DB added and more

TOOHUCardAPI/Data/Repositories/UserRepository.cs

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+using System;
+using System.Linq;
+using AutoMapper;
+using TOOHUCardAPI.Data.Models;
+
+namespace TOOHUCardAPI.Data.Repositories
+{
+    public class UserRepository
+    {
+        private readonly AppDbContext _appDbContext;
+        private readonly IMapper _mapper;
+
+        public UserRepository(AppDbContext appDbContext, IMapper mapper)
+        {
+            _appDbContext = appDbContext;
+            _mapper = mapper;
+        }
+
+        public User GetUser(string steamId)
+        {
+            return _appDbContext.Users.Where((user => user.SteamId.Equals(steamId))).FirstOrDefault();
+        }
+
+        public User CreateUser(string steamId)
+        {
+            User user = new User()
+            {
+                SteamId = steamId,
+                Vip = true,
+                EndTime = DateTime.MaxValue,
+                LevelList = string.Empty,
+                PetLevel = 1
+            };
+            _appDbContext.Users.Add(user);
+            _appDbContext.SaveChanges();
+            return user;
+        }
+
+        public User UpdateUser(User user)
+        {
+            var trackedUser = _appDbContext.Users.FirstOrDefault(u => u.SteamId == user.SteamId);
+            if (trackedUser == default)
+            {
+                return trackedUser;
+            }
+
+            _appDbContext.Update(user);
+            _appDbContext.SaveChanges();
+            return user;
+        }
+
+        public User GetOrCreateUser(string steamId)
+        {
+            User user = GetUser(steamId) ?? CreateUser(steamId);
+            return user;
+        }
+    }
+}