AfRApay/AfRApay.Web/Pages/Index.cshtml.cs

using System.Data;
using System.Net;
using AfRApay.Web.Backend;
using LinqToDB;
using Microsoft.AspNetCore.Mvc.RazorPages;

namespace AfRApay.Web.Pages;

public class IndexModel : PageModel {
	public void OnGet() { }

	public void OnPost() {
		using var db = new Database.DbConn();
		if (Request.Form["action"] == "transaction" && Request.Form.ContainsKey("userId") && Request.Form.ContainsKey("amount")) {
			var userId = int.Parse(Request.Form["userId"].ToString());
			var amount = int.Parse(Request.Form["amount"].ToString());
			var user   = db.Users.First(p => p.Id == userId);
			switch (user.Balance + amount) {
				case < -9999:
					Response.Redirect("/ErrorRedirect?message=" + WebUtility.UrlEncode("Balance too low!"));
					return;
				case > 99999:
					Response.Redirect("/ErrorRedirect?message=" + WebUtility.UrlEncode("Balance too high!"));
					return;
			}

			user.Balance += amount;
			db.Update(user);

			Response.Redirect($"/#{user.Nickname}");
		}
		else {
			Response.Redirect("/");
			return;
		}
	}
}