<?php
    require("header.php");
    $errors = array();

    $form_valid = true;

    if ($_SERVER["REQUEST_METHOD"] == "POST" && isset($_POST["btnLogin"]))
    {
        $login = $_POST['txtLogin'];
        $password = $_POST['txtPassword'];
        if (empty($login))
        {
            $form_valid = false;
            $errors["login"] = "Please enter login.";
        }
        if (empty($password))
        {
            $form_valid = false;
            $errors["password"] = "Please enter password.";
        }

        if ($form_valid)
        {
            $login_result = $authentication->doLogin($login, $password);
            if (!$login_result)
            {
                $errors["wrong_login"] = "Invalid login or password.";
            }
            else
            {
                header("Location: content.php");
                die();
            }
        }
        else
        {
            $authentication->logoff();
        }
    }
?>
<?php
    if (count($errors) > 0)
    {
?>
<ul style="color: #f00">
<?php
        foreach ($errors as $key => $value)
        {
            echo "<li>".$value."</li>";
        }
?>
</ul>
<?php
    }
?>
<div class="row">
    <div class="col-md-6">
      <div class="row justify-content-center align-items-center h-100">
          <form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="POST" class="needs-validation" novalidate>
                  <div class="form-group">
                      <label for="txtLogin">Login</label>
                      <input type="text" class="form-control" id="txtLogin" name="txtLogin" required />
                      <div class="invalid-feedback">
                          Please enter login.
                      </div>
                  </div>
                  <div class="form-group">
                      <label for="txtPassword">Password</label>
                      <input type="password" class="form-control" id="txtPassword" name="txtPassword" required />
                      <div class="invalid-feedback">
                          Please enter password.
                      </div>
                  </div>
                  <button type="submit" name="btnLogin" class="btn btn-primary">Login</button>
          </form>
      </div>
    </div>
    <div class="col-md-4">
      <p>
        <strong>Login:</strong> user1<br/>
        <strong>Password:</strong> a
      </p>
      <p>
        <strong>Login:</strong> user2<br/>
        <strong>Password:</strong> a
      </p>
    </div>
</div>
<?php
    require("footer.php");
?>
<script type="text/javascript">
(function() {
  'use strict';
  window.addEventListener('load', function() {
    var forms = document.getElementsByClassName('needs-validation');
    var validation = Array.prototype.filter.call(forms, function(form) {
      form.addEventListener('submit', function(event) {
        if (form.checkValidity() === false) {
          event.preventDefault();
          event.stopPropagation();
        }
        form.classList.add('was-validated');
      }, false);
    });
  }, false);
})();
</script>

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