added leaderboard controller and for adding/updating the score

SwipeWords/Controllers/LeaderboardController.cs

@@ -0,0 +1,73 @@
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+using SwipeWords.Data;
+using System;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace SwipeWords.Controllers
+{
+    [ApiController]
+    [Route("api/[controller]")]
+    public class LeaderboardController : ControllerBase
+    {
+        private readonly UsersDatabaseContext _context;
+
+        public LeaderboardController(UsersDatabaseContext context)
+        {
+            _context = context;
+        }
+
+        [HttpPost("AddOrUpdateScore")]
+        public async Task<IActionResult> AddOrUpdateScore(string userName, int score)
+        {
+            var leaderboardEntry = await _context.Leaderboards
+                .FirstOrDefaultAsync(lb => lb.UserName == userName);
+
+            if (leaderboardEntry != null)
+            {
+                if (score > leaderboardEntry.MaxScore)
+                {
+                    leaderboardEntry.MaxScore = score;
+                    await _context.SaveChangesAsync();
+                }
+            }
+            else
+            {
+                var user = await _context.Users.FirstOrDefaultAsync(u => u.Name == userName);
+                if (user == null)
+                {
+                    return NotFound(new { message = "User not found." });
+                }
+
+                leaderboardEntry = new Leaderboard
+                {
+                    UserName = userName,
+                    UserId = user.UserId,
+                    MaxScore = score
+                };
+
+                _context.Leaderboards.Add(leaderboardEntry);
+                await _context.SaveChangesAsync();
+            }
+
+            return Ok(new { message = "Score added or updated successfully." });
+        }
+
+        [HttpGet("GetLeaderboard")]
+        public async Task<IActionResult> GetLeaderboard(int top = 10)
+        {
+            var leaderboard = await _context.Leaderboards
+                .OrderByDescending(lb => lb.MaxScore)
+                .Take(top)
+                .Select(lb => new
+                {
+                    lb.UserName,
+                    lb.MaxScore
+                })
+                .ToListAsync();
+
+            return Ok(leaderboard);
+        }
+    }
+}

SwipeWords/Data/Leaderboard.cs

@@ -3,14 +3,12 @@
 
 namespace SwipeWords.Data;
 
-public record Leaderboard
+public class Leaderboard
 {
-    [Key] public int Id { get; set; }
+    [Key] public string UserName { get; set; }
 
     public int MaxScore { get; set; }
-    public int RankPosition { get; set; }
 
-    [ForeignKey(nameof(UserId))] public int UserId { get; set; }
-
-    public User User { get; set; }
+    [ForeignKey(nameof(UserId))] public Guid UserId { get; set; }
+
 }