<?php
// Initialize the session
session_start();
if (isset($_GET["brand"])) {
    $brand = $_GET["brand"];
} else {
    $brand = $_SESSION["login"];
}
if (!isset($brand)) {
    header("location: ./");
    exit;
}


// Check if the user is already logged in, if yes then redirect him to welcome page
if(isset($_SESSION[$brand]) && $_SESSION[$brand] === true){
    header("location: ./generate/" .$brand. ".php");
    exit;
}

// Include config file
require_once "config.php";

// Define variables and initialize with empty values
$username = $password = "";
$username_err = $password_err = "";

// Processing form data when form is submitted
if($_SERVER["REQUEST_METHOD"] == "POST"){

    // Check if username is empty
    if(empty(trim($_POST["username"]))){
        $username_err = "Please enter username.";
    } else{
        $username = trim($_POST["username"]);
    }

    // Check if password is empty
    if(empty(trim($_POST["password"]))){
        $password_err = "Please enter your password.";
    } else{
        $password = trim($_POST["password"]);
    }

    // Validate credentials
    if(empty($username_err) && empty($password_err)){
        // Prepare a select statement
        $sql = "SELECT id, username, password, expires_at FROM $brand WHERE username = ?";

        if($stmt = mysqli_prepare($link, $sql)){
            // Bind variables to the prepared statement as parameters
            mysqli_stmt_bind_param($stmt, "s", $param_username);

            // Set parameters
            $param_username = $username;

            // Attempt to execute the prepared statement
            if(mysqli_stmt_execute($stmt)){
                // Store result
                mysqli_stmt_store_result($stmt);

                // Check if username exists, if yes then verify password
                if(mysqli_stmt_num_rows($stmt) == 1){
                    // Bind result variables
                    mysqli_stmt_bind_result($stmt, $id, $username, $hashed_password, $expires_at);
                    if(mysqli_stmt_fetch($stmt)){
                        if(password_verify($password, $hashed_password)){
                            // Password is correct, so start a new session
                            session_start();

                            // Store data in session variables
                            $_SESSION[$brand] = true;
                            $_SESSION["id"] = $id;
                            $_SESSION["username"] = $username;
                            $_SESSION[$brand."_expires_at"] = $expires_at;

                            // Redirect user to welcome page
                            header("location: ./generate/" .$brand. ".php?kind=unlimited&brand=" .$brand);
                        } else{
                            // Display an error message if password is not valid
                            $password_err = "The password you entered was not valid.";
                        }
                    }
                } else{
                    // Display an error message if username doesn't exist
                    $username_err = "No account found with that username.";
                }
            } else{
                echo "Oops! Something went wrong. Please try again later.";
            }
        }

        // Close statement
        mysqli_stmt_close($stmt);
    }

    // Close connection
    mysqli_close($link);
}
require_once __DIR__.'/../includes/header.php';
?>
<style>
.card {
  max-width: 400px;
	margin: 35px auto;
}
</style>
<div class="card">
  <!--Card content-->
  <div class="card-body px-lg-5 pt-0">
	<center><div class="avatar mx-auto" style="text-allign:center;">
<img src="../../../images/logo/<?php echo $brand?>.jpg" class="rounded-circle z-depth-1"
          alt="<?php echo $brand?>">
  </div></center>
    <!-- Form -->
    <form class="text-center"  method="POST">

      <!-- Email -->
      <div class="md-form <?php echo (!empty($username_err)) ? 'has-error' : ''; ?>">
        <input type="text" id="username" class="form-control"  name="username" placeholder="Username" autofocus="" value="<?php echo $username; ?>">
          <label for="username">Username</label>
          <span class="help-block"><?php echo $username_err; ?></span>
      </div>

      <!-- Password -->
      <div class="md-form <?php echo (!empty($password_err)) ? 'has-error' : ''; ?>">
        <input type="password" id="password" name="password" class="form-control">
        <label for="password">Password</label>
          <span class="help-block"><?php echo $password_err; ?></span>
      </div>



      <!-- Sign in button -->
      <button class="btn btn-outline-info btn-rounded btn-block my-4 waves-effect z-depth-0" type="submit">Sign in</button>

      <!-- Register -->
      <p>Not a member?
        <a href="register.php">Register</a>
      </p>

    </form>
    <!-- Form -->

  </div>

</div>
<?php require_once __DIR__.'/../includes/footer.php'; ?>