Setup CSV Fleet import and EF Fleet Entity, fix a few bugs

Stars Assistant/CSV/FleetLoader.cs

@@ -0,0 +1,77 @@
+using System;
+using System.Diagnostics.CodeAnalysis;
+using CsvHelper.Configuration;
+using CsvHelper;
+using System.Globalization;
+using Splat;
+using StarsAssistant.Services;
+using Avalonia.Animation;
+
+namespace StarsAssistant.CSV;
+
+public class FleetLoader
+{
+    /// <summary>
+    /// Reference to the game metadata, retrieved by DI
+    /// </summary>
+    protected Services.Game Game = Locator.Current.GetService<Services.Game>()!;
+
+    /// <summary>
+    /// CSV Configuration to use for importing Planet files.
+    /// </summary>
+    protected CsvConfiguration CsvConfig;
+
+    /// <summary>
+    /// Construction
+    /// </summary>
+    public FleetLoader()
+    {
+        CreateConfig();
+    }
+
+    /// <summary>
+    /// Creates the CSV configuration for planets.
+    /// </summary>
+    [MemberNotNull(nameof(CsvConfig))]
+    protected void CreateConfig() 
+    {
+        CsvConfig = CsvConfiguration.FromAttributes<Fleet>(CultureInfo.InvariantCulture);
+        CsvConfig.Delimiter = "\t";
+        CsvConfig.Escape = '\0';
+        CsvConfig.MissingFieldFound = null;
+    }
+
+    /// <summary>
+    /// Import the fleet file for the given Race, all other records will be ignored.
+    /// Since we can't update existing records, we will delete all applicable ones
+    /// before inserting new Fleets.
+    /// </summary>
+    /// <param name="race">Import File</param>
+    public void ImportForRace(Model.Race race)
+    {
+        using var db = Locator.Current.GetService<Model.StarsDatabase>()!;
+        using var reader = new StreamReader(Game.FleetFileForRace(race), System.Text.Encoding.Latin1);
+        using var csv = new CsvReader(reader, CsvConfig);
+
+        var oldFleetsToDelete = from flt in db.Fleet
+            where flt.OwnerFileId == race.PlayerFileId
+            select flt;
+        db.RemoveRange(oldFleetsToDelete);
+
+        List<CSV.Fleet> records = csv.GetRecords<Fleet>().ToList();
+        var fleetsForPlayer = from flt in records
+            where flt.OwnerFileId == race.PlayerFileId
+            select flt;
+
+        foreach (var csvFleet in fleetsForPlayer)
+        {
+            Model.Fleet dbFleet = new();
+            csvFleet.UpdateDbFleet(dbFleet);
+            dbFleet.OwnerId = race.Name;
+            db.Add(dbFleet);
+        }
+
+        db.SaveChanges();
+    }
+
+}