Move logic out the the class libs

2026-07-30 10:11:54 +02:00
parent 97688542fe
commit 6df185d519
21 changed files with 44 additions and 99 deletions
--- a/PointOfSale/Pos.Service/SalesTransactionService.cs
+++ b/PointOfSale/Pos.Service/SalesTransactionService.cs
@@ -0,0 +1,171 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Pos.Models;
+
+namespace Pos.Service
+{
+    /// <summary>
+    /// Holder styr på den igangværende handel og dens beregninger.
+    /// Servicen har ingen afhængighed til WPF eller web.
+    /// </summary>
+    public class SalesTransactionService
+    {
+        private readonly List<PriceLineModel> _saleLines = new List<PriceLineModel>();
+        private readonly List<AmountGridModel> _payments = new List<AmountGridModel>();
+
+        public IReadOnlyList<PriceLineModel> SaleLines => _saleLines;
+        public IReadOnlyList<AmountGridModel> Payments => _payments;
+
+        public decimal TotalPrice =>
+            _saleLines.Sum(line =>
+                CalculateLineTotal(line.Price, line.NumberProducts));
+
+        public decimal AmountPaid =>
+            _payments.Sum(payment => payment.Amount);
+
+        public decimal RemainingAmount =>
+            Math.Max(TotalPrice - AmountPaid, 0);
+
+        public decimal Change =>
+            Math.Max(AmountPaid - TotalPrice, 0);
+
+        public bool IsFullyPaid =>
+            TotalPrice > 0 && AmountPaid >= TotalPrice;
+
+        /// <summary>
+        /// Beregner totalen for en enkelt salgslinje.
+        /// Parsing og visning af resultatet er fortsat UI-ansvar.
+        /// </summary>
+        public decimal CalculateLineTotal(decimal price, int numberOfProducts)
+        {
+            ValidatePriceAndQuantity(price, numberOfProducts);
+            return price * numberOfProducts;
+        }
+
+        public PriceLineModel AddSaleLine(
+            int id,
+            string name,
+            int numberOfProducts,
+            decimal price,
+            bool isProductGroup)
+        {
+            if (id <= 0)
+                throw new ArgumentOutOfRangeException(
+                    nameof(id),
+                    "Id skal være større end 0.");
+
+            if (string.IsNullOrWhiteSpace(name))
+                throw new ArgumentException(
+                    "Navn skal være udfyldt.",
+                    nameof(name));
+
+            ValidatePriceAndQuantity(price, numberOfProducts);
+
+            PriceLineModel saleLine = new PriceLineModel
+            {
+                Id = id,
+                Name = name,
+                NumberProducts = numberOfProducts,
+                Price = price,
+                IsProductGroup = isProductGroup
+            };
+
+            _saleLines.Add(saleLine);
+            return saleLine;
+        }
+
+        public void RemoveSaleLineAt(int index)
+        {
+            if (index < 0 || index >= _saleLines.Count)
+                throw new ArgumentOutOfRangeException(nameof(index));
+
+            _saleLines.RemoveAt(index);
+        }
+
+        /// <summary>
+        /// Registrerer en betaling. Hvis amount er null, betales restbeløbet.
+        /// </summary>
+        public AmountGridModel AddPayment(
+            PaymentMethod paymentMethod,
+            decimal? amount = null)
+        {
+            if (_saleLines.Count == 0)
+                throw new InvalidOperationException(
+                    "Der kan ikke registreres betaling på et tomt salg.");
+
+            decimal paymentAmount = amount ?? RemainingAmount;
+
+            if (paymentAmount <= 0)
+                throw new ArgumentOutOfRangeException(
+                    nameof(amount),
+                    "Betalingsbeløbet skal være større end 0.");
+
+            AmountGridModel payment = new AmountGridModel
+            {
+                Amount = paymentAmount,
+                PaymentMethodText = GetPaymentMethodText(paymentMethod)
+            };
+
+            _payments.Add(payment);
+            return payment;
+        }
+
+        public void RemovePaymentAt(int index)
+        {
+            if (index < 0 || index >= _payments.Count)
+                throw new ArgumentOutOfRangeException(nameof(index));
+
+            _payments.RemoveAt(index);
+        }
+
+        public void EnsureCanComplete()
+        {
+            if (_saleLines.Count == 0)
+                throw new InvalidOperationException(
+                    "Et tomt salg kan ikke afsluttes.");
+
+            if (!IsFullyPaid)
+                throw new InvalidOperationException(
+                    "Salget er ikke fuldt betalt.");
+        }
+
+        public void Reset()
+        {
+            _saleLines.Clear();
+            _payments.Clear();
+        }
+
+        private static void ValidatePriceAndQuantity(
+            decimal price,
+            int numberOfProducts)
+        {
+            if (price < 0)
+                throw new ArgumentOutOfRangeException(
+                    nameof(price),
+                    "Prisen må ikke være negativ.");
+
+            if (numberOfProducts <= 0)
+                throw new ArgumentOutOfRangeException(
+                    nameof(numberOfProducts),
+                    "Antal skal være større end 0.");
+        }
+
+        private static string GetPaymentMethodText(PaymentMethod paymentMethod)
+        {
+            switch (paymentMethod)
+            {
+                case PaymentMethod.Card:
+                    return "Kort";
+                case PaymentMethod.Cash:
+                    return "Kontant";
+                case PaymentMethod.GiftCard:
+                    return "Gavekort";
+                case PaymentMethod.MobilePay:
+                    return "MobilePay";
+                default:
+                    throw new ArgumentOutOfRangeException(nameof(paymentMethod));
+            }
+        }
+    }
+}