using System;
using System.Collections.Generic;
using System.Linq;
using Ophelias.Managers;
using System.Data.SQLite;

namespace Ophelias.Models
{
    internal class Reservation
    {
        internal int Id;
        internal int? RoomNum;
        internal Guest Guest;
        internal Transaction Transaction;

        internal bool IsNoShow;

        internal ReservationType Type;
        internal ReservationStatus Status;

        internal DateTime CreationDate;
        internal DateTime StartDate;
        internal DateTime EndDate;

        internal DateTime? CheckIn;
        internal DateTime? CheckOut;
        internal DateTime? DateChanged;

        internal Reservation(Guest Guest, ReservationType Type,
            DateTime CreationDate, DateTime StartDate, DateTime EndDate, ReservationStatus Status = ReservationStatus.Active,
            bool IsNoShow = false, DateTime? CheckIn = null, DateTime? CheckOut = null, DateTime? DateChanged = null, int? RoomNum = null)
        {
            int Id; double Multiplier;
            switch (Type)
            {
                case ReservationType.Conventional: Multiplier = TxFunctions.ConventionalFee; break;
                case ReservationType.Prepaid: Multiplier = TxFunctions.PrepaidFee; break;
                case ReservationType.Incentive: Multiplier = TxFunctions.IncentiveFee(StartDate, EndDate); break;
                case ReservationType.SixtyDayAdvance: Multiplier = TxFunctions.SixtyDayFee; break;
                default: throw new NotImplementedException();
            }
            double? BaseRate = HotelManager.GetBaseRate();
            if (BaseRate == null) { 
                throw new NotImplementedException();
            }

            Transaction Transaction = new Transaction(
                Rate: (double)BaseRate,
                Owed: TxFunctions.CalculateOwed((double)BaseRate, (int)(EndDate.Date - StartDate.Date).TotalDays),
                Multiplier: Multiplier,
                PayBy: TxFunctions.GetPayByDate(Type, StartDate, EndDate)
            );
            using (DatabaseManager Manager = new DatabaseManager())
            {
                using (SQLiteCommand cmd = Manager.con.CreateCommand())
                {
                    if (RoomNum != null)
                        this.RoomNum = RoomNum;
                    cmd.CommandText =
                        "INSERT INTO reservations (RoomNum, GuestID, TransactionID, IsNoShow, Type, Status, CreationDate, StartDate, EndDate, CheckIn, CheckOut, DateChanged) " +
                        "VALUES (@RoomNum, @GuestID, @TransactionID, @IsNoShow, @Type, @Status, @CreationDate, @StartDate, @EndDate, @CheckIn, @CheckOut, @DateChanged);";
                    cmd.Parameters.AddWithValue("@RoomNum", RoomNum);
                    cmd.Parameters.AddWithValue("@GuestID", Guest.Id);
                    cmd.Parameters.AddWithValue("@TransactionID", Transaction.Id);
                    cmd.Parameters.AddWithValue("@IsNoShow", Convert.ToInt32(IsNoShow));
                    cmd.Parameters.AddWithValue("@Type", (int)Type);
                    cmd.Parameters.AddWithValue("@Status", (int)Status);
                    cmd.Parameters.AddWithValue("@CreationDate", CreationDate.ToString("yyyy-MM-dd"));
                    cmd.Parameters.AddWithValue("@StartDate", StartDate.ToString("yyyy-MM-dd"));
                    cmd.Parameters.AddWithValue("@EndDate", EndDate.ToString("yyyy-MM-dd"));
                    if (CheckIn.HasValue)
                        cmd.Parameters.AddWithValue("@CheckIn", CheckIn.Value.ToString("yyyy-MM-dd"));
                    else
                        cmd.Parameters.AddWithValue("@CheckIn", CheckIn);
                    if (CheckOut.HasValue)
                        cmd.Parameters.AddWithValue("@CheckOut", CheckOut.Value.ToString("yyyy-MM-dd"));
                    else
                        cmd.Parameters.AddWithValue("@CheckOut", CheckOut);
                    if (DateChanged.HasValue)
                        cmd.Parameters.AddWithValue("@DateChanged", DateChanged.Value.ToString("yyyy-MM-dd"));
                    else
                        cmd.Parameters.AddWithValue("@DateChanged", DateChanged);

