<?php

if (isset($_POST['signup-submit'])) {
  require 'dbh.inc.php';
  $username=$_POST['uid'];
  $email=$_POST['mail'];
  $password=$_POST['pwd'];
  $passwordRepeat=$_POST['pwd-repeat'];
  if (empty($username) || empty($email) || empty($password) || empty($passwordRepeat) ) {
    header("Location: ../signup.php?error=emptyfields&uid=".$username."&mail=".$email);
    exit();
  }
  else if (!filter_var($email, FILTER_VALIDATE_EMAIL) && !preg_match("/^[a-zA-Z0-9]*$/", $username )){
    header("Location: ../signup.php?error=invalidmailuid");
    exit();
  }
  else if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
    header("Location: ../signup.php?error=invalidmail&uid=".$username);
    exit();
  }
  else if (!preg_match("/^[a-zA-Z0-9]*$/", $username)) {
    header("Location: ../signup.php?error=invaliduid&mail=".$email);
    exit();
  }
  else if ($password !== $passwordRepeat){
    header("Location: ../signup.php?error=passwordcheck&uid=".$username."&mail=".$email);
    exit();
  }
  else {
    $sql = "SELECT uidUsers FROM users WHERE uidUsers=?";
    $stmt = mysqli_stmt_init($conn);
    if (!mysqli_stmt_prepare($stmt, $sql)) {
      header("Location: ../signup.php?error=sqlerror");
      exit();
    }
  }
  else {
      mysqli_stmt_bind_param($stmt, "s", $username);
      mysqli_stmt_execute($stmt);
      mysqli_stmt_store_result($stmt);
      $resultCheck = mysqli_stmt_num_rows($stmt);
      if ($resultCheck > 0 ) {
        header("Location: ../signup.php?error=usertaken&mail=".$email);
        exit();
      }
    }
    else {
      $sql = "INSERT INTO users (uidUsers, emailUsers, pwdUsers) VALUES (?, ?, ?) ";
      $stmt =  mysqli_stmt_init($conn);
      if (!mysqli_stmt_prepare($stmt, $sql)) {
        header("Location: ../signup.php?error=sqlerror");
        exit();
      }
      else {
        $hashedPwd = password_hash($password, PASSWORD_DEFAULT);
        mysqli_stmt_bind_param($stmt, "sss", $username, $email, $hashedPwd);
        mysqli_stmt_execute($stmt);
        header("Location: ../signup.php?signup=success");
        exit();
      }
    }
  }
  mysqli_stmt_close($stmt);
  mysqli_close($conn);
}

else {
  header("Location: ../signup.php");
  exit();
}