rewrite number whatever to .net and blazor.

Pages/Subscribe.cshtml.cs

@@ -0,0 +1,76 @@
+using System.Text.Json;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+using landing.Data;
+using landing.Models;
+using landing.Services;
+
+namespace landing.Pages;
+
+[IgnoreAntiforgeryToken]
+public class SubscribeModel : PageModel
+{
+    private readonly AppDbContext _db;
+    private readonly EmailService _email;
+    private readonly ILogger<SubscribeModel> _logger;
+
+    public SubscribeModel(AppDbContext db, EmailService email, ILogger<SubscribeModel> logger)
+    {
+        _db = db;
+        _email = email;
+        _logger = logger;
+    }
+
+    public IActionResult OnGet() => NotFound();
+
+    public async Task<IActionResult> OnPostAsync()
+    {
+        string? emailAddress = null;
+
+        // Try to read JSON body
+        try
+        {
+            using var reader = new StreamReader(Request.Body);
+            var body = await reader.ReadToEndAsync();
+            var json = JsonSerializer.Deserialize<JsonElement>(body);
+            emailAddress = json.GetProperty("email").GetString();
+        }
+        catch
+        {
+            return BadRequest(new { error = "Invalid request" });
+        }
+
+        if (string.IsNullOrWhiteSpace(emailAddress))
+        {
+            return BadRequest(new { error = "Email is required" });
+        }
+
+        try
+        {
+            _db.Subscribers.Add(new Subscriber { Email = emailAddress });
+            await _db.SaveChangesAsync();
+        }
+        catch
+        {
+            return BadRequest(new { error = "Email already exists" });
+        }
+
+        // Build unsubscribe link
+        var scheme = Request.Scheme;
+        var host = Request.Host.Value;
+        var unsubscribeLink = $"{scheme}://{host}/unsubscribe?email={emailAddress}";
+
+        try
+        {
+            await _email.SendConfirmationEmailAsync(emailAddress, unsubscribeLink);
+            _logger.LogInformation("Confirmation email sent to {Email}", emailAddress);
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError("Failed to send confirmation email to {Email}: {Error}", emailAddress, ex.Message);
+        }
+
+        Response.StatusCode = 201;
+        return new JsonResult(new { message = "Email has been added" });
+    }
+}