpty(CreditCard))
                QueryParts.Add($"CreditCard = '{CreditCard}'");
            if (!string.IsNullOrEmpty(Expiration))
                QueryParts.Add($"Expiration = '{Expiration}'");
            if (!string.IsNullOrEmpty(CCV))
                QueryParts.Add($"CCV = '{CCV}'");

            if (QueryParts.Count > 0)
                query += " " + string.Join(", ", QueryParts) + " " + $"WHERE ID = {Id};";
            else
                return null;

            return query;
        }
    }
}