Basic archive funcionality and page

PizzaBot/Services/ArchiveService.cs

@@ -0,0 +1,98 @@
+using PizzaBot.Models;
+using System.Security.Cryptography;
+
+namespace PizzaBot.Services
+{
+    using PizzaArchiveType = List<PizzaArchiveEntry>;
+
+    public struct PizzaArchiveEntry
+    {
+        // id should be a random number
+        public int id { get; set; }
+        public DateTime date { get; set; }
+        public int MeatPizzas { get; set; }
+        public int VeggiePizzas { get; set; }
+        public int VeganPizzas { get; set; }
+        public float TotalCost { get; set; }
+        public int Bottles { get; set; }
+        public List<AnonymizedOrder> AnonymizedOrders { get; set; }
+        public PenaltyType PenaltyType { get; set; }
+        public string Annotation { get; set; }
+
+        public struct AnonymizedOrder
+        {
+            public int requestedMeatPieces { get; set; }
+            public int requestedVeggiePieces { get; set; }
+            public int requestedVeganPieces { get; set; }
+        }
+    }
+    public class ArchiveService
+    {
+        JSONService _jsonService;
+        PizzaArchiveType _pizzaArchive;
+        Random _rng;
+
+        public ArchiveService(JSONService jSONService)
+        {
+            _rng = new Random();
+
+            _jsonService = jSONService;
+            PizzaArchiveType? loaded = _jsonService.GetPizzaArchive();
+            _pizzaArchive = loaded == null ? new PizzaArchiveType() : loaded;
+            SortArchive();
+        }
+
+        public PizzaArchiveType GetLatestNEntries(int n, int startPoint = 0)
+        {
+            return _pizzaArchive.Skip(startPoint).Take(n).ToList();
+        }
+
+        public PizzaArchiveType GetAllEntries()
+        {
+            PizzaArchiveType copy = _pizzaArchive;
+            PizzaArchiveType? loaded = _jsonService.GetPizzaArchive();
+            _pizzaArchive = loaded == null ? new PizzaArchiveType() : loaded;
+            return copy;
+        }
+
+        /// <summary>
+        /// Adds an entry to the archive
+        /// </summary>
+        /// <param name="entry">the data to add</param>
+        /// <returns>true, if sucessfull, false otherwise</returns>
+        public bool AddEntry(PizzaArchiveEntry entry)
+        {
+            if (_pizzaArchive == null)
+            {
+                return false;
+            }
+
+            entry.id = _rng.Next();
+            _pizzaArchive.Add(entry);
+            SortArchive();
+            _jsonService.WriteNewPizzaArchive(_pizzaArchive);
+            return true;
+        }
+
+        public bool RemoveEntry(PizzaArchiveEntry entry)
+        {
+            return _pizzaArchive.Remove(entry);
+        }
+
+        public bool RemoveEntry(int id)
+        {
+            int index = _pizzaArchive.FindIndex((PizzaArchiveEntry o) => { return o.id == id; });
+            if (index == -1)
+            {
+                return false;
+            }
+            _pizzaArchive.RemoveAt(index);
+            return true;
+        }
+
+        private void SortArchive()
+        {
+            _pizzaArchive.OrderByDescending(o => o.date);
+        }
+    }
+}