todo stage1

MySolution/ToDoApp/Service/UserService.cs

@@ -0,0 +1,109 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using ToDoApp.Context;
+using ToDoApp.Model;
+using ToDoApp.Utility;
+
+namespace ToDoApp.Service
+{
+    public class UserService
+    {
+        public static UserService Instance { get; set; } = new UserService();
+
+        public User? FindUser(int userId)
+        {
+            using (var context = new ToDoContext())
+            {
+                return context.Users.Find(userId);
+            }
+        }
+
+        public User? FindUser(string username)
+        {
+            using (var context = new ToDoContext())
+            {
+                return context.Users.FirstOrDefault(u => u.Name == username);
+            }
+        }
+
+        public bool CheckUserLogin(string username, string password)
+        {
+            User? user = FindUser(username);
+            if (user == null)
+                return false;
+
+            return Utils.VerifyPassword(password, user.Password);
+        }
+
+        public void CreateUser(User user)
+        {
+            using (var context = new ToDoContext())
+            {
+                user.Password = Utils.HashPassword(user.Password);
+                user.CreateDate = DateTime.Now;
+                context.Users.Add(user);
+                context.SaveChanges();
+            }
+        }
+
+        public void DisableUser(int userId)
+        {
+            using (var context = new ToDoContext())
+            {
+                User? user = context.Users.Find(userId);
+                if (user == null)
+                    return;
+
+                user.Status = UserStatus.Invalid;
+                context.SaveChanges();
+            }
+        }
+
+        public void DisableUser(string username)
+        {
+            using (var context = new ToDoContext())
+            {
+                User? user = context.Users.FirstOrDefault(u => u.Name == username);
+                if (user == null)
+                    return;
+
+                user.Status = UserStatus.Invalid;
+                context.SaveChanges();
+            }
+        }
+
+        public void RemoveUser(int userId)
+        {
+            using (var context = new ToDoContext())
+            {
+                User? user = context.Users.Find(userId);
+                if (user == null)
+                    return;
+
+                context.Users.Remove(user);
+                context.SaveChanges();
+            }
+        }
+
+        public void RemoveUser(string username)
+        {
+            using (var context = new ToDoContext())
+            {
+                User? user = context.Users.FirstOrDefault(u => u.Name == username);
+                if (user == null)
+                    return;
+
+                context.Users.Remove(user);
+                context.SaveChanges();
+            }
+        }
+
+        public void RemoveUser(User user)
+        {
+            RemoveUser(user.Id);
+        }
+    }
+}