234 users

app/DbContext.cs

@@ -1,6 +1,7 @@
 using Microsoft.EntityFrameworkCore;
 
 using Lms.Models;
+using lms.models;
 
 namespace Lms;
 
@@ -22,6 +23,8 @@ public class LmsDbContext : Microsoft.EntityFrameworkCore.DbContext
 {
 
     // DB Sets (Tables in Database)
+
+    public DbSet<User> Users { get; set; } 
     public DbSet<Models.Progress> Progresses { get; set; }
     public DbSet<Models.WorkItem> WorkItems { get; set; }
     public DbSet<Block> Blockers { get; set; }

app/Program.cs

@@ -1,6 +1,7 @@
 using System.Dynamic;
 using Lms;
 
+// Initialize the parser
 CommandLineParser parser = new CommandLineParser();
 
 ((Noun noun, Verb verb), string[] commandArgs) = parser.ParseWithArgs(args);
@@ -22,6 +23,9 @@
 // Initialize DBContext
 var dbContext = new LmsDbContext();
 
+// Initialize UserManager
+var userManager = new UserManager();
+
 switch (noun)
 {
     case Noun.Invalid:

app/UserManager.cs

@@ -0,0 +1,57 @@
+using lms.models;
+
+
+public class UserManager
+{
+    // Properties
+    private const string DELIMITER = "|";
+    private const string ActiveUserFilePath = "activeUser.txt"; // Path to Active User File
+    public User? ActiveUser { get; set; }  // Active User
+
+    public UserManager()
+    {
+        // Create Active User File if not exists
+        if (!File.Exists(ActiveUserFilePath))
+        {
+            File.Create(ActiveUserFilePath);
+        }
+        else
+        {
+            FetchActiveUser();
+        }
+    }
+
+    // Get Active User from File 
+    public void FetchActiveUser()
+    {
+        using(StreamReader sr = new StreamReader(ActiveUserFilePath))
+        {
+            string userString = sr.ReadLine();
+            ActiveUser = ParseUser(userString);
+        }
+    }
+
+    // Update/Change Active User (Store Active User to the File)
+    public void UpdateActiveUser(User user)
+    {
+        ActiveUser = user;
+        using (StreamWriter sw = new StreamWriter(ActiveUserFilePath, false))   // Overwrites the file
+        {
+            sw.WriteLine(ComposeUser(user));
+        }
+    }
+
+    // Compose User
+    public string ComposeUser(User user)
+    {
+        return $"{user.Id}{DELIMITER}{user.Username}";
+    }
+
+    // Parse User
+    public User ParseUser(string userString)
+    {
+        string[] userProps = userString.Split(DELIMITER);
+        return new User { Id = int.Parse(userProps[0]), Username = userProps[1] };
+    }
+}
+

app/models/User.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace lms.models
+{
+    public class User
+    {
+        // Fields
+        public int Id { get; set; }
+        public string Username { get; set; }
+    }
+}