Added preferences backend (#465)

* Added preferences backend

* Gender -> Sex

* ClientPreferencesManager properties

* Username validation

* Fixed client init

* WIP db

* Actually working sqlite db

* Dropped shitty sqlite libraries, dropped DbUp, added MigrationManager

* Added profile deletion, test

* Docs, sanity, tests, cleanup

* Cleaned up profile and appearance, fixed running on .net core

Co-authored-by: Pieter-Jan Briers <pieterjan.briers@gmail.com>

Content.Tests/Server/Preferences/PreferencesDatabaseTests.cs

@@ -0,0 +1,101 @@
+using System.IO;
+using Content.Server.Preferences;
+using Content.Shared.Preferences;
+using NUnit.Framework;
+using Robust.Shared.Maths;
+using Robust.UnitTesting;
+
+namespace Content.Tests.Server.Preferences
+{
+    [TestFixture]
+    public class PreferencesDatabaseTests : RobustUnitTest
+    {
+        private const int MaxCharacterSlots = 10;
+
+        private static ICharacterProfile CharlieCharlieson()
+        {
+            return new HumanoidCharacterProfile
+            {
+                Name = "Charlie Charlieson",
+                Age = 21,
+                Sex = Sex.Male,
+                CharacterAppearance = new HumanoidCharacterAppearance()
+                {
+                    HairStyleName = "Afro",
+                    HairColor = Color.Aqua,
+                    FacialHairStyleName = "Shaved",
+                    FacialHairColor = Color.Aquamarine,
+                    EyeColor = Color.Azure,
+                    SkinColor = Color.Beige
+                }
+            };
+        }
+
+        private static PreferencesDatabase GetDb()
+        {
+            return new PreferencesDatabase(Path.GetTempFileName(), MaxCharacterSlots);
+        }
+
+        [Test]
+        public void TestUserDoesNotExist()
+        {
+            var db = GetDb();
+            Assert.Null(db.GetPlayerPreferences("[The database should be empty so any string should do]"));
+        }
+
+        [Test]
+        public void TestUserDoesExist()
+        {
+            var db = GetDb();
+            const string username = "bobby";
+            db.SaveSelectedCharacterIndex(username, 0);
+            var prefs = db.GetPlayerPreferences(username);
+            Assert.NotNull(prefs);
+            Assert.Zero(prefs.SelectedCharacterIndex);
+            Assert.That(prefs.Characters.TrueForAll(character => character is null));
+        }
+
+        [Test]
+        public void TestUpdateCharacter()
+        {
+            var db = GetDb();
+            const string username = "charlie";
+            const int slot = 0;
+            var originalProfile = CharlieCharlieson();
+            db.SaveSelectedCharacterIndex(username, slot);
+            db.SaveCharacterSlot(username, originalProfile, slot);
+            var prefs = db.GetPlayerPreferences(username);
+            Assert.That(prefs.Characters[slot].MemberwiseEquals(originalProfile));
+        }
+
+        [Test]
+        public void TestDeleteCharacter()
+        {
+            var db = GetDb();
+            const string username = "charlie";
+            const int slot = 0;
+            db.SaveSelectedCharacterIndex(username, slot);
+            db.SaveCharacterSlot(username, CharlieCharlieson(), slot);
+            db.SaveCharacterSlot(username, null, slot);
+            var prefs = db.GetPlayerPreferences(username);
+            Assert.That(prefs.Characters.TrueForAll(character => character is null));
+        }
+
+        [Test]
+        public void TestInvalidSlot()
+        {
+            var db = GetDb();
+            const string username = "charlie";
+            const int slot = -1;
+
+            db.SaveSelectedCharacterIndex(username, slot);
+            db.SaveCharacterSlot(username, CharlieCharlieson(), slot);
+            var prefs = db.GetPlayerPreferences(username);
+            Assert.AreEqual(prefs.SelectedCharacterIndex, 0);
+
+            db.SaveSelectedCharacterIndex(username, MaxCharacterSlots);
+            prefs = db.GetPlayerPreferences(username);
+            Assert.AreEqual(prefs.SelectedCharacterIndex, MaxCharacterSlots-1);
+        }
+    }
+}