version-0.1 (#1)

Squash and merge of version-0.1

Co-authored-by: James Wampler <james@wamp.dev>
Co-committed-by: James Wampler <james@wamp.dev>

src/api/MicCheck.Api/Users/UserService.cs

@@ -0,0 +1,44 @@
+using MicCheck.Api.Data;
+using Microsoft.AspNetCore.Identity;
+using Microsoft.EntityFrameworkCore;
+
+namespace MicCheck.Api.Users;
+
+public class UserService(MicCheckDbContext db, IPasswordHasher<User> passwordHasher)
+{
+    public async Task<User?> FindByIdAsync(int userId, CancellationToken ct = default) =>
+        await db.Users.FirstOrDefaultAsync(u => u.Id == userId && u.IsActive, ct);
+
+    public async Task<(User? User, bool EmailConflict)> UpdateProfileAsync(
+        int userId, string firstName, string lastName, string email, CancellationToken ct = default)
+    {
+        var user = await db.Users.FirstOrDefaultAsync(u => u.Id == userId && u.IsActive, ct);
+        if (user is null) return (null, false);
+
+        if (!string.Equals(user.Email, email, StringComparison.OrdinalIgnoreCase))
+        {
+            var emailTaken = await db.Users.AnyAsync(u => u.Email == email && u.Id != userId, ct);
+            if (emailTaken) return (null, true);
+        }
+
+        user.FirstName = firstName;
+        user.LastName = lastName;
+        user.Email = email;
+        await db.SaveChangesAsync(ct);
+        return (user, false);
+    }
+
+    public async Task<bool> ChangePasswordAsync(
+        int userId, string currentPassword, string newPassword, CancellationToken ct = default)
+    {
+        var user = await db.Users.FirstOrDefaultAsync(u => u.Id == userId && u.IsActive, ct);
+        if (user is null) return false;
+
+        var result = passwordHasher.VerifyHashedPassword(user, user.PasswordHash, currentPassword);
+        if (result == PasswordVerificationResult.Failed) return false;
+
+        user.PasswordHash = passwordHasher.HashPassword(user, newPassword);
+        await db.SaveChangesAsync(ct);
+        return true;
+    }
+}