using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Ophelias.Models;
using Ophelias.Managers;

namespace Ophelias.Models
{
    internal class Transaction
    {
        private double PenaltyMultipler = 1.1;

        internal int Id { get; set; }
        internal double Rate { get; set; }
        internal double Paid { get; set; }
        internal double Owed { get; set; }
        internal double? Penalty { get; set; }
        internal double Multiplier { get; set; }
        internal double RefundAmount { get; set; }
        internal bool? Late { get; set; }
        internal bool PaidOff { get; set; }
        internal DateTime PayBy { get; set; }
        internal DateTime PaidOn { get; set; }

        internal Transaction(int id, Reservation r, DateTime payby)
        {
            Id = id;
            Paid = 0;
            Owed = 0;
            RefundAmount = 0;
            PaidOff = false;
            PayBy = SetPayByDate(r);
            Multiplier = Fee(r.Type);
        }
        private bool IsOverdue()
        {
            if  (DateTime.Now > PayBy)
            {
                return true;
            }
            return false;
        }
        private DateTime SetPayByDate(Reservation r)
        {
            switch(r.Type)
            {
                case ReservationType.Conventional: return r.EndDate;
                case ReservationType.Prepaid: return r.StartDate;
                case ReservationType.Incentive: return r.EndDate;
                case ReservationType.SixtyDayAdvance: return r.StartDate.AddDays(-30);
                default: throw new NotImplementedException();
            }
        }
        private void SetChangeFees(ReservationType type, double rate)
        {
            switch (type)
            {
                case ReservationType.Conventional: return;
                case ReservationType.Prepaid: SetFee(PenaltyMultipler); SetRate(rate); return;
                case ReservationType.Incentive: return;
                case ReservationType.SixtyDayAdvance: SetFee(PenaltyMultipler); SetRate(rate); return;
                default: throw new NotImplementedException();
            }
        }
        private void CancellationHandler(ReservationType type)
        {
            void SetRefund()
            {
                if (DateTime.Now.AddDays(+3).Day <= PayBy.Day)
                {
                    RefundAmount = Paid;
                    Paid = 0;
                    Owed = 0;
                    PaidOff = false;
                }
            }

            switch (type)
            {
                case ReservationType.Conventional: SetRefund(); return;
                case ReservationType.Prepaid: return;
                case ReservationType.Incentive: SetRefund(); return;
                case ReservationType.SixtyDayAdvance: return;
                default: throw new NotImplementedException();
            }
        }
        internal void Penalize(Reservation r)
        {
            switch (r.Status)
            {
                case ReservationStatus.Active: IsOverdue(); return;
                case ReservationStatus.Ended: IsOverdue(); return;
                case ReservationStatus.Cancelled: CancellationHandler(r.Type); return;
                default: throw new NotImplementedException();
            }
        }
        internal void Penalize(Reservation r, double rate)
        {
            switch(r.Status)
            {
                case ReservationStatus.Changed: SetChangeFees(r.Type, rate); return;
                default: throw new NotImplementedException();
            }
        }
        private double Fee(ReservationType type)
        {
            switch (type)
            {
                case ReservationType.Conventional: return 1.0;
                case ReservationType.Prepaid: return 0.75;
                case ReservationType.Incentive: return GetIncentiveRate();
                case ReservationType.SixtyDayAdvance: return 0.85;
                default: throw new NotImplementedException();
            }
        }
        private double GetIncentiveRate()
        {
            return 0.80;
        }
        private void SetFee(double mult)
        {
            Multiplier = mult;
        }
        private void SetRate(double rate)
        {
            Rate = rate;
        }

        internal void Pay(double amount)
        {
            if (RefundAmount > -1)
            {
                return;
            }
            Paid += amount;
            if (Paid == Owed)
            {
                Owed -= Paid;
                PaidOn = DateTime.Now;
                PaidOff = true;
            } else if (Paid > Owed)
            {
                RefundAmount = Paid - Owed;
                Owed = Owed - Paid + RefundAmount;
                PaidOn = DateTime.Now;
                PaidOff = true;
            } else
            {
                Owed -= Paid;
                PaidOn = DateTime.Now;
            }
        }
    }

    internal static class TransactionFees
    {
        static double ConventionalFee = 1.0;
        static double PrepaidFee = 0.75;
        static double IncentiveFee = OccupancyIncentive();
        static double SixtyDayFee = 0.85;

        private static double OccupancyIncentive()
        {
            int thirtyDayOcc;
            using (DatabaseManager dbm = new DatabaseManager())
            {
                if (dbm.cur == null)
                    throw new NotImplementedException();

                thirtyDayOcc = DatabaseFunctions.GetThirtyDayOccupancy(dbm.cur, DateTime.Now);
            }
            if ((double)(thirtyDayOcc / 45.0) <= 0.6)
                return 0.80;
            return 1.0;
        }

    }
    internal class TransactionList
    {
        internal List<Transaction> Transactions;

        internal TransactionList()
        {
            Transactions = new List<Transaction>();
        }
    }
}