using Elwig.Models;
using System;
using System.Collections.Generic;
using System.Linq;

namespace Elwig.Helpers.Billing {
    public class Transaction {

        public readonly Member Member;
        public readonly long AmountCent;
        public readonly string Currency;
        public readonly int Nr;

        public Transaction(Member m, decimal amount, string currency, int nr) {
            Member = m;
            AmountCent = (long)Math.Round(amount * 100);
            Currency = currency;
            Nr = nr;
        }

        public static IEnumerable<Transaction> FromPaymentVariant(PaymentVar variant) {
            var last = variant.Season.PaymentVariants.Where(v => v.TransferDate != null).OrderBy(v => v.TransferDate).LastOrDefault();
            var dict = last?.MemberPayments.ToDictionary(m => m.MgNr, m => m.Amount) ?? new();
            return variant.Credits
                .OrderBy(c => c.MgNr)
                .Select(c => new Transaction(c.Member, c.Amount, variant.Season.CurrencyCode, c.TgNr))
                .ToList();
        }

        public static string FormatAmountCent(long cents) => $"{cents / 100}.{cents % 100:00}";
    }
}