                    cmd.ExecuteNonQuery();
                }
                Id = (int)Manager.con.LastInsertRowId;
            }
            this.Id = Id;
            this.RoomNum = RoomNum;
            this.Guest = Guest;
            this.Transaction = Transaction;
            this.IsNoShow = IsNoShow;
            this.Type = Type;
            this.Status = Status;
            this.CreationDate = CreationDate;
            this.StartDate = StartDate;
            this.EndDate = EndDate;
            this.CheckIn = CheckIn;
            this.CheckOut = CheckOut;
            this.DateChanged = DateChanged;
        }
        internal Reservation(int Id, Guest Guest, Transaction Transaction, ReservationType Type, ReservationStatus Status, 
            DateTime CreationDate, DateTime StartDate, DateTime EndDate, bool IsNoShow = false, DateTime? CheckIn = null, DateTime? CheckOut = null, DateTime? DateChanged = null, int? RoomNum = null)
        {
            this.Id = Id;
            this.RoomNum = RoomNum;
            this.Guest = Guest;
            this.Transaction = Transaction;
            this.IsNoShow = IsNoShow;
            this.Type = Type;
            this.Status = Status;
            this.CreationDate = CreationDate;
            this.StartDate = StartDate;
            this.EndDate = EndDate;
            this.CheckIn = CheckIn;
            this.CheckOut = CheckOut;
            this.DateChanged = DateChanged;
        }
        internal void ChangeReservationDates(DateTime StartDate, DateTime EndDate)
        {
            this.StartDate = StartDate;
            this.EndDate = EndDate;
            DateChanged = DateTime.Now.Date;
            using (DatabaseManager Manager = new DatabaseManager())
            {
                using (SQLiteCommand cmd = Manager.con.CreateCommand())
                {
                    string? query = QueryBuilder.UpdateReservation(Id: Id, Status: ReservationStatus.Changed, StartDate: this.StartDate, EndDate: this.EndDate, DateChanged: DateChanged);

                    if (query == null)
                        throw new Exception();

                    cmd.CommandText = query;
                    cmd.Parameters.AddWithValue("@ID", Id);
                    cmd.Parameters.AddWithValue("@Status", Status);
                    cmd.Parameters.AddWithValue("@StartDate", StartDate.ToString("yyyy-MM-dd"));
                    cmd.Parameters.AddWithValue("@EndDate", EndDate.ToString("yyyy-MM-dd"));
                    cmd.Parameters.AddWithValue("@DateChanged", DateChanged.Value.ToString("yyyy-MM-dd"));
                    cmd.ExecuteNonQuery();
                }
            }
            double? BaseRate = HotelManager.GetBaseRate();
            if (BaseRate == null)
                throw new ArgumentNullException(nameof(BaseRate));
            Transaction.UpdateTransactionFees((double)BaseRate, TxFunctions.Changed, TxFunctions.GetPayByDate(Type, this.StartDate, this.EndDate));
        }
        internal void CancelReservation()
        {
            DateTime _DateChanged = DateTime.Now.Date;
            using (DatabaseManager Manager = new DatabaseManager())
            {
                using (SQLiteCommand cmd = Manager.con.CreateCommand())
                {
                    string? query = QueryBuilder.UpdateReservation(Id: Id, Status: ReservationStatus.Cancelled, DateChanged: _DateChanged);

                    if (query == null)
                        throw new Exception();

                    Status = ReservationStatus.Cancelled;
                    DateChanged = _DateChanged;

                    cmd.CommandText = query;
                    cmd.Parameters.AddWithValue("@ID", Id);
                    cmd.Parameters.AddWithValue("@Status", Status);
                    cmd.Parameters.AddWithValue("@DateChanged", DateChanged.Value.ToString("yyyy-MM-dd"));
                    cmd.ExecuteNonQuery();
                }
            }
        }
    }
    internal enum ReservationStatus
    {
        Active,
        Changed,
        Cancelled,
        Ended,
    }
    internal enum ReservationType
    {
        Conventional,
        Prepaid,
        Incentive,
        SixtyDayAdvance,
    }
}